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making square holes

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Speedy Builder508/04/2010 21:31:42
2878 forum posts
248 photos
Perhaps you all know this,  but I needed to make a square hole in some loco crossheads.  First I drilled the holes to same diameter as the square hole.  Then silver soldered a piece of square HSS (smaller section than the drilled hole)into a piece of round stock.
 
Mounted this 'new tool' into the mill drill,  and used it as a broach, gently shaving off a little each stroke.

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