Set up & repeat
Zero your machine and material: three references to get right
Understand machine home, the job's starting point and height before a CNC cut or laser engraving.
The short answer
Homing establishes the machine's reference. Job zero tells a CNC where your project begins on the material. Laser positioning and focus are separate choices. Getting one right does not automatically set the others.
- Machine reference
- Job position
- Height or focus
Home is not your board's corner
Home is the machine's known reference position. Your board can be elsewhere. Follow the controller's homing procedure and resolve faults before continuing; do not copy bypass commands from a different setup.
For the job, choose the same reference in the design and at the machine: for example, a specified corner or the center. Confirm units and orientation before moving to the stock.
For CNC: agree on the height reference
Z is the up-and-down direction. The program may reference the top of the stock or the top of the supporting wasteboard. Those are different planes. Measure actual stock thickness and make the design, toolpaths and setup agree.
Use the approved manual or probing procedure for your controller and probe model. Remove the probe and clip from the work area afterward. Tool-length handling depends on the controller: follow its tool-change workflow instead of assuming every new cutter has the same length.
For lasers: position first, focus separately
In LightBurn, Absolute Coordinates places artwork using the workspace position; Current Position starts relative to the head; User Origin uses a position you set. Controller support differs, so use the relevant documentation.
Focus is the lens-to-surface setup specified for your laser and head. A correct outline position does not prove correct focus or material suitability. Use only manufacturer-approved framing, with required guarding and eye protection; some framing modes emit laser light.
If the first mark is in the wrong place
Stop the job safely rather than dragging the stock to chase the cut. Once the machine is safe to approach, check the selected origin, units, stock orientation and height reference. Do not reuse a damaged part as proof of a correct setup.
Re-establish the required references and run the supported checks on a representative sample. Record the final reference location in a photograph or sketch for the next run.
Make the comparison
Make a decision you can explain
| Situation | A practical approach | Check before proceeding |
|---|---|---|
| CNC machine home | Initialize as directed | This is not the workpiece origin |
| CNC job zero | Match X/Y and Z to the program | Probe removal and tool-change workflow |
| Laser positioning | Match origin mode, then focus | Approved framing and material compatibility |
Name each reference before pressing Start. Never borrow a zeroing sequence from a different controller.
A guided conversation
Talk it through
Use these prompts with a friend, a customer or your workshop group. Open each one for a place to start—nothing is posted or collected here.
Which surface does the program call zero?
Point to the actual reference surface and find the same choice in the design file. Top-of-stock and wasteboard references cannot be swapped casually.
What changed since the last successful run?
Check whether the stock, cutter, probe, fixture, controller state or origin mode changed. A saved file does not restore every physical condition.
Can someone else reproduce the reference?
Save the corner or center selection, the face pointing up and the thickness measurement. Use a photo that clearly identifies the same reference.
Put the idea to work
Build a repeatable holderSources & editorial notes
- Carbide 3D: what homing establishes
- Carbide 3D: Shapeoko HDM manual, job zero and tool changes
- LightBurn: coordinates and job origin
References checked October 19, 2026. The examples and decision prompts are written for WoodWorkCalc; they are not field-test records or evidence of current market demand. Check current seller terms, prices and compatibility before buying. These guides contain no affiliate links.