Re: [ATM] roller bearing vs Slider bearings

["Don Clement" <don_clement@charter.net>]

Even hard-anodizing is only a few mils thick and does not always stand up to
extreme stress of the line or point contact "singularity" of a roller
bearing. I prefer to use hardened stainless steel strip bonded to aluminum
or MDF backing. Also "way" wipers are essential to keep dust and grit from
beneath the stone crushing roller bearing wheels. One only has to look at
the tracks left from the "stone crushing" open roller bearing design on the
popular crayford to see the effects of dust and grit contamination.
Hard-anodizing or hardened SS won't prevent an open, exposed roller bearing
design from performance degradation due to dust and grit contamination.

Don Clement
Running Springs, California



Tony wrote:
I've had success combating the contact stress and galling issue by using a
hard anodised surface on a hard temper (T6 or T9) alloy like 6061 or 6082.
It is important to control the load on the roller bearing to manage this
stress.

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