Before running the homing sequence on your Conversion Kit, Dominator Pro, or Core CNC machine, it’s important to ensure your system is wired, connected, and responding properly. This pre-flight checklist will help you confirm the essentials so that homing works smoothly and safely.

This video is covering the pre-flight on the Dominator Pro build and could be useful in understanding what you should do before homing your machine.

✅ Step 1: Proximity Sensor Functionality Check

Each axis of your machine has a proximity sensor (limit switch) that detects the machine's position during homing. Let’s confirm that they are working correctly.

• X Axis (Right)

• Y Axis (Back Right)

• Z Axis (Z-Carriage Up)

• B Axis (Back Left)

🔍 Visual Indicator Check:

Place a small piece of metal (like a tool holder or hex wrench) in front of each proximity sensor. Each sensor should light up to indicate that it has detected metal.

• X Axis (Left/Right Travel)

• Y Axis (Gantry Travel Front/Back - back/right)

• Z Axis (Vertical Travel Up/Down)

• B Axis (Second Y motor - back/left)

If any sensor fails to light up when triggered, check your wiring and connector integrity (unplug and replug) before continuing.

✅ Step 2: Confirm Input Assignments in Masso Setup

Go to the F1 - Setup screen on your Masso Touch controller and observe the Inputs Table.

Use a metal object to trigger each sensor one at a time and verify that the corresponding input changes from LOW to HIGH.

Also confirm that each input is assigned to the correct axis in the Masso configuration.

If an input doesn’t respond or is misassigned, revisit your wiring and double-check your Masso setup screen configurations.

✅ Step 3: Verify Correct Motion Direction

Use the F3 - Jog screen on Masso to jog each axis slowly and confirm directionality.

Z Axis:

• Z+ (Up): Z carriage should move upward

• Z– (Down): Z carriage should move downward

X Axis:

• X+ (Right): XZ-carriage should move to the right

• X– (Left): XZ-carriage should move to the left

Y Axis: (pay particular attention in case the Y and B are misconfigured and turn in opposite directions)

• Y+ (Back): Whole Gantry (both left & right sides) should move toward the back

• Y– (Front): Whole Gantry should move toward the front

⚠️ If an axis moves in the opposite direction, you must reverse that axis in Masso’s motor configuration or adjust the wiring before attempting homing.

Also note that if the Y & B move in opposite directions, a dip switch could have been accidentally changed or the Y or B configuration dialogs are not in sync.

✅ Step 4: Run the Homing Sequence

Once all sensors are verified and motion directions are confirmed, you can safely run the homing cycle from the F2 - Home screen.

• If everything was set up correctly, the machine will:

  • Home Z first (upward to trigger the Z sensor),

  • Then X,

  • Followed by Y (and B, if applicable).

The machine must home in the proper order and directions. If it fails or behaves erratically, press E-stop immediately and recheck each step of this checklist.

🧠 Additional Tips:

• Do not skip this checklist. Improper homing can cause crashes and damage.

• If you’re uncertain about a reading or axis motion, reach out to PwnCNC support with photos or video.