On 01/18/2021 05:05 PM, John Dammeyer wrote:
Quick question about threading with LinuxCNC. If you do a feed hold between
passes for cutting a thread and during that feed hold change the spindle speed
what will happen?
No problem. At the beginning of EACH pass, the spindle
encoder is zeroed and synched to the index pulse. Then, the
Z axis is slaved to the spindle count. You can even stop or
back up the spindle during the threading pass, and the Z
will stay synched to the thread, within the backlash of the
Z axis.
>From a start it takes a certain amount of time to accelerate up to the
required speed. If the spindle is turning twice as fast as the previous pass it
then turns twice as far. That doesn't line up the cutter with the previous thread.
Well, as speed increases, it needs more air cut travel to
get synched, depending on the acceleration and performance
of the Z axis.
Jon
_______________________________________________
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users
