HEIDENHAIN CNC PILOT 640 - Attributes for Contour Description; Feed Reduction G38-Geo

DIN/ISO programming | Attributes for contour description
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HEIDENHAIN | User's Manual smart.Turn and DIN Programming | 12/2017
4.5 Attributes for contour description
Overview of attributes for contour description
G function
Description of function Page
G38 Special feed rate factor for basic
elements and form elements – modal
Page 266
G52 Equidistant Allowance for basic
elements and form elements – modal
Page 268
G95
Finishing feed rate for basic elements
and form elements—modal
Page 269
G149 Additive correction for basic
elements and form elements – modal
Page 270
Once programmed, G38, G52, G95 and G149-Geo
remain in effect for all contour elements until the
function is programmed again without defining
parameters
For form elements, you can program different
attributes directly in the definition of the form
element
Further information: "Machining attributes for form
elements", Page 246
The attributes for contour description influence
the finishing feed rate of the cycles G869 and G890,
not the finishing feed rate in recessing cycles.
Feed reduction G38-Geo
G38 activates the Sp. Feed Fact. for the finishing cycle G890. The
Sp. Feed Fact. applies to basic contour elements and form elements.
It is a modal function.
Parameter:
E: Special feed rate factor (default: 1)
Special feed rate = active feed rate * E
G38 is a modal function
Program G38 before the contour element for which it is
intended
G38 replaces a Sp. Feed Fact.
To cancel the special feed factor, program GG38
without parameters.