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Technical Information

Backed with the years of experience, we had established our esteem organization in 2011 with two decades of knowledge in this domain as a backbone. Our name ACCU-FIX itself is synonym to accuracy and exactitude. Chasing the latest technology, we have become the technological leaders in precision collets for offering products that meets international standards. With the constant guidance of our Director, we are gaining the success on each passing day.

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:

Collet Run-out Tolerances
  • diameter tolerance: h6;
  • Cylindricity: 0,002 mm;
  • Parallelism: 0,002 mm;
  • Roundness: 0,002 mm;
  • Surface without longitudinal marks;
  • Maximum surface roughness Rz 4 µm;
  • Surface hardness: (58 3 ) HRC.
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)

Collets (Figure & Dimension)
Collets (Figure & Dimension)
  • Tolerances in millimetres,
  • surface roughness in micrometres
  • Reference area.
  • Form A, 6 to 8 slots.
  • Form B, 12 to 16 slots.
Collets (Figure & Dimension)

Holder ( F & D)

Holder ( F & D)
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

Nut
  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.

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