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This 1/8 inch shank, 3/4-inch cut surfacing bit, for 1/8″ collet CNC routers, is designed for use in desktop CNC routers and is used to surface or flatten your raw wood, or flatten your CNC router spoilboard (also called a spoiler board, or waste board), as well as slab flattening.

The IDC Woodcraft 0.75 inch surfacing bit works with all desktop CNC machines with a 1/8″ collet (such as the 3018)

It may look ugly, but it works like a charm. SEE BELOW FOR SPECS

What makes the 1/8″shank 3/4″ surfacing different? It is the only one in the world. No other CNC router bit maker provides this bit except IDC Woodcraft, despite the many requests for it.

The surfacing bit for CNC routers is a super-important bit to have. Without a flat spoil board, your CNC projects will come out uneven, and not look good.

This video shows this bit in action. You can see it run at about minute 9.

The bit may not look pretty but the 4-flute design will give you a much cleaner cut than a 3-flute bit.

You’ll find the surfacing bit is a necessary bit almost immediately after you get your CNC router. This is because most spoil boards (a.k.a waste board or spoiler board) are not parallel to the router motion. So you need a flattening bit to resurface it.

This 3/4″ diameter surfacing bit is made specifically for desktop CNC routers but can be used on benchtop units as well.

If you have a 1/4″ collet CNC router, this bit is not recommended. You should use the 1″ surfacing bit, or the 1/1/2″ surfacing bit.

To read more about what a spoilboard is, read this article or watch this video about surfacing bit feeds and speeds, or this video about how a surfacing flattening bit can be used.


  • Spoilboard. or waste board leveling
  • Spoilboard resurfacing
  • Slab flattening
  • Cleaning up warped project materials

Settings for this bit

  • Feed: 100 inches per minute
  • Spindle speed: 10,000-12,000 rpm
  • Past depth (depth of cut): 0.05″
  • Stepover: 70%


  • 4 Flute carbide tipped
  • Shank 1/8″ (3.175mm)
  • Cut Diameter: 0.75″ (19mm)
  • Flute height: 1/8″ (3.175mm)
  • Overall length: 1.25″


Weight 1.1 oz
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