6. REFERENCE POSITION
The reference position is a certain fixed point on the machine. It is defined
as the point, to which a tool can be moved easily by the reference point
When setting a workpiece to be machined to general turret punch press,
the workpiece is held by the workpiece holders after positioning it by
applying the end face of the workpiece to the end locator and workpiece
holders mounted on the machine as illustrated below.
Apply face B to the end locator.
Apply face A to workpiece holder.
Generally, the distance between the reference position and the end locator
as well as the distance between the reference position and the workpiece
holders are intrinsically determined according to machines, and they are
separated from each other by a fixed distance.