#robotics Logs
Mar 25 2020
#robotics Calendar
08:54 AM cloudia is now known as corona-cat
09:17 PM eadthem: what is a gradiant indicator with magnetic base?
09:17 PM eadthem: doing a robot repair at work and they want you to use a ".0005” gradient indicator with magnetic base" is that just a standard dial indicator but highly accurate?
09:20 PM eadthem: maybe this? https://www.amazon.com/dp/B07Q5X3V96/ref=sspa_dk_detail_1?psc=1&pd_rd_i=B07Q5X3V96&pd_rd_w=D9bcG&pf_rd_p=48d372c1-f7e1-4b8b-9d02-4bd86f5158c5&pd_rd_wg=C9Gm4&pf_rd_r=0B14EXA0D5KW2WQNTYK0&pd_rd_r=3cbd15d0-2209-4c4a-bfae-ca8942ed51a3&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEzQlNLSzQwWktZSjdUJmVuY3J5cHRlZElkPUEwMjI4MTczRkIyTUtaRzcyNlY4JmVuY3J5cHRlZEFkSWQ9QTA1MDEzNTkyNkMwSkE2SDBWMURKJndpZGdl
09:20 PM eadthem: dE5hbWU9c3BfZGV0YWlsJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==
09:20 PM eadthem: well that failed https://www.amazon.com/dp/B07Q5X3V96/ref=sspa_dk_detail_1
09:29 PM rue_mohr: half thou
09:30 PM Tom_L: dial indicator, calipers, last word indicator,.....
09:30 PM rue_mohr: marks on a indicator are usually 1 thou, its easy to see half
09:30 PM Tom_L: depends on the purpose as to the form the gradient takes
09:30 PM Tom_L: could be color gradients
09:31 PM Tom_L: surface finish gradients
09:31 PM Tom_L: etc
09:31 PM eadthem: in this case its aligning a Y axis linear motor rotor (if you want to call it a rotor) to a Y axis it mounts to
09:32 PM Tom_L: axial indicator?
09:32 PM eadthem: err stator
09:32 PM Tom_L: i call what you linked a last word indicator
09:33 PM Tom_L: rather short travel but accurate
09:34 PM Tom_L: https://www.youtube.com/watch?v=5QcYX240U2I
09:34 PM eadthem: supose to snug each screw 1 at a time moving the beam back and forth mesurining/comparing the 2 tabs, until there -/+ .0004"
09:35 PM Tom_L: various uses
09:35 PM Tom_L: that would be a good one for that then
09:35 PM Tom_L: i used that when i aligned my linear rails
09:37 PM eadthem: prob be going for this one, https://www.amazon.com/Mitutoyo-513-504T-0001-Pocket-Indicator/dp/B000VB8JYW/ref=sr_1_3
09:37 PM eadthem: robots 300K new, i think we can aford to use decent tools to fix it.
09:38 PM Tom_L: mitutoyo is top notch
09:38 PM eadthem: yep
09:39 PM Tom_L: https://www.ebay.com/itm/Noga-DG1033-Magnetic-Base-176-lb-Holding-Power-4-Arm-Dial-Test-Indicator/131866471949?epid=19010919364&hash=item1eb3daae0d:g:OckAAOSwjXZctQEe:sc:USPSPriority!67213!US!-1
09:39 PM Tom_L: noga makes top notch arms too
09:40 PM Tom_L: you can get chinese equivalents for about $25
09:40 PM eadthem: i was prob going to go for a cheep base
09:40 PM Tom_L: https://www.ebay.com/itm/135-LBS-Magnetic-Base-Dial-indicator-Holder-w-Fine-Adjustment-Mech-Arm-Red-Alu/293128747890?hash=item443fd5bb72:g:hGMAAOSwW4ddDQpn
09:41 PM Tom_L: i got one similar
09:41 PM Tom_L: just don't overtighten it
09:41 PM Tom_L: it will pull the bolt thru the cam
09:41 PM eadthem: ?
09:41 PM Tom_L: if you overtighten it, it will fuck it up
09:41 PM Tom_L: :)
09:42 PM Tom_L: the center knob
09:42 PM eadthem: oh
09:42 PM Tom_L: noga are nice
09:43 PM Tom_L: https://www.youtube.com/watch?v=5QcYX240U2I
09:43 PM Tom_L: there's the chinese one
09:44 PM Tom_L: but they make positioning the indicator very easy
09:45 PM eadthem: https://www.amazon.com/Clockwise-Tools-MGBR-01-Magnetic-Indicator/dp/B07KPY6ZC3/ref=sr_1_75
09:45 PM Tom_L: yeah
09:46 PM eadthem: thanks that helps alot
09:46 PM Tom_L: make sure the indicator has a dovetail
09:46 PM Tom_L: the end of the holder has a dovetail to fit those small last word indicators
09:46 PM eadthem: it dose not
09:47 PM Tom_L: you will want one that does
09:47 PM Tom_L: mine has one on the back and top
09:47 PM Tom_L: for multi positions
09:47 PM eadthem: the mitutoyo is a 3/8" clamp type
09:47 PM Tom_L: fewer position options but will still work
09:47 PM eadthem: 5/32 or 3/8
09:48 PM Tom_L: make sure the hole fits the indicator
09:48 PM Tom_L: https://www.amazon.com/dp/B084C52LR6/ref=sspa_dk_detail_1?psc=1&pd_rd_i=B084C52LR6&pd_rd_w=97PbB&pf_rd_p=48d372c1-f7e1-4b8b-9d02-4bd86f5158c5&pd_rd_wg=5kL2D&pf_rd_r=099M6YY07DDV6Q21AH4K&pd_rd_r=35c49522-99bf-4cba-86ec-baa77695ef0c&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEzUTVXTzhDQ1dIVkRJJmVuY3J5cHRlZElkPUEwMzYxMjcxVUhXRkdXQkhPWDdEJmVuY3J5cHRlZEFkSWQ9QTA5NzMwNTkzUVpTSzE3MkZTSzhUJndpZGdldE5hbWU9c3BfZGV0YWlsJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9
09:48 PM Tom_L: dHJ1ZQ==
09:49 PM Tom_L: crap
09:49 PM eadthem: 6mm 8mm 3/8"
09:49 PM eadthem: i think you ment https://www.amazon.com/dp/B084C52LR6/ref=sspa_dk_detail_1
09:50 PM Tom_L: yeah see the dovetails?
09:50 PM eadthem: yep
09:50 PM Tom_L: front and back
09:50 PM Tom_L: and top
09:50 PM eadthem: but that ones .0005 grads and im mesuring .0004 +-
09:50 PM Tom_L: very versatile
09:50 PM eadthem: or thats my limit
09:50 PM Tom_L: well that's what you're looking for, just find the right range you need
09:51 PM eadthem: so you would go with a non mitutoyo or starret to get the dove tails?
09:51 PM Tom_L: full travel of the stylus is approx 1/8 to 1/4" or thereabouts
09:51 PM eadthem: that important
09:51 PM Tom_L: it's hard to beat mitutoyo
09:51 PM Tom_L: but i've also got a cheap indicator i use
09:52 PM eadthem: tbh in 8 years its the first time i needed one to fix a robot
09:52 PM eadthem: i dont plan to need it again
09:52 PM Tom_L: it's cheap enough you could try one i suppose
09:52 PM eadthem: its a big pick and place robot, bout 30,000 parts an hour
09:53 PM eadthem: sadly a screw came loose landed in the bearing track and well now were replaceing the bearing
09:53 PM Tom_L: :)
09:53 PM eadthem: first fod incident in 8 years as well
09:53 PM Tom_L: i think either one would do the task
09:54 PM Tom_L: you basically want no needle movement
09:54 PM Tom_L: pretty hard to get but that's ideal
09:54 PM eadthem: ya i suspect the intent is to make sure theres no torqe on the stator to the rotor (ironicly stator moves, rotor is stationary, nether rotate lol)
09:56 PM Tom_L: i don't know what they're called but for more precise measurement they use laser reflectors
09:56 PM Tom_L: $$$
09:57 PM eadthem: mmm dam, with my cough i doubt ile be going in to work tomarow, again
09:58 PM eadthem: seam to have the worst luck this year, first head crashes, Z decides not to retract. turret plows though some spindles
09:58 PM eadthem: then same machine later on, eats a screw.
09:59 PM eadthem: now the parts are coming in, and im home, questonably sick,
10:01 PM eadthem: any reason to go high precision or name brand on a torque wrench?
10:03 PM eadthem: well thanks tom & rue
10:04 PM rue_mohr: ok
10:08 PM Tom_L: np
10:09 PM Tom_L: there again it depends on the specs called out for the job
10:10 PM eadthem: torqe in sequence to 15 in/lbs , 80 in/lbs, 20 ft/lbs
10:13 PM Tom_L: might require 2
10:13 PM eadthem: i got the inch lbs already
10:13 PM Tom_L: dunno if in/lb scale goes to ft/lb
10:13 PM Tom_L: 20 ft/lb will be on the bottom of the scale of most so you want one accurate on that end
10:17 PM Tom_L: https://www.amazon.com/Stanley-Proto-J6168F-4-Inch-6-30-Inch/dp/B000OL9NQ2/ref=sr_1_5?dchild=1&keywords=dial+torque+wrench&qid=1585192569&sr=8-5
10:17 PM Tom_L: not necessarily that brand but that style will usually be more accurate
10:18 PM eadthem: mmm no click on that right
10:18 PM Tom_L: i don't think so
10:18 PM Tom_L: the clicks just put you in the ballpark
10:19 PM Tom_L: https://www.amazon.com/Precision-Instruments-D2F50FM-Wrench-lb-ft/dp/B0186ME0ZE/ref=sr_1_23?dchild=1&keywords=dial+torque+wrench&qid=1585192569&sr=8-23
10:20 PM eadthem: might have to check, we have a dial one at work
10:20 PM Tom_L: Accurate to 2% of the reading from 20% of full scale to full scale clockwise and counterclockwise.
10:21 PM Tom_L: so if it's 100 ft/lb the accuracy would be 2% between 20-80 ft lbs
10:21 PM Tom_L: they all fall off on the ends
10:22 PM eadthem: makes sense
10:23 PM Tom_L: you in KC?
10:23 PM Tom_L: on lockdown?
10:23 PM eadthem: yep
10:23 PM eadthem: johnson county
10:23 PM Tom_L: stay safe
10:23 PM eadthem: well were essental due to some things we make for some customers
10:24 PM eadthem: but were not running full staff, alot are working out of the building, i am due to getting a sore throat and occasional cough
10:24 PM Tom_L: yeah my kids still work due to the cnc shop having some defense contracts
10:24 PM eadthem: your in wichita if i remeber correctly
10:24 PM Tom_L: yup
10:25 PM Tom_L: i was off last week anyway
10:25 PM Tom_L: did a little this week but not very much
10:25 PM eadthem: mmm now i need to find a 8-10 inch long 5mm allen head 3/8 drive bit
10:25 PM eadthem: this shuld be fun
10:25 PM Tom_L: vacation last week to savannah and came back early due to everything shutting down
10:26 PM Tom_L: snapon should have a socket drive allen
10:26 PM eadthem: this last weekend i went to concordia to pick up a project at my dads shop. he was out of town so was able to avoid contact
10:26 PM eadthem: last thing i need is to get 1 of them sick.
10:27 PM eadthem: mmm ile prob go to kc tool for the bits
10:27 PM eadthem: will be whia or wera
10:27 PM eadthem: https://www.kctoolco.com/
10:28 PM Tom_L: https://www.amazon.com/Extra-Standard-Drive-Allen-Socket/dp/B01EC8MDFA
10:28 PM eadthem: to short and there not metric
10:28 PM eadthem: but ya i can find the bits
10:28 PM Tom_L: yeah you may not find one that long
10:29 PM eadthem: i had to make a 2mm x 6 inch bit by soldering a cut off L allen key in a 4mm to 1/4 inch adapter before
10:29 PM eadthem: course its for 3 inch lb
10:30 PM eadthem: not sure i can solder one that will handle 20 ft lb
10:30 PM Tom_L: room for a regular socket extension?
10:30 PM eadthem: no
10:31 PM Tom_L: the length will affect the torque too
10:31 PM Tom_L: not so much on that small though
10:32 PM Tom_L: so if the torque is important, don't go cheap on the allen
10:32 PM Tom_L: anyway.. gnite
10:33 PM eadthem: night thanks