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Hole for Roll Tap in Ti?

Joined
Mar 12, 2006
Messages
2,264
What's the optimum hole size for roll tapping Ti (.08, 6-4)?
The tap size is 2-56 and I will use a Tapmatic.
The chart says .078 to .080, but I've never used roll taps before and I've know these charts to be a little goofy sometimes.
Any suggestions?
 
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