1 Spot Welding Application Using a Motor Gun
1.12 Tip Wear Detection and Wear Compensation (Motor Gun)
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1.12.2 Wear Detection
This section explains the method to detect the tip wear amount by dry spot
touch motion and movable side tip detection.
1.12.2.1 Dry Spot Touch Motion
The gun axis position is acquired when the movable side (upper) tip
touches the fixed side (lower) tip.
Dry spot touch motion is carried out by a SVGUNCL (dry spot) instruction.
“Base position (fixed)” will be registered when this operation is executed
while “base position (fixed)” is not registered on the spot supervision
window.
When executing the dry spot touch motion again after this registration is
done, the position difference between the detected position and the base
position is calculated as the whole wear amount (total amount of fixed side
wear amount and movable side ware amount).
<Example>
SVGUNCL GUN#(1)
PRESSTWC TWC-A
1 2 3
1. Gun No.
2. Wear detection pressure condition
3. Wear detection operation type
After registering the wear base position, do not change the
pressure condition settings used for the wear detection dry
spot motion.
In case the setting is changed, the wear detection may not
be executed appropriately.
As a pressure condition for the wear detection dry spot
motion, the dry spot pressure file (PRESSCL tag) can be
used other than the wear detection pressure condition
(PRESSTWC tag) described in chapter 1.12.2.1 Dry Spot
Touch Motion and chapter 1.12.2.2 Movable Side Tip
Detection.
When the wear detection pressure condition (PRESSTWC
tag) is used, the dry spot is executed under the condition of
the {TOUCH SPEED} and {DETECT PRESSURE} on the
spot supervision window.
When the dry spot pressure file (PRESSCL tag) is used, the
dry spot is executed under the dry spot pressure file condi-
tion.
Setting in the dry spot pressure file can be changed during
the operation because the file may be used in other pur-
poses other than wear detecting. For this reason, it is recom-
mended to use the wear detection pressure condition
(RESSTWC tag).
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