On Mon, 18 Jan 2021, Gene Heskett wrote:
But because once locked, its not a big deal if the cutting load slows the spindle 25%, its still locked at that phase angle and it will stay that way until the end of THAT cut stroke. But if YOU change the spindle speed, then YOU have changed the synch delay at the start of the next stroke and that changes the cutter position as it tracks the next stroke, cutting a wider groove with that next stroke. If you speed it up, the extra cut is the back edge of the tool because it synched later in the spindles rotation.
I dont think thats true, the initial delays do not affect the thread past any initial issues when the thread starts. This is because once synchronized, the Z is effectively in a _position_ locked loop with spindle rotation relative to the accumulated angle past the index. Changing the speed may change the start of the threads due to the lock-in time but not that main threading pass. You can verify this by turning the spindle by hand and doing multiple threading passses. Peter Wallace Mesa Electronics _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
