#linuxcnc Logs

Feb 18 2022

#linuxcnc Calendar

02:11 AM Deejay: moin
04:28 AM miss0r: goodmorning
04:29 AM miss0r: My smps project i'm working on.. hehe, last night I did a test where I supplied it with a constant current of 5 amps.. It generated so much electrical noise that the computer aprox 1 meter away started switching between windows and scrolling up and down. This is why I am now looking into RC & RCD filters to hook it up with, as it will ultimately be supplied with 50 amps :D
05:01 AM Tom_L: morning
05:01 AM Tom_L: 12°F
05:05 AM Snelweg: list
06:24 AM JT-Cave: morning
07:27 AM JT-Cave: yippie my 7i92 Configuration Tool will build a working configuration for a 7i76
08:22 AM perry_j1987: mornin
08:37 AM -!- #linuxcnc mode set to +v by ChanServ
09:29 AM perry_j1987: quiet this morning
09:36 AM * JT-Shop is cleaning poop
09:36 AM * roycroft is moving websites to a new server
09:47 AM perry_j1987: im putting a new 3d printed pulley on the mini lathe motor
09:47 AM perry_j1987: melted the first one from yesterday
09:47 AM perry_j1987: too tight lol
09:48 AM perry_j1987: got 4 more printed up to get me through till i find metal ones
11:00 AM solarwind: Any recommendations for a cheap old transformer welder that can run 6010?
11:01 AM solarwind: None of my modern machines can run it, except the PowerTIG 325EXT, and too just barely. Not good enough for practicing whip and pause
11:01 AM solarwind: One of the very few times I can say "It's not me, it's the machine!"
11:43 AM unterhausen: perry, I'm told ad nauseum that printed gears don't work
11:44 AM XXCoder: long term not likely
11:45 AM XXCoder: but if you really need one and order is month away
11:49 AM unterhausen: problem is I can't really get what I need, and anything close costs $200
11:50 AM unterhausen: but now I'm thinking about using a tooth sensor on the existing timing belt
11:50 AM XXCoder: sucks. cant make one?
11:50 AM unterhausen: if I got my mill working and a 4th axis, I could
12:06 PM roycroft: go watch some clickspring videos, meditate a bit to center yourself, pull out a jeweler's saw and some small files, and let a gear emerge in your hands
12:06 PM unterhausen: maybe I'll adapt what's on the lathe already. going to be weird to have an encoder with an H series timing pulley on it
12:07 PM unterhausen: I used to have 2 pulleys I made in industrial processes class. It was the only engineering class I ever flunked
12:07 PM unterhausen: but I was happy to take the shop lab part over again
12:08 PM unterhausen: I'm going to spend some quality time on the misumi site and see if they have anything
12:14 PM unterhausen: huh, bore is 60.325 mm, so a 60mm would work probably
12:23 PM solarwind: And how is it that MIG produces so much "smoke"?
12:23 PM solarwind: I can't use a fume extractor like I do for SMAW, because I'm worried it'll mess up the shielding gas
12:24 PM solarwind: The spatter I understand, sure, but what the hell is actually producing the smoke that accumulates after a while?
12:24 PM solarwind: Is it the silicon in the ER70S-6 wire?
12:26 PM unterhausen: I hope you are using proper ppe
12:31 PM unterhausen: has anyone ever seen Kent Vandervelden on any lcnc community forums?
12:35 PM solarwind: andypugh (or anyone else): If I weld a bead on a flat plate, it will warp and bend as the weld cools. Now if I put it in an appropriate oven to anneal/stress relieve, what will happen?
12:36 PM solarwind: Will it retain its shape, go back to being flat, or warp in a different way albeit without any internal stresses?
12:36 PM unterhausen: you might have to heat bend it back
12:36 PM solarwind: That's fine, I'm more trying to understand the metallurgy here
12:37 PM solarwind: So essentially the weld bead caused the base plate to bend, hopefully still within its yield strength
12:37 PM solarwind: If it's beyond the yield point, then there's permanent plastic deformation and it makes sense that it would retain its shape after stress relieving
12:38 PM solarwind: I know it's more complicated than that because the local weld causes a molten puddle so it's not as simple as a mechanical fixture causing a bend and it's now a solid piece with different sections of it at different stress points
12:39 PM solarwind: Peening the weld bead would be the right thing to do, but assuming I don't do that, what happens to the overall shape after annealing?
12:41 PM solarwind: I did some simple tests and after causing warping with excessive heat, I cut out the welded section of the plate with a plasma cutter and the rest of the plate became flat again. But this was reasonably far away from the heat affected zone. Like about 3cm radius from the weld bead. That means everything outside of that was well within its yield strength
12:42 PM solarwind: I don't have a heat treat oven yet, but that's the next thing on the to do list
12:51 PM unterhausen: I wish I understood the metallurgy too, not sure how to search the literature
12:51 PM unterhausen: it can be a real pain when brazing steel bike frames
12:52 PM roycroft: if you pre-heat the parts before welding you'll generally have less warping
12:52 PM unterhausen: how about "microstructure changes due to heat distortion" ?
12:53 PM roycroft: and while it will contribute to internal stresses, if you fixture the plate so that it cannot move, i.e. clamp it down to the welding table, and keep it fixtured until the weld bead cools, you can all but eliminate warping
12:53 PM unterhausen: that was a good search term. "microstructure evolution"
01:02 PM JT-Shop: hmm fixing to drill and tap some 1/2" steel with M5
01:03 PM Tom_L: cnc or manual
01:03 PM Tom_L: ?
01:04 PM JT-Shop: the vmc
01:06 PM Tom_L: blind or thru?
01:06 PM JT-Shop: though
01:07 PM JT-Shop: only going in 0.4" with the tap lol
01:07 PM Tom_L: piece of cake
01:07 PM unterhausen: I guess I'll do the h series timing pulley, lots of things will be easier that way
01:22 PM solarwind: Yeah preheat to reduce warping definitely makes sense
01:22 PM solarwind: I preheat as hot as possible
01:23 PM solarwind: Technically if you preheat to melting temperature, or a hair below, there will be zero warping :P
01:24 PM solarwind: For smaller parts that are TIG welded, I weld in such a way as to spread the stress out on both sides equally so the warping cancels itself out. That really should be peened and stress relieved though
01:25 PM solarwind: Like a corner joint gets an outside corner joint weld as well as an inside fillet weld
01:26 PM unterhausen: 28 tooth h series timing pulleys are shockingly expensive
01:26 PM solarwind: Especially on aluminum where the filler metal is really weak and welding ruins the temper
01:29 PM unterhausen: not too bad on ebay, $37
01:29 PM solarwind: I just spent $100 on a 20kg spool of 1.2mm ER70S-6
01:29 PM XXCoder: remember that scale changes by person unterhausen. 37 is essentally unaffordable for me now
01:31 PM unterhausen: well, how about $160
01:31 PM unterhausen: mcmaster has a lot of options starting around $90
01:32 PM unterhausen: place in the uk has one for $22, as much good as that does me
01:37 PM roycroft: have you checked at b&b, unterhausen?
01:37 PM roycroft: bbman.com
01:38 PM roycroft: i've bought from them before, and while they're not cheap, they make a lot of gears in unusual configurations
01:41 PM unterhausen: well, their cheapest is $66, better to go with ebay
01:42 PM unterhausen: or hopefully I can repurpose the idler
01:45 PM roycroft: as i said, they're not cheap
01:45 PM roycroft: their products are made in usa, which is one reason they're not cheap
01:45 PM roycroft: but i think them more as a place to go when i don't find what i need elsewhere
01:45 PM roycroft: not as a primary source
02:00 PM unterhausen: I didn't have any trouble buying what I need, but they are all expensive
02:00 PM unterhausen: I expect most h series timing pulleys are US made
02:03 PM * roycroft hopes for the day when almost everything can be had us made again
02:13 PM unterhausen: I'm offering the ebay guy $30, but now you have to set up payment before you know if your offer is going to be accepted
02:20 PM unterhausen: at least with an h pitch belt, you know the encoder can have a lot of drag and not affect anything
02:28 PM roycroft: since when on that policy?
02:28 PM * JT-Shop ponders how to jig up the next parts so they remain in the same plane..
02:28 PM roycroft: i don't mind it - it actually saves me some time, as i don't have to log back in and pay if an offer is accepted - but i've not experienced it before, and i had a best offer accepted not too long ago
02:29 PM roycroft: i just ordered some vacuum hold down pads from rockler
02:29 PM roycroft: they have a nice little set of 2 for $60 including tubing, and it's their founder's day sale, so i got them for 20% off + free shipping
02:29 PM roycroft: i had been holding out for the festool vacsys, but that thing is wicked expensive, and now it's discontinued
02:30 PM roycroft: i actually made some vacuum clamping pads, but they haven't worked out as well as i'd like
02:31 PM unterhausen: I don't know if it's for all best offers or just an option. Can't make myself sell on ebay nowadays
02:32 PM unterhausen: I have made very reasonable best offers to people that got turned down, so going through 2fa for naught will be annoying
02:32 PM roycroft: a lot of folks never accept best offers
02:32 PM roycroft: like if you offer $0.01 below their asking price they'll reject it
02:33 PM unterhausen: yeah, it's an option so why do they offer it?
02:33 PM roycroft: i suspect they only entertain offers to see what people are willing to pay
02:33 PM unterhausen: maybe
02:33 PM roycroft: so that if they have to relist they can set a more realistic price
02:33 PM roycroft: but it may also be the same thing that i suspect of many craigslist listings - that they really have no intention of selling, and may not even have product
02:34 PM unterhausen: when I list something on ebay I'm mostly just happy to get rid of things
02:34 PM unterhausen: this offer wasn't auto-rejected, which is a good start
02:34 PM roycroft: those listings are like those cuban number channels on the short wave radio - secret codes for mobsters and spies
02:34 PM unterhausen: money laundering
02:35 PM roycroft: something like that
02:35 PM unterhausen: offer $10000 for a $34 listing
02:35 PM roycroft: it's the implausible explanation that actually makes the most sense
02:35 PM unterhausen: there was one buy it now I thought was way too low
02:35 PM unterhausen: felt sorry for the person
02:36 PM unterhausen: but I was going on a trip and couldn't buy it
02:36 PM roycroft: the national archives just announced that some of the material in the boxes retrieved from mar-a-lago were classified
02:36 PM unterhausen: was going to have to drive to philly to pick it up
02:37 PM roycroft: so now the doj are involved
02:37 PM unterhausen: That was announced a while back, maybe this is official?
02:37 PM roycroft: it was suspected earlier
02:37 PM roycroft: it was just confirmed today
02:37 PM unterhausen: okay
02:37 PM unterhausen: were the documents listed on ebay for best offer?
02:38 PM roycroft: and there's only one thing that can be said about that
02:38 PM roycroft: but her emails!
02:38 PM unterhausen: yeah
02:38 PM XXCoder: yep
02:38 PM * roycroft feels bad for finding humor in our democracy going down the toilet
02:38 PM roycroft: (maybe literally)
02:39 PM unterhausen: well, he also got rid of docs down the toilet
02:39 PM unterhausen: we know this because they got stuck
02:39 PM roycroft: allegedly
02:39 PM roycroft: anyway
02:39 PM unterhausen: you don't expect the wh plumber to read the docs, do you?
02:39 PM roycroft: don't they call joe the plumber to fix that kind of stuff?
02:40 PM roycroft: i am on lunch break, and have board meetings tonight
02:40 PM unterhausen: as old as the plumbing in the wh is, I imagine they have a plumber on staff
02:40 PM roycroft: i should probably to get some cad work done while i'm at lunch
02:41 PM XXCoder: tearing paper is what he did certainly, tiolet dunno, Id not be surpised but no real proof he actually did it
02:42 PM unterhausen: I imagine he was used to doing that and just kept at it in the wh
02:42 PM XXCoder: probably
02:42 PM unterhausen: especially after being told he couldn't
02:45 PM unterhausen: andy made a din rail holder for the mesa thc. I want to respin it for the 7i73
02:45 PM JT-Shop: I make them
02:46 PM JT-Shop: https://mesaus.com/product/7i73-din/
02:46 PM unterhausen: I don't just want to order that
02:46 PM unterhausen: thought about it though
02:47 PM JT-Shop: the green din rail thingies come in a bag of 200...
02:47 PM unterhausen: since I have hoarded all the 7i73, maybe I should
02:47 PM JT-Shop: lol
02:47 PM * JT-Shop should do a bit of work
02:48 PM perry_j1987: raised the lathe by 5 inches
02:49 PM perry_j1987: back feeling much better today lol
02:57 PM XXCoder: nice
04:48 PM Stephan[m] is now known as StephanBeer[m]
05:02 PM unterhausen: well, I managed to get andy's part into a solidworks sketch
05:04 PM unterhausen: Ce n'etait pas facile
05:14 PM _unreal_: what kind of a part?
05:46 PM unterhausen: din rail mount for a mesa circuit board
05:49 PM unterhausen: I made it so I can make the distance between holes configurable
06:01 PM JT-Shop: do you want the solidworks file for it
06:02 PM unterhausen: sure
06:02 PM roycroft: speaking of sw, the guy with the laptop and the sw license and i have agreed on a price for the license
06:03 PM roycroft: so now it's a matter of logistics - we have to find a time to meet up so he can transfer the license to me and i can make sure it works
06:03 PM XXCoder: what part? curious heh
06:03 PM JT-Shop: email?
06:04 PM Tom_L: XXCoder, din rails
06:04 PM Tom_L: mounts
06:06 PM XXCoder: ahh cool
06:07 PM JT-Shop: https://mesaus.com/product/7i73-din/
06:07 PM roycroft: i just ordered a foot pedal switch for my vacuum veneering/clamping setup - that will be nice
06:08 PM roycroft: sanding and chamfering/filleting is going to go so much faster when i start using vacuum clamps to hold the workpiece down on the bench
06:09 PM XXCoder: jt nice. I guess model is for planning such layouts
06:10 PM JT-Shop: he wants to make them
06:11 PM XXCoder: ahh ok
06:11 PM Tom_L: i made a model for an all plastic one a guy printed for me
06:12 PM Tom_L: i forget what it was for now... something besides mesa
06:12 PM JT-Shop: cool
06:12 PM * JT-Shop wanders inside
06:51 PM unterhausen: JT, I think I will skip it, thanks for the offer though
06:52 PM unterhausen: XXCoder, I'm changing this to fit the 7i73 https://www.thingiverse.com/thing:4018328
06:53 PM XXCoder: looking
06:53 PM XXCoder: interesting
06:53 PM unterhausen: If I had known about JT's part when I was ordering I would have gotten those
06:54 PM unterhausen: I may still if my parts come out crummy
07:05 PM XXCoder: lets see :)
07:06 PM unterhausen: you might think that it's impossible to burn green beans
07:08 PM XXCoder: anything is possible with some work
07:23 PM unterhausen: huh, mesa uses 'murican units
07:23 PM Tom_L: is there anything else?
07:24 PM unterhausen: it's all metric nowadays
07:25 PM unterhausen: u.s. customary units are just a thin veneer over the metric system so we don't think too much about how we could never make it back to the moon
07:29 PM Tom_L: get with the program... it's mars now !
07:30 PM XXCoder: techinically imperial is metric. they defined one inch to certain length in metric
07:32 PM unterhaus: I volunteer to work for free to send all those billionaires to mars
07:32 PM unterhaus: but bezos just said that it's basically going to be the other way around
07:34 PM unterhaus: If you tried to land something on mars with u.s. customary units it would miss by a factor of 32.2
07:34 PM unterhaus: 'cause nobody knows where that 32.2 goes
08:30 PM roycroft: and gingrich the newt is who we want to land on mars, so we need to figure out that 32.2
08:30 PM roycroft: i'm not a horrible person
08:30 PM roycroft: i don't want him to be lost in space
08:30 PM roycroft: i want him to land on mars
08:30 PM roycroft: what he does when he gets there i don't care
08:31 PM roycroft: but he wants to go
08:39 PM unterhaus: if we set up a gofundme, we can do it
10:03 PM unterhaus: my model isn't quite right, doesn't fit on a 35mm din rail