"Phil Kangas" wrote in message
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"whit3rd" wrote in message
...

This is not a cone, it is a wedge. The cut is only on one face
of the disk. The cut face is 2 deg off perpendicular to the center
axis of the hole. It's a nasty work holding situation.


As I read the question, the disk will end up 0.375" thick at
one point, and about 0.2005" at a point 5" from the first point.

Yup, you see it correct.
Perhaps one way to do it would be to make a work holding
ring long enough to hold in the mill somehow and cut a
2 deg face on one end. Then tack weld this ring to the
disk of interest and cut that face with the lathe. Make sense?
More taper disks could then be cut with this setup.

Are the blanks already 5" disks?

If so I think you could hold them at the 2 degree angle in a 4-jaw if
you made a locating jig to go behind them that places them at the
right height and angle.

The jig could be two strips of flat stock joined with threaded rod
into an H shape. The ends would be fitted to stay in place by lightly
contacting the sides of the jaws, or notched to fit over them for a
little more effort.

The tilt plane is at 45 degrees to the jaws so two grab the low side
and the other two the high side, and the strips are widely separated
out near the disk edges.

The strips could be either identically tapered at 2 degrees or
straight at the two heights that tilt the blank to 2 degrees,
depending on which is easier for you to make. Since I have an angle
block set my preference would be to taper them so their spacing isn't
critical.

-jsw