The Vee grove
The main method for using the device is for it to be mounted on the lathe's top slide
with the drill in a drill chuck in the lathe's mandrel, more about that later. Because
of this it is essential that the vee is exactly at centre height. If a conventional
vee was attempted this would be difficult to machine and even more difficult to ensure
it was at the correct height. Making a stepped vee with progressively smaller end
mills and whilst mounted on the lathe's top slide, results in the accuracy required
and also being an easy process. If like me you use metric end mills the increments
will be in 2 mm steps, 16, 14, 12, etc. and at 1 mm depth increments. Not 2 mm increments
as the photograph show that I did.
Photograph 4 shows that the top slide was rotated 90 degrees for this operation.
The reason for this was that the traverse of the cross slide was just insufficient
for the cutters to reach the right hand edge. As will be seen moving the top slide
is not necessary when the finished item is put to use. If your lathe needs this extra
reach but the top slide cannot be rotated a full 90 degrees all is not lost. All
that is required is that the face being machined is at right angles to the lathe's
axis. This can still be achieved even if the top slide is set at 45 degrees. As a
last resort, temporary spacers could be placed between the cross slide table and
the leadscrew mounting bracket to increase the traverse. If using the method shown
in the photograph the actual machining is carried out traversing the cross slide
only, the top slide only lets the jig start that much further back.
The final task on the body at this stage is to produce the groove that positions
the bush holder assembly, Photograph 5. The set-up seen in the photograph uses a
toolmaker's type vice though this is not essential. However, note how its mounting
provides considerable freedom on its mounting position, very beneficial when working
on the vertical slide with limited travel. It also enables a vice with a larger capacity
to be used, also very worthwhile. I would therefore strongly advise the viewer who
does at least some milling on the lathe to obtain such a vice. See my pages for modifying
a economy drilling vice to produce a suitable toolmakers vice for the purpose, and
doing this also on the lathe.
Bush holder assembly, Bar Clamp, Collar clamp.
These are made from rectangular stock and with the vertical slide and vice still
set up from the above skim the ends of these to the quoted dimensions. Grip the part
in the vice just projecting from the ends of the jaws and machine by traversing the