[TheForge] Lapping compound

[Mike Spencer]

There was a discussion awhile back about valve lapping compound.
Here's another application:

The big end bearing parts on my A&O air hammer are held together with
special 7/8" x ca. 10" bolts and nuts.  The nuts came off real hard
and after cleanup still require a lot of weight on a 2' wrench to turn
them on.  Gonna be hard and awkward to re-assemble inside the tight
space of the hammer body.  Running a tap through the nuts didn't help.
No visible distortions.  Machinist's blue didn't reveal any obvious
high spots.

So I smeared the bolts with lapping compound and turned the nuts on
and off a few times.  Cleaned off the abrasive real carefully. The
nuts now can be turned on by hand with a little effort.

- Mike

-- 
Michael Spencer                  Nova Scotia, Canada 
                                 
mspencer@tallships.ca            
http://home.tallships.ca/mspencer/