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Precisiewerk Zierikzee BV

TOLERANCES FOR INVESTMENT CASTINGS

 

According to the VDG P 690 standards

Tolerances for length, width, height and pitch
Nominal dimension Tolerance class
in mm.

D1
±
D2
±
D3
±
0 - 6 0.15 0.12 0.10
  6 - 10 0.18 0.14 0.11
10 - 18 0.22 0.17 0.14
18 - 30 0.26 0.20 0.17
30 - 50 0.40 0.31 0.25
50 - 80 0.45 0.37 0.30
  80 - 120 0.55 0.44 0.35
120 - 180 0.80 0.65 0.50
180 - 250 1.20 0.95 0.75


Tolerances for angles
Tolerance class D1 D2 D3
Nominal size in mm. Angle in min. mm per 100 mm Angle in min. mm per 100 mm Angle in min. mm per 100 mm
0-30 30 0.87 30 0.87 20 0.58
30-100 30 0.87 20 0.58 15 0.44
100-200 30 0.87 15 0.44 10 0.29
>200 20 0.58 15 0.44 10 0.29
Note: the angle can deviate to both sides.

Tolerances for wall thicknesses
Nominal dimension
in mm
Tolerance
0-50 mm
±0.25 mm
50-100 mm
±0.30 mm
100-180 mm
±0.40 mm
180-315 mm
±0.60 mm

Economic engineering

Economic engineering of castings means that tolerances should not be made any closer then strictly necessary.

The tolerances listed give a fair idea of what can be achieved with investment casting.

Class D1:
Standard tolerances for commercial castings.

Klasse D2:
Tolerances for specific purpose castings.

Klasse D3:
Tolerances for highly specialised castings.