#linuxcnc Logs

Sep 21 2021

#linuxcnc Calendar

01:07 AM Deejay: moin
02:00 AM fdarling: what is a recommended VPN alternative to PIA (Private Internet Access)? As I understand, the PIA founder Andrew Lee was involved in the "hostile takeover" of FreeNode, if so, I wouldn't want to support him
02:03 AM fdarling: I have also heard that PIA was sold, and that Andrew Lee isn't involved with it anymore. Does anyone know if that is true?
02:18 AM XXCoder: dont know
02:18 AM XXCoder: but yeah get rid of services thats owned by him
03:31 AM enleth: fdarling: honestly, most of those heavily advertised end-user-targered VPNs are some kind of shady, using either botnets or their own customers as exit nodes
03:31 AM enleth: *targeted
03:32 AM enleth: if you need anonymity to communicate (low bandwidth), use tor
03:33 AM fdarling: enleth: that would be pretty easy to prove with PIA if you aren't even using their client app, but rather NetworkManager under Linux directly
03:33 AM fdarling: it's not for anonymity, it's for geo location
03:33 AM enleth: netflix?
03:33 AM fdarling: no
03:34 AM fdarling: various things, I don't end up needing it all the time, but when I do need it, it's better than Tor because you can control where you appear to be and you aren't blacklisted
04:08 AM Loetmichel: ouchouch... just cut 142 M3 threads in sheet steel with a battery drill. IN six minutes flat (5:59:97). Now my wrist hurts :(
04:08 AM XXCoder: ow heh
05:26 AM JT-Cave: morning
09:51 AM Loetmichel: **giggle** The local UPS driver is learning... just carried a delivery to his van, stating "its not that heavy" and tried to hand it to him. His response: "Set it down here, i don't fall for that trick twice! Last time you said 'maybe 20kg' and it was 53 kg! " :D
09:52 AM Eric_: what's the qtpyvcp irc channel called?
10:10 AM JT-Shop: it's on Element QtPyVCP
10:38 AM Eric_: that's not the name of the irc channel
11:04 AM Eric_: a decade later, I still haven't figured out what dust collection fittings will work with my powermatic 66 tablesaw
11:04 AM Eric_: outside is too big, inside is too small for anything I've tried
12:07 PM Eric_: I wonder if there is enough meat on one of my blast gates to turn it on the lathe
12:13 PM JT-Cave: https://pasteboard.co/Z7khGALdYDpI.png
12:15 PM roycroft: you can always attach it to the lathe
12:15 PM roycroft: you can hold it in place with a live center
12:15 PM roycroft: you can turn a piece of paper on a lathe if you fixture it properly
12:16 PM JT-Cave: I made delrin bushings to make dust collection stuff fit
12:18 PM Eric_: I was thinking about turning bushings
12:18 PM Eric_: If I can bore out or reduce the OD of the blast gate, that would be nice
01:20 PM -!- #linuxcnc mode set to +v by ChanServ
02:02 PM miss0r: 'evening
02:03 PM XXCoder: o/
02:04 PM miss0r: Anything interesting going on out there in the real world?
02:04 PM CaptHindsight[m]: JT-Cave: those image pasting site never tend to last
02:05 PM CaptHindsight[m]: https://postimages.org/ besides imgur, they are still up after a few years
02:07 PM MrSunshine_: hmm using an ac servo motor as spindle ... how does that compare to other spindles ? ive got a tool changer that i would like to use in the future .. but if the motor gives up on it i want to change it to something better, quieter
02:08 PM CaptHindsight[m]: miss0r: https://www.amerimoldexpo.com/ started today, Fabtech was last week
02:08 PM MrSunshine_: i see the rpm range isnt that great on servos tho
02:09 PM miss0r: I'm still in the repair bubble here... I've been so buzy like you would not believe it
02:10 PM CaptHindsight[m]: miss0r: what have you been repairing?
02:10 PM CaptHindsight[m]: machine parts?
02:11 PM miss0r: Mostly the usual cnc machinery.. but for whatever reason I've started to also do drill presses & other smallish machinery. They are delievered at my shop
02:11 PM CaptHindsight[m]: if it pays the same, why not?
02:11 PM JT-Shop: well on a DX32 if the door is not fully shut after a program pause and you press esc it drops you out of run but as I found out does not reset the program when you put it back in run
02:11 PM miss0r: and the gig sounded so boring, I quoted a ridiculous hourly wage to not have the work. But they accepted :)
02:11 PM Rab: MrSunshine_, I haven't tried it, but note that continuous high-speed duty is unusual for servos. You might need some kind of cooling.
02:12 PM miss0r: CaptHindsight[m]: Indeed
02:12 PM MrSunshine_: Rab, ah that is true also i guess, i would like something that can go up to like 16k rpm .. not to big of a frame (max 80mm) in diameter .. and not a chinese spindle that sounds terrible :P
02:13 PM miss0r: CaptHindsight[m]: My hourly wage doing those smallish machines is around 150usd/hour
02:13 PM CaptHindsight[m]: sounds good
02:13 PM miss0r: yeah. But theres too much
02:13 PM CaptHindsight[m]: happy to help, I need a break
02:13 PM miss0r: and the work is not satisfying
02:13 PM Rab: MrSunshine_, I have some very old DC servos (e.g. Compumotor dinosaurs) that I've considered for servos, but the power-to-weight ratio is very poor.
02:13 PM miss0r: come on over! :)
02:14 PM Rab: er s/servos/spindle
02:15 PM Rab: MrSunshine_, what's your desired power output?
02:16 PM miss0r: CaptHindsight[m]: I still do the satisfying troubleshooting job where an odd mix of small mallfunctions combining mechanical, hydraulic and electrical errors combine to do something completely new. :) Those nuts I enjoy ot crack
02:18 PM MrSunshine_: Rab, 1 - 2kw somewhere, current motor is 1kw but gives 600w and it works fine, the chinese spindle i had was 2.2kw but the bearings crapped out 2 times in it now so gave up on it :P
02:18 PM CaptHindsight[m]: miss0r: https://imgur.com/BWV48E5 had Covid so I lost a month
02:18 PM miss0r: looking good though!
02:18 PM miss0r: How are you now? (and what about after effects?)
02:19 PM MrSunshine_: brushless dc motors, are they any good for spindle drive applications ? or is it 3 phasers the best choice ? also there power to weight isnt very good imo
02:19 PM CaptHindsight[m]: miss0r: lost most of my taste and smell and hearing in one ear due to congestion
02:19 PM CaptHindsight[m]: coming back slowly
02:20 PM CaptHindsight[m]: some energy came back last week
02:20 PM miss0r: glad I've not cought it yet. and by the looks of it 'round here I won't have to
02:20 PM CaptHindsight[m]: still can't hustle for more than a few hours without getting exhausted
02:20 PM miss0r: damn
02:21 PM CaptHindsight[m]: walked around fabtech last week for a few hours, it felt like I ran 20Km
02:22 PM miss0r: damn. I'm glad you came out on top
02:22 PM CaptHindsight[m]: Pfizer back in march/April
02:22 PM miss0r: did you get two of'em or just the one?
02:22 PM CaptHindsight[m]: might have been my 3rd time getting Covid, positive it was this time
02:23 PM CaptHindsight[m]: 2 shots/ 3 weeks apart
02:23 PM miss0r: hmm. So, basically you would have kicked the bucket if you had not been vaccinated?
02:23 PM CaptHindsight[m]: i probably came into contact with someone that was really shedding virus
02:23 PM Rab: CaptHindsight[m], damn, sorry to hear that.
02:24 PM CaptHindsight[m]: possibly, only had a fever for one day, but all other symptoms except for any lung issues
02:24 PM CaptHindsight[m]: was like a month long really bad cold
02:25 PM miss0r: meh. I know what I look like when I have a common cold...
02:25 PM miss0r: That thing would've kicked my ass
02:25 PM CaptHindsight[m]: i did manage to pull an engine a do a few things
02:26 PM * miss0r with a normal cold can hardly lift a cup of fcoffee :)
02:26 PM CaptHindsight[m]: took me 3-4 hours to put an engine on a pallet and strap it down and wrap it
02:26 PM miss0r: so hats off to you ;)
02:27 PM roycroft: due to the lung scarring i have from a bout with pneumonia a few years ago there's a good chance i would not survive a covid-19 infection
02:27 PM roycroft: my plan, therefore, is to avoid getting infected
02:27 PM CaptHindsight[m]: it messed with my balance, so anything that involved twisting or looking up was way off
02:27 PM CaptHindsight[m]: good plan!
02:27 PM Rab: MrSunshine_, BLDC motors have a terrific power to weight ratio, but there are some caveats. Big motors (ebike etc) are designed for low RPMs, small hobby motors require a whole lot of current at relatively low voltage to develop full power output.
02:27 PM roycroft: i think so
02:27 PM miss0r: Yeah !
02:28 PM CaptHindsight[m]: climbed a ladder to clean AC filters, felt like i was rock climbing upside down
02:28 PM CaptHindsight[m]: have to machine some more Delrin bushings today
02:28 PM miss0r: machines are off limit to me when I am sick
02:29 PM miss0r: I would loose an arm
02:29 PM miss0r: :)
02:29 PM MrSunshine_: Rab, yeah read that .. got me thinking of treadmill motors =)
02:30 PM Rab: MrSunshine_, also they're pretty cheaply made. The magnets fall off, bearings are undersized, etc. I have a "2400W" BLDC motor driving a small spindle on my router, but I would bet power output is under 500W. I also have a 1:2 pulley ratio to boost 7krpm to 14krpm for engraving.
02:30 PM CaptHindsight[m]: miss0r: yeah i did a few dumb things, broke my parting tool, and $100 end mill etc
02:31 PM miss0r: CaptHindsight[m]: Yeah... so worth it, right? :D
02:31 PM CaptHindsight[m]: hard to concentrate
02:31 PM miss0r: yeah
02:32 PM CaptHindsight[m]: or you measure one side of a part and by the next side you forgot what you just measured or are comparing to
02:33 PM miss0r: I hear'ya
02:40 PM Eric_ is now known as unterhausen
02:40 PM unterhausen: I couldn't find a 4" blast gate, but I found my stash of encoders
02:42 PM Rab: MrSunshine_, treadmill motors are better for low speed. I have one on my drill press that maxes out around 5000 rpm (and I never run it that fast).
02:45 PM Rab: MrSunshine_, if you're doing a DIY approach, you could try a motor from a kitchen blender. 1KW @ 14krpm, no problem. https://joyofblending.com/vitamix-speed-measured/
02:45 PM MrSunshine_: Rab, well the chinese spindle had a torque of 0.7nm if i remember correctly .. so gearing it up with a belt shouldnt be a problem imo =)
02:45 PM MrSunshine_: Rab, the one i have is brushed (amb spindle) and if the brushes wears out to fast i want to just replace the motor with something more reliable in the future =)
02:57 PM MrSunshine_: seems some people had problems with brushes wearing out in hours on them .. tho i ran it for 6 hours straight running in the bearings yesterday with no problems =)
02:58 PM MrSunshine_: but a quick google search on how long carbon brushes last its 2500 - 7500 hours somewhere on general purpose machines .. so i guess it should last a bit atleast =)
02:59 PM CaptHindsight[m]: https://www.youtube.com/watch?v=DLnUagQObLw missed the memo
02:59 PM Rab: MrSunshine_, looks like AMB = Kress? Looks legit.
02:59 PM MrSunshine_: yes
03:00 PM MrSunshine_: the atc spindle with 0-10v voltage for rpm ... would like rpm feedback tho for the cnc computer
03:01 PM CaptHindsight[m]: i couldn't get very far into the video. He is like watching nails on a chalk board
03:04 PM CaptHindsight[m]: next time a party needs to be over, out comes that guys videos
03:04 PM Rab: trollface.png personified
03:04 PM unterhausen: I thought it was the electroboom guy for a second, but he's actually funny
03:06 PM MrSunshine_: was thinking of adding an piezo element to the motor to identify if its running .. if it stops when program is running estop is issued...
03:06 PM MrSunshine_: to save both machine and spindle from the steppers :P
03:06 PM CaptHindsight[m]: i didn't hear any reason why ME is dead, just reasons to be s software dev
03:09 PM unterhausen: 6 years ago every high school student seemingly decided to be a mechanical engineer. Then just as quickly it was over
03:10 PM unterhausen: I think ME should do a better job of integrating software education
03:10 PM CaptHindsight[m]: the world still needs a few good ones
03:10 PM unterhausen: software engineers are competing against a lot more people
03:11 PM CaptHindsight[m]: when software devs try to do ME you get GRBL and Reprap
03:11 PM unterhausen: the problem for me was the department head told the dean that she needed 10 more professors so he funded them
03:12 PM unterhausen: now they don't need me to teach
03:13 PM CaptHindsight[m]: unterhausen: student challenge https://forum.linuxcnc.org/38-general-linuxcnc-questions/43042-mobile-robot-system
03:13 PM unterhausen: when ME's try to do software development, you get the stuff I write :)
03:14 PM CaptHindsight[m]: trying for 1mm accuracy over 15m x 3m
03:14 PM CaptHindsight[m]: just outside the capability of most low cost sensors
03:15 PM unterhausen: we used cameras to locate out computers. You need a lot of cameras
03:15 PM unterhausen: ^our robots
03:15 PM unterhausen: it's surprising how quickly things get very small in the view of a camera
03:16 PM CaptHindsight[m]: yeah, most suggestions were for sensors with 1/10 the required accuracy
03:16 PM CaptHindsight[m]: and 1920 x 1080 cameras are almost free now
03:16 PM unterhausen: we had a motion capture system eventually that worked pretty well for $100000
03:16 PM unterhausen: system complexity grows rapidly, it's not just the camera
03:17 PM CaptHindsight[m]: do they only teach classes on using openCV or similar?
03:17 PM CaptHindsight[m]: I never see discussions of the algorithms
03:17 PM unterhausen: That's not an ME sort of thing to teach
03:17 PM CaptHindsight[m]: sure for ME's
03:18 PM unterhausen: video processing used to be the province of ME and comp scie
03:18 PM CaptHindsight[m]: but i looked at several "learn openCV" in seconds kinda videos
03:18 PM unterhausen: don't know if anyone is really teaching it any more
03:18 PM CaptHindsight[m]: huh
03:18 PM unterhausen: opencv is very nice
03:18 PM CaptHindsight[m]: I look at it like HF tools
03:18 PM unterhausen: I just haven't looked at their courses, could be someone is teaching it
03:19 PM CaptHindsight[m]: they almost work but you just need to tweak things
03:19 PM JT-Shop: just got an email from automation direct saying some of their products are going up
03:19 PM CaptHindsight[m]: yeah, what hasn't gone up in price yet?
03:19 PM unterhausen: image processing is a solved problem for the most part, academia loses interest
03:20 PM CaptHindsight[m]: prices are up as well as lead times, I'm happy when a supplier says it's not on allocation
03:20 PM * JT-Shop thinks about making the JessEmm Clear Cut mount again... I need 28.5 X travel and only have 23.785
03:20 PM unterhausen: it's like control theory, academics dropped that really quicklly
03:20 PM CaptHindsight[m]: allocation means, sold to the highest bidder
03:21 PM CaptHindsight[m]: or sold to our bigger accounts only
03:21 PM unterhausen: JT-Shop, why do you need more travel for those stops?
03:22 PM unterhausen: I want to get some of those, but where would I put my pencils?
03:22 PM CaptHindsight[m]: unterhausen: is it maybe that they just don't teach how to apply it? i see almost working systems all the time
03:23 PM CaptHindsight[m]: is application still left to on the job training?
03:26 PM unterhausen: one big problem is there isn't enough time in 4 years to teach everything, so some stuff gets dropped
03:26 PM unterhausen: the stuff that gets dropped is what isn't bringing in money for research
03:26 PM JT-Shop: unterhausen, I machined a piece of hardboard for the rail and two magswitch 150's
03:26 PM JT-Shop: so the bolt holes are 28" from front to back...
03:26 PM skunkworks: wow - I just rendered a video on my 5700g vs my laptop.. (i7) and it was 2 hours vs 6 minutes...
03:27 PM CaptHindsight[m]: software can't solve many problems, but they still think it can
03:27 PM CaptHindsight[m]: and the magic of AI
03:27 PM unterhausen: the problem is that software will always give you an answer, if you want it to
03:27 PM JT-Shop: unterhausen, that's why I used magnet mounts so I could still put my pencils there
03:27 PM unterhausen: nice
03:28 PM unterhausen: where do you put the guides when you aren't using them though?
03:28 PM CaptHindsight[m]: oooh I found a metal roll forming co that made some steel t-slot
03:29 PM CaptHindsight[m]: was one of their samples
03:29 PM skunkworks: (the 5700g was way faster - I guess a few generations newer helps?)
03:29 PM CaptHindsight[m]: was ~1.5 x 1.5" made from 16ga cold roll
03:30 PM CaptHindsight[m]: skunkworks: using the newer Ryzen stuff much?
03:32 PM skunkworks: first one...
03:32 PM JT-Shop: https://gnipsel.com/images/wood-working/saw-stop/jessem-mount.jpg
03:32 PM skunkworks: Seems pretty nice.
03:33 PM CaptHindsight[m]: https://www.reddit.com/r/Machinists/comments/pov37u/i_thought_i_turned_the_coolant_off_instead_i/
03:36 PM unterhausen: I wish I had bought a sawstop back when I could have afforded one
03:37 PM unterhausen: the PM66 was a big step up from what I had been using
03:37 PM JT-Shop: I went for a long long time with a crappy crapsman table saw
03:38 PM CaptHindsight[m]: unterhausen: do your students get access to a machine shop for projects?
03:38 PM unterhausen: there is a nice machine shop they can use
03:39 PM unterhausen: only problem is no home projects, got to have funding
03:39 PM unterhausen: the cost is minimal though
03:39 PM CaptHindsight[m]: i recall watching an early MIT ME student competition back in the 80's
03:40 PM unterhausen: the department shop is gone
03:40 PM CaptHindsight[m]: i think it was to build a machine that would collect ping pong balls off a table
03:40 PM unterhausen: if there is a class that needs it, they can use the shop
03:41 PM CaptHindsight[m]: all had the same budget and access to the machine shop
03:42 PM CaptHindsight[m]: 24 hours before the day of the competition the instructor said "they have all suddenly become very teachable"
03:42 PM CaptHindsight[m]: since their designs did not work out as planned
03:42 PM unterhausen: I usually become less teachable then
03:43 PM CaptHindsight[m]: hah
03:43 PM unterhausen: in my design course, I would make sure they were progressing okay
03:44 PM unterhausen: considering my groups won all the prizes, I was happy with my approach
03:47 PM CaptHindsight[m]: was wondering 40 years later if things are any different
03:47 PM CaptHindsight[m]: doing something right
03:48 PM unterhausen: the thing that really surprises people who wonder is that it's a writing course
03:48 PM unterhausen: it changed a lot since 1982, our senior design course was crap
03:58 PM CaptHindsight[m]: https://racine.craigslist.org/hvo/d/salem-mazak-qt15n/7378872392.html $4k is high considering that the turret is stuck
03:59 PM FinboySlick: Looks like a project.
04:00 PM roycroft: but it is old and big and dirty and heavy, so it must be worth a lot of money
04:01 PM CaptHindsight[m]: https://akroncanton.craigslist.org/tls/d/barberton-hardinge-lathe/7366044970.html $1k
04:01 PM XXCoder: and forgetting transportion costs
04:06 PM CaptHindsight[m]: about 10k lbs
04:07 PM CaptHindsight[m]: https://southbend.craigslist.org/for/d/walkerton-cnc-axislathe/7383465206.html $3k
04:08 PM CaptHindsight[m]: $900 https://sheboygan.craigslist.org/tls/d/manitowoc-metal-lathe/7382942456.html
04:16 PM FinboySlick: Never heard of Boye and Emmes. Looks a bit like a Monarch to me.
04:24 PM Rab: CaptHindsight[m], re: ping-pong balls, I weirdly remember that from pre-online days. Maybe it was publicized in Omni Magazine or something. Maybe they held the same challenge for a bunch of successive classes.
04:25 PM CaptHindsight[m]: http://vintagemachinery.org/mfgindex/detail.aspx?id=2236
04:25 PM Rab: I think one of the more successful entrants had flexible wire cages for wheels, and just trapped the balls by rolling over them.
04:26 PM CaptHindsight[m]: Rab: was on PBS or similar, i think they changed the challenge every year but rotated back after several
04:26 PM CaptHindsight[m]: FinboySlick: http://vintagemachinery.org/mfgindex/detail.aspx?id=2236
04:27 PM CaptHindsight[m]: Rab: https://www.youtube.com/watch?v=e9ijA4UBCQ0
04:29 PM CaptHindsight[m]: https://youtu.be/e9ijA4UBCQ0?t=626 winner at
04:33 PM JT-Shop: I think my key is to keep one side to the back of the vise and use a registration hole in the middle for X
04:40 PM FinboySlick: I remember a very similar contest in engineering school. It taught me not to over-complexify a design.
05:11 PM FinboySlick: CaptHindsight[m]: You reminded me of this now: https://www.youtube.com/watch?v=2V6QE0GJ-zw
05:53 PM unterhausen: the encoder I have cost $600 if I wanted another one
05:58 PM CaptHindsight[m]: I have a ton of glass scales that just need sin/cos to quadrature converters
05:59 PM CaptHindsight[m]: 1vpp and current out
05:59 PM CaptHindsight[m]: FinboySlick: are your election results all in yet?
06:00 PM roycroft: enough are in, capthindsight[m]
06:00 PM FinboySlick: So long as it stays a minority I don't care. At this point it's just minimizing the damage, not picking who gets to do it.
06:01 PM roycroft: canada has proven again that it really wants to be the usa :)
06:01 PM roycroft: california just had an unnecessary election that cost $300 million and changed nothing
06:01 PM roycroft: now canada just had an unnecessary election that cost $300 million and changed nothing
06:02 PM FinboySlick: It's only $300M in USD ;) It's more like 600 in kanukistan Kopecs.
06:03 PM roycroft: so i'd like to get back to repeatability of limit/homing switches if i may
06:03 PM JT-Shop: micro switches work fine for me
06:03 PM roycroft: i'm still far from convinced that my cheap mechanical lever type limit switches are going to be even reasonably repeatable
06:03 PM roycroft: but if used as hard limit switches, that should not matter, should it?
06:03 PM CaptHindsight[m]: nope
06:04 PM roycroft: theoretically i should never reach those switches
06:04 PM unterhausen: if you want to get crazy with accuracy, get an encoder on each motor
06:04 PM roycroft: so it doesn't matter if they're only repeatable to 0.010" or so
06:04 PM roycroft: that said
06:04 PM FinboySlick: Probably not. Though for a single run, you'll probably find the mechanical switch repeatability to be fairly decent.
06:04 PM CaptHindsight[m]: will be closer to 0.001"
06:04 PM roycroft: if i want decent repeatability, i should invest in some good switches such as proximity sensors for the homing switches
06:04 PM roycroft: and i only need three of thosse
06:04 PM roycroft: or do i need four for a gantry?
06:05 PM CaptHindsight[m]: unless if you use double sided tape for mounting
06:05 PM roycroft: at any rate, i don't need 3x that many
06:05 PM unterhausen: you can get really good repeatability combining an encoder with a crummy microswitch
06:05 PM JT-Shop: micro switches are pretty repeatable for me
06:05 PM roycroft: the $1 ones?
06:05 PM JT-Shop: more like $5 ones
06:05 PM unterhausen: the expensive ones have one of the $1 ones inside
06:05 PM roycroft: i have the $1 ones :)
06:06 PM roycroft: i bought a big bag of them for my mill
06:06 PM FinboySlick: roycroft: Well, test it, but I wouldn't just rule them out just yet, you might get fairly decent results.
06:06 PM roycroft: i have plenty to go around for anything i might build
06:06 PM roycroft: yeah
06:06 PM unterhausen: is there a good reason to have encoders with 600 lines per rev?
06:06 PM roycroft: i'm just trying to get a good idea what i might need to get, for budget purposes
06:07 PM CaptHindsight[m]: https://temcoindustrial.com/plunger-limit-switch-nc-no/
06:07 PM roycroft: proximity sensors go from about $8 each to $100 each
06:07 PM CaptHindsight[m]: https://temcoindustrial.com/electrical/relays-switches/limit-switches/
06:07 PM JT-Shop: https://www.automationdirect.com/adc/shopping/catalog/sensors_-z-_encoders/limit_switches/snap_action_micro_switches/lever_with_roller_actuator/176112-1
06:07 PM JT-Shop: ok $10 ones
06:08 PM CaptHindsight[m]: 10 pack for $27 https://temcoindustrial.com/long-lever-arm-heavy-duty-micro-limit-switch-10-pack/
06:08 PM roycroft: well those are actually $1 ones with the $9 automationdirect tax added on :)
06:08 PM unterhausen: I worked with a guy that had a large number of microswitch related patents
06:08 PM unterhausen: he was an idiot
06:09 PM CaptHindsight[m]: unterhausen: did he only understand On and OFF?
06:09 PM roycroft: they're not that bad, but almost everything they carry can be had elsewhere for quite a bit less
06:09 PM unterhausen: guys used to call me for help and I would tell them they needed to talk to Sugars and they would say that they didn't want to do that
06:10 PM roguish[m]: capt_hindsight[m]: about those Temco switches. they are identical to these on amazon. very poor quality. i know......
06:10 PM roguish[m]: https://www.amazon.com/gp/product/B07KM38PLN/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
06:10 PM unterhausen: I have some brand name MUSA limit switches and when I took them apart to clean them they had a microswitch inside
06:10 PM roycroft: i did buy a motor from them recently
06:11 PM roycroft: not everything they carry is marked up like that
06:11 PM unterhausen: If I was really worried about it, I would go with omron
06:12 PM roycroft: well i think that for use as actual limit switches, the $1 ones that i have will probably be fine
06:12 PM roycroft: and i'll do some testing to see if they are also suitable as homing switches
06:14 PM roycroft: and i presume i should mount them a bit before the actual end of travel on an axis, so that if the machine goes crazy and does an out of control rapid it will have room to stop once it hits the limit switch
06:16 PM CaptHindsight[m]: https://www.valinonline.com/products/d5a-3300 $255ea
06:17 PM CaptHindsight[m]: https://www.ia.omron.com/products/family/340/
06:17 PM unterhausen: omron has some reasonable ones
06:18 PM CaptHindsight[m]: M5 (D5A-1[][][] series), M8, slim type:1 μm max.
06:18 PM CaptHindsight[m]: M5 (D5A-2[][][] series), M16, limit type:3 μm max.
06:18 PM CaptHindsight[m]: if you want something with nanometer accuracy let me know
06:19 PM unterhausen: those are neat
06:19 PM CaptHindsight[m]: I can also build a temp controlled enclosure for the entire machine or room
06:19 PM unterhausen: wonder how they work
06:20 PM CaptHindsight[m]: more affordable versions with lower accuracy https://www.ia.omron.com/products/category/switches/limit-switches/index.html
06:21 PM roycroft: i am building a cnc router - i do not need anything approaching extreme accuracy
06:21 PM roycroft: i just need reasonable accuracy
06:21 PM CaptHindsight[m]: https://www.ia.omron.com/support/guide/30/introduction.html
06:22 PM unterhausen: heh, when I bought omron limit switches I was spending someone else's money
06:22 PM unterhausen: I remember them being $40 though
06:23 PM CaptHindsight[m]: unterhausen: https://www.baumer.com/pl/en/product-overview/object-detection/precision-mechanical-switches/c/285
06:23 PM unterhausen: I did some tests on a lion precision cap probe lvdt. It would work great as a limit switch
06:24 PM unterhausen: $10k each though
06:25 PM CaptHindsight[m]: 100 page catalog of limit switches https://www.alliedelec.com/m/d/46d5f4e2d8820b67a2224ebab550819a.pdf
06:28 PM CaptHindsight[m]: roycroft: it just settles the issue until the next election :)
06:29 PM CaptHindsight[m]: oh only ~40 days until Halloween
06:30 PM unterhausen: I drilled some holes in my bridgeport to put a prox sensor in for homing
06:31 PM unterhausen: nice thing about the bp is that it has a fairly big piece of metal that you can use to detect
06:31 PM unterhausen: someone gave me the prox switches though
06:33 PM unterhausen: I don't care too much about the accuracy, I have encoders
06:35 PM unterhausen: I have 2 encoders I could use for electronic gearbox on my lathe. 600ppr or 2048
06:35 PM unterhausen: seems like one is too little and the other is too much
06:35 PM unterhausen: but I have to multiply by 100/127
06:37 PM hazzy[m]: I didn't believe the Canadian Prime Minister got reelected. It's Trudeau.
06:38 PM FinboySlick: He's very pretty. Substance is irrelevant ;)