Having completed the milling head, seen elsewhere on the site,I decided I would like
to put it to use and in so doing provide some examples of what can be achieved using
it. However, as a departure from my more usual workshop projects, tooling that is,
I decided a small stationary steam engine would be a good idea. For this I chose
the horizontal mill engine, "Tina", from GLR Having decided on a "small" engine
I was surprised just how big a project it was when the kit of parts was opened up
and inspected and realised that it would fully test the milling head I was about
to use. As an indication of the physical size of the engine, seen in Photograph 1,
the base is 315mm long by 120mm wide and the flywheel 155mm diameter.
The viewer should be aware that this item is not intended to be a fully detailed
explanation of the construction of the engine but as an illustration of what can
be achieved using the milling head. Even so, most of the more complex machining tasks
are described so it should be an adequate guide for building the engine for all but
the newcomer to metalworking. In any case it is not really an engine that should
be a first project.
In keeping with the principle of making it using just a lathe with the milling head
and a small drilling machine, I have not used any other machines in my workshop,
even for tasks not illustrated.The viewer can therefore be confident that the engine
is within the capability of a workshop comprising a lathe and a small drilling machine.
The lathe will of course require either a milling head or a vertical slide, though
the latter would only be acceptable if one of the larger ones and even then such
items as the base will present additional problems. The flywheel being 150mm diameter
will be a problem for those with one of the smaller size lathes. In this case, attempt
to find a friendly model engineer (there are plenty of them) who will machine this
for you. Failing that, perhaps GLR may have a facility for machining this part, its
worth a try.
One final point then before I go into examples of some of the machining operations,
that is, my methods have been chosen with using the milling head particularly in
mind so as to display its capabilities. Even with a milling head being available,
some parts could be candidates for machining by other means, whilst mounted on the
faceplate or in the three or four jaw chucks typically. Do not therefore assume my
methods to be the best ones to adopt in all cases, though I have not included any
that do not work well. To avoid the article being too one sided though, I will discuss
a few turning and drilling operations where I feel they are of particular interest.