Y–AXIS FAPT FUNCTION
4. DEFINING MACHINING
(4)Approach (escape) along a tangent circle: SM = 4 (EM = 4)
The following prompt is added:
LENGTH: DT = Length in the direction of the tangent (mm or inch)
DM = Length in the normal direction (mm or inch)
When the tool offset is executed by FAPT: Left side viewed
from the start point (CP = 1)
1) An undefined input for the approach or escape method is not accepted.
An undefined input of the DT or DN value is not accepted, either.
2) If finishing is performed after roughing in end facing, the tool is
returned by an amount equal to the distance of the clearance along the
Z–axis at the end of roughing. (In side facing, the tool is returned by
an amount equal to the distance of the clearance along the X–axis.)
Then, finishing is started.
3) If cutter compensation is performed by the NC (bit 0 of MTF1305 is
set to 1) and if approach or escape along a tangent line or circle is
specified, linear movement along the tangent is inserted when cutter
compensation is started (G41/G42 is output) and ended (G40 is
output). The extension amount set in system parameter 371 is
referenced when the movement is inserted.
No. Format Initial value Description
Extension for approach or escape
along a tangent line or circle during
371 Real number
C–axis notching or Y–axis contouring
Unit: mm or inch
*) The parameter affects the Family Program. Always specify a positive
value for this parameter.
The cutter compensation performed by the NC instigates the following
operation, depending on the approach/retraction method: