centerpin bushing broaches - quality control

Michael Spalding spalding48@earthlink.net
Wed, 26 Jan 2005 07:51:52 -0600


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List,

A few months ago I bought a second set of broaches.  The first set was still in great shape, none missing, reaming sections still sharp and cutting well.  Problem is, I had always had problems fitting size 20 1/2 (.051) bushings.  The 051 reamer made them too loose, but the 050 wouldn't get them loose enough.  So I put a mic on the reamers, and found that all were correct size, except the 051 was actually 052.  Since I had been using this set for many years, I figured the warranty expired long ago, so for $20 or so why not just buy a new set?  Well, here's why not:  The sizes of the new set are all over the place.  broaches are oval by 1 to 2 thousandths, reaming sections smaller than burnishing sections by 1 to 2 thousandths, and again the 051 is closer to 052.  I anticipate that when I call Schaff, they will be willing to exchange, but the new set is likely not going to be any more accurate than what I have.  Is there a source for accurate broaches?  Must I learn how to make my own?  Any other thoughts/ideas?

thanks much

Mike


Michael Spalding
spalding48@earthlink.net
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