Model Forum / General / Models / April 2010

I would say you will probably be OK.

You could consider getting a normal ball bearing with a C5 (larger
than normal) clearance and using it as if it were an angular contact
bearing. For a 15mm shaft the clearance is quoted as 25um vs the
standard of 5um.  It's not quite as good as an angular contact and the
geometry is not perfect, but it is a servicable route to a poor-man's
angular contact solution and is noticably smaller OD.

The only likely looking bearing I can see listed is a 61802 which is
15x24x5. A more common 6002 is 32OD so you would run out of meat.

Other alternatives could be to use a standard ball bearing with
reduced internal clarance, but you would need to ensure the adjustment
of the thrust bearing was finely adjustable or ensure the ball bearing
can float so that there would be negligible end thrust on the zero
clearance ball. A small end thrust on a zero clearance ball bearing
gives large radial loads which might be excessive.
Also you might use the existing thrust bearing and a large-ish needle
roller for the radial location - very stiff, nil clearance, high load
capacity. An NKJ15 has a 15mm bore with an inner ring and an OD of 27.
If you could run the needles direct on the shaft you could reduce the
OD to 23 with an NJ15, but you would need to harden and grind the
spindle.

Depends on how much you like tinkering, I'd probaby give it a go as is
and consider the above as a fall back if it proves a problem.

Richard

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