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# 0-80 tap on 316 Stainless steel


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use taping paste instead of coolant, the tool lige will be 100x longer

 

and be sure to hold the pre drill diameter to the tap spec a 80 TPI thread is freakin' small, just drill .005 to .007 bigger you wont get any thread in your hole

 

a 0-80 has .059 od and for a roll tap the tad drill size is .048 to .055

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I've never understood that logic.

 

How much Z do I need to give for enough time to synchronize out of the hole?

 

Edit: I'm showing 40sfm in my speed chart.

Not out of the hole but when the tap enters the hole. This doesn't really apply to newer machines, for the old klunkers it was a good idea to start the tapping operation .250 above the hole to allow the spindle to get to full RPM for entering the drilled hole. I've tapped at 2000 RPM at .050 above the hole but that was with a Brother tapping center and that's what they are made to do.

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