Interesting... the ABEC scale, I'm learning, is really about the
dimensional tolerances of the bearing.? From the :
"The ABEC
rating does not specify many critical factors, such as load
handling capabilities, ball precision, materials, material
Rockwell hardness, degree of ball and raceway polishing,
noise, vibration, and lubricant."? So
there's plenty of room for an ABEC7 to be rougher turning than an
ABEC5.
-Les
On 9/17/19 11:02, Keith N wrote:
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Funny you should bring up the subject of bearings.? I've been
wrestling with my older G11 for some time now and was (or maybe
still am) on the edge of moving on from this mount as the hobby
has become the mount.? I'm no longer trying to tame the large PE
(10" peak to peak with OPW that nothing I try seems to reduce)
since this is not what affects guided imaging, but instead have
been trying to get rid of very noisy tracking - rapid RA changes
on the order of 1.5-2" over a few seconds that guiding can't keep
up with.? I tried Belleville, different high-precision worm,
McLennan gearboxes, etc, etc, etc.
Well finally last evening I tracked this down to the new (repeat
NEW) ABEC7 bearings from Boca I had installed some time back.?
When I removed the worm and rotated it while holding on to the
bearings, I could feel they were not as smooth as both the ABEC5 I
had on hand (can't recall vendor) or the stock Losmandy bearings
that came with the OPW.? Sure enough last night I finally tested
on the scope and the tracking is much more well behaved after
putting in the ABEC5.
So takeaway is that ABEC7 in and of itself does not mean better.?
I could have just a bad sample (replaced both though probably only
one was bad).? So best to probably order many and cherry pick the
good ones.
Keith
