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LM8UU Z axis - Spring needed?

Posted by enob

enob

LM8UU Z axis - Spring needed?
February 29, 2012 02:11PM

Registered: 12 years ago
Posts: 22

Hello, I am working on switching my prusa over to lm8uu bearings. On the Z axis are you supposed to use the two nuts with a spring in between like the original? Or do you just use one nut for the bottom like on the Longboat Prusa. I guess the Longboat's instructions are confusing me. Prusa Longboat. Thanks in advance!

Edited 1 time(s). Last edit at 02/29/2012 02:54PM by enob.

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Greg Frost

Re: LM8UU Z axis - Spring needed?
March 04, 2012 07:36AM

Registered: 13 years ago
Posts: 486

With LM8uu on the Z, you can get it running pretty smoothly such that the springs arent required. Gravity will do the job for you. It helps if your rods are very parallel, and my rigid x ends can help with that (see [www.thingiverse.com] ).

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Leeway

Re: LM8UU Z axis - Spring needed?
March 06, 2012 12:11PM

Registered: 12 years ago
Posts: 18

I just found a suitabe spring I had on hand and cut it in half. Of course I had already bought 10 of them from Mcmaster Carr. smiling smiley

It works like an anti-backlash nut when you use the spring. Keeps the two nuts pressed to the outer thread and keeps from binding.