Before a CNC router cut, confirm the stock size and material, choose a workholding method, and secure both the starting piece and any cutouts that may separate. Check clamp and toolpath clearance, read the machine and router manuals, and follow the site's safety procedure.
Workholding is part of the setup, not a last-minute accessory. The method must hold the full sheet or blank and account for parts that become loose during the cut. The machine maker’s guide and the installed router manual govern the exact process.
Product comparison
| Setup item | Check before a cut |
|---|---|
| Stock | Material, thickness, flatness and work area size |
| Hold-down | Vacuum, clamps, screws or a method approved for the setup |
| Toolpath clearance | Bit, clamps, screws and cutout paths |
| Cutouts | Support or secure sections that may become loose |
| Safety | Machine, router and personal protective instructions |
What to do
- Read the machine, router and workholding manuals for the setup.
- Secure the full starting piece and plan for each part that will separate.
- Run the maker’s approved file check or dry run before machining.
Related guides
Sources
Common questions
Can I hold a CNC workpiece by hand?
No. Follow the machine maker's workholding guidance and secure the material before cutting.
Do vacuum tables work for every stock shape?
Workholding depends on material, surface, fixture and cut plan. Check the machine maker's material hold-down guide.
Can I adjust clamps while the router is running?
Follow the machine safety instructions and stop the tool before any adjustment.