Tormach PCNC 770 - Using the Straight Probe Command

Chapter 7
110
UM10350_PCNC770_Manual_0916A
Programming
Aer successful probing, parameters 5061 to 5064 will be set to the coordinates of the locaon of
the controlled point at the me the probe tripped (not where it stopped), or if it does not trip to the
coordinates at the end of the move and a triplet giving X, Y and Z at the trip is wrien to the triplet le.
7.5.10.1 Using the Straight Probe Command
Using the straight probe command, if the probe shank is kept nominally parallel to the Z-axis (i.e.,
any rotaonal axes are at zero) and the tool length oset for the probe is used, so that the controlled
point is at the end of the p of the probe:
• Without addional knowledge about the probe, the parallelism of a face of a part to the XY-
plane may, for example, be found;
• If the probe p radius is known approximately, the parallelism of a face of a part to the YZ or
XZ-plane may, for example, be found;
• If the shank of the probe is known to be well-aligned with the Z-axis and the probe p radius
is known approximately, the center of a circular hole, may, for example, be found;
• If the shank of the probe is known to be well-aligned with the Z-axis and the probe p radius
is known precisely, more uses may be made of the straight probe command, such as nding
the diameter of a circular hole.
Example code:
o<probe_pocket> sub
(probe to nd center of circular or rectangular pocket)
#<x_start> = #5420 (Current X Location)
#<y_start> = #5421 (Current Y Location)
#<x_max> = 1
#<x_min> = -1
#<y_max> = 1
#<y_min> = -1
#<feed_rate> = 30 (30 IPM)
F #<feed_rate>
G38.3 X #<x_max> (rough probe +X side of hole)
F [#<feed_rate>/30]
G38.5 X #<x_start> (nish probe)
#<x_plus>=#5061 (save results)
G00 X #<x_start> (return to start)
F #<feed_rate>
G38.3 X #<x_min> (probe -X side of hole)
F [#<feed_rate>/30]