I should add that the dimensions given suit my Myford S7 and will of course require
changing for other lathes, the design though being simple, this should not be a problem.
This is quite straight forward as the majority of tasks are relatively simple turning
operations with just one milling task that can easily be done on the lathe so that
the project is well within the bounds of the lathe only workshop. There are also
two parts that require 6 holes placed equally around their circumference but I will
be describing a very easy way of doing this on the drilling machine without the need
for a dividing head. The complete set of parts is seen in Photograph 1 from which
the reader can gauge the amount of work involved, a few of the simpler parts and
the spider are though optional.
Stop Bar Holder (6)
Cut a length of 16mm diameter, a little over 95mm long, and place in the chuck, face
the end and centre drill to about 12mm diameter. The purpose of the large centre
is that eventually it will provide a lead in for the Stop Bar when being used. Reverse
in the chuck and reduce the diameter to 9.9mm over a length of 14mm. This operation
is though only necessary if you are using collets rather than a jawed chuck as it
will permit the part to pass through the collet when it is reversed as is required
With the part reversed again, support with the tailstock and turn the 10mm diameter
and the taper, Photograph 2, do not though move the top slide from the 10° angle
until after the Body is completed. Fit the fixed steady, setting it to support the
10mm diameter, doing this whilst still supported by the tailstock centre. Remove
centre and drill 5.5mm diameter to a depth of 30mm and then with a boring tool on
the top slide bore to a diameter of 6mm by 27mm deep, ensuring as a result that it
is concentric with the taper and 10mm diameter which a 6mm drilled hole may not be.
Whilst concentricity is not vital it is worth aiming for being simple to achieve.
Reverse once more and hold on the 10mm diameter with the head now behind the chuck
jaws or the collet holding it. Face the end and reduce the diameter to 3/8” over
a length of 14mm and then, using a die, make the required thread. Finally, for this
part, drill 7mm diameter to a depth of 60mm.