Chapter 6
79
UM10350_PCNC770_Manual_0916A
PathPilot Interface
Z DROs
Z Start and End – G8x starts at the Z Clear locaon and ends at Z End locaon.
Z Clear – This is the Z locaon the tool moves or retracts to at the start, end, and while pecking, as
well as moving between holes, so it must clear any obstrucons along the path between holes.
6.7.4.2 Tap
Tap uses the G84 canned cycle which is similar to the G81 drill cycle, except a spindle reversal is
commanded at the boom of the hole (see Figure 6.27). It is important that the Z Feedrate matches
the spindle RPM and tap pitch, so the rate is calculated from the pitch and RPM DRO entries. The
result is displayed in the Z Feedrate DRO (in the le panel) aer the Enter key is pressed in one of the
RPM, Pitch, or TPU DROs. Note that an auto-reversing tapping head typically uses a drilling cycle.
Dwell – Allows for tapping with a tension/compression tapping head. A calculaon is presented as a
guide to how much the tapping head may need to extend while the Z-axis is stopped during spindle
reversal at the boom of the hole. Dwell travel is half the distance the tap would travel at the
selected RPM. This assumes half the dwell me is on the down stroke and half up. It is also assumed
the RPM is constant during the down stroke, but since the spindle is actually decelerang to a stop,
the actual travel should be considerably less.
Pitch and Threads/Unit – These DROs are linked; enter whichever value is handy. When the Enter
key is pressed, the corresponding DRO is calculated and updated.
Z DROs
Z Start and End
–
G84 starts at the Z Clear locaon, reverses the spindle at the Z End locaon, and ends
back at the Z Clear locaon. Note that the tap connues a lile bit beyond Z End during the dwell period.
Figure 6.27
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