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Recommended Reading:

 Manufacturing Engineering and Technology

  Machinery's Handbook

  Marks' Standard Handbook for Mechanical Engineers

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The International Standards Organisation has also produced codes to identify inserts (shape, size, cutting edge geometry, tolerances etc) and their associated holders.

3.2.a) INSERT CODING.

The code for standard inserts is of the following format.

A B C D E F G H I

A B C D E F G H I

1. = Shape.
2. = Relief (clearance) angle.

C) = Tolerances ( ⁺/_- 0.05 to 0.38 mm).

D)= Type (with or without integral chip-breaker, neg/pos rake, countersink one/both sides etc.).

E) = Size.

F) = Thickness.

G) = Corner radius.

H) = Cutting edge condition.

1. = Designation of chipformers (Carbide/Ceramic, & grade).

Most good tooling manufactures adhere to the I.S.O. standard and a fuller description of the above variables available can be found in their catalogues.

3.2.b) TOOLHOLDER CODING.

The coding of toolholders is of a similar format.

A B C D E F G H I

A = Clamping system (e.g. S, screw clamping – Fig 2.2.2.a., M, top & hole clamping – Fig 2.2.2.b, etc).

B = Insert shape.

C = Approach angle (Sec 1.2.).

D = Clearance angle (of insert).

E = Machining direction (L, left; R, right; N, neutral).

F = Shank Height (from base to cutting edge). Note: BS indicates boring tool (round shank).

G = Shank Width (or shank diameter for boring tools).

H = Tool length (to tip).

I = Length of cutting edge.

A further part may be included, this is the Manufacturer’s Type Designation and is optional. W = wedge design; O,F & B designate a qualified tool (repeatability of position after changing or indexing – see Sec.2.2).

END

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