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Machined Tool Relief Grooves Dimensions and Tolerances

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Machining Tool Relief Grooves Dimensions and Tolerances

Size, Dimensions and Tolerances for Machined Tool Relief Grooves.

Per industry standards DIN ISO 509 and IS 3428

Relief Groove Definition: Clearance groove of specified form and dimensions created by removing material at an inner corner of a rotationally symmetric work piece and which is necessary for subsequent machining and assembly with mating parts.

Relief Groove Type E

Type E (see Figure 1 and Table 1) relief grooves are suitable where the planar surface is not subjected to high fatigue loads and where the cylindrical surface will be subsequently machined, if necessary. They are also suitable where mating parts have a relatively large counterbore or will not be in contact with the planar surface.

Figure 1 Relief Groove Type E

Where:

d₁ = workpiece diameter
t₁ = depth of cut
f = breadth of relief groove
z₁ = machining allowance
r = radius of relief groove

A relief groove Type F (see Figure 2 and Table 1) is applied for work pieces, whose surfaces which are at right angle to one another are machined further, if necessary.

Figure 1 Relief Groove Type F

Where:

d₁ = diameter of the work piece
t₁, t₂ = depth of cut
f, g = breadth of the relief groove
z₁, z₂ = machining allowance
r = radius of the relief groove

The relief groove of Type G (see Figure 3 and Table 1) is applied for work pieces with less load, for which as far as possible a smaller transition of the surfaces which are at right angles to one another, is required.

Figure 3 Relief Groove

d₁ = diameter of the work piece
t₁, t₂ = depth of cut
f, g = breadth of the relief groove
z₁1, z₂ = machining allowance
r = radius of the relief groove

A relief groove of Type H (see Figure 4 and Table 1) is applied for work pieces whose surfaces which are at right angles to one another are machined further, if necessary.

Figure H

d₁ = diameter of the work piece
t₁, t₂ = depth of cut
f, g = breadth of the relief groove
z₁, z₂ = machining allowance
r = radius of the relief groove

Dimensions for Machined Relief Grooves, All Dimensions given in Millimeters Table 1
All dimensions in millimeters (mm)
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1 Relief grooves with radii of the series 1 are preferable.
2 The allocation to diameter range is not applicable for short offsets and thin walled parts. For manufacturing reasons, it would be sensible to effect several relief grooves on a single work piece with different diameters, in the same shape and size.
3 Type G only for work pieces with less load .

Machining Allowance

The machining allowance z₁ and z₂ given in Table 2 displaces the blend of the relief grooves into the machined surfaces by the amount e and e₁,₂ respectively as given in Fig. 5. This amount depends on the magnitude of z₁ and z₂ and the relevant entry1and runout angles of the relief grooves.

Figure 5 Machining Allowance
All Dimensions in millimeter (mm)
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e₁, e₂ = breadth of the machining transition
z₁, z₂ = machining allowance

Allocation of Dimensions of Relief Groove and Machining Allowance, Table 2
All Dimensions in millimeters
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