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Joseph Gwinn Joseph Gwinn is offline
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Default Clausing 5914 has arrived

In article ,
David Billington wrote:

Joseph Gwinn wrote:
[snipped]

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.


Both the Dickson and Toolmex toolpost blocks I have are equipped with a
pin, approx 8mm diameter slightly in from the flat side of the
toolpost. I am not sure of its intended use but it isn't required to
prevent the toolpost rotating when the centre clamp is being done up,
the friction of the toolpost base on the compound slide does that just
fine. The Harrison compound slide is drilled to take the pin and locate
the toolpost square to the compound slide which is what I use it for,
all clamping being done via the centre post.


That's the same pin I think. A detent is faster for setting to an angle.

One approach that occurred to me was to mill a squat steel plate that
fits snugly into the top of the large T-slot, and is drilled to accept
the big threaded stud that clamps toolpost using the T-nut below and the
big hex nut above. This plate could also have a few 8mm holes to accept
the locator pin.

Joe Gwinn