The massive graphite is very easily machined and is widely used for electrodes, dynamo brushes, lead pencils and the like.
The main tube must be accurately machined as it has to be readily trained in its stuffing-box as well as be water-tight in all positions, through a considerable range of vertical travel.
A special nickelchrome steel was manufactured and machined by Messrs.
The sulphur-content should not exceed 0.12%, and it is better that it should not exceed 0.08% in castings which have to be soft enough to be machined, nor 0.05% in thin castings the metal for which must be very fluid.
Our new machined aluminum Drive Cone comes with a Lifetime Warranty.