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Bevel Basics and Beyond

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Bisect angle with a compass

Bisect angle with a compass

Then, bisect this angle with a compass as in the 4-step drawing left. Here's an explanation of each step:

Place the point of a compass at the bottom of the marked line (point B), and create points A and C by swinging an arc of any radius between 3" and 5". Use a sharp lead for the best accuracy.

  1. With the radius of the compass unchanged, place the point at C and swing another arc.
  2. Move the point of the compass to point A and swing an arc just as you did in Step 2. The intersection of these two arcs creates point.
  3. With a straightedge, draw a line from point B through point D to create the bisect line.
  4. Adjust your bevel according to the angle between the work-surface edge and the bisect line. To cut a tight-fitting miter, adjust your saw according to the bevel's angle as shown below.


Continued on page 3:  Duplicate cutting angles


Comments (4)
pf2 wrote:

Easiest and quickest way to bisect an angle on paper is to fold the paper such that side A lines up with side C. The fold will be at B.

8/1/2013 12:19:55 PM Report Abuse
BobWoodworker wrote:

Very useful explanation of how to determine and reproduce an existing angle. Thank you!

9/16/2010 05:21:16 PM Report Abuse
Jig User wrote:

Great tip, all woodworkers should know some basic geometry. There is probably some $500 tool out there that will create this angle for you.

2/25/2010 04:07:44 PM Report Abuse
ironhat wrote:

This is one of those operations that beginning to intermediate WW'ers sometimes never learn because it's assumed to be too basic for magazine coverage. I, for one, am glad for the review.

12/17/2009 07:36:58 PM Report Abuse

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