[TheForge] Lapping compound

Mon Jun 16 07:36:01 2003

Mike is right on with a great use for lapping compound.
In my days of power plant steam and gas turbine maintenance lapping compound was our friend for "lapping" in threads as Mike described, 
lapping in valve stem backseats, seal rings, valve seats, etc.

In fact I still have cans of Clover compound, A through EE.

We also used lead fuse wire for pinch checking bearing rings, etc.

The old ways are still in use in power plants.

Ray Miller
Cincinnati
> 
> From: [email protected] (Mike Spencer)
> Date: 2003/06/15 Sun AM 02:11:49 EDT
> To: [email protected]
> Subject: [TheForge] Lapping compound
> 
> 
> 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 
>                                  
> [email protected]            
> http://home.tallships.ca/mspencer/
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