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#1
 
03-18-2011, 12:42 AM
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I need to enlarge two holes in a part of 4140 that is proubly 30-35Rc is now 6X32 and need's to be taped 8X32 could I spot aneal it with a small tourch tip and let cool or maybe with resistonce heat two holes .250" deep not a blind hole could drill with a carbide end mill and ream 8X32 calls for .135" but I don't want to break a tap any ideas would be apreacaited Thank's Kevin  |
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enlarge a threded hole in hard part 
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