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A method of making a mold frame is disclosed. A plurality of rows of cavities are formed in a mold plate. The cavities of each row are interconnected by a bore. The row bores are interconnected by cross bores. The cross bores are selectively sealed off so that a cooling medium going through the mold

A method of making a mold frame is disclosed. A plurality of rows of cavities are formed in a mold plate. The cavities of each row are interconnected by a bore. The row bores are interconnected by cross bores. The cross bores are selectively sealed off so that a cooling medium going through the mold frame follows a serpentine path.

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1. A method of making a mold frame for receiving a purality of half molds comprising: (a) forming in a mold plate at least four rows each comprising a plurality of spaced cavities, each cavity being capable of receiving a replaceable half mold, each said half mold when received in each said cavit

1. A method of making a mold frame for receiving a purality of half molds comprising: (a) forming in a mold plate at least four rows each comprising a plurality of spaced cavities, each cavity being capable of receiving a replaceable half mold, each said half mold when received in each said cavity defining a peripheral fluid passage space between the periphery of the external wall of the mold and the wall of each cavity; (b) forming a row bore in each row, said row bore interconnecting the cavities in each row and extending beyond the end cavity of each row; (c) forming two cross bores, one cross bore interconnecting the row bores on one end of the rows and the second cross bore interconnecting the row bores on the other end of the rows; (d) sealing off said one cross bore between the first and second and the third and fourth row bores and sealing off said second cross bore between the second and third row bores; (e) forming an inlet to a cross bore at the first row; and (f) forming an outlet from a cross bore at the last row whereby a serpentine fluid communication is produced between said inlet through the row bore in each row of cavities and out said outlet. 2. The method of claim 1 wherein there are seven rows of six cavities each and further comprising sealing off said one cross bore between the fifth and sixth rows and sealing off said second cross bore between the fourth and fifth and the sixth and seventh rows. 3. The method of claim 1 further comprising forming at least one annular groove in each said cavity, said annular groove being of a size and configuration to receive an O-ring.