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Types Of Form Tools.
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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.

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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.
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