#linuxcnc Logs

Oct 20 2017

#linuxcnc Calendar

01:36 AM RyanS: urgghh, hypertherm consumables are priced high enough to make the baby jesus cry
01:43 AM RyanS: maybe i can mover to germany on mum's Dutch passport as a refugee fleeing from ludicrously high prices of the Australian industrial market
01:45 AM gloops_: i dont think youd need a passport or anything, just walk in, you can do whatever you want
01:51 AM CaptHindsight: RyanS: us it true that it's just like Road Warrior there, only with fast food and gas stations?
01:51 AM MarcelineVQ: it's like road warrior except with rabbits
01:51 AM MarcelineVQ: it's like watership warrior
01:52 AM RyanS: whats road warrior
01:52 AM MarcelineVQ: oh you :>
01:53 AM CaptHindsight: I thought gloops was referring to you being in Australia
01:54 AM gloops_: 2 deep groove bearings - hollow shaft with flange bolted to ballnut, timing pulley on shaft = rotating ballnut
01:54 AM IchGucksLive: hi
01:54 AM gloops_: angular contact bearings = 2 expensive
01:54 AM RyanS: Australia is like Europe except with better coffee, a more stable economy and fewer fascist parties
01:54 AM IchGucksLive: gloops_: use UCP
01:54 AM IchGucksLive: its so cheep
01:55 AM gloops_: UCP?
01:55 AM IchGucksLive: http://www.ebay.de/itm/2-Stuck-UCP204-Stehlagergehause-Lagerbock-UCP-204-Stehlager-20-mm-Welle-/291638594412
01:56 AM RyanS: but less interesting buildings and longer working hours
01:56 AM IchGucksLive: gloops_: this works so smooth and no endwork to the screws
01:56 AM gloops_: https://www.youtube.com/watch?v=mSNFD9zx7fE
01:57 AM MarcelineVQ: gloops_: she is loud though
01:57 AM gloops_: ahh yes, was thinking of spinning the nut
01:57 AM gloops_: Marcel thats motor noise i think - not crunchy bearings
01:58 AM MarcelineVQ: is it? sounded like the balls to me, but I don't know much about that stuff ehe
01:58 AM RyanS: what's the evil scraping
01:58 AM IchGucksLive: gloops_: what is the spindle length
01:58 AM gloops_: 1350
01:58 AM IchGucksLive: RyanS: does the mashine form
01:59 AM IchGucksLive: gloops_: no need on that
01:59 AM IchGucksLive: gloops_: its the max if it is 2005
01:59 AM gloops_: i probably wont do it anyway its just a bee thats in my bonnet, once i start drawing sketches of hair brained ideas it takes over my life
01:59 AM gloops_: 1605 - top speed 200ipm, probably more like 150
02:00 AM gloops_: which is enough really, but it could be doubled
02:00 AM IchGucksLive: 1605 is not to be free that long
02:00 AM RyanS: how is the pulley connected to the nut?
02:00 AM IchGucksLive: RyanS: screw
02:00 AM IchGucksLive: on high force you need form
02:01 AM gloops_: the nut is connected to a hollow shaft with a pulley on it
02:01 AM IchGucksLive: keyway
02:01 AM gloops_: the hollow shaft is in 2 thrust bearings
02:01 AM gloops_: it is diyable
02:01 AM RyanS: ok
02:01 AM IchGucksLive: gloops_: with the spinning nut you can go direct UCP
02:02 AM IchGucksLive: the nut has 40mm and the UCP will fit this
02:02 AM RyanS: ucp?
02:02 AM RyanS: oh
02:03 AM RyanS: pillow block
02:03 AM IchGucksLive: ucp208 will fot the ballscrew
02:03 AM gloops_: you thinking of having bearings on the body of the ballnut Ichs?
02:03 AM IchGucksLive: ballscrew nut
02:03 AM IchGucksLive: yes
02:04 AM gloops_: i was going to bolt a hollow shaft to the nut flange
02:04 AM IchGucksLive: and the pullex bmounted roght next
02:04 AM gloops_: how do you keep the nut in the bearings?
02:04 AM IchGucksLive: and the pulley mounted direct to the nut
02:05 AM IchGucksLive: gloops_: look at the UCP
02:05 AM IchGucksLive: it has a Screw and the Pulley tightens it
02:05 AM gloops_: ok...thats working so far
02:06 AM IchGucksLive: Axial Pulley,Rotation fix with UCP screw
02:06 AM gloops_: but the ucp is not a thrust bearing, might be friction problems
02:06 AM IchGucksLive: i got now 8maschines buiild that way
02:07 AM IchGucksLive: http://heimwerkermarkt-tretter.de/holzcnc.jpg
02:07 AM gloops_: you kept that little light under your bushel haha
02:07 AM IchGucksLive: this is the mashine design for that setup
02:07 AM IchGucksLive: klick on zoom
02:07 AM IchGucksLive: ans look the UCP
02:08 AM RyanS: if i want to occasionally rout timber with a plasma table , wouldn't mod 1.0 rack and pinion have low backlash compared to mod 2.0, for example ?
02:08 AM gloops_: that is turning the nut right Ichs? not the screw
02:08 AM IchGucksLive: BEST to USE Metric T
02:09 AM IchGucksLive: RyanS: T5 gives you always 3teeth in force
02:09 AM MarcelineVQ: do you make machines to sell IchGucksLive? I'm not looking to buy, just curious
02:09 AM IchGucksLive: T10 gives you a more Force
02:10 AM RyanS: mod 1 is metric
02:10 AM IchGucksLive: MarcelineVQ: NO only constructing and HELP for EDUCATION
02:10 AM MarcelineVQ: sounds pretty fun
02:10 AM archivist: those bearing are somewhat agricultural
02:11 AM RyanS: T5 is a timing belt form
02:11 AM MarcelineVQ: thinking of using them for your cement mixer archivist?
02:11 AM gloops_: if that works, would save some machining
02:11 AM IchGucksLive: RyanS: http://www.maedler.de/product/1643/stirnzahnraeder-zahnstangen-innenzahnkraenze-sperrraeder
02:11 AM IchGucksLive: RyanS: this is metric http://www.maedler.de/product/1643/1618/2130/zahnstangen-stahl-mit-metrischer-teilung-5mm-und-10mm
02:12 AM archivist: MarcelineVQ, for farm use they are ok but not accuracy
02:12 AM IchGucksLive: RyanS: you can go up to whatever yu want
02:12 AM gloops_: i cant work out how much thrust the bearings would take, is the ballnut taking the load and dragging the bearings through, or is it all pushing on that bearing mount
02:12 AM IchGucksLive: my max on the Rack pinion is 10meters RyanS
02:13 AM archivist: gloops_, unless you do something it is all on the grub screw
02:13 AM IchGucksLive: gloops_: beleve me a Bearing 40mm will take more then your tool
02:14 AM gloops_: would need bearings with 30mm inner
02:15 AM gloops_: 2 to each nut
02:15 AM RyanS: IchGucksLive i thought metric gears are specified in 'module' http://www.metrication.com/engineering/gears.html
02:16 AM archivist: they are, but also rack is defined in pitch as well
02:18 AM IchGucksLive: RyanS: as i said is tis a easy CALC Stepeprs : Halfstepping 400Steps/rev Gearing 30:1 = 400*30 = 12000Steps per 1Rot on OUT
02:18 AM IchGucksLive: MEATS == RackPinion T10 =10mmP and Z12 12 teeth on D0=m*z =120mm per 1Rotation
02:18 AM IchGucksLive: THIS goes 12000Steps / 120mm = 100steps per mm = 0,01mm/step
02:19 AM gloops_: http://www.ebay.co.uk/itm/SBPF206-SLFE30-30mm-Round-3-Bolt-Pressed-Steel-Bearing-SBPF-SLFE/201284770113?
02:19 AM IchGucksLive: BENEFIT at Halfstepping full Torque MAX speed
02:20 AM IchGucksLive: morning Deejay
02:20 AM Deejay: moin
02:20 AM IchGucksLive: gloops_: why not using the sqare one
02:21 AM gloops_: archivist what happens to normal bearings with thrust load?
02:21 AM gloops_: Ichs yeah the square is cheaper, i thought the round mounted to a plate with the motor on the same plate would be more rigig
02:21 AM gloops_: rigid
02:21 AM archivist: you machine the shaft or have some proper clamp
02:21 AM IchGucksLive: gloops_: if you look on the picture there is a preoad ring
02:22 AM IchGucksLive: preload
02:22 AM IchGucksLive: bevore the UCP
02:22 AM IchGucksLive: Deejay: rain outside
02:22 AM Deejay: here too
02:23 AM RyanS: IchGucksLive yeah , but larger steppers and driver with 5:1 belts are cheaper than $400 30:1 gearboxes
02:23 AM MarcelineVQ: interesting, we've had crazy storming rain here the last two days as well
02:23 AM gloops_: well, instinct tells me this bearing wouldnt last long, but you seem to be proving otherwise Ichs if its running on your machine
02:23 AM archivist: gloops_, deep groove are designed for some end thrust
02:23 AM IchGucksLive: RyanS: the NKS 30:1 are 80 USD
02:24 AM gloops_: archivist yes thats the compromise i was going to use
02:24 AM gloops_: might be able to get deep groove pillows
02:25 AM RyanS: NSK?
02:25 AM archivist: pillows are for badly constructed stuff
02:26 AM IchGucksLive: RyanS: the HRV ones
02:27 AM IchGucksLive: RyanS: the HMRV will fit direct the steppers Nema34
02:28 AM RyanS: whats an acceptable arc-min backlash for this application ?
02:28 AM IchGucksLive: i got 0,04 on all 8 im using
02:29 AM IchGucksLive: but they are all from one serie
02:30 AM gloops_: the benefit of bearings on the body nut is that none of the screw is lost, but i didnt want to mount anything there, i suppose it is strong enough though
02:30 AM IchGucksLive: there are also HRM S03 versions
02:30 AM IchGucksLive: they are smaller 60x60mm
02:30 AM IchGucksLive: but that dident fit my T10Z12 so i dident used them
02:31 AM IchGucksLive: RyanS: the 5:1 will not selfclamp so ther is a Bend likly
02:32 AM RyanS: 0.04 arc-min?
02:32 AM IchGucksLive: i run the plasmas on that value and it gives mee less then 0,1mm onj Dials in 1shift
02:33 AM IchGucksLive: and at the mesurment i dont trust the dial at that speed
02:33 AM IchGucksLive: the dials where 8hr on the othere end of the mashine
02:34 AM IchGucksLive: dials where screwd halrd
02:35 AM IchGucksLive: the mashine worked out 12 sheeds 2mx1m
02:35 AM IchGucksLive: and then commanded on G53 to the dials
02:35 AM IchGucksLive: readings where as nonexpected realy precice
02:36 AM IchGucksLive: I need to say that mashine costs are 18000Euro
02:36 AM IchGucksLive: so it is real plasma
02:37 AM IchGucksLive: I NEED to SAY always INVEST in Mechanics not in Electronics FIRST
02:37 AM IchGucksLive: I NEED to SAY always INVEST in Mechanics FIRST then in Electronics second
02:38 AM IchGucksLive: Your cloosed loop steppers can only be as good as the mechanics
02:39 AM RyanS: the planetary gearboxes have 0.04 arc-min backlash ? the smallest i can see is 1-3
02:39 AM IchGucksLive: RyanS: MY Backlash in INI is 0,04
02:40 AM RyanS: ini?
02:40 AM IchGucksLive: the LCNC setup file
02:40 AM archivist: 0 backlash=ballscrew or special gears/nuts on any drive
02:41 AM IchGucksLive: archivist: agree
02:41 AM IchGucksLive: Mechanics first
02:42 AM IchGucksLive: ok im off later
02:53 AM RyanS: who manufactures HMRV gearboxes? no luck with google
02:53 AM gloops_: do not use one motor and driveshaft
02:54 AM RyanS: yeah, thatd have racking issues
02:55 AM archivist: wider spacing of the carriages to stop that
02:56 AM archivist: often the gantry carriages are far too close to maximise travel
02:56 AM archivist: another compromise :)
02:58 AM RyanS: these are interesting https://www.damencnc.com/products/mechanical-components/rack-pinion/r-p-drive-antibacklash-diy-includes-gears15t/_404_w_74_554_GB_1 too expensive though
02:59 AM archivist: while there is anit backlash gears to rack it is still in the gearbox
03:00 AM CaptHindsight: twin helical gear racks
03:00 AM CaptHindsight: http://2.bp.blogspot.com/-Wa7FKnf-OVY/TjFe5zqOlZI/AAAAAAAAADY/oBgMe5pQpRQ/s1600/11.png
03:00 AM archivist: you can adjust spacing to adjust backlash
03:01 AM Valen: I wonder why they don't do anti backlash on acme screws with a second nut and some springs, I guess too much friction
03:02 AM RyanS: yeah, that would mean expensive gearbox for dual pinions
03:02 AM CaptHindsight: friction will depend on the spring pressure and the pitch of the screw and nut materials
03:03 AM CaptHindsight: you could use two servos and control the lash and direction in HAL
03:03 AM CaptHindsight: this has come up a few times before
03:04 AM archivist: RyanS, I dont understand your wanting steppers when you also wand speed
03:04 AM CaptHindsight: http://nptel.ac.in/courses/112106137/pdf/2_11.pdf
03:07 AM CaptHindsight: https://en.wikipedia.org/wiki/Herringbone_gear
03:14 AM archivist: with acme screws two nuts with adjustable spacing without springs can be made but it does wear
03:15 AM RyanS: archivist i've heard plasma tables with steppers do 300 mm/s.. i'd be happy with 220mm/s, but the fastest my plasma needs to go is 135mm/s
03:15 AM archivist: my milling machine has that made about 1942
03:16 AM archivist: as steppers get bigger they also are slower
03:17 AM RyanS: ok, so smaller steppers with gear reduction is better?
03:18 AM archivist: gear reduction adds backlash
03:19 AM archivist: gearbox adds resolution and torque but your stepper motor still has a speed limit
03:21 AM RyanS: that's why most diy plasma uses 5:1 timing belt reduction (they have preload, or so i read) , not 30:1 planetary
03:23 AM archivist: so many compromises, occasional milling probably as well as plasma is probably pushing it a bit
03:26 AM RyanS: yeah , i can't see a reason why plasma needs much torque , so just use microstepping & 5:1 belt reduction
03:27 AM archivist: you want torque to accelerate
03:35 AM RyanS: not sure how much acceleration plasma needs--i've read 0.1g or 980 mm/s^2
03:37 AM RyanS: no idea how you can specify a unit of time squared but maths was never my strength
03:37 AM gloops_: the acceleration is key
03:37 AM archivist: mass/weight of gantry and then you can calculate forces
03:38 AM gloops_: 10m/min is theoretical, you have to consider your cutting might be in lines of 50mm - nowhere near enough time to reach 10m/min
03:38 AM gloops_: youll be lucky to cut anwhere near
03:38 AM archivist: working back through a gear train is a pain
03:39 AM gloops_: the cut is changing direction all the time, you cannot accelrate in that distance
03:40 AM gloops_: not with stepper motors anyway, you want servos
03:40 AM RyanS: that was for a umm 40kg gantry that 980 mm/s^2 was mentioned
04:03 AM RyanS: i cant speak for the theory but this uses 4 Nm steppers and 200mm/s (they claim anyhow )
04:04 AM RyanS: https://youtu.be/hTr308zGH-o?t=338
04:04 AM RyanS: looks ok anyway
04:49 AM jthornton: morning
04:50 AM XXCoder: hey
04:50 AM XXCoder: apparently this is what denmark did when you found out they hve a problem. https://youtu.be/B00grl3K01g
04:50 AM XXCoder: english captioned
08:16 AM sync: RyanS: that is because it modifies the value with the square of the time, double the time quadruples the value
08:48 AM jelly-home is now known as jelly
09:25 AM Simonious: CaptHindsight: hasn't been listed so far, considering it, central Minnesota
11:52 AM IchGucksLive: hi from germany
12:13 PM Tom_itx: busy day here i see
12:25 PM Loetmichel: man what a day... decided to do the rust ont he hood of the convertible... what i saw after grinding was baaad: http://www.cyrom.org/palbum/main.php?g2_itemId=16848&g2_imageViewsIndex=1 <- you can poke thru there to the inside :-( so i decided to temporarily fix it with some bondo and paint...
12:27 PM IchGucksLive: Q at all the 8Nm hybrds are realy cheep NOW at 60V 6A 3 sets lower then 500Euro
12:27 PM IchGucksLive: SO do i need the FULL 6A suplyes
12:27 PM IchGucksLive: so every stepper its own PSU
12:28 PM IchGucksLive: never worked on hybrid that torque quality
12:28 PM Loetmichel: ... so i put some primer on, then some grinding, bondo, more grinding, primer, more grinding, cosmos black metallic, clearcoat... and went tot he pressure washer on the way home from work. Only to notice that i badly oversprayed the primer on the left :-( -> http://www.cyrom.org/palbum/main.php?g2_itemId=16851&g2_imageViewsIndex=1
12:28 PM IchGucksLive: archivist: are you here ?
12:29 PM MarcelineVQ: Loetmichel: that's rough
12:29 PM IchGucksLive: Loetmichel: i did some cool foamcutting today
12:29 PM Loetmichel: at least the impact strip clips were in the mail today so i could clip the stip back on on the drivers side. -> http://www.cyrom.org/palbum/main.php?g2_itemId=16854&g2_imageViewsIndex=1
12:30 PM Loetmichel: will buy a new hood from ebay soon. they are only about 130€ in germany... until then that "fix" will hold.
12:32 PM Loetmichel: IchGucksLive: pics?
12:35 PM archivist: IchGucksLive, I am here
12:37 PM IchGucksLive: Loetmichel: http://pasteall.org/pic/index.php?id=119631
12:37 PM IchGucksLive: archivist do you know on the power question of the hybrid
12:38 PM Loetmichel: IchGucksLive: hotwire or CNC mill?
12:38 PM MarcelineVQ: IchGucksLive: are those stage props?
12:38 PM IchGucksLive: hotwire
12:39 PM archivist: when running the current drops anyway
12:39 PM IchGucksLive: MarcelineVQ: just for education showing objects
12:39 PM IchGucksLive: archivist: do you think i can clamp 2 of this to a 60V 7A as Habrid clames 6A
12:40 PM archivist: measure one see what the load is actually, and no if you want to keep the smoke in
12:41 PM IchGucksLive: ;-
12:41 PM IchGucksLive: so i need to put 5 PSU in case and sourcing on 480V
12:42 PM IchGucksLive: thats a bit Heavy for education stuff
12:42 PM IchGucksLive: they normaly dont like to use 12V
12:43 PM IchGucksLive: hi gloops
12:43 PM gloops: hi Ichs, whats the subject tonight?
12:44 PM IchGucksLive: gloops: http://pasteall.org/pic/index.php?id=119631
12:44 PM gloops: thats nice work
12:45 PM IchGucksLive: gloops: as always going as big as posible but staying on the floor
12:45 PM IchGucksLive: and keeping the wallet alive
12:45 PM James628: Hi All
12:45 PM IchGucksLive: gloops: did you use hybrid at this tyme closed lop
12:45 PM gloops: is that yours Ichs?
12:45 PM IchGucksLive: yes
12:45 PM IchGucksLive: hi James628
12:46 PM gloops: no i havent got hybrid motors just open loop, 3nm
12:46 PM IchGucksLive: James628: did you get eth to work
12:46 PM IchGucksLive: gloops: as here
12:46 PM Tom_itx: rainy day in germany?
12:46 PM Tom_itx: sunny day in US
12:46 PM gloops: ive got an old cast iron wood lathe im going to do that for a rotary axis, next time haha
12:46 PM IchGucksLive: but now the (nm Closed are at 500euros thats 80 euros above the stepepr
12:47 PM IchGucksLive: 8Nm
12:47 PM archivist: hybrid is a term used for many motors you probably are using them already
12:47 PM gloops: will do any job though?
12:47 PM gloops: when i build an 8x4 ill get the hybrids
12:47 PM IchGucksLive: the PSU 48V 9A is the Same as 60V 6A price so it gives the option
12:48 PM IchGucksLive: BUT it is not an option as hybrids are the Step to go
12:48 PM James628: I am sure I made some mistake but I don't know where. When I change any GPIO or LED of 7i92 I can see change in HAL monitor, but no change in actual HW pin. All pins/LEDs are high..
12:48 PM IchGucksLive: so system change
12:48 PM gloops: ive got a new 70v psu - no good atm my drivers cut out at 50v
12:49 PM Tom_itx: get the 302v
12:49 PM Tom_itx: 203v sry
12:49 PM IchGucksLive: Jamq did you load the new Firmware to the 7i92
12:49 PM James628: I am able to read the firmware status and flash the card with mesaflash,
12:50 PM Tom_itx: supply V on it is 80v
12:50 PM IchGucksLive: Tom_itx: the HSS86 takes 100V
12:50 PM James628: Linuxcnc starts properly, no errors
12:51 PM IchGucksLive: SO James628 what firmware did you flash
12:51 PM Tom_itx: and you can buy the driver and stepper for less than the gecko drive
12:51 PM IchGucksLive: and what is the BOB
12:51 PM Tom_itx: https://www.ebay.com/itm/US-Stock-HSS86-Hybrid-Driver-Servo-Motor-Nema34-8N-m-Closed-Loop-116mm-CNC-Kit-/302071676781
12:51 PM Tom_itx: that looks like a good deal
12:51 PM Tom_itx: servo?
12:52 PM James628: I flashed one anther fw, same. and same result with second 7i92 card too..
12:52 PM gloops: cant go wrong with those Tom
12:52 PM IchGucksLive: Tom_itx: thats it so i need for every SET a PSU in cabinett
12:53 PM IchGucksLive: Tom_itx: 3 of them below 500Euros
12:53 PM James628: IchGucksLive: 7i92_7i76x1D.bit
12:53 PM gloops: they are six amp im sure there were some 8 amp ones about the same price
12:53 PM IchGucksLive: but the Thing beond is getting BIG
12:53 PM Tom_itx: 36v
12:53 PM IchGucksLive: James628: why not the x2
12:53 PM IchGucksLive: Tom_itx: 60V
12:54 PM IchGucksLive: 5PSU 60V 7A
12:54 PM gloops: soon be able to build an industrial quality machine for the same as a diy job cost a couple years ago
12:54 PM Tom_itx: specs say 36v on the motor
12:54 PM IchGucksLive: so you need 480V supply as 2,2KW spindle
12:54 PM James628: IchGucksLive: is's enogh for now. I have 3 steppers and one encoder , all others could be GPIO
12:54 PM Tom_itx: gloops i like the sound of that
12:55 PM IchGucksLive: James628: ok so far is the 7i76 responding on gpio
12:55 PM IchGucksLive: James628: use a HALCMD to set pins
12:56 PM IchGucksLive: i woudt go via Relai to test
12:56 PM IchGucksLive: Easiest way is to setup cooling
12:56 PM James628: IchGucksLive: yes, when I change a GPIO/LED wih halcmd it changes the status in HAL meter, but not on real pin/LED
12:56 PM IchGucksLive: James628: AXIS or Gemoccapy
12:56 PM James628: axis
12:59 PM IchGucksLive: James628: you got Preempt-RT
01:00 PM IchGucksLive: The HM2_ETH driver only works in Preempt-RT
01:01 PM James628: IchGucksLive: I have it: 4.8.11-rt7
01:02 PM IchGucksLive: James628: can you post the output of uname -a
01:03 PM gloops: http://www.ebay.co.uk/itm/DE-SHIPPING-Wantai-CNC-kit-3Axis-Nema-34-Stepper-Motor-1232oz-in-5-6A-Driver-80V/152308752022?
01:03 PM gloops: 260 quid for motors drivers psus even the breakout board
01:03 PM James628: IchGucksLive: Linux mester-gep 4.8.11-rt7 #1 SMP PREEMPT RT Tue Mar 7 04:26:46 CET 2017 x86_64 x86_64 x86_64 GNU/Linux
01:04 PM gloops: hmmm...that is fantastic value
01:04 PM IchGucksLive: gloops: but it is not far away from the Closed loops
01:04 PM IchGucksLive: James628: thanks so it shoudt work
01:05 PM IchGucksLive: James628: the 24V are on the 7i76
01:06 PM James628: IchGucksLive: I have no attached other board to 7i92,
01:06 PM MarcelineVQ: where in the docs can I learn about Preempt-RT vs RTAI and such and what it means for a user of linuxcnc?
01:06 PM IchGucksLive: James628: then nothing can happen
01:07 PM IchGucksLive: MarcelineVQ: its only for the hardware relevant
01:07 PM IchGucksLive: James628: PLEASE FLASH a BOB
01:07 PM gloops: also got to remember these big motors guzzle juice, electric meter will be going round like a bees wings
01:07 PM James628: IchGucksLive: when I change the onboard LED of 7i92 it should change the status as well if I am right...
01:08 PM IchGucksLive: James628: 7i92_5ABOBx2D
01:08 PM IchGucksLive: this gives you 2 parports on the 7i92
01:08 PM James628: IchGucksLive: will do so, thanks
01:08 PM IchGucksLive: standard 12/5
01:09 PM IchGucksLive: then you can mesure
01:09 PM CaptHindsight: MarcelineVQ: how fast a response do you need?
01:09 PM IchGucksLive: but better to invest 6USD for a Real BOB to connect and mesere this
01:09 PM IchGucksLive: James628: where in the world are you
01:10 PM MarcelineVQ: CaptHindsight: I've no idea I just want to know what these terms mean really and where to find out more about them
01:10 PM James628: EU/Hungary
01:10 PM CaptHindsight: MarcelineVQ: on newer Intel hardware preempt_rt runs about as fast as RTAI
01:10 PM IchGucksLive: James628: im in germany
01:10 PM James628: IchGucksLive: I know :)
01:10 PM CaptHindsight: MarcelineVQ: oh, then just google RTAI and also preempt_rt
01:10 PM CaptHindsight: MarcelineVQ: there is not much in the LCNC docs about them
01:11 PM IchGucksLive: James628: Hungarian
01:11 PM James628: IchGucksLive: yes
01:11 PM MarcelineVQ: alright thank you for both leads, when you say newer how new do you have in mind?
01:11 PM IchGucksLive: What is your prefered EBAY location James628
01:12 PM CaptHindsight: MarcelineVQ: there are some people selling preempt_rt dev services, so some of the info is just marketing
01:12 PM CaptHindsight: MarcelineVQ: last few years
01:12 PM IchGucksLive: EBAY Dot XX
01:12 PM CaptHindsight: MarcelineVQ: run the latency test from the LiveCD to test your PC
01:13 PM IchGucksLive: James628: so i can look whats at your workplace in 2days
01:13 PM James628: IchGucksLive: mostly .com or uk, sometimes de,
01:14 PM James628: IchGucksLive: do you travel to HU? what you mean by workplace?
01:14 PM IchGucksLive: James628: ebay for this item next to you 262501735617
01:15 PM CaptHindsight: bleeding edge RTAI was getting <1uS latency jitter results from the test, it's probably not accurate and you'd have to use a scope to see what it really is
01:15 PM IchGucksLive: this is the Firmware 7i92_5ABOBx2D James628
01:15 PM MarcelineVQ: CaptHindsight: I've got a box set up with RTAI currently. latency is about 18k jitter last check
01:15 PM James628: what's this item?
01:15 PM CaptHindsight: MarcelineVQ: sounds like it's a good board for LCNC
01:16 PM MarcelineVQ: That's reassuring, I was reading the lcnc manual and it seemed like under 20 was fine
01:16 PM James628: IchGucksLive: I am preparing it..
01:17 PM IchGucksLive: James628: its the BOB and here is the VIDEO i made to setup https://www.youtube.com/watch?v=6hk09X_bQ_g
01:17 PM IchGucksLive: James628: this is also my channel
01:17 PM MarcelineVQ: it's a plain old dell optiplex 780, those optiplex were the only things I could find around here with parport
01:18 PM IchGucksLive: MarcelineVQ: why not using a 10 Dollar parport PCI
01:18 PM CaptHindsight: MarcelineVQ: sometimes users have to run preempt_rt since the branch of RTAI that the LCNC devs use doesn't have the newer hardware drivers in the kernels it supports
01:18 PM IchGucksLive: on a modern PC MarcelineVQ
01:19 PM Tom_itx: ok folks. it's Friday afternoon... drop what you're doing and take the rest of the day off
01:19 PM Tom_itx: tell your bos i said it was ok
01:19 PM IchGucksLive: Tom_itx: pentioners have no spare time
01:19 PM IchGucksLive: only workers
01:19 PM Tom_itx: true
01:20 PM MarcelineVQ: IchGucksLive: because they're not 10$ here hehe, and even a barebones modern pc wasn't going to be cheap either
01:20 PM IchGucksLive: MarcelineVQ: whaere are You
01:20 PM IchGucksLive: Bella italia ?
01:21 PM MarcelineVQ: on an island in western canada, where shipping tends to be 3x the cost of any single item you want to get
01:21 PM IchGucksLive: BAD
01:21 PM IchGucksLive: But shure the hell of Nature
01:22 PM CaptHindsight: hmm wonder what that means
01:22 PM IchGucksLive: CaptHindsight: living in paradise
01:26 PM CaptHindsight: would you move to an island with perfect weather, endless food and water but smells like feet 24/7?
01:27 PM MarcelineVQ: humans get used to smells very fast, a better devil's deal would be some sort of randomly reocurring event
01:27 PM jdh: prob wouldn't notice after a day
01:28 PM IchGucksLive: James628: get one with fast delivery on 10Euros
01:30 PM CaptHindsight: how about only be allowed to communicate with others using non sequiturs?
01:31 PM James628: IchGucksLive: Flashed the board with fw you recommended but the same behaviour, no changes in LEDs
01:31 PM MarcelineVQ: CaptHindsight: mr plow, that's my name, that name again is mr plow
01:31 PM IchGucksLive: CaptHindsight: im living in middleo f a large forest and the postman only comes with chanisaw in TRUCK once a week
01:31 PM CaptHindsight: and nouns are only allowed on Tuesdays
01:32 PM IchGucksLive: James628: did you check both connectors
01:32 PM roycroft: capthindsight: camel pudding enhances elbow vitality
01:33 PM James628: IchGucksLive: I havve my own BOB: http://lclab.io/wp-content/uploads/2015/12/P1020813.jpg
01:33 PM MarcelineVQ: film at eleven
01:33 PM CaptHindsight: MarcelineVQ: what are you building?
01:34 PM IchGucksLive: James628: that shoudt give you clear signals
01:35 PM CaptHindsight: roycroft: that sounds like a sales pitch for venture from a cloud provider
01:35 PM MarcelineVQ: CaptHindsight: I'd like to start with a simple gantry-style cnc to learn on and see where it goes, still deciding on what dimensions and style are suitable for my space
01:35 PM IchGucksLive: James628: so how did you check now with the new FW did you use a new config to setup
01:36 PM MarcelineVQ: I'd like to carve wood with it and aluminum, the latter mostly to make parts for the machine as alu is a bit expensive to use just to use it
01:36 PM CaptHindsight: https://imagebin.ca/v/2TYvESEACWSs fits nearly anywhere
01:36 PM IchGucksLive: sorry im off for today
01:36 PM IchGucksLive: Gn8
01:38 PM James628: IchGucksLive: I read back the pin with mesaflash and everything looks ok.
01:39 PM CaptHindsight: I'm thinking about mounting one on a bicycle for mobile milling
01:42 PM MarcelineVQ: CaptHindsight: yes that style of machine would be a good start
01:42 PM gloops: every back street engineer knows that the bicycle is the source for all the parts necessary to make absolutely anything
01:43 PM gloops: bikes and lawnmowers
01:43 PM CaptHindsight: this one could even make bicycle parts
01:43 PM FinboySlick: Y axis rigidity doesn't seem very good with something like that though. Then again, it's a gantry.
01:43 PM CaptHindsight: FinboySlick: it twists under the force of a human arm
01:44 PM gloops: need to make box section with the ply
01:44 PM FinboySlick: I learned early that flat plate isn't too great for machine design.
01:44 PM MarcelineVQ: could have rollers on the backside of the cross-member
01:44 PM CaptHindsight: but since it ships from China with 2-3mm of lash the twist is not a problem :)
01:44 PM MarcelineVQ: so you're sort of clamping to it to reduce twist
01:44 PM gloops: wood box section is almost as rigid as ally
01:45 PM CaptHindsight: https://ibin.co/3e0n3WS5yLHy.jpg they also use two steel linear bearings, you can see the top of one
01:47 PM CaptHindsight: FinboySlick: the two bearings provide more stiffness than the 1/2" aluminum plate
01:49 PM gloops: http://www.botlanta.org/converters/dale-calc/bending.html
01:50 PM Connor: Okay, so, questions about bridgeport placement and stuff.. How much room do I need around the table? Any suggestions on leveling and noise dampening? Was thinking of using hockey puck's under it (3 under each corner).. but, that's not going to let me level it.
01:51 PM CaptHindsight: here's the back of the gantry https://imagebin.ca/v/3eSgPsli69h4
01:51 PM gloops: same box - deflection ally - 0.017496 wood - 0.102917
01:52 PM gloops: you would of course be making a much larger hollow section with wood than if you used ally so no difference
01:54 PM CaptHindsight: Connor: I like at least a few feet, 30" min past the travel
01:54 PM gloops: the main advantages of aluminiu extrusions = easy to assemble, and linear straightness/flatness
01:55 PM CaptHindsight: well sort of flat and straight
01:55 PM gloops: pretty damnable straight - if your package wasnt at the bottom of a container full of gearboxes
01:56 PM gloops: wood is stronger than steel i daresay
01:57 PM SpeedEvil: Random misleading statements about strength of materials are stronger than either.
01:57 PM CaptHindsight: wood eye, would I
01:58 PM gloops: SpeedEvil checkout the Portland materials tests
01:58 PM CaptHindsight: what the best kinda bike to mount a mill on?
01:58 PM gloops: use that deflection calculator above
01:58 PM gloops: you cant beat wood
01:58 PM MarcelineVQ: CaptHindsight: surely a trike of some kind for the broad rear
01:59 PM SpeedEvil: gloops: wood is never stronger than steel. Wood of a similar weight, probably in a different arrangement than the steel may be stronger in some cases, it's really very far from a clear answer and depends on piles of things.
01:59 PM MarcelineVQ: If you want to bike while milling you'd want the stability, you could go for quad but passing off a trike as a bike is easier than a quad, trike at least rhyms.
01:59 PM CaptHindsight: whats heavier a pound of steel or a pound of wood?
02:00 PM MarcelineVQ: 'trick question, I've placed a magnet under the scale'
02:00 PM gloops: SpeedEvil wood is stronger than steel in a fire
02:00 PM SpeedEvil: gloops: No, it's not.
02:00 PM CaptHindsight: MarcelineVQ: going for maximum hipster impact
02:00 PM gloops: yes it is! haha
02:00 PM MarcelineVQ: CaptHindsight: be sure to brass plate everything
02:00 PM gloops: steel bends and sags in fire, wood does not
02:00 PM SpeedEvil: gloops: In some cases, for limited periods of time, with specific cases, that may be true.
02:01 PM * SpeedEvil looks at his steel fire.
02:01 PM * SpeedEvil looks at the steel fire grate.
02:01 PM gloops: try it - make a 7x5 box with 20mm plywood, you cannot twist it, drive the truck over it, youll see
02:02 PM SpeedEvil: And if you make a 7*5 box with 20mm steel, it'll be stronger.
02:03 PM CaptHindsight: we need a new version of Mythbusters
02:03 PM CaptHindsight: with actual scientists but questions from the average person on the street
02:04 PM FinboySlick: Honestly, we don't need anything now that we have Rick&Morty to make us realize that none of it matters ;)
02:04 PM gloops: you arent going to make a 4ft gantry with 7x5 steel box
02:04 PM CaptHindsight: whats stronger, stinky tofu, wooden box, tribal mentalities?
02:05 PM CaptHindsight: and the scientists fight it out in a ring wearing those balloon suits
02:07 PM SpeedEvil: CaptHindsight: It would, to be fair, be a more rational way for picking the Nobel prizes.
02:07 PM gloops: i would build with wood but tbh steel is quicker and easier for me and cheaper
02:08 PM gloops: i.e free
02:08 PM MarcelineVQ: do you live in a foundry? I wish steel was cheaper than wood here ehe
02:09 PM gloops: you can collect plenty of steel free if you keep your eyes open
02:09 PM SpeedEvil: +wood
02:09 PM gloops: anyway didnt mean to take this off topic
02:10 PM SpeedEvil: Grows on trees the stuff does.
02:10 PM CaptHindsight: https://www.youtube.com/watch?v=IUS64D9joXs combined with 20ft "pikes of facts"
02:10 PM gloops: SpeedEvil certainly, i have a pile of hardwood framing - i dont save plywood though
02:14 PM CaptHindsight: for cold days https://i.pinimg.com/736x/6d/78/93/6d7893d7785added590d4207479ab652--custom-radiator-hot-bikes.jpg
02:15 PM gloops: would have piped it to the handlebars
02:20 PM CaptHindsight: MarcelineVQ: is that why i get orders for shipment to Point Roberts?
02:21 PM CaptHindsight: lower shipping rates?
02:21 PM MarcelineVQ: quite possibly
02:22 PM MarcelineVQ: likely really, my grandpa keeps a p.o. box just over the boarder
02:23 PM roycroft: not only is it usually cheaper to ship that way, it's a lot faster
02:23 PM roycroft: canada post can take a week to deliver a letter from one part of vancouver to another part of vancouver
02:23 PM CaptHindsight: if it fits in your trunk vs a trailer when crossing the border
02:23 PM CaptHindsight: sounds like UK Parcel Farce
02:24 PM roycroft: but one can post a letter from vancouver to blaine, washington (border town) in a day, and vice versa
02:24 PM CaptHindsight: socialized mail care?
02:24 PM CaptHindsight: rather privatized
02:24 PM MarcelineVQ: privatized, actually canada post is better now than is has been in a long time, but it ain't good
02:24 PM roycroft: note that the us postal service is "socialized"
02:25 PM roycroft: and my experience is that the usps has improved dramatically over the past few years
02:25 PM CaptHindsight: anti-social mail service
02:26 PM CaptHindsight: roycroft: I agree until they lose an expensive parcel
02:26 PM CaptHindsight: then it's 3 hours of the run around
02:26 PM roycroft: i've had problems with the post office
02:26 PM CaptHindsight: 50 minute hold times on the phone
02:26 PM roycroft: but i've had more problems with damaged/lost/misdelivered parels from ups than usps
02:26 PM roycroft: parcels
02:27 PM roycroft: fedex are the only ones with a totally clean record in my experience
02:27 PM CaptHindsight: USPS within the USA has not lost one yet
02:27 PM CaptHindsight: USPS international is maybe 10% loss
02:27 PM CaptHindsight: but it's due to the foreign services
02:28 PM roycroft: the bottom line is: no company is perfect
02:28 PM roycroft: and that's not an inherent indictment of "capitalism" or "socialism" or any other "ism"
02:29 PM roycroft: it's an observation that humans are human
02:29 PM CaptHindsight: on high margin products we actually hope they lose them
02:29 PM CaptHindsight: 2x the profit
02:29 PM roycroft: sort of
02:29 PM roycroft: you get to profit twice in the short term
02:29 PM roycroft: but insurance rates increase in the long term
02:30 PM CaptHindsight: $10 for a $1200 product
02:30 PM roycroft: and when you factor in the cost of dealing with the customer and/or insurance company you don't profit 2x in the end
02:31 PM MarcelineVQ: when it comes to deliveries ups is more reliable than purolator here, purolator just leaves your shit at the door if you're not there. I'd like to take advantage of that poor practice for free stuff, saying you didn't get an item I mean, but I'd hate for the drivers to suffer for company policy
02:31 PM roycroft: not to mention the cost to your reputation, even though it's not your fault
02:31 PM CaptHindsight: with USPS it's just 2 long hold times and they call you back
02:31 PM CaptHindsight: then 2-3 weeks for a check
02:32 PM CaptHindsight: fedex, ups, dhl, 5 minute call, few days for a check or CC refund
02:32 PM CaptHindsight: but they rarely lose anything
02:33 PM roycroft: i've had more issues with damage than loss/misdelivery with ups
02:33 PM roycroft: but i have to say, ups are better than their naysayers claim they are
02:34 PM roycroft: almost all of the time, if something has been packed properly it arrives safely
02:34 PM CaptHindsight: they like dropping 20kg pails on the their sides
02:34 PM CaptHindsight: they are UN rated
02:35 PM CaptHindsight: those this end up arrows are just for fun
02:36 PM roycroft: what if the driver is australian and has a different concept of up?
02:36 PM MarcelineVQ: that explains everything
02:40 PM CaptHindsight: saw this in a movie once about Australia http://vignette2.wikia.nocookie.net/roadwarrior/images/6/63/Humungus_truck_1.jpg/revision/latest?cb=20130201035934
02:41 PM CaptHindsight: about delivering fuel or similar
02:43 PM roycroft: netflix have a series called "outback truckers"
02:43 PM roycroft: it's basically about truckers hauling fuel and/or livestrock all over australia, constantly getting stuck in the mud, and cussing a lot
02:44 PM CaptHindsight: History or Discovery channel? :)
02:44 PM roycroft: netflix
02:44 PM roycroft: probably not a netflix original series, but purchased from some australian outfit
02:44 PM roycroft: sometimes they haul mining equipment
02:44 PM djdelorie: when did netflix become a "channel" ? ;-)
02:45 PM CaptHindsight: https://www.netflix.com/title/80156047
02:45 PM roycroft: the most important recurring themes are "getting stuck" and "cussing"
02:45 PM * roycroft never said netflix is a channel
02:46 PM CaptHindsight: and this goes on for more than 5 minutes?
02:48 PM CaptHindsight: Jr High Cafeteria: tune in to see whats stuck to the undersides of tables and really in that sloppy surprise sandwich
02:49 PM CaptHindsight: Under the Bed Clean Team: Tune in each week to see what Dave and his team discover under beds while cleaning
02:50 PM CaptHindsight: Original Drive Thru Barber Shop:
02:51 PM roycroft: capthindsight: there are a lot of different places to to get stuck in the mud in australia
02:52 PM roycroft: and an endless number of ways to string expletives together
02:52 PM roycroft: so the show is not repetitious
02:52 PM CaptHindsight: lol
02:53 PM CaptHindsight: maybe MMA with Dive bars
02:54 PM CaptHindsight: Friday Dive Bar Fights
02:54 PM CaptHindsight: new bar each week
02:56 PM * gloops gets out his big one
02:56 PM gloops: 1 M30 die
02:59 PM gloops: this is 3.5 pitch though..
03:01 PM CaptHindsight: https://drillsandcutters.com/m30-x-3-5-2od-hss-round-die/
03:01 PM gloops: mine is presto - £150 plus at a guess
03:02 PM gloops: but not really suitable for the job in mind...
03:02 PM CaptHindsight: painful to break
03:03 PM gloops: painful to use by hand
03:10 PM gregcnc: no lathe available?
03:14 PM gloops: yes, tis rather old though
03:43 PM MarcelineVQ: roycroft: guilty of worse here, used to watch a show called goldrush that was just some guys mining gold, which is just scooping and washing mud, years of watching people washing mud. can't explain it
03:52 PM JT-Shop: can a 24v prox turn a contactor on
03:56 PM HighInBC: MarcelineVQ: hey, be fair to the show. There are a few bits of actual information spread over each season
03:56 PM HighInBC: at least 10 minutes worth of informative content every year
03:57 PM HighInBC: the rest is just grown men having tantrums though
03:59 PM MarcelineVQ: taught me all about trommels
04:01 PM pcw_mesa: JT-Shop: maybe, depends on the contactor coil rating and prox output current rating
04:02 PM pcw_mesa: in any case you need a flyback diode across the contactor coil
04:03 PM pcw_mesa: some of the EBAY cheapo ones are 300 mA:
04:03 PM pcw_mesa: https://www.ebay.com/itm/LJ18A3-8-Z-BX-3-Wire-DC-6-36V-NPN-NO-8mm-Inductive-Proximity-Sensor-Switch-/271664191307?hash=item3f4072974b:g:K1AAAOSwgYVZwjYJ
04:04 PM pcw_mesa: not sure if those are Chinese mA or not
04:05 PM MarcelineVQ: what is different about chinese marketing mA?
04:06 PM pcw_mesa: mA to set on fire
04:06 PM MarcelineVQ: ehe, what would be your adjustment for that? something like 30% lower?
04:07 PM JT-Shop: I just dug out some tiny AB relays to pull in the contactor
04:08 PM pcw_mesa: you still probably want the flyback diode
04:08 PM JT-Shop: http://literature.rockwellautomation.com/idc/groups/literature/documents/td/700-td552_-en-p.pdf
04:09 PM JT-Shop: is a flyback diode different than a normal one? I have some somewher4e
04:09 PM pcw_mesa: thats only 54 mA I'd drive it directly
04:09 PM JT-Shop: thanks
04:10 PM JT-Shop: the proxes are huge square long range proxes
04:10 PM pcw_mesa: any regular diode will do (1N4001 or Equiv)
04:11 PM JT-Shop: ok thanks
04:13 PM pcw_mesa: You could use a lower rated diode like a 1N4148 but they have really skinny leads
04:26 PM jthornton: I have 1N4148 diodes
04:27 PM jthornton: same size as a 1/4w resistor
04:28 PM pcw_mesa: they will do
04:30 PM JT-Shop: thanks
04:35 PM Deejay: gn8
04:39 PM CaptHindsight: frustrating lathe today, first it would not move into high gear, now when in low gear the handwheel pin won't stay out
04:40 PM CaptHindsight: why is there a spring on the pin that makes it move the wrong way?
04:42 PM gloops: if its anything like mine you have to lift the pin dead square on - otherwise it kinda drags the spring
04:42 PM CaptHindsight: lubing it didn't help
04:42 PM CaptHindsight: it needs friction to fight the spring
04:42 PM CaptHindsight: what a dumb design
04:42 PM gloops: what lathe is it?
04:43 PM CaptHindsight: Clausing 5914
04:43 PM gloops: looks like a nice lathe
04:45 PM CaptHindsight: it's ok
04:46 PM CaptHindsight: when i got it the hydraulic speed adjustment didn't work and then the single pahae motor burned out
04:46 PM CaptHindsight: now it's 3 phase and the speed adjuster works but now this
04:47 PM gloops: this stuff usually happens when you spent 30 minutes setting something up, just ready to run
04:50 PM CaptHindsight: http://vintagemachinery.org/pubs/detail.aspx?id=3407
05:03 PM gloops: pretty versatile machine, they all have their little character traits
05:04 PM MarcelineVQ: hehe, this china wiring diagram says land instead of ground, honest mistake
05:06 PM Tom_itx: lost translation from the original document they stole?
05:08 PM gloops: i have to smile at some of the messages on ebay
05:08 PM roycroft: i can see your electrons now shouting "LAND HO!"
05:08 PM roycroft: and getting all excited
05:08 PM CaptHindsight: all fixed
05:10 PM CaptHindsight: the hub for the back gear handwheel needs to be at just the right distance from the plate or the pin won't stay un/locked
05:11 PM CaptHindsight: hex key a rubber hammer saved the day
05:11 PM MarcelineVQ: I wonder, if they stole copied a euro diagram would it have said dirt
05:11 PM MarcelineVQ: those say earth instead of ground yeah?
05:12 PM CaptHindsight: land faults
05:12 PM roycroft: yes
05:13 PM roycroft: it's generally best when doing translations to hire a translator whose native tongue is the target language, not the source language
05:14 PM roycroft: but we know how often that happens
05:14 PM roycroft: somewhere between "never" and "unheard of"
05:14 PM Tom_itx: 3rd party translation :)
05:15 PM roycroft: i suspect many translations are done using internet websites these days
05:15 PM gloops: translation is easy enough 'Dear friend' = your item hasnt been posted yet
05:16 PM andypugh: Anyone near Scotland looking for a lathe? https://www.gumtree.com/p/lathes/holbrook-3-phase-lathe/1271349570
05:16 PM roycroft: "highest quality" = "we used 2psi higher air pressure to blow the casting sand away than our competitors"
05:17 PM andypugh: That’s a Holbrook Major, the bigger brother of my CNC Minor.
05:18 PM andypugh: The "M" range consisted of the 5-inch centre height "Minor" and three other (very rare) types, a 6.125" "Major", the almost identical 7.25-inch "Magna" and the 8.25" "Marquis".
05:18 PM Tom_itx: aww cmon andypugh you need another lathe project...
05:18 PM andypugh: So 12” swing compared to the 10” of mine.
05:19 PM andypugh: It’s a rare bird, I have only seen one other one.
05:19 PM gloops: http://www.ebay.co.uk/itm/OLD-DRUMMOND-ENGINEERS-LATHE-BARN-FIND-240-VOLTS-NEEDS-SOME-RESTORATION-/112598774307?
05:19 PM gloops: that would be more of a challenge
05:20 PM MarcelineVQ: gosh you brits have a ton of cheap gear on ebay, holdovers from all the crafting needed after the war I wonder?
05:20 PM CaptHindsight: what year do you think that is from?
05:20 PM Tom_itx: andypugh that thing just looks heavy
05:21 PM CaptHindsight: hand crafted leather drive belt
05:21 PM andypugh: CaptHindsight: Around 1960 probably (The Holbrook)
05:21 PM andypugh: The Drummmond is 1930s
05:22 PM gloops: Marcel this used to be the workshop of the world
05:23 PM andypugh: The Drummond isn’t a Drummond, I don’t think
05:23 PM CaptHindsight: MarcelineVQ: they keep their old steam engine trains running as well
05:23 PM gloops: still some old gear knocking about, mostly junk in all honesty, but i love these old machines
05:23 PM MarcelineVQ: I wish there was more of that history here, it's pretty hard to find gear to take home
05:23 PM andypugh: We recently made a brand-new steam train.
05:24 PM gloops: im more used to seeing the round bed drummonds on ebay
05:24 PM MarcelineVQ: if there's gear here it's logging gear, not exactly home-shop equipment
05:24 PM andypugh: https://en.wikipedia.org/wiki/LNER_Peppercorn_Class_A1_60163_Tornado
05:24 PM CaptHindsight: MarcelineVQ: isn't it more logging and sailing history there?
05:26 PM gloops: http://www.ebay.co.uk/itm/Metal-lathe-drummond-Vintage-Workshop-small-lathe/302485673001? - the screw was down the centre of the bed
05:27 PM MarcelineVQ: I found a little lathe the other day that looked like a fun thing to have, but I've no jobs for it currently so it'd probably be a waste https://s3-us-west-2.amazonaws.com/usedphotosna/64940800_934.jpg
05:27 PM andypugh: Someone on the forum was going to CNC one of the round-beds.
05:28 PM gloops: well, why not heh
05:28 PM andypugh: (Not a crazy idea, screw down the middle is a good fit to a ballscrew conversion, out of the swarf)
05:28 PM gloops: hmm, that is good thinking yeah
05:30 PM gloops: polished up that would make a nice ornament, on a large mantlepiece
07:53 PM Munt_ is now known as Munt
09:27 PM rebecca_: i'm thinking of building a new and large CNC. anyone recently purchased a set of linear rails for a large machine (biggest axis >= 1500mm) and had them arrive within tolerances, acceptable quality and straight/undamaged?
09:32 PM sync: rails usually do not come extremely straight as they are just profile ground, you have to align them anyway
09:33 PM rebecca_: how do you go about that? carefully hitting them in just the right spots>
09:33 PM rebecca_: ?
09:39 PM sync: no, you mount them on your machine bed and then go from screw to screw and either shim them if need be, although unlikely but you have to adjust them from side to side
09:39 PM rebecca_: ahhhh
09:39 PM rebecca_: ok
09:39 PM sync: if your bed has a locating edge milled into them you can just tighten them against that
09:39 PM sync: as the profile is correct
09:40 PM rebecca_: that's a good idea
09:40 PM rebecca_: thanks :D
09:41 PM sync: read your linear guide vendors manual
09:41 PM sync: it'll tell you what to do
09:42 PM sync: a edge will also increase stiffness
09:42 PM rebecca_: i think i would construct the machine body primarily from pieces cut on a larger CNC i know to be quite dimensionally consistent so milling a slot to align/hold the guides should make it relatively straightforward
09:57 PM andypugh: Night all… just noticed the time.
09:57 PM zancas: Gnight andypugh.