|Reproduction Longcase Clock
Before the brass can be sawn, turned, filed, milled or
drilled, one must decide on the actual design of the
movement: the outlay of the wheels, the number of teeth
and leaves, the striking system, the motive force........the
list goes on and on.
Since there are a few books out there written by learned
clockmakers who have already travelled down this path
many times I don't intend to go over all of the fine details.
That said, there is one book in particular which has been
of great help to me: Alan Timmins Making an Eight Day
Longcase Clock. In fact, if you are familiar with this book
you may find this project leans quite a bit on Mr. Timmins
But because I am using an entirely different escapement
the whole design needs to be altered. I have found it
helpful when designing the movement to use tracing paper
over the initial wheel outlay (see photos below) to be able
to get an idea of the layers of gears and levers, etc. This
also helps to make sure each piece has sufficient
clearance to "do its thing".
Another helpful thing for anyone just starting out is to
color code each set of trains or 'work' (motion, hammer,
etc) in the design. Sometimes the mish-mash of circles
and lines can be a bit overwhelming.
The first photo >>shows the basic strike and time train
layout page. The second photo >> shows the motion work
in green drawn on the tracing paper laying over the first
page to show the basic idea.
The plates were made first. I have a milling machine which
makes it much easier to get nice clean straight sides and
sharp corners. The holes for the pillars were laid out and
drilled next (this is going to be a 5-pillar movement).
The pillars were all turned on the lathe, of course, and It can
be time consuming mainly because you have to make each of
the shaping tool bits to shape each contour of the pillars. But
this is typical: if you work with clocks you find you spend more
time making things to make the clock.....sometimes making
things to make things to make the clock, too!!
The pillars and lathe bits that shaped them are shown >>; also,
the washers (which were shaped with the same bits)and blued
screws all made to suit.