HEIDENHAIN CNC Pilot 4290 V7.1 - Manual (Page 164)

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Precision stop
Precision stop ON G7-Geo
G7 switches precision stop on. It is a modal function. The block with
G7 is run with precision stop. The CNC PILOT does not run the
following block until the tool reaches the position tolerance window
around the end point (for more on the tolerance window, see MP
1106, 1156, ...).
Precision stop OFF G8-Geo
G8 switches precision stop off. The block with G8 is run without
precision stop.
Blockwise precision stop G9 Geo
G9 activates a precision stop for the block in which G9 is programmed.
Surface roughness G10-Geo
G10 influences the finishing feed rate of G890. The surface roughness
(peak-to-valley height) applies only to basic contour elements.
Precision stop is used for basic contour elements that are
executed with G890 or G840.
Parameters
H Type of surface roughness (see also DIN 4768)
„ H=1: General surface roughness (profile depth) Rt1
„ H=2: Surface roughness Ra
„ H=3: Surface roughness Rz
RH Surface roughness (µm, inch mode: µinch)
„ G10 Geo is modal.
„ G95 Geo or G10 Geo without parameters switch the
surface roughness off.
„ G10 RH... (without “H”) overwrites the surface
roughness blockwise.
„ G38 Geo overwrites the surface roughness block by
block.