[ARC5] Cleaning ball bearings

[J. Forster]

Here are a few observations about bearings.

The grease may be old, but may well not be either oxidized or dried out. Check
before you proceed  further.

Bearings that are shielded often have the shields retained by circlips made of
fairly thin wire. These can be removed with the tip of a sharp knife and replaced
after cleaning. Do not remove the ball retainers.

Bearings can be cleaned by soaking in a solvent. Possible choices are Goof-Off,
WD-40, kerosine, trichlor, or acetone. Some are flamable or toxic so be careful. An
ultrasonic is really good for cleaning bearings. I've seen small ones for dentures
that'd do nicely. Also, you can put the bearings and solvent in a small plastic bag
to keep the cleaner from getting dirty. Use at least 3 changes of solvent, each in a
new bag. The last rinse should be with very good, clean solvent. Dry in a dust free
environment.

BTW, if the ball retainer is plastic, be VERY careful with the solvent you use. It
can be damaged or crazed by the wrong solvent.

When clean and dry, the bearing should spin extremely freely and quietly. If it does
not, try some more cleaning.

The grease should be compatible with the ball retainer, if it's plastic. Don't
overpack.

Re-assemble in a clean place.... no grit, etc.

Good luck,
John