IBM EGX-400 - Manual (Page 107)

103 Chapter 6 - Detailed Description of Functions
6-2 Detailed Description of the Nose Unit
Amount of Height Displacement That Can Be Tracked
As long as the tip of the depth regulator nose unit (nose unit) is in contact with the surface of the workpiece, the cutting-
in depth can be kept uniform even if the height of the material changes. Slight surface curvature of a workpiece and
variations in plate thickness are tracked.
However, there is an upper limit to the amount of height displacement that can be tracked.
Limitations on Cutting
Care is needed when performing fill engraving (flat-drag cutting inside the contour lines of characters and shapes) over
a wide surface area. With fill engraving that is broader than the diameter of the nose cone, the nose unit may track the
surface that has already been cut and cut the surface further.