hey guys

not sure if my emails are coming through to you guys.  hope they are.

i have just successfully set up my encoder for rigid tapping using index
signal from spindle motor encoder

just got a few questions for the group

is it possible to set different ramp values depending on spindle speed.

if I try rigid tap at 1000 rpm at 1mm pitch i get a over travel of about
5mm.  I can reduce the deceleration ramp in the altivar 71 schiender drive
to 0.5 secs and then the over travel is about one revolution of the
spindle.  but if i leave the settings in vfd like that and then run spindle
at 9000rpm the spindle goes into overvoltage faults.

just wondering if I can maybe set use the ramp internally to linuxcnc to
give me more control

http://linuxcnc.org/docs/html/examples/spindle.html

if i could specify a max rate of change and also a max ramp setting I think
I could set the values up so that at high speed the max rate of change
slows the spindle slowly enough that it doesn't  trip vfd.  while at low
speed say under 1000 rpm the spindle can stop faster.  or maybe I am just
miss reading this all


regards

Andrew

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