In the figure the other wheel of the pair is shown dotted in at B, and the dead centre is set at the point where the axes of A and B would meet; hence if the largest diameter of the cone of A is turned to correct size, the cone will be correct when a straightedge applied as shown lies flat on the cone and meets the point of the dead centre E. The pinion B, however, is merely introduced to explain the principle, and obviously could not be so applied practically, the distance to set e, however, is the radius a.
"Modern Machine-Shop Practice, Volumes I and II"
Joshua Rose
To test the alignment of the jaws at end F, press a straightedge against the outside face of the hub and measure the distance J, Fig.
"Modern Machine-Shop Practice, Volumes I and II"
Joshua Rose
F is the straightedge, levelled ready to form a guide whereby the line D may be carried forward, as at E, level and straight, to the third target, and so on across all the targets.
"Modern Machine-Shop Practice, Volumes I and II"
Joshua Rose