3.  SETUP SERVOGUN THICKNESS CHECK SCREEN

Table 3, " THICKNESS CHECK Screen Items " lists and describes the Thickness Check screen items related to the setup and measurement method for part thickness check function.

Table 3.  THICKNESS CHECK Screen Items

Item Description
Thickness check

This setting specifies whether thickness checking is enabled. In the case of on request mode, this becomes thickness check permissive.

ENABLE — >checking is done based on thickness check mode selected below

DISABLE — >(default) checking is globally disabled and never done.

Thickness check Mode

This item specifies whether every spot should be checked or only those spots that are preceded by the condition, TCHK_RQD.

ALL — >if thickness check is set to ENABLE, checks are done for every spot and press motion that is not preceded by the TCHK_SKP condition.

ON_RQST (“on request”) — > (default) if thickness check is set to ENABLE, checks are done only for each spot and press motion that is preceded by the TCHK_RQD condition.

Check at 0kg

This item specifies whether thickness should be checked with no pressure in the gun. An additional step is added to relax the gun in this case.

ENABLE — >the weld pressure will be set to a minimum value (i.e. the gun is relaxed) prior to checking thickness. After the measurement is done the gun will close to weld pressure before welding.

DISABLE — >(default) check is performed when gun reaches the specified weld pressure. This is the faster of the two measurement styles.

Settling time delay (ms)

This item specifies a delay after achieving pressure, before reading thickness value. Adding a delay might improve the repeatability of the measurement but will increase the time required to complete the measurement.

Range of Settings: 0-9999 — >(default = 0) time in ms that system will wait after pressure is achieved before checking the part thickness.

Alarm severity

This item specifies the severity level of the message that is posted when an out-of-tolerance condition is detected.

WARN — >(default) if thickness check yields an out-of-tolerance value, a warning message is posted but the program and weld will execute normally

FAULT — > if thickness check yields an out-of-tolerance value, a fault will be issued that will immediately stop the robot and pause the program. No welding will be done.

Under thickness limit (mm) This item specifies the maximum deviation from specified thickness in the negative direction. For example, if:
  • Specified thickness = 2.0

  • under thickness limit = 0.5

  • Measurements < 1.5mm are out of tolerance

Range of Settings: 0-99.9mm — > (default = 0.5mm) A value of 0.5mm or higher is recommended for most users.

Over thickness limit (mm) This item specifies the maximum deviation from the specified thickness in the positive direction. For example, if:
  • Specified thickness = 2.0

  • over thickness limit = 0.5

  • Measurements >2.5mm are out of tolerance

Range of Settings: 0-99.9mm — > (default = 0.5mm) A value of 0.5mm or higher is recommended for most users.
Thickness out of tolerance DO

The output number (DO index) asserted, when a thickness alarm occurs. The specified output will turn on for the duration specified by the system variable $sggun#.$setup.$tc_almiopls (default=500ms) when an out-of-tolerance part is detected.

Range of Settings: 0 -> 999 — > (default = 0)