YASKAWA YRC1000 Operator's Manual page 183

1 Spot Welding Application Using a Motor Gun
1.13 Other Functions Using a Motor Gun
4. Execute the job.
– The "TH" tag value of SVSPOT instruction will be rewritten with the
detected workpiece thickness, the value when the pressure reaches
the touch pressure, at each weld point.
The following formula is used to calculate the "TH" value.
Value of measured workpiece thickness
=
Gun axis position at the touch detection (mm)
+
DMF (Fixed side wear amount
−
SMF (Fixed side tip mounting error
error, mm)
• The value close to the actual workpiece thickness can be
obtained by considering the gun bend or pushing length.
The following parameter can decide whether to consider
the gun bend or pushing length.
A1P59:Consider the gun bend or pushing length when
detecting workpiece thickness
0 : Not consider the gun bend and pushing length.
1 : Consider the gun bend length.
The value of measured workpiece thickness is
compensated by the gun bend length calculated
with the following formula.
NOTE
"GUN ARM BEND COEF." of the gun condition file
x Touch pressure
2 : Consider the gun pushing length.
The value of measured workpiece thickness is
compensated by the gun pushing length calculated
with the following formula.
"GUN PUSHING COEF" of the gun condition file
x Touch pressure
• Do not change the above parameter between when mea-
suring and when monitoring. Detection cannot be per-
formed properly.
• A1P59 is set with 2 (The gun pushing amount is consid-
ered) as the default.
1-173
+
Movable side wear amount, mm)
+
Movable side tip mounting
183 of 198