On 01/01/2018 05:59 PM, John Dammeyer wrote:
Most of those VFDs appear to be open loop.
What's normally done with LinuxCNC for closed loop spindle control? Say you
want to do the equivalent of internal threading on a lathe. Is a run-out area
required or can LinuxCNC control the spindle speed in sync with the Z axis so
either a tap or cutter follows the threads?
Is an AC Servo (with encoder) even required on a CNC system or just open loop
variable speed control?
I run entirely open-loop, and it works fine. You do need a
spindle encoder for any threading operation.
On my minimill, the spindle slows noticeably when threading,
but the Z axis stays in synch with the spindle,
and it works fine. You need both a "run-in" and "run-out"
distance, as the Z axis cannot start and stop
instantly.
Jon
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