Designing for the Permold process is very intuitive. As in most casting processes, draft, radius, and wall thickness are the main design elements critical to good castability. Our engineering staff is available around the clock to help you get the most out of your investment. Gupta Permold always meets and/or exceeds the Aluminum Association Standards for Permanent Mold Castings which are outlined in the table below for your convenience.

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design standards summary



Range (in.)
Standard
From
To
Base
Each Add'l In.

Linear Tolerance
.
.
.
.

One Side of Parting Line (Basic):
0
1
+/- .015
+/- .002

Across Parting Line (Add'l):
Tolerance is added as a function of projected parting face surface area.
Consult foundry for details.
0 in2
10 in2
+/- .010
10 in2
50 in2
+/- .015
50 in2
100 in2
+/- .020

Flatness
.
.
.
.
0
6
+/- .020
+/- .002

Concentricity
.
.
.
.

Same Plane:
0
5
+/- .025
+/- .003

Across Parting Line:
0
10
+/- .040
+/- .003

Machine Stock Allowance
.
.
.
.
0
12
1/16
12
18
3/32
18
24
1/8

Draft

3 Deg. on all Surfaces Perpendicular to Parting Line

3 Deg. on Cored Pockets & Holes (Draft Decreases Inversely with Length of Draw)

* Note: Additional draft extends mold life and makes better, cleaner castings

Radius

Razor Sharp Corners not Possible (in all foundry)

Recommended Blending Radius of " t" between 2 Walls of Thickness "t"

For Radii Between 2 Non-Uniform Walls, Use the Average Wall Thickness

Wall Thickness

*Note: Wall thickness values represented are minimums for castings of minimal complexity. Thickness values need to be increased as part complexity rises. Please consult Gupta Permold Engineering for specific job analysis.

Wall Thickness
Depth (in.)
Inside Draft (degrees)
Outside Draft (degrees)

Draft Requirements for Inside & Outside Walls

      
0.03 - 0.125
20
10
0.126 - 0.5
15
7
0.501 - 1
10
5
1.01 - 6
5
3
6 -12
1.5
1.5
Recommended Fillet & Outside Corner Radii
Diameter (in.)
Max. De+pth (in.)
Draft / Side (degrees)

Cored Hole Diameter vs. Depth Draft

      
0.25
0.125
15
0.25 - 0.5
0.25
8
0.5 - 1
1
5
1 - 2
3
3
2 - 4
6
2