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Understanding Guide Bushings

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Comparing alternatives

Comparing alternatives

You can skip using a guide bushing altogether if you use a pattern bit or flush-trim bit. Both types have a bearing that rides against the template, just as a bushing does. But because the bit cuts flush with the bearing, you don't have to calculate offset.


SETUP
PROS
CONS
  • Plunge cuts are possible.
  • Can substitute for straight bits.
  • Template hole and workpiece hole are the same size.
  • Bit deflection is more prevalent with small-diameter bits.
  • Full cutting length is exposed whenusing thin templates.
  • Works well in a router table or handheld router.
  • Only needed cutter length is exposed.
  • Template hole and workpiece hole are the same size.
  • Cuts are always full depth of the workpiece.
  • Can't make plunge cuts.
  • Plunge cuts are possible.
  • Can use multiple bits with same bushing.
  • Both shallow cuts and deep cuts are possible.
  • Hole in template must be larger than hole in workpiece.
  • Can't duplicate parts exactly.

 

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