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SkunkDuster posted:I was running my 7x14 Chinese mini lathe with my head up my rear end and had a crash which took a tooth away from one of the M1 Z80 gears that control the feed when the half nuts are engaged. I've checked McMaster, Little Machine Shop, and Grizzly and can't find a replacement. The closest thing I've found is this pair of 90(20)/80 gears that replace the existing 80(20)/80 gears. This will slow down the feed rate a bit, and I'm perfectly fine with that, but they cost $40. If I can find a direct replacement for $5 or so, I'd rather go that route. Yo, I run all 3D printed change gears in my 7x14 Chinese mini lathe. They're totally fine for all my aluminum threading. I've crashed it, and the keyways strip out really nicely, saving the rest of the machine. It's a feature. Also, I can print literally any tooth count, I have unlocked arbitrary thread pitches.
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Dec 23, 2022 09:09
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| # ¿ May 13, 2024 11:57 |
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I use PETG for everything. I'm sure other materials would work fine, too.
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Dec 23, 2022 18:34
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SkunkDuster posted:What are you using for your 3D printer and design software? OnShape and a Prusa i3. Any CAD software is fine, or if you like, I could just send you a set of STLs or my parametric gear generator file in OnShape.
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Dec 23, 2022 21:21
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I was actually going to throw them up on Thingiverse, but of course someone else has already done a great job: https://www.thingiverse.com/thing:180038
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Dec 24, 2022 02:28
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Do you have any specific suggestions for casting materials? The whole point of the 3D printed change gears is that they're quick and dirty and Good Enough so I'm not that interested in casting for that application. But for other stuff, I'm very intrigued
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Dec 27, 2022 22:06
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My understanding is that the starting surface will remain essentially unchanged during anodization. So, get it looking exactly how you want beforehand, and then you should be good. Polishing afterwords will gently caress up the finish. Someone correct me if wrong, I am a few months away from trying this for the first time
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Jan 12, 2023 20:19
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I have one in my living room right now, that I've been trying to get going. Long story. Gonna get it to play the knife game
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Jan 25, 2023 22:55
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That's a hell of a long skinny boring bar. You don't happen to have an EDM machine kicking around?
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Feb 7, 2023 21:04
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Get tube slit a long triangle down the side, hammer into cone
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Feb 8, 2023 02:06
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drat that's a really overbuilt 3D printer filament reel holder
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Mar 5, 2023 01:52
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Dude, thread pitch standardization didn't even exist until the 1940s
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Apr 30, 2023 03:03
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There's only a tiny chance that they're non standard gears. If you google how to reverse engineer nylon printer gears, I bet you'll be able to find some guide on getting the critical measurements to spec new ones.
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Jun 20, 2023 21:26
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Oh hello, may as well jump on the alloy and tempering chat. I've been tirekicking a project that needs a flexspline for a few years. My best understanding is that SS 304 is the material to use. Additionally, my understanding is that it will be nonmagnetic, and then when I machine it, it will probably work harden, and then become magnetic. And then I need it slightly springy still, so I will need to temper it, in which case it will be nonmagnetic again. Metal Supermarkets lists SS304, and then when I requested it, this is what's listed on the invoice:  It's a huge pain to lathe. And it's magnetic afterwards.  For tempering, my understanding is that I need to get it to 1850-2050F in a hydrogen oven. And then air cooling slowly. Which, lol, I don't have, I'm not doing that. I do have a regular heat treating oven, though. So what's the worst that can happen.  It's this:  I've never seen stainless steel oxidize before. So anyway, I tried it again, this time with wrapping the pieces up in steel foil, with a little bit of wood to try and pull all the oxygen out. This was a bit of a hail mary, and it didn't work. It's possible it could have maybe worked, but I hosed it up? Idk the foil was sharp as hell and I bled all over it too  This is a pretty meandering journey over about two years and it's pretty clear I have no idea what I'm doing. If there are any suggestions, I'm open to it.
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Aug 31, 2023 21:28
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meowmeowmeowmeow posted:A513 is a normal rear end carbon steel usually used for low-load tube structures, and is not 304 stainless. That was one of the many thoughts I had. I certainly know what I told them, but they also are extremely casual about the poo poo they actually write down, I've noticed.
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Aug 31, 2023 22:06
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How many holes? Just file it
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Dec 12, 2023 01:32
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I use superlube, because it doesn't smell like anything. And even WD40 is too strong smelling for my living room. It's weird how context changes things like that. WD40 smells great in the machine shop. Bad in the home.
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Mar 11, 2024 07:49
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| # ¿ May 13, 2024 11:57 |
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Have you tried liquid nitrogen?
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Mar 15, 2024 20:24
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