Model of tilt hammer, to a design made by Simon Goodrich in 1804, scale 1:12

The working model shows two hammers which were erected in Portsmouth Dockyard by Simon Goodrich, Chief Mechanician to the Navy Board. They were driven direct from the crankshaft of a beam engine, the lift hammer being used for forging iron and steel and the tilt hammer for softer metals.

The front bearing pin of the cam shaft is an extension of a cast-iron cage which slides over the end of the shaft and is secured to it by metal wedges ; and the cam ring is mounted on this cage through wedges of oak, which are driven in to form an annular packing.

The cams are replaceable when worn and provision is made for additional cams in the case of the lift hammer.

The bearings of both hammers are adjustable in their brackets for height and distance from the centre line of the shaft and the brackets themselves are made to slide longitudinally in their base plates.

In the model, the surrounding earth has been partly cut away to show the construction of the foundation which is made of timber baulks, bolted or tied together. The base plates for the bearing brackets and anvils are sunk in the foundation and are bolted to it. Some of the floor boards covering the base plates have been omitted.