Rather than using a "Cylindrical Square" the method uses some square posts to mount
the castings, a "Square Square" I suppose. Whilst theoretically not as accurate as
the cylinder, providing the jaws of the four jaw chuck used when facing the end are
in good condition then the result will be more than adequate. Even though I did not
use the method I have rigged it up on the lathe for the benefit of the viewer, Photograph
9. If you wished to machine the end faces then it will be a case of using the cross
or vertical slide, Hemingway do not mention this so appear to accept that the ends
are left in the as cast state.
After the angle plate has been fully machined leave for a month of two and then return
and repeat the machining operations by taking a light finishing cut. This will ensure
that if the casting moved due to the initial machining that the final result will
still be accurate. A similar operation should be undertaken with the faceplate also.
If you wish to use the angle plate and faceplate in the intervening time there should
no problem as any movement is likely to be very small.
There are four accessories, with the material being supplied for these, added to
this is one of my own as I will explain later. Photograph 10 shows the accessories
together with the finished faceplate and angle plate.
These (square squares) are essential if using the method in Photograph 9 but even
if the viewer uses the milling machine with an existing angle plate they are still
worth making as they can often assist in mounting items on the faceplate, angle plate,
vertical slide or the machine table, see Photographs 11 and 12 There is a 9/16" counter
bore to take the head of the cap screw that secures the pillar but as such a large
counterbore is unlikely to be available in the majority of workshops this must be
made on the lathe as seen in Photograph 13.