On 14 July 2017 at 03:54, dave <[email protected]> wrote:

>> Ouch!  My brain is fried. How weather or age is getting to me. The
>> procedure for the taper is  clearly wrong.

Actually, it isn't. :-)

With an automatic facing boring head your procedure will work just
fine for boring tapers. You use a G33 move to move the toolpost the
right amount per rev to cut a taper based on the fixed infeed of the
boring head.
That is how I cut the taper for the tightening/measuring fixture built
in to the end-bracket of my milling machine:
https://photos.app.goo.gl/3GMXIgdhcQp82QOr1

But, really, I was meaning that one might buy:
http://www.createtool.com/article.asp?id=63
or
http://www.rotagriponline.com/index.php?option=com_virtuemart&page=shop.browse&category_id=1027&Itemid=29
or even
http://www.edgetechnologyproducts.com/tool-post-drill-chuck/

-- 
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, 1916

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