If you have been watching Mach3’s ‘current line’ readout, take note of the last number you saw. Unfortunately this number disappears and there is no way to restore it. Otherwise, use your best guess to see how far along the program you have progressed.
Enter the line from which to re-start the program in the current line readout.
Check the toolpath preview to see if the position in the program matches your intention. Be aware toolpaths may be vertically stacked, or otherwise impede your view of the actual location; perform further checks if necessary to verify this.
Manually move the toolhead to a location where there is a clear ‘line of sight’ to where you will start the program. This is necessary as some movements of the tool may not be as expected during a restart.
Start the spindle using the VFD power box.
Click on ‘Run From Here’ on the Mach3 controller, followed by ‘Cycle Start’.
A dialogue should appear with coordinates for an initial move. When clicking ‘OK’ to this dialogue, the tool will move to these start coordinates, directly, and the program will not continue. Click ‘Cycle Start’ again to resume the program.
IMPORTANT The machine will move in ways different to a normal cycle start. It will move to a starting point from its current point directly, so it is important that you inspect the information it provides about the move before you accept. It is unaware of your workpiece, or anything in its surroundings, so if this move goes through your workpiece, fixtures, or any other undesirable location, you are responsible for avoiding this. It will also dwell at that point until you click ‘Cycle Start’ a second time, during which the rotating tool may be in contact with your workpiece. If you are unsure, or do not wish to risk damage, either re-run your entire program or export a new program from Fusion360, updated to perform only the remaining cuts.