Counter–Spindle - Siemens SINUMERIK 840D sl Commissioning Manual

11/2006
9.6 Counter–spindle
Setup
© Siemens AG 2006 All Rights Reserved
SINUMERIK 840D sl Commissioning Manual CNC: ShopTurn – 11/2006 Edition
If your turning machine has a counter–spindle, you can machine workpieces
with turning, drilling, and milling functions on the front and reverse side without
having to rechuck the workpiece manually.
Before machining the reverse side, the counter–spindle must grip the work-
piece, pull it out of the main spindle, and position it at the new machining posi-
tion.
In order to use the counter–spindle on your machine,
you need the software options "travel to fixed stop" (Order No. 6FC5
800–0AM01–0YB0) and "synchronous spindle" (Order No. 6FC5
800–0AM14–0YB0).
When setting up the counter–spindle you need to take the following machine data
into account:
9803 $MM_ST_INDEX_AXIS_4: Axis index slide counter–spindle
9806 $MM_ST_INDEX_SPINDLE_SUB: Axis index counter–spindle
9812 $MM_ST_GEAR_STEPS_SPINDLE_SUB: Gear steps counter–spindle
9823 $MM_ST_DISPL_DIR_SUB_SPIND_M3: Direction of rotation with M3
9825 $MM_ST_DISPL_DIR_SUB_C_AX_INV: Direction of rotation C axis with M3
The position to which the counter–spindle travels when the program starts is
defined in the following machine data:
9851 $MM_ST_CYCLE_SUB_SP_WORK_POS: Retraction position of the
counter–spindle
If the counter–spindle is to travel to fixed stop when gripping, ShopTurn will
evaluate the following machine data:
9852 $MM_ST_CYCLE_SUB_SP_DIST: Travel to fixed stop, distance
9853 $MM_ST_CYCLE_SUB_SP_FEED: Travel to fixed stop, feed
9854 $MM_ST_CYCLE_SUB_SP_FORCE: Travel to fixed stop, force
Between traveling to the fixed stop and gripping, the counter–spindle can retract
a short distance to counteract compressive stress in the workpiece.
9857 $MM_ST_CYCLE_RET_DIST_FIXEDSTOP: Retraction distance for re-
lieving compressive stress after traveling to fixed stop
After gripping you can cut off the workpiece. Before doing so, the counter–
spindle can travel back a short distance with the workpiece to exert tensile
stress on the workpiece. This relieves pressure on the tool when cutting off.
9858 $MM_ST_CYCLE_RET_DIST_PART_OFF: Retraction distance for tensile
stress before cut–off
After cut–off, you can carry out a cut–off check with ShopTurn using the function
"Travel to fixed stop". You can activate/deactivate the cut–off check by means of
the following machine data:
9859 $MM_ST_CYCLE_PART_OFF_CTRL_DIST: Cut–off check, distance
9860 $MM_ST_CYCLE_PART_OFF_CTRL_FEED: Cut–off check, feed
9861 $MM_ST_CYCLE_PART_OFF_CTRL_FORC: Cut–off check, force
9 Additional Functions
9.6 Counter–spindle
9-145