Linear Brearing Quality?

[Peter BellParticipant @peterbell11509]

I use some LM10uu linear bearings on a ticket numbering machine I have made. The quality of these bearings (perhaps reflected in the price!) does not seem very good and even new ones seem noisy or notchy.

I recently noticed solid polymer replacements for these made by Igus RJM-01-10.

Does anyone have any experience of these dry bearings?

I also want to use a 10mm 300mm long leadscrew on another project and can anyone offer any guidance whether to use a ballscrew or go for a Delrin type nut or similar and single start leadscrew?

Thanks

Peter

[Peter BellParticipant @peterbell11509]

[HOWARDTParticipant @howardt]

i have used Igus bearings a lot in the past on both low speed and high speed reciprocating and rotating designs, they are very good. Make sure you look through the catalogue at the material options and choose the one that fits your criteria. They are very helpful, so maybe look and get an idea of the required criteria and your possible choice, then give them a ring.

Hope this helps.

Howard

[david homerParticipant @davidhomer12226]

Years ago I changed out ball type linear bearings for Hepco Pacific bearings in an industrial application plagued with dust problems, the Hepco are what looks like PTFE and Bronze composition and can be run dry. No doubt they will be more expensivie, info here

http://www.hepcomotion.com/product/linear-motion-components/pacific-plain-linear-bearings-and-pillow-block-bearings/

RS used to stock them.

David

[Peter BellParticipant @peterbell11509]

Thanks for the information Howards & David. I looked at the Igus catalogue and link and its quite bewildering with all that chioce!

Looks like the bushes I need are used on 3D printers and redily available so going to give them a go.

Peter

[jason udallParticipant @jasonudall57142]

Not a criticism of polymer bearings but please note these need to be constrained to achive the “fit” that meets the data sheet spec.
That is to say a carefull choice of “housing” and shaft .

That said polymer bearing although more tolerant of materials on shafts ( to get linear ball bearings happy you will need hardened/ground shaft) ..to achive the speed/friction/service life igus used to recommend anodised aluminium.

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