Layout Tutoral - Circle

[Brian Kent]

A woodworking friend uses this for a stable jig to cut an arc with his router. The point of the angle is a router bit hole and screw-holes for the base. He makes the arc on a pattern and then uses the pattern for routing the hardwood for the project.

[harry strasil]

I have taught what Tutorals I have posted here along with many others to Blacksmiths and Metal Craftsman for many years thru Short Courses held at Community Vo-Tech Colleges in Nebraska, Iowa, Minnesota, North and South Dakota and at National and State Blacksmith Conventions all over the midwest, They are basically from what I learned in Steel Worker "A" school in the Seabees, and they were simplified greatly when I got ahold of a late 1800's Sheet Iron and Coppersmiths book, and from my 3rd edition of the American Machinists Handbook. What it does is basically leave out all the complicated unneccesasry math from the process. FWIW

Although I am a high school dropout, I did get my GED, and I am what is called an Adjunct teacher and can teach college accredited courses.

[Sandy Stanford]

To Layout a Circle using a square:



1. Drive small brads the Diameter of the Circle, points "A" and "B".

2. Place the body of your Square across the points as shown.

3. Holding the point of your Pencil at Point "C" where the Tongue and the Body meet, slowly move the square, keeping the Square touching points "A" and "B".

You can draw up to a 14 inch Circle this way and a Larger one by flipping the square and drawing from both sides.

I recommend "Essential Guide to the Steel Square" for this and other techniques.