On 02/02/2017 09:42 AM, dragon wrote: > Ed Fanta does rigid tapping on his CHNC. I don't believe that he has a > breaking resistor on the VFD even. IIRC I watched the output of the > SPINx1 and it just goes from a + voltage to a - voltage and does not > "stop" he does have a fairly high line count BEI(?) encoder on the spindle. > > It works very well for him and he taps at surprisingly high spindle speeds! > No braking resistor and it still stops in 1/2 revolution at 200 RPM, 600 RPM it stops in 2 revs, above that it is slower to stop. It has mounted a 6" power chuck to add to the spindle mass. With a 16C collet it stops much faster. It is running a Toshiba VFD rated at 7 1/2 HP.
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