#linuxcnc Logs

Jun 25 2025

01:02 AM Deejay: moin
04:22 AM Tom_L: morning
08:17 AM lcnc-relay: <skunkworks8841@> roycroft: https://photos.app.goo.gl/6mnRXrmvG92t9vYw7
08:18 AM lcnc-relay: <skunkworks8841@> (cnc router table)
08:20 AM lcnc-relay: <sodakaustik@> hows the taper threading situation going with G76
08:32 AM -!- #linuxcnc mode set to +v by ChanServ
08:32 AM lcnc-relay: <sodakaustik@> is it possible to make a taper thread with g76 E and L params?
08:34 AM lcnc-relay: <skunkworks8841@> I don't think so..
08:34 AM lcnc-relay: <sodakaustik@> i think i figured it out
08:35 AM lcnc-relay: <sodakaustik@> ill see if it works on the most demanding thread you can imagine
08:36 AM lcnc-relay: <skunkworks8841@> lol..
08:38 AM lcnc-relay: <skunkworks8841@> sodakaustik@ https://www.youtube.com/watch?v=ACvRilmIKDQ
08:45 AM rdtsc-w: whatever you make, also make the one-of-a-kind nut to fit it :)
08:59 AM rdtsc-w: https://forum.linuxcnc.org/20-g-code/35344-cutting-a-tapered-thread-with-g76
10:04 AM lcnc-relay: <sodakaustik@> i like rotarysmp's contribution but i do not wish to use subroutines
10:04 AM lcnc-relay: <sodakaustik@> im doing it its working...
10:04 AM lcnc-relay: <sodakaustik@> its a completely diabolical workaround but its working perfectly
10:05 AM lcnc-relay: <sodakaustik@> the only issue i have is my machine is kinda stupid
10:05 AM lcnc-relay: <sodakaustik@> But i am doing it ✓
10:07 AM lcnc-relay: <sodakaustik@> The stupidity of my machine extends to the spindle drive belt which is currently the used AC compressor belt from my 2000 e46 bmw with 4 ribs instead of 8 ribs as i designed the pulleys. So at 100% torque it squeals eardrum burstingly loud
10:08 AM lcnc-relay: <sodakaustik@> but its working.
10:10 AM lcnc-relay: <skunkworks8841@> lol.. what ever works. I am using a automotive belt for the feed belt on the monarch.
10:10 AM lcnc-relay: <skunkworks8841@> it works great
10:16 AM lcnc-relay: <skunkworks8841@> https://photos.app.goo.gl/bNrtoz4GA3rPH5pRA
10:16 AM roycroft: wood slicer blades are on sale at highland woodworking until july 12
10:17 AM roycroft: in case anyone is interested (jt might be)
10:17 AM lcnc-relay: <skunkworks8841@> roycroft: https://photos.app.goo.gl/6mnRXrmvG92t9vYw7
10:17 AM roycroft: i might be too - i'll be doing a lot of resawing starting soon
10:17 AM lcnc-relay: <skunkworks8841@> that was done on a cnc router.
10:18 AM roycroft: cool
10:18 AM roycroft: for the gantry router that i've been designing i struggled with how to implement a vertical workholding setup
10:19 AM roycroft: just because, as you may recall, i'm working on an "over/under" design - a conventional router table underneath and a cnc gantry router on top
10:20 AM roycroft: my recent experience cutting box joints with the shaper origin indicates that it is tricky to index a piece that is oriented vertically
10:20 AM roycroft: it likes to slip down while applying the clamps
10:25 AM roycroft: anyway, that's a nice looking box
10:26 AM roycroft: the joinery is really tight
10:33 AM lcnc-relay: <skunkworks8841@> dad was alway a good part time wood worker.
10:36 AM lcnc-relay: <skunkworks8841@> btw - that table is way older than me...
10:42 AM Tom_L: prehistoric ehh?
10:48 AM lcnc-relay: <sodakaustik@> https://cdn.discordapp.com/attachments/928595655344144435/1387456784834232371/20250625_183731.jpg?ex=685d6953&is=685c17d3&hm=c5beba9cd7b0bfe315af732fd9b715e082f97a495021baaf8b8bbb0fc38be9eb&
10:49 AM lcnc-relay: <sodakaustik@> https://cdn.discordapp.com/attachments/928595655344144435/1387456525143900302/20250625_183218.jpg?ex=685d6915&is=685c1795&hm=eeec8e1ee16ad0ed632533be9c8ab27c32ce2bbcdbd7e019e197c86c2028514c&
10:49 AM lcnc-relay: <sodakaustik@> 115mm diameter
10:49 AM lcnc-relay: <sodakaustik@> https://cdn.discordapp.com/attachments/928595655344144435/1387457096999632997/20250625_183857.jpg?ex=685d699d&is=685c181d&hm=f5abd59e96209215ba883ce6700b14854ac8ae5026ef577a0b23efcedcc27d69&
10:50 AM lcnc-relay: <sodakaustik@> i have no idea how i managed this with 40Nm spindle torque
10:51 AM lcnc-relay: <sodakaustik@> https://cdn.discordapp.com/attachments/928595655344144435/1387457405905932379/20250625_184012.jpg?ex=685d69e7&is=685c1867&hm=4dfb80e19918350543431ee6f5c7474ed16312e8a18c61dd16b3a13295311338&
10:51 AM lcnc-relay: <sodakaustik@> the tool is much narrower than the thread itself
10:51 AM lcnc-relay: <sodakaustik@> i had to do it in several passes
10:51 AM lcnc-relay: <sodakaustik@> ofsetting the tool to the right
10:52 AM lcnc-relay: <sodakaustik@> the reason of is less load
10:53 AM lcnc-relay: <sodakaustik@> now the second challenge
10:53 AM lcnc-relay: <sodakaustik@> https://cdn.discordapp.com/attachments/928595655344144435/1387457951253663835/20250625_184219.jpg?ex=685d6a69&is=685c18e9&hm=80a98a5db1fe7d91fb2040313bdd326d67ee86d32814d279202e5a7364303a84&
10:54 AM lcnc-relay: <sodakaustik@> 3/8-40 UNS
10:55 AM lcnc-relay: <sodakaustik@> the large thread was quite the challenge
11:00 AM lcnc-relay: <skunkworks8841@> Tom_L: https://photos.app.goo.gl/TEED57pR8yjLGGhA9
11:12 AM JT-Shop: pretty good looking chow
11:15 AM lcnc-relay: <skunkworks8841@> bacon/eggs and pancakes.. Sully was making peanut butter balls. pure sugar..
11:16 AM lcnc-relay: <skunkworks8841@> peanut butter, light corn syrup, powdered sugar and powdered milk..
11:17 AM JT-Shop: sugar buzz
11:23 AM JT-Shop: nap time here
11:41 AM Tom_L: yum
11:41 AM Tom_L: yeah lunch then nap for sure
12:14 PM lcnc-relay: <skunkworks8841@> you would think the peanut butter balls would be sticky - but there must be enough peanut butter that the oil trumps the sticky
12:25 PM lcnc-relay: <skunkworks8841@> hey - my pi pico kit arrived.
12:31 PM roycroft: dinner tonight should be interesting
12:31 PM roycroft: we're going to a new fusion mexican-korean restaurant
12:32 PM roycroft: those are all the rage these days
12:32 PM roycroft: think burritos with kimchee
12:39 PM JT-Shop: I put a bit of sugar on my peanut butter sandwich to keep it from being sticky
12:51 PM lcnc-relay: <sodakaustik@> why do i get so much better results when using torque mode spindle than speed mode
01:15 PM lcnc-relay: <sodakaustik@> i cant tune the drive very well in sensorless vector control, its a lenze i550. It always seems to oscillate at some frequencies due to belt stretch. My motor is very low inertia and the spindle is quite high inertia which i think is also a problem. So i rectified this by using the drive in torque mode
01:16 PM lcnc-relay: <sodakaustik@> but this scares me. If a belt breaks or the encoder dies it will cause a runaway, which can become quite dangerous
01:42 PM rdtsc-w: e-stop nearby right? :) wonder if possible to do spindle > 6000 --> estop loop
01:52 PM lcnc-relay: <sodakaustik@> i need to get an output from the vfd if max speed has been reached
01:52 PM lcnc-relay: <sodakaustik@> the problem is im scared it might fling a part one day
01:52 PM lcnc-relay: <sodakaustik@> and 5000rpm might not be nice
01:53 PM lcnc-relay: <sodakaustik@> but yes, Estop turns off all outputs and applies the physical brake on the spindle which should be good
03:11 PM roycroft: https://www.youtube.com/watch?v=zbkruyjOx9Y
03:11 PM roycroft: for all you star trek fans who also love bluegrass music
03:12 PM xxcoder: also star trek https://media.discordapp.net/attachments/343070336084082708/1387483101902671953/image0.png?ex=685d81d5&is=685c3055&hm=e60a183c433c0ce8cdd7e04f4f404e75eeadf82e2bba1951963d5f0b4dce7f52&=&format=webp&quality=lossless&width=889&height=933
03:13 PM roycroft: my link is better
03:13 PM roycroft: the url is shorter :)
03:14 PM xxcoder: lol
03:14 PM lcnc-relay: <skunkworks8841@> Peter - when you get a chance - if the servo thread can take almost 1ms - how long shold the dpll be set to?
03:15 PM lcnc-relay: <skunkworks8841@> (for a 2ms servo thread)
03:15 PM roycroft: btw, when i was retrieving stuff at my storage unit yesterday i grabbed my picard hammers
03:15 PM roycroft: i've missed them
03:15 PM lcnc-relay: <skunkworks8841@> I am getting about +/-.0001 following error...
03:16 PM lcnc-relay: <skunkworks8841@> make it so?
04:06 PM lcnc-relay: <skunkworks8841@> Hmm.. the wiki is down?
04:29 PM ziper2: I don't understand annual calibration, at all. Why would annual calibration of a pair of calipers matter when someone could've dropped them last week? Why wouldn't checking it with a gage block every time you use it not be more than sufficient?
04:30 PM Tom_L: skunkworks he had me set that to 200
04:30 PM xxcoder: it comes down to shop certifications
04:31 PM xxcoder: my calipers, mics, and dial test indictors was all certified all years I worked in shop
04:31 PM xxcoder: its long expired now but yeah
05:03 PM ziper2: right, but why
05:03 PM ziper2: sure, the tools that are used to *set* the calibrations ought to be inspected on a regular basis
05:03 PM xxcoder: some contracts require it
05:03 PM xxcoder: in my case, it was boeingb
05:03 PM ziper2: but it isn't like a vernier caliper ever gets adjusted
05:04 PM xxcoder: one of those ISO certifications require all measuring tools to be certified
05:04 PM ziper2: sure, but it seems like a baseless requirement that doesn't actually improve the accuracy or repeatability of products
05:07 PM xxcoder: well it can and do catch faulty measuring tool
05:07 PM Tom_L: periodic certification is very common in aero
05:07 PM xxcoder: my first dial caliper failed 3rd year certification because it lost ability to keep zero and drafts around
05:08 PM xxcoder: I have never dropped it
05:08 PM Tom_L: even though they come certified from mitsutoyo they won't accept that and must be certified by a local lab
05:08 PM xxcoder: indeed
05:41 PM Unterhaus_ is now known as Unterhausen
05:56 PM lcnc-relay: <skunkworks8841@> iso thing. Some companies won't work with places that are not iso certified.
05:56 PM xxcoder: indeed. whats also fun is material with expiring date. like alum blocks
05:58 PM xxcoder: alum is still alum, but without certification thats current, you cant use it for making aero parts
05:58 PM xxcoder: not all parts require it, but few do
05:59 PM xxcoder: if I recall right, it was missle part, and shop couldnt make it and utterly failed. so they had bunch of blocks expire lol
06:03 PM xxcoder: to be fair, it was extremely complex part with tight tols all over
06:06 PM lcnc-relay: <ccatlett1984@> I'm assuming that has something to do with the oxidation layer that forms on aluminum over time.
06:07 PM xxcoder: dont know, part would be still inside block
06:07 PM xxcoder: its just bunch of raw alum blocks, not made into parts yet
06:08 PM lcnc-relay: <ccatlett1984@> I'm not sure on the metallurgy, but I'm assuming the longer it sits, the deeper the oxidation goes.
06:08 PM xxcoder: yeah. block was hmm about foot cube
06:08 PM lcnc-relay: <ccatlett1984@> All I know is, laser welding aluminum is a right pain in the ass.
06:08 PM lcnc-relay: <ccatlett1984@> You have to dump in a lot of power to burn through the oxidation layer, and once you're through it the rest of it melts like butter.
06:09 PM xxcoder: oxide arent getting that deep into part which would have had been quite a bit smaller
06:09 PM lcnc-relay: <ccatlett1984@> I agree with the reality of your statements, but reality doesn't come into play many times when dealing with certifications for things.
06:09 PM xxcoder: yeah. I suspect in this case, its just inspection certification that expires, not material
06:10 PM xxcoder: they probably would have bought blocks in for re-inspection if shop was successful on parts, and material happened to expire
06:11 PM xxcoder: parts was insane though. it had way too many features lol
06:11 PM xxcoder: I'd not be surpised if they told me it had 100 features
08:33 PM ziper2: no, oxidation is only a few angstroms deep. Aging could change, I suppose
09:07 PM xxcoder: huh
09:07 PM xxcoder: roycroft: seems freecad will have woodworking addon
09:07 PM xxcoder: end of page https://blog.freecad.org/2025/06/25/wip-wednesday-25-june-2025/
09:11 PM xxcoder: it shows interesting range of stuff designed in cad. like table, drawers, display shelves with some doors, etc
09:19 PM rdtsc: who wants a MODEM for their cnc? worth 1150 USD! https://www.ebay.com/itm/196892852394 heheheheh
10:56 PM roycroft: that looks somewhat interesting, xxcoder
10:56 PM roycroft: what i really need for woodworking is a good, robust joinery package
10:57 PM roycroft: i'll have to peruse the woodworking workbench to see how string it is with that
10:57 PM xxcoder: the git has links to joinery stuff in freecad woodworking
10:57 PM xxcoder: https://www.youtube.com/playlist?list=PLSKOS_LK45BBG8kJ2AZvQKBfOSfzhTrLt
10:58 PM roycroft: yeah, i know there are some videos
10:59 PM roycroft: i'll try to watch the pertinent ones soon
10:59 PM xxcoder: videos is bit annoying, guy seem to be using underspecced pc for cad
11:01 PM * roycroft scored tickets to see lyle lovett and his large band on friday night, so pizza night will be postponed, and shop projects temporarily interrupted
11:03 PM roycroft: those videos are tiny, xxcoder
11:04 PM roycroft: it may not be the pc, but the compression
11:04 PM xxcoder: tiny in what way? ahh interesting
11:04 PM roycroft: like <100MB in size
11:05 PM roycroft: looking at the titles, the worbench may be semi-useful
11:05 PM roycroft: it all depends on implementation
11:06 PM xxcoder: theres lot more playlists too in git site
11:07 PM roycroft: i'm in the middle of my timber frame roof design for the shop
11:07 PM roycroft: i've been doing it in solidworks
11:07 PM roycroft: the joinery is pretty tedious
11:10 PM xxcoder: I bet
11:14 PM roycroft: the korean-mexican fusion place was pretty good, btw
11:14 PM xxcoder: yeah? interesting
11:15 PM roycroft: mostly yes
11:15 PM roycroft: the kimchee salsa was boring
11:15 PM roycroft: but all the other stuff was really good
11:35 PM xxcoder: well glad you enjoyed it