198 ISO Programming
4.5 Attributes for Contour Description
4.5 Attributes for Contour
Description
Feed rate reduction factor G38-Geo
G38 activates the special feed rate for the finishing cycle G890. The
special feed rate applies to basic contour elements and form
elements. It is a modal function.
Overview of attributes for contour description
G38 Special feed factor for basic elements and
form elements—modal
Page 198
G52 Equidistant oversize for basic elements and
form elements—modal
Page 200
G95 Finishing feed rate for basic elements and
form elements—modal
Page 200
G149 Additive compensation for basic elements and
form elements—modal
Page 201
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 (see
“Machining attributes for form elements” on page 181).
The attributes for contour description influence the
finishing feed rate of the Cycles G869 and G890, not the
finishing feed rate in recessing cycles.
Parameters
E Special feed 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 special feed rate.
To cancel the special feed factor, program G38 without
parameters.
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