« on: March 21, 2017, 07:17:21 PM »
I put the home switches on X & Y axis and can't imagine using a laser etcher without them. Gets the laser to the exact same coordinates every time. My switches each go to a dedicated I/O pin.
Upon receiving the gcode HOME command the firmware:
1. Moves both X & Y forward 5 mm. Just to insure that they are not already at 0,0
2. Run the X slowly in reverse until the switch closes.
3. Run the X forward very very slowly till the switch opens.
4. Repeat steps 2 & 3 for the Y axis.
Take about 30 seconds.
I have burned multiple test patterns in cardstock without any visible deviation. Once the switch positions were finalized I used the machine to cut an alignment "L" out of 3mm plywood which makes a quick placement gig.