FIGURE 8-Headstock and alignment key in position over lathe.
The headstock is aligned with the lathe bed or column saddle with a precision ground key that fits into keyways in both parts. It is not square in cross section so it will fit in only one direction. Push the headstock firmly against it as you tighten the hold down screw. The mill headstock has two keyways milled into it so it can be mounted in conventional fashion or at a 90° angle for horizontal milling.
CAUTION! Always make sure the key, slot and mating surfaces are free from dirt and chips before locking down the headstock.
Removing the headstock alignment key allows the headstock to be mounted in positions other than square. This allows you to mill parts at an angle or turn tapers on the lathe. When using the lathe or mill without the alignment key, keep cutting loads light.