The different steps in the design of a circular form tool using graphical method are as follows (Refer Figure 1).

1. Draw two concentric circles from $O_1$ with radii equal to the maximum $(R_{max})$ and minimum $(R_{min})$ radii of the work piece to be machined. Locate the points, A and B.

2. Draw a line through a equal to rake angle $\alpha$ to produce the tool face.

3. Draw another line through A equal to relief angle $(\theta)$.

4. Draw a line perpendicular to OL at a distance K from B. distance K is the minimum amount that will permit chip disposal from the tool face. Generally K varies from 3 to 12 mm.

5. From the point of intersection C of the vertical line an the line of the tool face, draw a line bisecting angle $\beta$.

6. The intersection point of the bisector and the line drawn at angle $\theta$, gives the center $O_2$ of the circular form tool.

7. With$O_2$ as center and radius R draw a circle and, determine all other dimensions graphically.

8. To find diameter of mounting hole, the wall thickness M is generally taken as 7 to 10 mm.