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Investment castings tolerances
Reference international standard: VDG P690
Linear Tolerances:
|
Nominal size |
D1 Tolerance |
D2 Tolerance |
|
0 to 6 |
±0.15 |
±0.12 |
|
6 to 10 |
±0.18 |
±0.14 |
|
10 to 18 |
±0.26 |
±0.20 |
|
18 to 30 |
±0.26 |
±0.20 |
|
30 to 50 |
±0.40 |
±0.31 |
|
50 to 80 |
±0.45 |
±0.37 |
|
80 to 120 |
±0.55 |
±0.44 |
|
120 to 180 |
±0.8 |
0±0.65 |
|
180 to 250 |
±1.20 |
±0.95 |
|
250 to 315 |
±1.30 |
±0.10 |
|
315 to 400 |
±1.80 |
±1.40 |
Tolerance for straightness, flatness, parallelism, shape :
| Precision class | Length of the tolerated element | ||
|---|---|---|---|
| to 25 mm | 25 to 50 mm | up to 50 mm | |
| allowed difference | |||
| D1 | 0.15 mm | 0.25 mm | 0.60% |
| D2 | 0.10 mm | 0.20 mm | 0.40% |
Tolerance for angle values and right angles :
|
Precision class |
Nominal dimensions |
|||
|
to
30 mm |
30 to 100 mm |
100 to 200mm |
up
to 200mm |
|
|
D1 |
allowed
deviation |
|||
|
minute
degree |
30 |
30 |
30 |
20 |
|
mm
/ 100 mm |
0.87 |
0.87 |
0.87 |
0.58 |
|
D2 |
allowed
deviation |
|||
|
minute
degree |
30 |
20 |
15 |
15 |
|
mm
/ 100 mm |
0.87 |
0.58 |
0.44 |
0.44 |
Surface Finish
|
Metal |
Average RMS Value |
|
Aluminum |
60-100 |
|
Beryllium
Copper |
60-100 |
|
Cobalt Chrome |
80-100 |
|
300 Series Stainless Steel |
90-125 |
|
Carbon Steel |
90-125 |
|
400 Series Stainless Steel |
100-125 |
Surface quality according to ISO R 468, DIN 4769 and VSM10321 :
|
Ra |
Rz |
Rt |
|
|
N9 |
6.3 |
23-32 |
25-38 |
Job Handling Capacity by: