On 01/28/2019 04:28 AM, andy pugh wrote:
One oddity from Holbrook that I have not seen elsewhere
(and isn't actually a feature of the H17 in the original
advert) is a double dovetail on the cross slide. There is
a part rather like a butterfly shape, fitting into a
female dovetail in the saddle and another female dovetail
in the cross slide. The cross slide nut is mounted in this
dovetail, and normally it is rigidly bolted to the saddle
by a conical bolt. But you can move that conical bolt to
the taper-turning slide, and then you have completely
independent taper and cross slide motion. (with typical
taper-turning systems you have to use the compound slide
to adjust the cut)
http://www.lathes.co.uk/holbrook-B-13-71-21/ It is curious
that the Sheldon R series is absent from lathes.co.uk, but
then so is the Holbrook H series.
I didn't quite understand this description, but if you have
a taper attachment on the Sheldon R-series, it is a
"telescopic" taper attachment. So, the crossfeed screw ADDS
an adjustment to the taper attachment. I think this is what
you might be referring to. I think a number of larger
toolroom lathes have this feature. I think on the Sheldon,
you just turn two handles to switch how the nuts are
clamped, you don't have to move a bolt. (Wish I had the
taper attachment on my lathe! I could probably build one,
but I haven't because I might CNC it "someday".
Jon
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