Re: [CAD_CAM_EDM_DRO] MiniRobo

----- Original Message -----
From: "Dennis Bohlke" <dbohlke@...>
> Sounds like you got the race with the balls from the vacuum cleaner.

From a vacuum cleaner repair shop - two bearings in a packet for 6UKP. I
was going to try to draw them but my brain isn't working well enough just
now - it wants to go to bed! Anyway, the outer race has a plain cylindrical
outside about 3/4" diameter, maybe a little more and a cup shaped inside
bearing surface. The inner race has a 1/4" bore and a 'trumpet' shaped
bearing surface which forms a flange to cover the open end of the cup of the
outer bearing. The balls obviously sit between and there is a dust cover.
Because of the cup and trumpet shaped bearing surfaces, the bearing provides
both side and end thrust and can tolerate misalignment. By fitting a collar
to a turned down portion of the leadscrew and putting one bearing each side
of it with the inner races butting up against it and then enclosing the
whole thing in a plain tube with one end solid and one having a cap with a
fine thread which screws inside the tube, you can press the outer races
together to get very close adjustment of endfloat and freedom.

Ian
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Ian W. Wright
Sheffield UK