How to Use Diamond Router Bits

Written by steve smith
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Diamond router bits are commonly used to round the edges of granite countertops, tiles and other stone work. These bits are used in a similar way as regular steel bits, but the addition of ground-diamond fibres allows for the cutting of harder stone. Only use these bits on stone if you have the proper equipment, which includes a wet table that properly lubricates the stone as you cut and a high-powered router designed to cut stone.

Skill level:
Moderately Easy

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Things you need

  • Diamond router bits
  • Stone router
  • Wet table

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  1. 1

    Loosen the chuck on your stone router by inserting the key and turning it counterclockwise. Remove the old bit if necessary and insert the new diamond router bit. Tighten the chuck with the key by turning it to the right until the bit is secure, or the chuck key will not turn any farther.

  2. 2

    Set the router on the stone in the wet table. Adjust the router bit height to the proper height. This depends on how deep you want to make your cut. Turn the adjusting knob on the router to adjust the height of the bit. Lock both arms on the side of the router after the proper adjustments are made. Install the position bit, which is a round guide that forms the shape of the contour you are creating, by attaching it to the router and tightening it with an Allen key wrench.

  3. 3

    Turn on the router with the bit placed a few inches away from the edge of the stone. Work the router back and forth over the stone. Move it along the outside edge of the stone. The amount of friction will decrease as the cut is completed. When you begin to feel no friction at all, the cut is complete, as only the position bit is rubbing against the stone.

  4. 4

    Turn off the router and remove the position bit and diamond bit.

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