Form tools can be classified in the following ways:

[1] Based on type of form:

1. Flat form tools.

2. Circular form tools.

3. End form tools.

4. Dove tail form tools.

[2] Based on setting of the flat tools:

1. Radial cutting edge.

2. Tangential cutting edge.

[3] Based on elements of the contoured surface on the tool:

1. Circular form tools with annular elements.

2. Circular form tools with helical elements.

3. Flat form tools with flat elements.

[4] Based on position of the tool axis:

1. Parallel to the work piece axis.

2. Inclined to the work piece.

Figure 7.3.1 show some of the commonly used form tools. These include:

1. Flat form tools (a):

• Flat form tools have flat profile and are used in horizontal position.

• These are the easiest type of form tools made by giving the required form on one end of a rectangular or flat shank.

• Proper clearance and rake angles are provided at each cutting edge.

• These tools are normally used to remove low amount of material.

2. Circular form tools (b):

• These tools are cut in disc type shape and are used for removing larger amount of material.

• The size of the tools is normally from 30 to 150 mm in diameter and the tools are mounted on the cross slide of single spindle automatic bar machines.

• The axis of the tool is always placed above that of the work piece in order to provide front clearance and permit cutting operation.

• The cutting face of the tool is arranged in line with the horizontal axis of the work piece.

• These tools retain their form throughout the working life and also have a longer life. They are thus more suited for mass production.

• These tools can be reground several times to sharpen the cutting face till the remaining part of the tool becomes physically weak.

3. Dove tail form tools:

• This type of tool is called a Dove tail tool because it is fitted to the tool holder through a dovetail joint.

• This type of fitting permits more rigid mounting of the tool resulting in faster production, better surface finish and longer tool life.

• Dove tail tools are provided with commented carbide tips and can be operated at faster speeds.

• These tools can be produced economically and maintained easily.

4. End form tools (d):

• These tools have the cutting edges on an end as shown.