2. SPECIFICATIONSBACK MACHINING FAPT
When you are defining holes on concentric circles on a side surface,
a hole on a straight line on a side surface, a hole at an arbitrary point
on a side surface, a pattern on a side surface, or an arbitrary figure on
a side surface, enter the figure data defined with reference to the front
side no matter which spindle is used in machining.
Input the home position (DXH, ZH) and the turret index position (DXI,
ZI) for back machining as well as those for primary machining. If those
for back machining are the same as those for primary machining, input the
same values. If a position is in the second quadrant as shown in the figure
below, input a minus value for ZH or ZI.
For those questions, initial values can be set system parameters No.206
to 221. These can be skipped based on the value of system parameter
Machining except cutting off and bar feed machining can be performed
on the rear side.
(1)Machining type selection
Specify a machining type without discrimination of primary
machining/back machining. For work regrasping on moving from
primary machining to back machining, use “Sub cycle”.
The question for a spindle to be used appears on the tool data screen.
SPINDLE NO ... SN = (1: 1ST SPINDLE, 2: 2ND SPINDLE)
Input SN = 1 in case of primary machining; input SN = 2 in case of
back machining. This question is used to decide an M code for
commanding spindle rotation direction.
That SN = 2 in any process before sub cycle for work
regrasping and SN = 1 after this process can be input but
proper machine function cannot be guaranteed.
Home Position and
Turret Index Position