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General Mach Discussion / Re: G31 command stops since moving to Ethernet SmoothStepper
« on: January 23, 2020, 07:15:31 AM »As I understand it, the probe input is "wired in" to the stepping engine in M3 via the parallel port, so that stepping stops instantaneously when the probe is triggered. This is essential to make sure that the probe doesn't overrun and to get an accurate reading. The functionality of the M3 stepper engine isn't used through the ESS, the ESS does it instead, so this is probably an ESS issue rather than Mach 3.
Nice thought John but Mach3 cannot stop instantly without loosing position - it has to be a controlled stop (using deceleration) and there will be overrun. The contact 'trigger point' is stored in a variable rather than taken from the DRO reading to allow for this.
In reality (dependant on the axis acceleration setting and axis speed) the overrun is very small but it has to be allowed for in the probe design.
Tweakie.