Joshua Bigwood & Son
Precision Forging Machine
The Bigwood High
Efficiency Precision Forging Machine was designed to produce an
endless variety of close tolerance forgings that were extremely
accurate, so accurate in fact that machining was not necessary. The
machine was much more versatile than the usual Upsetting type of
forging machine, due to the exceptionally large die space and
gathering capacity. The dies were easily accessible to reduce the
time necessary for changing and setting up the tools. The machine
was equally at home on a mass production line or when only a few
forgings of one size were required.
||The long hanging heading slide moved on narrow
guides to ensure a straight line movement and accurate
registration of the dies. The die slide was operated from a
single cam on the crankshaft and via a double toggle joint
mechanism to provide an extremely powerful and precise gripping
action over the whole length of the dies.
An automatic stock gauge between the dies and heading tools
could be adjusted by hand to enable the operator to gauge
exactly the amount of material that was required for a given
|Several safety devices were fitted including a
brake at the end of the camshaft which held the crank securely
in its neutral position. The balanced flywheel was of the
safety-slip type which safeguarded the machine in case of
overload. A safety trip was fitted to the operating gear and a
safety device was fitted to the die slide closing mechanism.
The long hanging head slide prevented any
misalignment of the heading tools.
Capacity up to 2 inches diameter
9 inch stroke
55 strokes per minute
6.25 inch gather
3.75 inch die opening
Flywheel rotated at 220r.p.m.
Flywheel diameter - 3ft. 4in.
Power - 18h.p.
|The company also produced a range of machinery for the
forging industry, including power hammers, plain and automatic drop
stamps, bulldozers, forging rolls, and hot saw and burring machines.