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This 1-inch ultra-smooth cut surfacing bit is used in your CNC router to surface or flatten your CNC router spoilboard (also called a spoiler board, or waste board), as well as slab flattening.

This particular surfacing bit is a redesign of the traditional surfacing bits you’ll find for CNC routers to give you much better performance.

  1. The forward cutting angle is decreased so you can achieve much higher feed rates
  2. The grind angle for both the front and the bottom of the surfacing bit is shallower to increase the life of the bit.
  3. Most important, a 4th flute has been added to achieve a superior smooth cut on the CNC wood project piece.

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.

Receiving your new CNC router is exciting. One of the first tasks you will want to do is level up your spoilboard for 2 reasons.

  1. Your projects will out even.
  2. You won’t cut into your spoilboard at high spots.

Spoilboard resurfacing is actually a very common thing that has to be done with new CNC routers, as well and reconditioning the surface after it has been cut into many times.

This 1″ diameter surfacing bit is made specifically for hobby and semi-professional CNC’ers. It is made to get effective clean-up on your spoilboard in one pass at high feed rates.

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.

The IDC Woodcraft 1 inch ultra-smooth cut surfacing bit works with all brand CNC machines with a 1/4″ collet.


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

Settings for this bit

  • Feed: 120-150 inches per minute (can go up to 175 ipm)
  • Spindle speed: 9000-12000 rpm
  • Past depth: 0.1″
  • Stepover: 70-80%


  • 4 Flute carbide tipped
  • Shank 1/4″ (6.35mm)
  • Cut Diameter: 1″ (25.4mm)
  • Cut height: 1/4″ (6.35mm)
  • Total length” 2″

For Vectric users, get the latest CNC router bit tool database by clicking here

For CNC’s with routers, refer to this PDF download feeds & speeds table


Weight 2.2 oz
Shank Size


For Materials


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