Spindle feedback at high spindle speeds

Do you really plan on threading at 10,000 rpm?

Are you trying to read the encoder with your parallel port or other hardware?

If your not doing spindle synchronized motion I assume it will be ignored...

John

It does sound rather complicated now as you want full spindle control with feedback part of the time and not when running too fast... as for how fast the parallel port can read depends on the results of the latency test and how fast your base period is. You would have to do the math on that... you might have to "switch" between two spindle configs in HAL depending on what your wanting to do. Of course the better solution if possible is to use something like the Mesa 5i20 to capture your spindle encoder or one of the newer low cost cards that are coming out.

John

frequency wrote:

No i not plan on threading at 10,000 rpm! I want to mill, to thread and to drive the spindle to position while tool changing with the same spindle it is a servo motor with an attached resolver.

Do you mean "Resolver" or does it have both?

[/quote]Yes i want to read the encoder with the parallel port card, i think it will be fast enough at low spindle speed and i hope it will be ignored at high spindle speeds?
The servo have a resolution of 4096 increments per revolution.
[/quote]

What you can probably do is use only the index (Z) as the input to your closed-loop spindle speed control, into one counter-mode single-channel encoder counter, and use the full A/B/Z channels for a separate encoder function linked to motion,spindle.position for rigid tapping etc.

For the closed-loop spindle, try to get the speed as close as you can with FF0 only, then add just enough Igain to hit the speed target. You probably need to leave P and D at zero.

frequency wrote:

It is one resolver who is read by the servo amplifier. The amplifier then gives me an value from 0-4095 and i want to convert it with a peace
of electronic to a quadrature signal and an index pulse.

That seems like a retrograde step. The 0-4095 is a nice absolute value. What format/interface is it on?