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Old 07-21-2010, 08:33 PM
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Doug Sams Doug Sams is offline
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Join Date: Mar 2005
Location: Plano, TX resident since 1998.
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Quote:
Originally Posted by LeeR
But, I am not sure why they would have to be drilled. Why not an automated process that has a pin that rises up into the nozzle prior to pressing the BP, and then is extracted, leaving a core?
I think that's essentially the B8/C5.

My take is that for the more aggressive (steep) core of the B14, if you tried to merely ram it, that you wouldn't get the powder to pack tightly around the pintle (I think that's the right term) with the result that the core wouldn't be formed properly.

Since it's a powder being rammed (and not a liquid), you don't get true hydraulic behavior so the vertical pressures in the casing during the ram are greater than the horizontal forces - there's not enough force to pack the powder tightly around the core.

Anyway, that's only my theory - I am not a motor manufacturing expert - IANAMME

Doug

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