Follow us on Pinterest
Welcome, Guest! Log In  |  Join Now

Understanding Guide Bushings

Pages in this Story:
Figuring template offset

Figuring template offset

Offset is the distance from the outside of the guide bushing tube to the cutting edge of the router bit. This dimension determines where the bit cuts the workpiece.

To figure the offset, measure the outside diameter (OD) of the guide bushing tube and subtract the diameter of the bit. Next, divide this figure by 2 to determine the offset. In the example at right, subtract the 1/2" bit diameter from the bushing's 3/4" OD. You get 1/4". Now divide this number by two and you arrive at a 1/8" offset.

Know your alternatives
There are router bits capable of template routing without guide bushings. See the chart on the next page for comparison information.

Adapters and subbases are available from many mail-order sources, including the following:

Continued on page 4:  Comparing alternatives


Comments (1)
pf2 wrote:

After many years of using my DeWalt DW621 plunge router, I stumbled on the fact that the bushings were off-center relative to the bit -- even the factory bushing plate. Had to rework all my router bases. This wasn't noticed as long as I held the router in the same orientation; but when cutting door slat slots, I had to turn the router for safety/convenience. That's when the issue showed itself. Just a heads up...

1/15/2015 05:41:57 PM Report Abuse

Add your comment

You must be logged in to leave a comment. Register | Log In

Please confirm your comment by answering the question below and clicking "Submit Comment."


Connect With Us
  • Recent Posts
  • Top Posts
See More >