After installing your Mach3 controls and setting up your machine, you can also install limit switches to stop the machine from moving past its limits, and/or an emergency stop button to immediately shut off power to the machine.
Table of Contents:
- Installling the Limit Switches and E-stop Button
- Step 1: The overall setup
- Step 2: X-axis switches locations
- Step 3: Y-axis switches locations
- Step 4: Z-axis switches locations
- Step 5: Tripping the Z-axis switches
- Step 6: Connecting the homing switches to the breakout board
- Step 7: Connecting the limit switches and E-stop button to the breakout board
- Step 8: Wiring the switches
- Note: Continuing after triggering a limit switch
How to Install Limit Switches and E-stop Button
1. You will need to install 6 limit switches on your machine, 2 switches for each axis. These switches should be placed where the lever will be pressed once an axis limit has been exceeded. Using the standard 3D coordinate system FOR THE SPINDLE where positive X is to the right, positive Y is to the back, and positive Z is up, label your switches as X-home, X-limit, Y-home, Y-limit, Z-home, and Z-limit.
2. The X-axis switches should be installed so that the bearing on the lever will contact the closest perpendicular surface. The red line denotes what the bearing should line up with.
3. The same principle applies for the Y-axis switches, which should be installed so that the lever will contact the vertical surface, underneath the work platform...
4. … and the Z-axis switches.
5. For the Z-axis switches, you will have to add tabs to be able to press the switches. The tabs must be long enough to go past the line of action for the bearings, but also be rigid enough not to deflect when pressing the lever.
6. Connect your three homing switches to their respective ports on the breakout board. The positive wires go into axis-specific ports while the negative wire goes into the common ground port.
7. Connect all three limit switches to the two ports as in the photo, positive wires to the first port and negative wires to the sixth port.
8. Connect your wires to their respective switches. The positive wires go to the COM port, and the negative wires go the NC port. If the switches don't work, you can move the negative wires to the NO port. (Test them first, and when they all work, solder the wires onto the switches. Remember to consider your safety and those around you when you do so.)
Make sure that all your wires are not in the way of any moving parts on your machine.
NOTE: When a limit switch is pressed, the Mach3 program will go into Emergency Stop mode, and you'll need to press the Reset button to continue your project.