AltMill - X and Z Limit Switch Adjustment.

To adjust the sensors for the X and Z, do the following. 

1. Disable hard limits in gSender. Otherwise, you will get an Alarm 1 every time the sensor is triggered, and it's annoying when adjusting them. It's found under Config, Homing/Limits, then Hard Limits enabled. After you press Apply Settings, remember to turn OFF and ON your controller to have the changes take effect.

   

For the Z axis

Unthreaded gantry plate

1. Jog the Z-axis to the very top of its travel
2. Loosen the back sensor nut and move the limit switch towards the spindle
3. When the red light on the back turns on, loosen the back nut 1/4 turn more
4. Jog the Z-axis back down
5. Tighten the front sensor nut

Threaded gantry plate

1. Jog the Z-axis to the very top of its travel
2. Loosen the back nut and rotate the limit switch so it moves towards the spindle
3. Check if the red light on the back of the limit switch turns on, and adjust the position of the switch until the light turns on
4. Secure the back nut 
5. Jog the Z-axis back down 

For the X Axis, with rubber bump stops. 

1. Move the spindle to the left.
2. Stop till there is a 1/16-1/8" gap between the bump stop and the spindle mount
3. Loosen the outside sensor nut and move the limit switch towards the spindle
4. When the red light on the back turns on, loosen the back nut 1/4 turn more
5. Tighten the inside sensor nut. 

Once complete, enable your hard limits.