On Sat, 21 Mar 2020 at 17:44, Leonardo Marsaglia <ldmarsag...@gmail.com> wrote:

> I intend to turn automotive camshafts, that is with a minimum of 180º of
> base circle (sometimes called heel I think), and a maximum lift of about 8
> mm

In that case the high resolution encoder might be good. I doubt that
you will me machining camshafts at 20,000 rpm.
(Especially not if the cutter needs to dive in and out)

For grinding you need to consider how the contact point rolls above
and below the centre line. I did do the maths, when I did the
crank-grinding mock-up. But only for a circular but eccentric result.

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1912


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