No subject

principal yield stresses, (tensile and compressive). Thus,
you would be looking at a 485000 psi shear yield. It would
not be too difficult to make some assumptions about the
engine/transaxle weight, the amount of points supporting,
and the relative location of these support points to the CG
of the engine/transaxle to determine a load per support. I
would then apply a 2X factor to this load for vertical
accelerations, and a 1X factor for lateral. I would make my
allowable shear stress about 162500 psi (SF of 3 on 485000
psi). With this data you should be able to quantify whether
this is an acceptable application in shear. You should
probably be able to get significant cross section in your
support block, so this should not be a problem. Also, the
fact that this material is used in gears and screws lends
some credibility to it's shear resistance is helpful, but I
doubt these are high load applications. In your design, you
would be advised to avoid bending type stresses. If this is
not possible, perhaps some 3/16" to 1/4" steel through
bolted on the sides of Delrin block could augment these
loads.The center carrier bearing application utilizing
Delrin developed by Javad sees only compressive stresses,
which is very suitable for this material.

We design quite a bit of tooling utilizing this material,
and tap directly without backing nuts. However, for an
automotive application, I would use a backing nut and washer
if possible. The types of applications we use Delrin for are
generally for toughness and abrasion resistance
considerations.

Which now begs the question.......this is not the infamous
GTI Fox we're messin' with here is it?

HTH

Craig Lebakken
1986 4KQ 260K mi.
Alive and running well. <---- Take that Audi Gods!