On 12/20/24 22:50, johnd wrote:
Thanks.  Is there a minimum number of slots assuming the spindle speed is 
stable?I've not had issues with 60.  My friend has far less.Sent from my 
Samsung S10

My old mill used the existing bull gear in the 1J Bridgeport head as the encoder "disc", and I did tons of rigid tapping on anything from 2-56 up to 10-32 taps with zero issues.  That gear had 81 teeth, so 324 quadrature counts.

I was amazed at how long taps would last at 600 - 1000 RPM.

Jon



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