CNC Stepdown & Pass Planner
Split a target cutting depth into equal passes or maximum-depth passes with a smaller final pass.
Set up your calculation
An illustrative example is loaded. Replace its values with your measurements, costs or documented settings.
Tooling help: Compression transition · Material & zero
Calculation
Your result
- Pass count
- 5
- Equal stepdown
- 3.6 mm
- Maximum-plan first step
- 4 mm
- Maximum-plan final step
- 2 mm
Choose either equal passes or the maximum-stepdown plan in CAM. No pass exceeds your chosen maximum.
The quote handoff carries your inputs and assumptions. Only an explicit base cost is suggested as a quote cost; prices, rates and measurements remain planning notes.
How it works
Pass count = ceiling(total depth ÷ chosen maximum stepdown). Equal stepdown = depth ÷ count. A maximum-stepdown plan leaves depth − maximum stepdown × (count − 1) for the final pass.
- The maximum stepdown is your chosen limit, not a recommendation. Use the cutter maker's limits for the material and machine.
- Depth starts at the stock surface. This plan excludes finishing allowance, tabs, ramps and breakthrough allowance; it does not generate G-code.
Choose the tool and check the setup
Understand the cutting profile, material reference and equipment limits before applying the result.
Use this in your project
Continue with the next measurement or cost, then keep the assumptions with your quote.
How to use WoodWorkCalc · Woodworking lessons · Browse all calculators