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Post by 3dprintingmeathead on Mar 12, 2017 15:16:50 GMT
So, I hit a little bit of a learning curve on lead screws. When I got my printer, I swore one of my lead screws was bent. I watched 1 side stay straight, bur the other side move around. Made sense to me, so I ordered a replacement pair, and while I was at it, some fancy anti-wobble couplers. Installed the new ones, and now the side that wobbled was fixed, but the side that was ok was not. Then I did that thing that hurts my head sometimes, thought about the problem. The 2 grub screw mounting system seems to be the problem. The grub screw can tighten down on either 1 or 2 threads, which affects how square the lead screw runs. By clamping down on the leadscrew evenly from all sides, it maintains alignment better. here's the STL |
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Post by Admin on Mar 13, 2017 4:56:45 GMT
I've worked with couplings for a lot of years on big 1" shafts and you never wanted to see your set screws on opposites sides of the collar because if both of them tighten the same amount then you've set them up to pivot on the tips of the set screws. When you do see two they are on some odd angle or one above the other. I was thinking of grinding a flat on one side of mine if I had problems. There is a guy who makes couplings with one side has an acme thread. www.dumpstercnc.com |
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king
New Member
Posts: 8 
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Post by king on Mar 16, 2017 19:34:08 GMT
Holy smokes those prices
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Post by kioskfan on Mar 20, 2017 22:28:33 GMT
Not cheap but actually machined out of one piece of Delrin plastic so it is more of a precision part than one made on a 3D printer. I found them while looking for parts for my CNC router which uses 1/2" acme screws and the expensive parts would still be cheaper than going to a machine shop. I haven't bought them yet but instead bought the 3D printer to make the parts for the CNC router, which I will then remake on the CNC router. Yes some people think I'm crazy to buy a machine to make another machine.  |
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Post by kioskfan on Mar 20, 2017 22:33:11 GMT
So, I hit a little bit of a learning curve on lead screws. When I got my printer, I swore one of my lead screws was bent. I watched 1 side stay straight, bur the other side move around. Made sense to me, so I ordered a replacement pair, and while I was at it, some fancy anti-wobble couplers. Installed the new ones, and now the side that wobbled was fixed, but the side that was ok was not. Then I did that thing that hurts my head sometimes, thought about the problem. The 2 grub screw mounting system seems to be the problem. The grub screw can tighten down on either 1 or 2 threads, which affects how square the lead screw runs. By clamping down on the leadscrew evenly from all sides, it maintains alignment better. here's the STLMy machine arrived with solid couplings on the lead screws, they are made from anodized aluminum and fit really nicely. Maybe it's something they just noticed and repaired .  |
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