#linuxcnc Logs

Aug 13 2019

#linuxcnc Calendar

01:49 AM Loetmichel: Elmo40: it is
01:54 AM Loetmichel: _unreal_: its an old idea
01:54 AM Loetmichel: did it multiple times
01:54 AM Loetmichel: http://www.cyrom.org/palbum/main.php?g2_itemId=359
01:54 AM Loetmichel: http://www.cyrom.org/palbum/main.php?g2_itemId=344
04:29 AM plantroon: anybody has an idea what these desk cutouts are good for? They interfere with chair arm rests if I want to get close to the table (which is the better ergonomic position). Here's what I mean: https://imgur.com/G5RJssX
04:52 AM jthornton: morning
05:11 AM Tom_L: morning
05:12 AM Tom_L: plantroon, keyboard?
05:13 AM plantroon: Tom_L: no, it is just a cutout on the desk, I can't by any means put a keyboard in there. There's no tray and I do not plan on adding a tray to the setup
05:21 AM Deejay: hi
06:20 AM Loetmichel: *cough* *dries eyes* maaan that korean that made that fres bami goren i am just eating for lunch put a SERIOUS amount of fire in there... $me uses a couple liters of bitter lemon to douse that "fire" :-)
06:21 AM Loetmichel: fresh, bami goreng
07:35 AM Elmo40: Loetmichel, do you have tips? i'd like to reduce RF from my equipment.
07:37 AM Elmo40: do you place a choke on one or both wires feeding the equipment? how about within the equipment itself? is the aluminum housing the best method?
08:29 AM Loetmichel: Elmo40: faraday cage of any conductive metal (steel or tin works actually better than aluminium or copper because it has a significant resistance and can convert RF into heat instead of reflecting it back), chokes and filters on all I/Os, and maybe some ferrite plates on chips that generate lots of RF (like CPU and ram)
08:41 AM Elmo40: ferrite plate?
08:41 AM Elmo40: is that simply a flat piece?
09:01 AM net|: i wonder if a working bench grinder with autoshutoff would make a good mailbox
09:01 AM net|: then passerby's can use it out in the country
09:04 AM * Loetmichel is just printing 2 speaker boxes for a Monitor in PLA... (its for 20*40mm 1W speakers)... doubt that will work without support with those large overhangs... but we'll see ;) -> http://www.cyrom.org/palbum/main.php?g2_itemId=17463&g2_imageViewsIndex=1
09:14 AM net|: are there many public shops in citys where anyone can take a vehicle and rent a mechanic bay for a couple days fully toold at next to nothing cost ?
09:15 AM Loetmichel: net|: here in germany: some
09:15 AM Loetmichel: not THAT many
09:15 AM Loetmichel: in my city i know of 4 "self repair car shops" for about 125k residents
09:16 AM Loetmichel: but the "next to nothing cost: nope.
09:16 AM Loetmichel: IIRC 50 eur a day for the lift and basic tools
09:17 AM Loetmichel: welder and similar tools between 5 eur and 50 eur a day extra
09:22 AM gregcnc: never heard of such a thing. maker space for car people? Order 10mm sockets by the case?
09:26 AM Loetmichel: gregcnc: "self repair shops"
09:26 AM Loetmichel: you can rent a booth with a lift and some tools and repair your car yourself
09:26 AM Loetmichel: you even get some basic assistance from the resident car mechanic.. IF he is free
10:10 AM gloops: hmm, looks like its all kicking off in Hong Kong
11:04 AM jym: morning
11:13 AM Loetmichel: hihi, got the pole postion on the traffic light to the autobahn again on the way home from work... 9.1sec 0-100kph, 16,9sec for the quarter mile. Not THAT bad for a 2001 BMW 525i touring without any tuning and 160kmiles on the odo... :-)
11:17 AM jym: Loetmichel: lol
11:18 AM Loetmichel: jym: ... and totally legal here in germany as long as you dont spin the tires (that would be "unneccesary (sound) pollution")
11:18 AM Loetmichel: :-)
11:32 AM pcw_home: anyone else getting multiple emails (say a day or two old) from the forum?
12:19 PM JT-Shop: I've not noticed any
12:19 PM JT-Shop: I'll log in and nose around
12:20 PM JT-Shop: but first lunch...
01:00 PM JT-Shop: pcw_home: I have noticed some bounced emails from folks that should not be bounced
02:23 PM _abc_: Machining, manual, question: would it be ok to make a thread cutter from a screw of suitable pitch into which lengthwise cuts (2) are made with a diamond wheel?
02:24 PM _abc_: I need a strange thread size, to thread holes into plastic/fiberglass. It need not be very resilient, 10 holes is all it has to last.
02:25 PM _abc_: Diameter is quite small, 1/10in or so
02:25 PM JT-Shop: might need to taper the start and put a hook on the cut
02:25 PM _abc_: I'll assume a 0 rake cutter will do the work in plastic, I don't want it to bite and tear
02:25 PM JT-Shop: fiberglas may be a bit tough
02:26 PM _abc_: fg will be pre holed then just threaded. I intend to temper/harden the screw thread cutter after I shape it
02:27 PM _abc_: Would this be a waste of time? This thing is to replace a $29 thread cutter if ordered. The expense cannot be justified.
02:27 PM _abc_: Tapering is in order yes, but the hook is not.
02:28 PM _abc_: The main thing I see is, getting chips out will not happen by itself. I have no way to make the slots twisted and self cleaning.
02:29 PM CaptHindsight: $29 sounds like a bargain
02:29 PM _abc_: No it is not, it is more than the whole work is worth.
02:29 PM CaptHindsight: unless your time is worthless
02:29 PM _abc_: Everything I said above can be done in 30 minutes
02:30 PM JT-Shop: make the slot angled so it forces the chips out the bottom
02:30 PM _abc_: I just said I can't really.
02:31 PM _abc_: Would "distributed" angled slots work?
02:31 PM _abc_: Like a high pitch spiral's tangents with the screw?
02:32 PM _abc_: I.e. instead of one slot, several "dashes" angled, on the same generatrix?
02:45 PM gregcnc: main thing is a screw will cut an undersize thread
02:50 PM gloops: a screw? like a wood screw?
02:52 PM gloops: how about one of those self drilling screws self tapping screws
02:54 PM Tom_L: if you back it out several times a slot should work fine
02:54 PM Tom_L: a couple
02:55 PM Tom_L: with that said, a thread cutter can be used on multiple threads (single point cutter)
02:55 PM gloops: fibreglass is prone to cracking and chipping
02:56 PM gloops: like brittles
02:56 PM gloops: brittle
02:56 PM Tom_L: heat it red hot and screw it in :) just back it out before it cools too much
02:56 PM Tom_L: ^^ hope you took that not seriously
02:57 PM gloops: no i was thinking the same
02:57 PM Tom_L: brass thread inserts are installed with heat
02:59 PM gloops: drill it and epoxy a threaded insert in
02:59 PM Tom_L: he's after cost savings
03:00 PM gloops: well i dont know what the job is, but fibreglass seems a bit dodgy to be tapping, XXCoder would know he works on it all the time
03:02 PM Tom_L: sammich it between sacrificial scrap to keep it from chipping out the top
03:03 PM gloops: what they want to be doing is laminating a plug in with threads
03:07 PM XXCoder: gloops: no tapping
03:09 PM XXCoder: there is tapped parts later, but its by inserting brass thats very cold then tapping that
03:09 PM gloops: XXCoder is fibreglass good for threading or not?
03:09 PM gloops: ahh yeah, thats what i would have though
03:09 PM gloops: thought
03:09 PM XXCoder: no idea, never made any part foberglass that would be tapped directly. doubt it will ever be done like that. too brittle
03:11 PM gloops: yeah in my amateurish meddling with fibreglass its pretty obvious that trying to tool it is precarious, chips, cracks pretty easy
03:11 PM XXCoder: and tool destroying heh
03:11 PM XXCoder: much powder in those runs too
03:12 PM XXCoder: dont fuck up your lungs, use mask or use tons coolant
03:14 PM gloops: i dont do much with it
03:23 PM CaptHindsight: the R pi 3's HDMI driver is so crappy I have to set it at 110% output to drive a 4K monitor or projector
03:24 PM CaptHindsight: and I'm not sure if it is reliable yet at 110%
03:31 PM CaptHindsight: G10/FR-4 circuit boards are fiberglass and epoxy, they cut well but not thread well
03:32 PM CaptHindsight: fiberglass is often used with polyester resin vs epoxy to lower cost
03:32 PM CaptHindsight: in non PCB applications
04:11 PM MarcelineVQ: CaptHindsight: just with a tap or have you tried threadmilling them?
04:12 PM MarcelineVQ: not that the threads would hold too well anyway I guess given the nature of resin'd textile
04:15 PM CaptHindsight: yes, just FYI
04:16 PM CaptHindsight: MarcelineVQ: read backlog for more insight ^^
04:16 PM CaptHindsight: please
04:17 PM MarcelineVQ: aha haha, sorry
04:30 PM _abc_: The fiberglass I have in mind is electronics style FR4
04:31 PM _abc_: Does not crack and is quite easily used as tapped nut once done properly.
04:31 PM _abc_: Retaining strength of screws is not as high as in metal but it is okayish for what I need.
04:36 PM CaptHindsight: coat the screw threads with oil, then epoxy and thread into hole for best grip
04:36 PM CaptHindsight: ptfe tape coated screw threads, then epoxy in holes
04:37 PM CaptHindsight: why bother tapping?
04:59 PM _unreal_: sup
05:03 PM Deejay: gn8
06:26 PM _unreal_: odd feeling not NEEDING to mill anything right now
06:34 PM * JT-Shop listens to 99 Luftballoons by Nena...
06:35 PM JT-Shop: I think it's better than the English version
06:37 PM Tom_L: yeah
06:38 PM JT-Shop: now some 1981 Rush
06:39 PM _unreal_: ?
06:39 PM _unreal_: hum
06:40 PM JT-Shop: Moving Pictures album
06:42 PM Tom_L: fly by night was ok
06:43 PM JT-Shop: yea
06:44 PM JT-Shop: I used to listen to the moody blues and pink floyd on a sony walkman while flying to west africa to go to work
06:44 PM JT-Shop: I think I still have the walkman
06:46 PM Tom_L: brain salad surgery was on the list
06:46 PM Tom_L: ELP
06:47 PM JT-Shop: yep and Joe Cocker
06:47 PM JT-Shop: I think I have 3.5GB of music
06:49 PM JT-Shop: I have about a dozen ELP songs
06:49 PM JT-Shop: the best of elp
06:53 PM skunkworks: watching the wizard of oz currently... (4 and 6yold...)
07:18 PM _unreal_: I'm looking for a micro sized vise http://www.mechanicalphilosopher.com/1225.jpg kind of like this
07:19 PM _unreal_: 3/4" tall at the most idealy dirt cheap
07:19 PM _unreal_: smaller the better
07:22 PM Tom_L: make one
07:22 PM Tom_L: you were complaining about not having anything to mill
07:23 PM skunkworks: I had an Tom_L you make it sounds sooooo easy...
07:23 PM skunkworks: Tom_L you make it sounds sooooo easy...
07:24 PM Tom_L: i've got a kurt model you can scale :)
07:33 PM _unreal_: I cant mill aluminum. well I've never tried ether
07:34 PM _unreal_: fuck it I'm going to mill out 2 more hold downs
07:34 PM _unreal_: so I have 5 of them finally
07:34 PM _unreal_: I still need to mill out there core on my drill press because Idont have a vise for my cnc
07:34 PM _unreal_: tiny vise
07:34 PM Tom_L: why such a tiny vise?
07:34 PM _unreal_: :90
07:34 PM _unreal_: My cnc only has 1.5" usable Z
07:35 PM Tom_L: i'd work on that instead
07:35 PM _unreal_: the bottom of my X/Z
07:35 PM _unreal_: is 1.5" above the table
07:35 PM _unreal_: not much I can do
07:35 PM _unreal_: and I'm not about to totaly redesign my cnc
07:35 PM _unreal_: not that its been alibned
07:35 PM _unreal_: aligned etc..
07:35 PM _unreal_: now
07:35 PM Tom_L: sam and I both raised our Z
07:35 PM _unreal_: now ttha
07:36 PM _unreal_: I'd buy or build a new cnc bfore I bothered
07:36 PM _unreal_: remember my cnc is made from G10 material
07:36 PM _unreal_: and a lot of small peices
07:36 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/cnc/Mill_Steel/Assembly/Final/Z-Riser_blocks.jpg
07:37 PM _unreal_: you have an easy way to raise yours
07:37 PM _unreal_: I dont have an easy method https://drive.google.com/open?id=1D-k13xqrv-9Z-6ok8anqo4-VMt7iCLG4
07:37 PM _unreal_: I'd have to modify a bunch of stuff JUST to raise the bottom of the Z carrage
07:39 PM _unreal_: the end of the video you can see the full machine https://drive.google.com/open?id=1Epi_HnCUA83Bbr7-sbDEt4EFKLzObQoM
07:39 PM _unreal_: just not worth the effort
07:45 PM _unreal_: There I'm milling my first of two more hold downs
07:46 PM _unreal_: I really have worked out the play in my cnc since I adjusted the alignment
07:46 PM _unreal_: it doesnt seem to have the play that it had before
07:55 PM skunkworks: http://electronicsam.com/images/greenmachine/20180823_225905.jpg
07:57 PM _unreal_: I have to admit this tiny 12v vac is really holding up well
07:57 PM _unreal_: I dont know how many hours the motor is going to last for beuase its got sleeve bearings
07:57 PM _unreal_: but for the time being hay....
07:58 PM skunkworks: http://electronicsam.com/images/greenmachine/20180823_225830R.jpg
07:59 PM _unreal_: OH THANK GOD you fixed the world
08:04 PM flyback: _unreal_, did you see the ones on bgmicro
08:05 PM flyback: THANK YOU _unreal_
08:05 PM flyback: ME SHOWING you that page turns out he's selling a tuning cap eight now
08:05 PM flyback: i can make my crystal radio
08:05 PM flyback: nm pf is too low :(
08:08 PM flyback: http://www.bgmicro.com/mini-pump-air-gas.aspx
08:08 PM flyback: http://www.bgmicro.com/mini-pump-or-vacuum-12v-operation.aspx
08:08 PM flyback: one is brushless but both are good
08:09 PM _unreal_: what kind of a pump is that
08:09 PM _unreal_: ?
08:11 PM flyback: vac or air
08:11 PM flyback: some go both ways like extor
08:12 PM _unreal_: shhhh
08:12 PM _unreal_: I'm interested in the brushless one
08:18 PM _unreal_: fuck you flyback I have alrady found 4 thinks I'm 99% likely to purchased from that size
08:18 PM _unreal_: and still looking
08:25 PM flyback: extor, is a friend of mine that's why I said that
08:25 PM flyback: :P
08:28 PM _unreal_: I need to really dbl check the size of the motor but i may get that brushless because if its the right size I could swap it for the motor driving the vacuum for my cnc machine maybe?
08:28 PM _unreal_: but I do wondre about speed control
08:29 PM _unreal_: if it has a built in brushless speed controller thats an issue
08:29 PM _unreal_: maybe
08:29 PM flyback: read the info on it
08:30 PM _unreal_: info is vage
08:31 PM _unreal_: not sure if its tlking about the blue box or the motor
08:31 PM _unreal_: I need to make din for my daughter anyways its late
08:31 PM flyback: white pwm
08:31 PM flyback: try this
08:31 PM flyback: Hargraves mini pump unit wiring
08:31 PM flyback: in google
08:32 PM flyback: 2 Wire Red (+), Black (-)
08:32 PM flyback: 3 Wire (Speed Control) Red (+), Black (-), White (PWM) or Yellow (Analog)
08:32 PM flyback: 4 Wire (Speed Control & Feedback) Red(+), Black (-), White (PWM) or Yellow (Analog), Blue (Tachometer)
08:32 PM flyback: Wire specification
08:32 PM flyback: 22AWG, Insulation OD 0.051 in (1.30 mm), 20” (508 mm) Wire Leads
08:32 PM flyback: if this is a match
08:33 PM flyback: yeah parker owns hargraves
09:01 PM flyback: http://www.bgmicro.com/credit-card-gizmo.aspx
09:46 PM _unreal_: flyback, that battery looks interesting in regards to the zipits
09:46 PM _unreal_: http://www.bgmicro.com/bat1087.aspx
10:19 PM flyback: OH SHIT
10:19 PM flyback: I never realized
10:51 PM extor: I found it next to imppssobe to find awg 24 but splicers for ultra thin wires on amazon. But the one I found was nice because it doesnt require any solder tinning or even crimping
11:23 PM _unreal_: https://sup.star-board.com/board-selector-start/