So far, the max RPM I can read is equal to (slot width x100) + 100. So at a 4 mm slot I am reading max of 500 rpm. At the current slot width of 13mm I can read 1400 rpm max. I have tried two different break out boards and two different index pulse cards. I have tried setting the kernal speed in mach from 25,000 to 45,000. At the rate this is going I am going to need a 70 mm slot width to read my max speed. Is there some other setting in Mach that can affect the spindle rpm reading sensitivity?
Thanks
Vince