#linuxcnc Logs

Jun 05 2019

#linuxcnc Calendar

02:11 AM Loetmichel: morning...
02:15 AM Loetmichel: *NIIIICE*.. Coworker finally got the 4 Steppers, drivers and PSUs for his gantry mill delivered to the company... a BIT monstrous for a gantry... -> http://www.cyrom.org/palbum/main.php?g2_itemId=17397&g2_imageViewsIndex=1
03:33 AM matic292: Hi! I would like to ask if anyone use Fusion360 as CAM ? I would like to engrave something small and im always getting errors.
04:53 AM jthornton: morning
04:54 AM XXCoder: hey jt
04:54 AM XXCoder: forgot to menion I did a dumb thing yeserday heh
04:54 AM jthornton: matic292: https://www.scorchworks.com/Fengrave/fengrave.html
04:55 AM XXCoder: I was setting up to use dial test indictor to find x and y
04:55 AM XXCoder: oh spindle is locked so I rose spindle a little so I could remove it. forgot to do exactly that. does s1000 m3
04:55 AM XXCoder: oh shit hit spindle stop
04:55 AM XXCoder: thankfully my $200 tool didnt fly off
04:56 AM jthornton: yikes
04:56 AM XXCoder: my C indictor holder was tight as hell had hard time loosening it again
04:57 AM XXCoder: indictor gripper and rod was also jammed in, but thankfully loosened with light use of pliers
04:58 AM XXCoder: same thing happened with my coworker, unfortunately story wasnt as happy
04:58 AM XXCoder: his indictor flew off and hit wall, destroyed dial . it was damn lucky rest of it was fine, so he got new dial for it.
05:00 AM XXCoder: worse dial test indictor abuse I have ever seen was my yet another coworker
05:01 AM XXCoder: he jogged z into fixture with it
05:01 AM XXCoder: both pin end and holder end was totally destroyed. junk now
05:02 AM jthornton: I have a 1" divot in a vise where I drilled too deep once
05:03 AM XXCoder: doh hopefully it didnt hit vise screw
05:04 AM jthornton: no just a 1/4" or so deep]
05:04 AM XXCoder: not too bad
05:05 AM Loetmichel: XXCoder: i managed to frictionweld a 3mm tungsten carbide twoflute to the vise... does that count?
05:05 AM Loetmichel: :-)
05:05 AM XXCoder: many vises at work has some damage, but understandable, as most of em is over decade old or more
05:05 AM XXCoder: so even rare oops builds up damage
05:05 AM XXCoder: ow loet lol
05:07 AM Loetmichel: moved by hand in x with z down, 24krpm spindle... touched the side of the vise with the shaft of the tool... before i could hit estop it was red, yellow, white... then the estop stopped the spindle...-> tool firmly welded to the vise ;)
05:11 AM XXCoder: fast
05:24 AM XXCoder: jthornton: check this out https://www.youtube.com/watch?v=mZUsbUdvXKQ
05:25 AM XXCoder: one minute video, talks about fixing road with ternoplastic
06:27 AM Tom_L: morning
06:27 AM XXCoder: hey
06:28 AM jthornton: morning
06:31 AM Tom_L: oh.. that mold i made week or so ago...
06:31 AM Tom_L: http://ruemohr.org/~ircjunk/tempimage/p1120543.jpg
06:32 AM Tom_L: he finally got it working
06:33 AM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/rue/Can_Holder/A3/Mold11.jpg
06:34 AM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/rue/Can_Holder/A3/A3_batch/Batch8.jpg
06:34 AM Tom_L: i still made a few to get him by
06:37 AM XXCoder: nice
06:37 AM XXCoder: how do he push metal in?
06:37 AM XXCoder: pour more like sorry not plastic lol
06:57 AM jthornton: looks like thunder storms will start here tonight and possibly end on Monday...
09:14 AM perry_j1987: morning all
09:36 AM perry_j1987: deciding if i need another coffee or not before heading to the shop
10:04 AM Deejay: hi
11:43 AM Tom_L: nice thing about the mill i built over the old sherline is when the tool holder doesn't quite clear a bolt head it doesn't lose steps, it just moves the bolt
11:49 AM roycroft: in many applications i really like the look of black oxide coated fasteners, but don't like their tendency to rust in high humidity/wet environments
11:49 AM roycroft: but then i found these, which i did not know existed for some reason:
11:49 AM roycroft: https://www.mcmaster.com/93791a491
11:50 AM roycroft: that's my favorite thing in the world today
11:53 AM jthornton: and McMaster-Carr fasteners are usually made in the US
11:53 AM roycroft: another good thing
11:53 AM roycroft: and they usually deliver to me in two days
11:53 AM Tom_L: buy the fastener and the tool in the same place and neither will strip out the other :)
11:54 AM roycroft: are you sure about that?
11:54 AM Tom_L: not completely
11:54 AM roycroft: because i know for a fact that i can go to harbor freight and buy some fasteners and the insertion tool from them and destroy both while attempting to install the fasteners
11:56 AM roycroft: a chrome-plated pot metal screwdriver installing zinc-plated pot metal screws is generally not going to work out very well
11:57 AM FinboySlick: Tom_L: Moves the bolt... What sort of bolt are we talking about?
12:11 PM Tom_L: hex cap screws
12:11 PM Tom_L: smallish
12:11 PM FinboySlick: Well, that's distinctly stiffer than a Sherline.
12:12 PM Tom_L: i think just about anything is
01:15 PM PL7icnc: bigjohn is doing great on helping to get systems going
01:16 PM PL7icnc: https://gnipsel.com/
02:07 PM CaptHindsight: trying to find precision trapezoidal lead screws in stock in the US is not easy
02:08 PM CaptHindsight: (metric)
02:20 PM gregcnc: The only one I know of is Universal
02:45 PM FinboySlick: CaptHindsight: How 'imprecise' would a cheap one be? It seems to me like something that tends to naturally average out its error.
02:57 PM CaptHindsight: FinboySlick: The Chinese crap everywhere is +- 1-2mm
02:58 PM CaptHindsight: I ordered one on a lark and the nut would roll down the screw by raising it vertically
02:58 PM FinboySlick: Over the length you mean? The movement couldn't vary by that much without binding otherwise, no?
02:58 PM CaptHindsight: should have been labeled "child's toy"
02:59 PM CaptHindsight: 2mm lash
02:59 PM FinboySlick: Oh.
02:59 PM CaptHindsight: cut length, a precise as the hacksaw can cut
02:59 PM CaptHindsight: a/as
03:00 PM CaptHindsight: over distance who knows, it's like trying to measure the thickness of jello with a caliper
03:01 PM FinboySlick: Well, if you can't make it precise, make it adjustable and put two opposing nuts? ;)
03:02 PM fragalot: CaptHindsight: please allow +/- 5cm due to manual measurement
03:03 PM FinboySlick: If specification says one foot, make sure the worker with the 12" foot made it.
03:04 PM Deejay: gn8
03:05 PM CaptHindsight: search for lead screws ends up with 90% ballscrew listings
03:06 PM fragalot: CaptHindsight: try adding "3D printer" or "prusa" to your search term
03:07 PM CaptHindsight: oh it's bad enough already
03:09 PM CaptHindsight: oohh I think I found some NOS in stainless for cheap
03:09 PM CaptHindsight: bingo
03:09 PM fragalot: "stainless'
03:10 PM CaptHindsight: SS lead screw
03:10 PM fragalot: only in the finest 304-ish
03:10 PM CaptHindsight: actually 303
03:13 PM CaptHindsight: .010”/ft. for standard .003”/ft. for precision
03:14 PM CaptHindsight: ~1um/mm
03:14 PM fragalot: isn't precision usually measured in microns?
03:15 PM CaptHindsight: yeah but i use maths to convert
03:16 PM fragalot: yea but even a cheap C7 ballscrew is at 1,7µ/mm
03:17 PM CaptHindsight: came across some C3 screws for 1/10 the price, NOS as well
03:17 PM CaptHindsight: 10x the price of lead screws
03:20 PM CaptHindsight: C7 is +- 50um/300mm
03:21 PM XXCoder: crazy
03:32 PM JT-Shop: what is the hole size for a M30 x 3.5 thread?
03:47 PM Tom_L: http://www.engineershandbook.com/Tables/metrictapdrill.htm
03:47 PM Tom_L: 3.5 isn't listed there
03:48 PM Tom_L: 1 3/64ths
03:48 PM Tom_L: https://www.wlfuller.com/html/tap_drill_chart.html?no_redirect=true
03:48 PM XXCoder: M3.5 x 0.6
03:48 PM XXCoder:
03:48 PM XXCoder: 2.90
03:48 PM roycroft: um, that link says 26.5mm for an m30x3.5 thread
03:48 PM XXCoder: erm nm lol
03:49 PM XXCoder: yeah
03:51 PM Tom_L: drill to 1" and bore the rest?
03:52 PM Tom_L: unless it's OD of course
03:52 PM Tom_L: hrm, you said hole..
03:53 PM roycroft: if the material is aluminium, a 1" hole might just be close enough
03:53 PM XXCoder: or reamer
03:53 PM XXCoder: roy .04" is little bit much
03:53 PM roycroft: for a small hole sure
03:53 PM XXCoder: though 1" reamer is bit expensive
03:53 PM roycroft: for somthing that big it might be ok in something soft
03:53 PM Tom_L: fine thread too
03:54 PM roycroft: m30x3.5 is coarse thread
03:54 PM roycroft: m30x2 is fine thread
03:54 PM Tom_L: yeah nevermind. i'm half asleep
03:54 PM roycroft: metric thread pitches are "backwards" to american customary thread pitches
03:55 PM XXCoder: tpi yeah
03:55 PM Tom_L: gettin up at 3 threw my whole day off
03:55 PM roycroft: threads/inch vs. mm/thread
03:55 PM roycroft: more upside down than backwards, i suppose
03:57 PM XXCoder: komit if has one lol
03:57 PM XXCoder: so expensive...
03:58 PM roycroft: boring head
03:58 PM roycroft: also expensive, but the cost is in time, not toolign
03:58 PM XXCoder: honestly all depends on tol, may be enough to just drill then endmill
03:58 PM FinboySlick: Tom_L: Is that related to your mill moving bolts?
03:59 PM XXCoder: its for JT-Shop not tom
03:59 PM Tom_L: FinboySlick no the mill was before that
04:00 PM Tom_L: i knew it would be close :)
04:00 PM Tom_L: it just kinda shaved part of the head off a bit
04:01 PM Tom_L: it was only a 10-32 screw
04:01 PM Tom_L: not like some 1/2" hex head or such
04:02 PM FinboySlick: With the cutter or with the holder?
04:02 PM Tom_L: holder
04:03 PM FinboySlick: Poor holder.
04:03 PM Tom_L: it's a new method of material removal
04:03 PM Tom_L: :)
04:03 PM Tom_L: probably not that new...
04:03 PM FinboySlick: Did you apologize to it at least?
04:03 PM Tom_L: heh
04:03 PM Tom_L: it didn't mark the holder that i noticed
04:03 PM Tom_L: thanks to china bolts
04:11 PM roycroft: sounds kind of like a miller-shaper
04:12 PM JT-Shop: Oh I just remembered you subtract the pitch from the diameter so 30 x 3.5 is 26.5
04:13 PM XXCoder: interesting
06:13 PM Connor: Just picked up a 192-656 Mitutoyo height gauge. It's way bigger than I thought. It's 18", but, I didn't realize the footprint size.. So, I figured out most of everything.. Anyone know what the PRE button does? It has On/Off (and looks like ABS is set at that time). Inc is set when you Zero it out.. I don't see a way to go back to ABS though.
06:18 PM Tom_L: https://www.mitutoyo.eu/en_us/downloads/manuals/height-measuring-tools/
06:20 PM Connor: Yea. the 656 isn't there.. and everything listed is way newer and they have different buttons.
06:20 PM Tom_L: i thought the 192 series would be similar
06:24 PM Connor: The first 192, is analog.. The second is the new version. :(
06:34 PM Tom_L: maybe you could email them
06:35 PM roycroft: if the footprint is too big you can always give it a trim on your band saw or grinder :)
06:36 PM jthornton: HOT SAW
06:36 PM roycroft: or that
06:36 PM roycroft: or an oxy-acetylene torch
06:36 PM roycroft: or plasma cutter
06:36 PM jthornton: make smoke and sparks
06:36 PM Tom_L: i hear thunder..
06:36 PM Tom_L: must be more rain on the way
06:36 PM roycroft: there are almost infinite ways to get that thing cut down to size
06:36 PM jthornton: keep it at your house
06:36 PM roycroft: it was 28 degrees here an hour ago
06:36 PM Tom_L: i'm more than happy to share that
06:37 PM roycroft: now it's 20 and the clear sky is no more
06:37 PM Tom_L: although the river is almost back to normal
06:37 PM jthornton: F or C?
06:37 PM roycroft: c
06:37 PM Tom_L: K
06:37 PM roycroft: i don't do f
06:37 PM roycroft: we had flash flood warnings in norteastern lane county over the weekend
06:38 PM roycroft: but skies were clear here
06:38 PM roycroft: those pesky mountains really mess up the weather sometimes
06:39 PM roycroft: anyway, with this huge and sudden temperature drop and the clouds rolling in i expect severe weather warnings soon
06:39 PM roycroft: we might get one of our rare thunderstorms
07:00 PM Connor: roycroft: Umm.. No. :) It's fine just as it is.
07:27 PM roycroft: ok, i was just trying to help :)
07:58 PM Tom_L: mmm, sky just turned another shade of ugly
08:33 PM Connor: Well, that's odd.. I don't think it has the correct scribe in it.. It won't touch the surface plate...
08:33 PM Connor: It's like it's too short...
09:08 PM perry_j1987: interesting - i just came across 4th axis pallets
09:08 PM Tom_L: new to pallet changers?
09:11 PM perry_j1987: ya
09:11 PM perry_j1987: new to everything
09:12 PM perry_j1987: just seen one had a center bolt you could undo a little and a slotted washer slides off and the whole drum comes off over the central bolt
09:12 PM perry_j1987: can swap it out for anotehr one ready to go
09:15 PM perry_j1987: I have one of these https://ae01.alicdn.com/kf/HTB1nRPfwb1YBuNjSszhq6AUsFXaY/hollow-shaft-3-Jaw-100mm-chuck-CNC-4th-Axis-CNC-dividing-head-for-Mini-CNC-router.jpg_640x640.jpg