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Technical Information

Collet run-out tolerances


Table 4 specifies collet run-out tolerances. These tolerances are checked as is shown in Figure 4 by the introduction of a test mandrel into the collet.

The diameter of the test mandrel is the nominal diameter of the collet. For the test mandrel, the following specifications apply:

a) diameter tolerance: h6;
b) cylindricity: 0,002 mm;
c) parallelism: 0,002 mm;
d) roundness: 0,002 mm;
e) surface without longitudinal marks;
f) maximum surface roughness Rz  4 µm;
g) surface hardness: (58  3 ) HRC.

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Key

1. Test mandrel
2. Test point.

Table 4 — Collet run-out tolerance values

d1
H7
Nominal diameter
l12 Run-out tolerance a
above up to (included) Class 1b Class 2
1 (included) 1,6 6     0,01     0,015
1,6 3 10
3 6 16
6 10 25
10 18 40   0,015   0,020
18 26 50
a)      Normal style collets are designed with run-out tolerance class 2. If class 1 is required, it shall be given separately, see 5.1.
b)     In the case of applications where run-out tolerances class 1 are required, the accuracy of the whole system (machine tool spindle, holder, collet and tool) shall be observed.

 

Collets (Figure & Dimension)


See Figure 1 and Table 1.

Tolerances in millimetres,
surface roughness in micrometres

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a. Reference area.
b. Form A, 6 to 8 slots..
c. Form B, 12 to 16 slots.

Figure 1 — Collets form A and form B

Table 1 — Collet dimensions

Dimensions in millimetres

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Holder ( F & D)


See Figure 2 and Table 2

Tolerances in millimetres,
surface roughness in micrometers

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Figure 2 — Holder form C

Table 2 — Holder dimensions

Dimensions in millimetres

Nominal size 11 16 20 25 32 40
d2              ± 0,05 11 16 20 25 32 40
d7                  6g M14 × 0,75 M22 × 1,5 M25 × 1,5 M32 × 1,5 M40 × 1,5 M50 × 1,5
d8                + 0,5 0   7,5   10,5   13,5   18   23,5   30,5
l6                min. 10 13 13,5 14 16 17
l7                min.
(Form A or B)
17 22 26,5 29 34 38

 

Nut


See Figure 3 and Table 3.

Tolerances in millimetres,
surface roughness in micrometres

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a. Reference area.

Figure 3 — Nut form D

Table 3 — Nut dimensions

Dimensions in millimetres

  Nominal size d7 6H d9 d10 l8 l9 l10 0 −  0,2 l11 max.
11 M14 × 0,75 19 12,1 11,3 3,1 1 5
16 M22 × 1,5 32 17,71 17,5 4,7 1,1 7,2
20 M25 × 1,5 35 21,76 19 5,5 1,2 9,2
25 M32 × 1,5 42 26,64 20 5,7 1,3 11,5
32 M40 × 1,5 50 33,57 22,5 6,2 1,6 14,9
40 M50 × 1,5 63 41,86 25,5 7,7 2,1 18,5

 

 

Cone angle tolerances AT3 and AT4


This annex specifies the values for AT3 tolerance (see Table A.1) and AT4 tolerance (see Table A.2) from ISO 1947:1973, System of cone tolerances for conical workpieces form C  1:3 to 1:500 and lengths from 6 to 630 mm, which has been withdrawn.

Table A.1 — Cone angle tolerance AT3

Range of cone lengths  L
mm
AT ATDa
µm
µrad seconds
over up to
10 16 100 21 1 ... 1,6
16 25 80 16 1,3 ... 2
25 40 63 13 1,6 ... 2,5
AT D is calculated from the constant AT α  value within a range of cone lengths.

Table A.2 — Cone angle tolerance AT4

Range of cone lengths  L
mm
AT ATDa
µm
µrad seconds
over up to
10 16 160 33 1,6 ... 2,5
16 25 125 26 2 ... 3,2
25 40 100 21 2,5 ... 4
ATD  is calculated from the constant AT α value within a range of cone lengths.