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Reply to "TiN drill bits"

This is from "doityourself.com":

 

The angle of the tool bit you will require depends on the material you are using. For example, in cutting brass you will want a side and back rake angle of 0 degrees, whereas if you are cutting aluminum you will need a side rake angle of 15 degrees and a back rake angle of 35 degrees. It is recommended that you always use the minimum angle required for the task you are trying to accomplish because sharper angles make for weaker tool bits.

 

Read more: http://www.doityourself.com/st...gles#b#ixzz2k6po5FQl

 

Or you could do a Google search.  But don't take my word for it, I am not a professional machinist, and have only built 36 steamers.

 

OGR Publishing, Inc., 1310 Eastside Centre Ct, Suite 6, Mountain Home, AR 72653
800-980-OGRR (6477)
www.ogaugerr.com

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