The mold is sized to fi t between the tie bars of the molding machine and not extend beyond the machine platens.

The mold width and height are a minimum of ½ inch wider per side than the part cavity dimensions and typically 1 to 2 inches for structural support strength.

The molds tack height (depth of mold closed) is 2.5 times the depth of the part cavity plus 4 inches.

This allows for the part depth plus 2 inches of steel safety stock for the support of the base of the cavity, plus a minimum of a 1 – inch plate on the core, an ejector stroke equal to part depth, and a 1 – inch thick ejector plate.

This also provides suffi-cient steel for the cooling line routing around the cavity for the temperature control of part dimensions.

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