| 摘要 |
A tape-controlled milling machine, adjusted for material removal at a rate at least 100 times as great as for steel, is used to carve casting patterns from expanded polystyrene. Billets of the polystyrene material are carved without repetitive passes. Each rotatable cutter utilized is directed by the program of the tape to bring its edge through the excess material of the billet all the way to the final surface to be carved, and then to proceed along the final contour to be cut by it. Cost savings, material even where a single combustible pattern is to be produced, are multiplied when the tape is reused. |
