Woodworking Tips Index 
Saw Blade Protractor Dividing a circle laid out on a workpiece into equal parts doesn't have to involve tricky math or sophisticated tools. A circular saw blade will do the job. You'll need to find a blade with a tooth number that's evenly divisible by the number of circle parts you need. Just divide the number of teeth by the number of circle parts you want. This gives you the "magic tooth number" for each circle segment. Lay the saw blade on the workpiece with the arbor hole centered over the center point of the circle. Now just count off the number of teeth in each circle segment and make a mark. You'll end up with a perfectly divided circle. Since I have several blades with different numbers of teeth, if one blade doesn't have the right number, I just find one that does. 

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