Quote:
Originally posted by Al Kaseltzer
It might be cost effective to compromise between injection molding and machining. If the Jet tube walls are the problem, mold them as solid cylinders and then drill them out as a second step.
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One of the things we did when we first make the blocks was to mill out the tubes as solid pieces, and then drill them. This actually resulted in a high percentage of the tubes snapping off from the pressure of the drilling. That, and the cost of having to use a CNC mill step after the molding means that the cost of the mold has to be amortised over a much large number of blocks (~1000) before break even is achieved.