Plaster Mold Castings
Plaster slurry is poured onto pattern halves, allowed to set, then mold is removed from pattern, baked, assembled, and metal is poured into resultant cavity. Molds are broken to remove castings.
Aluminum, Brass, Bronze, Zinc, Beryllium Copper.
Normally up to 500 square inch area. Some foundries capable of going much larger.
One side of parting line ± .005" up to 2".
Over 2" add ± .002"/in.
Across parting line add ± .010".
Minimum Draft Requirements:
External: 0° to 1/2°
Internal: 1/2º to 2°
Normal Minimum Section Thickness:
Usually low. Often used to prototype for die castings. Average 50 to 250 pieces.
Normal Lead Time:
Samples: 2-6 weeks.
2-4 weeks A.S.A.