Talbot Associates - Provider of Metal Castings & Metal Forming Processes
Talbot Associates - Provider of Metal Castings
& other Metal Forming Processes
Phone: (973) 376-9570  •  Fax: (973) 376-7617  •   E-Mail: sales@metalbot.com
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Permanent Mold Castings

Molten metal is gravity poured into cast iron molds, or graphite molds coated with a ceramic mold wash. Cores can be metal, sand, sand shell, or other. Molds open and castings are ejected. The Low Pressure Permanent Mold method pressure-pours up to 15 p.s.i.

Metals:
Aluminum, Zinc, some Brass, Bronze, H.C. Copper, Lead and Gray Iron.

Size Range:
Limitation mainly foundry capabilities. Aluminum and Copper base: ounces to 100 lbs. Ferrous: 60 lbs. max.

Tolerances:
Aluminum: Basic .015"
Add .002"/in.
If across parting line add
.010" to .030" depending on size
Copper Base: Similar to Investment
Iron: .03" Basic.

Surface Finish:
Aluminum: 150-250RMS
Copper Base: 125-200RMS
Ferrous: 200-350RMS

Minimum Draft Requirements:
Non-Ferrous:
Outside: 2 Min (3 desirable)
Inside: 2 Min (4 desirable)
Ferrous: Outside: 1 Inside: 5

Normal Minimum Section Thickness:
Aluminum: .100" for small areas, up to 3/16" or more for large areas.
Copper Base: .060"
Ferrous: 3/16" for small areas, 1/4" normal.

Ordering Quantities:
Minimum one day's run: (100-1,000 depending on size).

Normal Lead Time:
Samples: 8-20 weeks.

Production:
4-8 weeks A.S.A.

Permanent Mold Castings