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Plaster Mold and Casting Design Guidelines
| Size |
|
Draft |
- Can
produce parts larger than 40 inches and smaller
than 1 inch
|
|
- Draft
should be 0° to 2° on average
- Slots
and rings: 3° to 5° draft wherever
possible
- Straight
walls are possible if necessary
Maximum
draft should be allowed whenever
possible
|
| Metals |
|
- Aluminum:
356 and most other casting alloys
- Zinc:
ZA12 and other Zamac alloys
- Magnesium
alloys
|
|
| General
Tolerances for Design |
|
| Size |
Machined
Tooling |
SLA
Derived RP Tooling |
First 2 inches
(First
4 cm) |
±
.005 inch
(±
.10 mm) |
±
.015 inch
(±
.30 mm) |
Each additional inch
(Each
additional cm) |
±
.001 inch
(±
.01 mm) |
±
.003 inch
(±
.35 mm) |
|
| Size |
Across Parting Line |
Flatness & Straightness |
Up to 8 inches
(Up
to 150 mm) |
±
.010 inch
(±
.20 mm) |
±
.010 inch
(±
.25 mm) |
8 to 15 inches
(150
to 250 mm) |
±
.015 inch
(±
.30 mm) |
±
.020 inch
(±
.50 mm) |
Over 15 inches
(Over
250 mm) |
±
.030 inch
(±
.80 mm) |
±
.030 inch
(±
.80 mm) |
- Generally, tolerances adhere to NADCA standards.
- Many tolerances can be improved up to ±
.001 inch ( ± .025 mm per 2.5 cm )
for special applications.
- Actual expected tolerances are dependent upon
specific part
geometry and should be discussed with Ultracast's engineering
department.
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