George Lendich wrote:

Paul,
Thanks - points taken, much simpler!
However I was going to use 1/2" aluminium plate, if I were to use 4130

what

thickness would I need.
George (down under)

1/2 inch plate for the flywheel?

0.125 or 4 mm 4130 would be plenty strong for the ouput disk. A lot

depends on how it is

attached to the psru input shaft.

BTW put the nuts on the back side of the flywheel or auto tx flex plate
as that will further reduce the bending force on those bolts due to

centrifugal

force.

Paul Lamar

Paul,
Thanks again! - The 1/2" aluminium plate I mentioned was for the output
disk.
4130 is very expensive over here, I'm considering now that I could mould an
aluminium one - it might be cheaper, how thick do you reckon.
I could mould in the cup (damper holder) and make the centre thicker to
accept a steel insert, splined centre.
Slowly getting there !
George (down under)

I would not cast it George. The material spec is less than wrought aluminum.
In that case you could tig weld 50 mm 4 mm wall aluminum tubes.

The high stress area is between the steel insert and the aluminum plate.
Best to use a splined steel flange and rivet it to the aluminum with 
two dozen rivets. In that case 8 mm thick aluminum plate would be plenty.

Paul Lamar
 
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