Tips and Tricks
Excess facing thickness
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Global variables for machines :
Two additional global variables are available for programming excess facing thicknesses of the part.
DECO + Sigma :
#3020 : Excess facing thickness of the part in OP mode [mm](inch)
#3021 : Excess facing thickness of the part in COP mode [mm](inch)
MultiDECO + MultiAlpha :
#3025 : Excess facing thickness of the part in COP mode, 1st pickoff spindle [mm] (inch)
#3026 : Excess facing thickness of the part in COP mode, 2nd pickoff spindle [mm] (inch)
Use:
The excess thickness value required that is programmed in operation (OP) mode can be entered in variable #3020. At the time of bar feeding (G912) the distance is added to the part length in order to have the material required for facing. To execute facing as such, it is sufficient to program a turning tool to Z=0 in order to remove this excess thickness. This operation can be carried out at any time during the part cycle. The same applies to counter-operation (COP) using variable #3021 (#3025, #3026).
Feature:
The part length (#3003) must be entered, without taking account of excess facing thicknesses. It is sufficient to indicate the actual length of the completed part.
Comments:
a) This function is available for the TB-DECO ADV 2004 version onwards. For all programs executed in versions 5.xx or 6.xx, the variables #3020 and #3021 can be used once these have been converted to the ADV version. The old programs, where the facing function in OP or COP was programmed using code G54 Z1=... and G54 Z4=... (see "Excess facing thickness"), can be adapted as follows:
1° Modify #3003. The length must be that of the finished part
2° Delete G54 Z1=-... or G54 Z4=-... that have been programmed for managing excess facing thicknesses
3° Enter the excess thickness values previously programmed by G54 in variables #3020 or #3021.
b) Variant B models (facing the front) no longer feature in the model databases in ADV versions.
Depicting variables #3020, #3021 :
Example: A part, 20 mm long that requires 0.5 mm facing on 2 sides.
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Values to be programmed
in the global variables :
#3003: 20
#3020: 0.5
#3021: 0.5
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ISO code of the facing operation during operation mode, showing the contour :
Note:
If the excess thickness has not been removed by turning (facing), this must be considered during the approach of the end tools (e.g. centring-drilling). In operation and/or counter-operation mode, an approach exceeding the value of the variables #3020 or #3021 must be programmed (see below). This caution does not apply where the excess thickness was removed during the first operation of the cycle.
Advantages:
Compared with the previous TB-DECO versions, the macros G915 and G916 take account of these excess thicknesses. It is no longer necessary to program an additional offset as described in "Excess facing thickness".
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