Chris Radek wrote: > On Sat, Sep 04, 2010 at 09:27:42PM -0500, Stuart Stevenson wrote: > > >> The spindle servo amp is a true servo drive. The speed control is +10 >> volts for max clockwise spindle speed and -10 volts for max counterclockwise >> spindle speed. It has an encoder on the spindle motor with AB feedback to >> the amp. It does not have an index pulse (we have not found one). It may >> have an index pulse out of the spindle motor encoder but it is not wired in. >> With a two speed gearbox the index pulse would not work for accurate spindle >> positioning. I will install an encoder on the spindle. >> > > On my machine I hooked one of the A/B channels also to index. For > normal tapping you just make one pass anyway, so orientation isn't > important. This just gives "lots" of index pulses, so when you tap > it just starts moving right away. > Some people have to do peck tapping, restarting the tap into the hole and going to a greater depth each pass. Stuart might need that with some of the aerospace alloys he works with.
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