In article ,
"DoN. Nichols" wrote:
On 2007-12-30, Joseph Gwinn wrote:
In article ,
"DoN. Nichols" wrote:
On 2007-12-29, Joseph Gwinn wrote:
In article ,
"DoN. Nichols" wrote:
[ ... ]
Hmm ... is it perhaps the Dickenson style common in the UK with
Myford lathes? The toolpost has two vertical male V-ways, which match
female ones in the holders. The toolpost wrench a bent shank socket
wrench rotates a cam which draws in a T-stud which engages a T-slot in
the holders between the female Vees. There are two sets of V-ways and
T-studs -- one for turning and one for boring/facing. Each holder has a
long knurled thumbnut to raise or lower the holder, and an Allen-head
cap screw to lock the thumbnut to the proper height.
[ ... ]
Hmm ... "TIPO-M" suggests Italian or Spanish manufacture ("tipo"
being "type"). Not sure about the "RAPID I.S.A.", but you could try
a Google search for it.
Nothing came up on Google. Who knows if they are still in business.
Understood.
"Dickenson style" implies multiple makers. What are likely names?
Maybe Myford has a favorite maker?
AFIK, Myford uses genuine Dickenson (or is it Dickensen or some
other variant)?.
It turns out to be "Dickson", according to David Billington of the UK:
"The correct spelling is "Dickson", pic on the right here
http://www.pratt-burnerd.co.uk/specialchucks_7.asp . I have a genuine
Dickson and a Toolmex made one and the holders are interchangeable."
What *I* have is labeled with an EMCO tag, with no clues
whether it was made by someone else. I have seen a set of the same size
as one of the toolposts sold through the years by Shoptask for their
3-in-1 lathes which a friend has. It does fit on my toolpost -- but the
flange on the nut had to be turned thinner -- so I did not bother, since
it worked with his. (The cam which pulls in the T-stud has a groove
turned in an increased diameter section, with a partial sector milled
clear to allow the holder to be lifted off only when the cam is
loosened.
Emco also made a different version where the T-slot in the
holders is off center, and a T-headed bolt runs through the block
(clearing the center bolt) with a nut on the opposite side to lock the
tool holder down. I've never seen these except in the service manual
for the Compact-5/CNC.
So, Emco is another possible source.
I've seen much bigger versions sold on eBay -- but I don't
remember whether a maker's name was shown.
I suspect that the patent for the design is long expired, and
anyone who wants to is making them. Dickenson (in whatever spelling) is
simply the maker in the UK where Myford are located. :-)
[ ... ]
Examination of the underside
suggests that it was intended to clamp down on a tapered stud instead of
clamping down to a flat plate -- but I haven't gotten around to making a
matching taper for it yet.
The one I have appears to be intended to mount on a cylindrical post
with a smaller cylindrical screw clamping it down. There is a sliding
pin with a rounded nose that is intended to engage location holes at
various angles in a plate that is not in evidence, to prevent rotation.
There is no taper.
O.K. There was no index detent on this one -- but the taper at
the bottom would lock it firmly once clamped down.
Probably the taper is used in a later version. It would be tough to
make the pin-in-hole version completely rigid, so I assume that one also
torques the central bolt down tight. Actually, the purpose of the pin
is probably to prevent annoying rotation while torquing down. Tapers
lock almost immediately, making rotation less of a problem.
I don't think this toolpost came with the lathe, as it is cobbled to the
lathe.
Understood. It is not a common style in the US. I would not
bother using it for long -- but instead keep an eye out for an Aloris
style wedge in BXA size given the size of your machine. (I use BXA on
my 12x24" and am quite happy with it. And you even have a better chance
on eBay going for BXA than for AXA, because more of the hobby users are
going for the AXA size. :-)
I'll keep an eye out for BXA posts and holders. What's a reasonable
price?
Joe Gwinn