## DOUBLE KEYWAY SEATING WITH TIMING The figure illustrates the example of a chain pinion where two 90° keyway seatings have been broached. The keyway seatings can be executed with a chamfered edge of 0.2x45° on the intersecting point between the hole and the keyway seat, so as to achieve burr-free broaching. In this case as well, the REV BROACHING TOOL offers the advantage of not having to move the workpiece, therefore considerably reducing production times. Machine tooling is also much faster than with traditional broaching and slotting machines. Lastly, using the REV BROACHING TOOL, once the alignment has been checked on the first keyway, all keyways executed thereafter will be perfectly aligned with the diametral level of the hole. This alignment is otherwise very difficult to achieve when lathing and broaching processing is carried out on different machines, due to the grip error that is inevitably generated.

PROGRAMMING EXAMPLES:

Highlighted in  red  only the values that require editing

O1000(RECALL MACRO O1000)

#1=0 (0=INT PROCESSING 1=EXT PROCESSING)
#2=0707 (TOOL NUMBER- WARNING DO NOT ENTER T BEFORE 0707)
#3=15.0 (Z AXIS WORK START DISTANCE)
#4=0.2 (X AXIS WORK START DISTANCE)
#5=25 (HOLE OR SHAFT DIAMETER)
#6=8 (INSERT WIDTH)
#7=3.3 (PROCESSING DEPTH ON X AXIS RADIUS)
#8=30 (PROCESSING LENGTH ON Z AXIS)
#9=6000 (CUTTING SPEED IN MILLIMETRES PER MINUTE)
#10=0,05 (INCREMENT OF EACH PASS)
#11=0 (ADMITTED DRAUGHT ERROR ON LONGITUDINAL RADIUS OF 0.25 MAX)
#12=90 (DEPARTURE ANGLE 90°/45°)
#13=2 (NUMBER OF FINISHINGS WITHOUT REMOVAL)
#14=2 (NUMBER OF OPERATIONS)
#15=0 (C-AXIS ANGLE BEFORE PROCESSING)
#16=90 (ANGLE BETWEEN OPERATIONS)
#17=0 (CODE G RETURN 0= FAST- 1=WORK)
#18=6000 (FEED BACK Z AXIS ACTIVATED ONLY IF #17=1)
#19=0 (WORKING ANGLE 0=CYLINDRICAL/WITH VALUE=CONICAL)
#20=0 (HELIX ANGLE +- INTERPOLATED WITH C AXIS)
#21=0 ( PRIMITIVE DIAMETER OF SPIRAL TEETH)
#22=35 (CODE M ON C AXIS )
#23=34 CODE M OFF C AXIS)
#24=90 CODE M BRAKE RELEASE C AXIS)
#25=89 CODE M BRAKE LOCK C AXIS)
#26=8 (REFRIGERANT 8=ON 0=OFF)
#27=1 (BRAKE 0=NO 1=YES)

M98P8000 (RECALL MACRO)

(M99=BACK TO MAIN PROGRAMME)
OR (M30=END PROGRAMME)