Graphical Method for Profile of Circular Form Tool

The profile of circular form tool is displayed in Diagram.

Figure: Graphical Method of Determining the Profile of Circular Form Tool

The graphical method is as follows:

(1) Draw profile of workpiece in lower left corner.

(2) Project basic points on the axis I-I viz. 1′, 2′, 3′ etc. and form point O as a centre. Draw circles corresponding to radius r₁, r₂, r₃ passes via 1′, 2′, 3′ correspondingly.

(3) Assign proper value of α, ϒ. Determine outer diameter and centre of circular form tool.

(4) Draw circles passing through point 1, 2, 3 with radius R₁, R₂, and R₃ of tool corresponding to radii r₁, r₂, and r₃ of workpiece.

(5) To make tool profile in radial section, draw a radial line N-N to lay off distance l₁, l₂ to the right on line perpendicular to N-N.

(6) Draw lines perpendicular to N-N to lay off distance P₂ and P₃ from points I, II, and III.

(7) On the intersection of the lines that are corresponding to the dimensions P₂ and P₃ with lines determining dimensions l₂ and l₁, obtain points 1″, 2″, and 3″.

(8) Connect the points 1″, 2″, and 3″ by straight lines; we attain profile of form tool in radial cross section.