Re: [ATM] Open Question Concerning Pitch Laps

[Jim Burrows <burrjaw@earthlink.net>]

At 2005-02-28 16:20 -0500, Bryan Stiles wrote:

>I tried all the suggestions
>kindly provided but to no avail...I went back to fine grinding. In a
>nutshell the question is why does my lap quit responding?

Yeah, I agree with the others:  DON'T go back to fine grinding!  Anyway, 
pitch laps tend to lose effectiveness.  I think it's due to getting a crust 
of glass shavings which prevents the polishing compound from doing its 
thing.  Quite a while ago, I wrote a program that evaluated lap 
effectiveness - how much the surface changed vs. polishing spell time 
(looking back in the notes, 16 nm/min once dropped to 11 nm/min ).  This 
was mainly to find how long the next spell should be.  The number decreased 
steadily.  The solution is, as Ken Lowther suggests, to brush the lap.  I 
think, but I'm not sure, an ordinary cleaning brush will work, a wire brush 
being overkill.

         -- Jim Burrows
         -- mailto://burrjaw@earthlink.net
         -- http://home.earthlink.net/~burrjaw
         -- Seattle N47.4723 W122.3662 (WGS84) 

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