There are three grooves machined in each crank disc and three connecting rod big ends run in each pair of grooves.
This enables the connecting rod and slide bars to be dispensed with.
This drives the saw k through the medium of the connecting rod h.
These are known as the crank pin bearings or the "big end" of the connecting rod bearings.
The connecting rod has the cross-section of a four-rayed star and drives a crank in the center of the shaft.
The disk cranks are connected to a hollow steel ram by a connecting rod.
Steel oil scuppers are pinned and sweated onto the webs of the shaft, which allows of properly oiling the connecting rod bearings.
The connecting rod is also made of cast-iron, and attached to the beam and to the crank by axles or pivots.
A typical piston and connecting rod assembly which shows a piston in section also is given at Fig. 118.
This cross-head drives upwards and downwards an axle D, to which the lower end of the connecting rod E is attached.