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Customizable LM8UU graphite impregnated bronze bushing adapter

by AndrewBCN, published

Customizable LM8UU graphite impregnated bronze bushing adapter by AndrewBCN Jun 13, 2015
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Summary

After a tip by Ruff, I decided to test graphite impregnated bronze bushings to replace LM8UU linear bearings, as a way to decrease the noise from my P3Steel and Prusa i3 printers when printing.

I made a video comparing the noise of these graphite impregnated bronze bushings to that of a low cost LM8UU bearing: https://www.youtube.com/watch?v=AbSU_rI82-4

These printed adapters have customizable tolerances which can be adjusted to your specific printer to get a perfect fit of the bushings. The default values are the ones I arrived at after a few tries.

Based on http://www.thingiverse.com/thing:849572 by Ruff, and also on http://www.thingiverse.com/thing:166794 by Misan.

OpenSCAD sources are included so the thing can be further remixed. Released under the GPLV3 license.

Instructions

Here printed in PLA with 35% infill.

Requires two bushing per adapter.

These graphite impregnated bronze bushing are available from AliExpress for less than $0.35 each, in packs of 10.

I put them in the fridge for about an hour before press-fitting them in the still warm adapter.

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Jan 18, 2016 - Modified Jan 18, 2016

bonjour

vous les trouvez ou?

merci de votre partage :D


Hello

or you find them?

thank you for sharing :)

Thanks for good Idea. I design holder for similar bushings for my table here
http://www.thingiverse.com/thing:1024163

Y table on Bushings
Jun 13, 2015 - Modified Jun 13, 2015

you are quite wrong.
open the document and read what they are made.
http://www.skf.com/binary/56-107917/SKF-composite-plain-bearings---11004-EN.pdf

black - a layer of PTFE or POM.

When going from bearings to bushings you have to be much more careful about alignment. Bushings will not give you any help and if they are misaligned even slightly you will get a lot of resistance.
Do not compare/test a single bushing vs a single bearing, test e.g. the entire x carriage w/3-4 bearings against the same with bushings.
One trick that can help is to print in ABS and then use acetone to soften the plastic a lot, then run a burn-in cycle with lots of movement while the ABS hardens.

I agree with you 100%, alignment is MUCH more critical with bushings than with linear bearings. The acetone idea is a good one I think, I may have to try it soon. Thanks.

What size are those bushings so I can narrow the search for them?

Hi,
These are id=8mm, od=10mm, len=12mm.

Not finding them. Finding 8x12x10. No 8x10x12. You have a JDB number? Thanks

A quick search for "10pcs Wear-Resisting SF-1 Self Lubricating Bearing Bushing" will get you there! :)

Perfect! got em now..Thanks

Thanks!

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