Manual

Compounding Turning Routines
Chapter 24
24-18
Where : Is :
P__ the sequencenumber (N-word) of the first block in the set of contour blocksthat
define the final contour.
Q__ the sequencenumber (N-word) of the last block in the set of contour blocksthat
define the final contour.
U W determine thefinishing allowancethat is left onthe part whenthe routineis
completed. This finish allowanceis typicallyremoved laterin the program when
a G72 finishing routine block isexecuted. The actual valueof the finish
allowance is equal tothe averageof the Uand Wparameters (U+W)/2. It is not
necessary toenter both of these parametersin thecalling block. If only oneis
entered, the control uses half of theentered parameter valueas thefinish
amount. The finishallowance isoptional and does not need tobe programmed.
See Figure 24.15 to determinethe signof U and W. U and Ware always
programmed as incremental values.
Important: This manualmakes theassumption that Wand Uare assigned
in AMP as theincremental axisnames that correspond to the Z andX axes
respectively.
Important: The value assigned to U isaffectedby radius/diameter mode
(G08/G09). W is not affected byradius diameter mode. If programming in
diameter modethe valueof the finishallowance isreally ((U/2)+W)/2.
I K determine theamount of stock tobe removedon thefinal passof the routine.
The actual amount of material removedon thisfinal passis equal tothe average
of the I and K parameters(I+K)/2. It is not necessaryto enter bothof these
parameters inthe callingblock. If only one isentered the control useshalf of the
entered parameter value. The finalpass isoptional and does not need to be
programmed. It is not a roughingpass andit does not removethe finish
allowance. A final passcuts toolpaths that are parallel to theworkpiece finish
shape.
Important: This manualmakes theassumption that I andK areassigned in
AMP asthe integrandaxis namesthat correspond tothe Xand Zaxes
respectively.
Important: The value assigned to I is alwaysan incremental, radius value
regardless of thecurrent mode (radius/diameter). K isalways anincremental
value and is not affected by radius/diametermode.
Important: The system installer has theoption of forcinga finalpass tobe
made by setting theproper AMP parameter. If this isthe casethe controlcuts
the final pass regardlessof whether I or K isprogrammed. When I andK arenot
programmed and the system installer has forceda finalpass tobe made, the
control assumesI and Kto bezero.
D__ the depthof cut for each passexcept the finalpass. No signneeds to be entered
for thisparameter. The depthof cut for the finalpass isdetermined withthe I and
K parameters. D isalways anincremental value regardless of the current mode.
Important: It is possibleto overridethe programmeddepth of cut (D) using
an AMP parameter. The overridesetting ismade inincrements of 1%ranging
from 0-255%. See documentationprepared bythe system installerfor details.
The system installer may alsodetermine amaximum allowable valueof D in
AMP. If the D value programmed islarger than themaximum allowed inAMP,
the control overrides theprogrammed valueand usethe AMPassigned
maximum value.