In issue 50 of the Model Engineers' Workshop Magazine (May 1998) I provided an article
for a quick change lathe tool holder, eventually adding it to this website, and,
like all my articles, it was about the prototype. This, because of not having the
luxury of time available to make one, put it through its paces, from which a final
design could then be established.
However, as is the case for almost all of my designs, any changes would have been
very slight. The fact that the holders work well as originally conceived should be
evident by the fact that they appear in many of the subjects appearing on the site,
Photos 1 and 2 being examples. In fact, only occasionally since they were made in
1998 have I used other methods for holding my lathe tooling. Typically, my knurling
tool as it has a larger shank than the holders can accommodate.
As seen above, I have headed this rerun, Mk 2, but in fact, whilst there are some
minor dimensional changes, the design principle is identical to the original. The
main changes being in the machining methods used.
Viewers who have not seen my design will probably be surprised that it does not follow
the very common method of using dovetails. Primarily, the reason for this is that
the design was established with the aim to minimise the amount of milling required,
as a result, making it practical for the lathe only workshop owner. Because of this,
eliminating the dovetails was all but essential.
There is though a personal reason for the design. Having worked all my working life
as an electrical control systems engineer, starting with a thousand of relays and
finishing with a thousand of transistors on a single integrated circuit, I am conditioned
to say, is there a better way of doing this. Coming to metalworking where so little
has changed, except for the introduction of CNC, has been an eye opener. This has
been evident to me by the relatively large number of people who have taken up my
designs for the grinding rests and my basic dividing head, for which there are no
commercial equivalents, but there being a noticeable reluctance to make my quick
change tool holders as I do not know of any being made, though a few probably will