Excuse my ignorance, but if you are tapping, the tap is going to self feed
once it gets started. Don't you only need to concern yourself with the
depth of the tap prior to the spindle reversing?

Seems to me that that would then be a function of the number of revolutions
rather than the speed that the tap is turning. (unless you are going too
fast in which case you will hear the snap and then call on your reserve of
magic words!)

--

__
Roger Shoaf

Important factors in selecting a mate:
1] Depth of gene pool
2] Position on the food chain.



"Karl Townsend" wrote in message
anews.com...
I'm setting up rigid tapping on my mill. The encoder is ahead of the
backgear so I'm wanting the exact gear ratio. I set up an encoder on both
the shaft before the backgear and at the cutting tool so I could measure
the
turns of the spindle down to .01 revolution accuracy and took this data

Turns at tool turns at drive
1 6.1245
8 49.0573
80 490.65
163.050 1000

Is there a math wiz out there that can tell me how many teeth on the drive
gear and how many on the driven gear? (integer ratio of this data)

Karl