Begin with the tool and material
Identify the bit type, diameter, flute count, coating, material, and operation before choosing a setting. A compression bit in plywood, an upcut bit in solid wood, and a small engraving bit do not share the same safe starting point.
Watch chips, sound, and edge quality
During a test cut, inspect chip size, heat, chatter, fuzzing, tearout, and the machine's sound. Make one controlled adjustment at a time so you know what improved or damaged the result.
Record proven settings by setup
Keep a shop record for material, bit, machine, workholding, RPM, feed rate, depth of cut, stepover, and finish quality. Those records make future quoting and production more repeatable.
Advanced practice
Make a small test that teaches you something.
You can choose a conservative starting point, change one variable, and save a result you can reuse.
- Use a known bit and matching scrap material.
- Run a labeled test that changes only one variable at a time.
- Inspect edge quality, chips, heat, sound, and hold-down before choosing the next trial.
Related tools & lessons
Common questions
What should I change first when a CNC cut burns?
Review chip load, RPM, feed rate, bit condition, dust extraction, and whether chips are clearing the cut. Test carefully and adjust one variable at a time.
Why does plywood tear out on a CNC?
Tool geometry, grain direction in face veneers, hold-down, chip load, bit condition, and the entry or exit strategy can all affect tearout. Test on matching scrap before running finished sheets.
Can one speeds-and-feeds setting work for every machine?
No. Machine rigidity, spindle power, workholding, tool length, material, and dust collection change the safe and effective range.