Words you will meet
- Bit
- The replaceable cutting tool.
- Bed
- The surface supporting the material.
- Toolpath
- The planned route of the cutter.
A computer guides the cutter
CNC stands for computer numerical control. In a woodworking CNC router, motors move a spinning cutting bit along a planned path. The machine removes small chips to create a shape. It is not a 3D printer: it starts with a piece of material and takes some away.
Most beginner routers move in three directions: X and Y across the bed, and Z up and down. A pocket is a recess with material left underneath. A profile follows an edge. Engraving puts a design into the surface. The same machine may do all three with suitable tools and setup.
You supply the decisions
The machine does not know whether your board is clamped properly, a screw lies in its path or the wrong bit is fitted. A convincing computer preview can still be wrong if the real setup differs. Your job is to connect the drawing, the cutting plan and the physical material.
A router can make signs, trays, templates and furniture parts. A round bit leaves rounded inside corners; it cannot create a perfectly square internal corner without a design change or later handwork. Buying a larger machine does not remove that limitation.
The journey from idea to part
Draw the part, choose the bit and cutting movements, preview them, secure the material, establish the starting point, run the checked job and inspect the result. Keep the first project small in complexity, with material large enough to hold safely.
Your practice task
Describe one useful thing you want to make
- Sketch a desktop name plaque with a shallow recessed rectangle.
- Label what stays and what the cutter removes. Mark the top face and a possible starting corner.
- List questions about size, holding and the tool before looking at machine prices.
Keep a record: Your project sketch, finished dimensions and the features you need the machine to make.
A mistake worth avoiding
Treating CNC as a button that automatically turns any downloaded file into a good part.
Check your understanding: If the preview looks right, is the real setup ready?
Not yet. The real bit, material thickness, starting point, clamps and clearances must match the plan.
05 / Project notes
Notes for your next project
Check off the topics you have reviewed and record anything useful for your next build. This tracks your learning progress; use your equipment’s setup procedure for machine checks.
Record: Your project sketch, finished dimensions and the features you need the machine to make.
No notes recorded. Use this space for your observations.
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Check each topic above to mark the lesson as reviewed. You can browse any lesson at any time.
Sources and next reading
Read the instructions for your exact model. Linked manufacturer examples explain particular systems; their settings and procedures are not universal. Sources checked October 17, 2026.