Sharpening files and reamers (was: Teflon Reamers (# of flutes)

[McNeilTom@aol.com]

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In a message dated 11/5/01 5:13:27 PM Eastern Standard Time, cdant1@msn.com 
writes:


> I was just curious how you sharpen a file or reamer?
> -Chris
> 

Dear Chris and list -

It is not practical to sharpen files.  They are among the hardest things in 
your shop, only exceeded by carbide bits and most abrasives.  They are 
hardened by heat treating after their cutting surfaces are cut.  They are 
usually considered a replacement item when dull.  So, keep them clean and dry 
and away from things that are very hard - like other files, tool steel, hone 
stones, etc.

Reamers can be sharpened.  This requires precision grinding equipment.  
Sometimes the original manufacturer will resharpen reamers and other 
precision cutting tools.  The resharpened reamer will be a new (smaller) 
size, and there are limits to how much resharpening/resizing can be done.  
(Sharpening reduces the depth of the gullets between the cutting edges.  It 
also affects clearances and other aspects of the designed geometry of the 
cutting tool.)  In general shop practice, it is common to simply replace 
small or inexpensive reamers - like the center pin reamers we've been 
discussing.  The cost of servicing them may equal or exceed cost of 
replacement.  Sharpening is more cost-effective in larger sizes especially in 
solid carbide tools.

             -     Tom McNeil     -
Vermont Piano Restorations

"Outside of a dog, a book is a man's best friend.  Inside a dog it's too dark 
to read."
   -   Groucho Marx

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