"DeepDiver" wrote in message
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For example, the spindle is considerably longer than the body. There is a
retaining ring (with three set screws) that keeps the spindle snug against
the bearing surfaces of the body, but if this ring is loosened or removed,
then the spindle can slide axially in and out of the body. According to
marketing literature for a typical spin index, the "spindle travels 2-1/16
inches for flute grinding" which would explain the length of the spindle.

I have also used one to help shape the end of small plastic cylinders. Think
Unicam resharpening fixture. Slides in and out as you rotate. Needs a
prototype
mounted on the back end and a horizontally mounted stylus.

But what isn't clear is how one maintains the index position when the
spindle is slid out of the body.

Vertical stylus. Just the way you would on a "regular" end mill grinding
fixture.
Doesn't allow you to easily do primary and secondary angles though.

You don't use the indexing pin.

Because once you slide the spindle out, the
indexing pin is no longer able to engage the hole in the indexing plate
and
the entire spindle turns freely.


DOC