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Understanding Guide Bushings

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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 (4)
thpalexyahooc wrote:

Also, check

2/23/2016 11:22:08 PM Report Abuse
bill98502 wrote:

You can, but when you use a guide bushing the template will be a different size than the piece you cut with the router.

12/5/2015 07:44:51 PM Report Abuse
dicklazertrix wrote:

why can't you duplicate parts exactly?

11/19/2015 10:51:47 AM Report Abuse

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