Tormach PCNC 440 - 6.8.2 Face Tab

Chapter 6
79
UM10372_PCNC440_Manual_0221A
PATHPilOT iNTERFACE
Chip thinning takes the stepover
(the horizontal depth of cut into
the workpiece) into account, and
provides the actual chip load.
As the stepover value decreases,
the actual chip load decreases. If
the stepover is too small, the cuer
may not have enough contact with
the material to cut — eecvely
resulng in pre-mature tool wear.
6.8.2 Face Tab
Face is generally used for cung an accurate top surface from rough stock, cung successive
XY-planes over a Z range (see Figure 6.27).
It is assumed that the top of the stock is free of any clamps or other work holding devices, such
as when the stock is held in a vise. The start of each Z pass is intended to be o to the side of the
workpiece then move in XY to start cung at the X Start, Y Start corner. This avoids the need for
plunging the Z Depth of Cut move into the workpiece.
Figure 6.26
Figure 6.27