W4: Grinding-specific tool offset and tool monitoring
17.2 Online tool offset
Extended Functions
818 Function Manual, 03/2013, 6FC5397-1BP40-3BA1
17.2.2 Write online tool offset: Continuous
FCTDEF
Certain dressing strategies (e.g. dressing roller) are characterized by the fact that the
grinding wheel radius is continuously (linearly) reduced as the dressing roller is fed in. This
strategy requires a linear function between infeed of the dressing roller and writing of the
wear value of the respective length.
Function
FCTDEF allows 3 independent functions to be defined according to the following
syntax:
Function parameters
The function parameters are set in a separate block according to the following syntax:
FCTDEF(<polynomial no.>, <lower limit>, <upper limit>, <coefficient a0>, <coefficient a1>,
<coefficient a2>, <coefficient a3>)
FCTDEF
Function definition
Polynomial no.: Number of function (e.g. 1, 2 or 3)
Lower/upper limit: Determines value range of the function
(limit values in input resolutions)
Coefficients a
0
, a
1
, a
2
: Coefficients of polynomial
A 3rd degree polynomial is generally defined as follows:
y = a
0
+ a
1
* x + a
2
* x
2
+ a
3
* x
3
\ I[ D
D
˂\
˂[
˂\
˂[
<
;
D
D
Figure 17-11 Straight line equation
Note
FCTDEF must be programmed in a separate NC block.
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