01-02-2007, 11:02 PM
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Junior ??? Rocketeer
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Join Date: Mar 2005
Location: Knightdale, NC
Posts: 1,470
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Quote:
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Originally Posted by CPMcGraw
Carl,
Concerning those PB (Port Burner, or cored) motors, you said they would need to be drilled. What is the manufacturing problem about using, say, a Teflon-coated mandrel run up through the nozzle during the pressing operation? Couldn't the BP be pressed around the mandrel evenly and completely in a single pass of the ram? Or even have a double-piston, one pressing down from the top, the other pressing the mandrel up from the bottom, to ensure the even distribution of powder?
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It's not that easy. You can only pack a small amount of BP at a time. It bonds to the walls. The mandrel fills up and can't be cleaned on-the-fly.
It is really hard to explain.
__________________
Carl McLawhorn
NAR#4717 L2
semroc.com
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