Words you will meet
- Flute
- A groove carrying chips away from the cutting edge.
- Shank
- The straight portion gripped by the tool holder.
- Stick-out
- How far the bit projects from its holder.
Start with the cut, then choose the bit
A flat-ended cutter can clear a recess and follow an outline. An upcut spiral lifts chips and can help clear a pocket, but may lift fibers at the top edge. A downcut presses fibers down for a cleaner top, while making chip removal more demanding. A compression bit combines directions; its geometry and cutting depth must suit the material to benefit both faces.
A V-bit makes angled grooves and lettering; its width changes with depth. A ball-nose cutter leaves a rounded bottom and is useful for curved surfaces. A surfacing cutter is for flattening a suitable bed or blank only when the machine, holder and cutter limits allow it.
What quality looks like on the listing
Look for an identifiable manufacturer, exact cutting and shank dimensions, material suitability, maximum speed and accessible cutting guidance. Consistent dimensions and a reliable source matter more than packaging or a coating color. Inspect a new tool for damage before installing it.
Solid-carbide tools are common for small CNC cutters; carbide-tipped tools have carbide cutting edges attached to a body. Neither description alone proves suitability. A cheap damaged bit is not a safe practice tool, and a premium bit cannot survive a clamp collision.
Keep the starter kit small
Choose one suitable flat-ended cutter for the first single-tool projects. Add a V-bit when lettering needs it and a replacement for the tool you rely on most. Confirm shank fit, cutting length and permitted projection from the holder. Do not grip the cutting grooves in the collet or improvise an undersized fit.
See the shape before buying the tool
Use the bit examples to compare what upcut, downcut, V-shaped and rounded cutters actually leave behind.
Explore the visual bit library →Your practice task
Read a bit specification like a purchase checklist
- For your planned project, write the required operation and material.
- Find a compatible cutter with documented diameter, shank, cutting length and speed limits.
- Save the manufacturer’s guidance with the exact part number. Note what you still need to ask.
Keep a record: The tool part number, purpose, dimensions and guidance source.
A mistake worth avoiding
Choosing a compression bit for a shallow pass without checking where its cutting directions change.
Check your understanding: Does a coating prove that a bit is high quality?
No. Start with traceable specifications, suitability, condition and support. A coating is only one feature.
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: The tool part number, purpose, dimensions and guidance source.
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.