Comparative Processes |
Process |
Investment casting |
Die casting |
Forging |
Permanent mold |
PM |
MIM |
Resin Shell |
Sand casting |
Tooling cost |
Average |
High |
High |
Average |
Average |
High |
Average |
Low |
Unit cost |
High |
Low |
Average |
Average |
Low |
High |
Average |
Average |
Material Options |
Most |
Few |
Average |
Average |
Average
|
Average
|
Average
|
Average
|
Design freedom |
Most |
Least |
Least |
Average |
Least |
Least |
Average |
Average |
Volume capability |
All |
High |
High |
All |
High |
High |
All |
All |
Tolerance control |
Average |
Average |
Poor |
Average |
Best |
Average |
Poor |
Poor |
Size range |
Average |
Average |
Average |
Average |
Small |
Small |
Average |
Poor |
Surface Finish |
Average |
Best |
Average |
Average |
Best |
Best |
Poor |
Poor |
Wall minimum |
Average |
Average |
Large |
Large |
Large |
Average |
Large |
Large |
|
| Linear Tolerance Chart |
| Dimension (mm) |
Normal |
Special |
0~10 |
±0.20 |
±0.10 |
11~25 |
±0.25 |
±0.15 |
26~50 |
±0.35 |
±0.20 |
51~75 |
±0.40 |
±0.25 |
76~100 |
±0.50 |
±0.30 |
101~150 |
±0.70 |
±0.40 |
151~200 |
±0.90 |
±0.50 |
>250 |
±1.00% |
±0.60% |
|
| Wall thickness tolerances |
Angular Tolerance |
| ±0.01" ~ ± 0.015" |
±0.5° ~ ±1° |
| Perpendicularity |
|
| 0.008"/1"(0.08mm/10mm) |
|
| Surface Texture |
Limitation |
125 RMS Max
115 AA Max
60 Wheel craft
|
Max. Size 500X500X500 mm
Min. Thickness 0.3 mm
Max. Weight 20 kg Min. Weight 3 g |
|
|
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