Paul
could you tell me how many screw and size Tracy use to hold the planet
outside gear,
I am set up on the milling machine ready to make hole and taps.
Thanks


JEAN PRUDHOMME

Tracy used  eight 5/6th flat heads with the stock Ford powdered metal
bulk head.
They sheared off clean on Mark Steitle's 3 rotor.

I don't recommend doing it that way. The powered metal Ford bulkhead is
too hard and too brittle.

Use a bunch of extended point set screws in from the outer housing.

BTW Industrial Metal Supply in Burbank CA has thick wall aluminum tube

for PSRU housings.
Great outfit! Been doing biz with them for 50 years.
www.industrialmetalsupply.com/


Paul Lamar

Paul
I did index for 12 flat head screw at 82 degrees  .250" dia 20
coarse threads alloy from Mc Master

JEAN PRUDHOMME

It is a bad idea to do it that way. The shear load on the flat head screws is twice
as high as extended point screws in from the OD of the box. The position
of the screws half way down the wall of the Ford bulkhead acts as a lever
to double the shear load.

The high hardness of the powdered metal Ford bulkhead combined
with the lever effect makes a wonderful bolt shear :-):

Paul Lamar


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