Atlas Copco ACTA 4000 - Page 62

Programming ACTA ACTA 4000 User Guide
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Group and Batch
In this dialog parameters regarding subgroups and batches are set. For more information on batch result
representation, see section Batch Result window.
1 Batch size
This is where you define how many tightening are used when performing
measurements with ACTA. The selected batch size is visible in the top
right corner of the measurement dialog box, inside the parentheses next to
the number of tightening.
2 Subgroup size
This is where you define the size of the subgroup used for the SPC
(statistic process control) calculations.
3 Subgroup frequency
Here is where you define the frequency with which the subgroups are
stored in ACTA and used for the SPC analysis.
Enter Result
1
store all tightening operations
2
store every second subgroup
3
store every third subgroup
Example: Subgroup size = 5 and Subgroup frequency = 3. ACTA then
stores the first 5 tightening operations and then skips 10 tightening
operations, stores the next 5 tightening operations, skips 10 and so on.
4 Batch result
Here, after the first completed batch, you can activate ACTA to display
the batch result before the next batch can be initiated. The batch result
tells you whether the batch is OK or if any torque and/or angle value is
outside the specified limits. See also chapter Batch Result window.
When all para
meters have been set according to your preference, highlight
OK and press ENTER or simply
press the
OK button on the keypad.
Torque
Here you define the statistical measurement criteria’s for torque limits that ACTA must use for the
statistical calculation for this tool. Parameters to set are:
1 Torque min.
Here is where you define the minimum torque limit for each
measurement.
2 Torque max.
Here is where you define the maximum torque limit for each
measurement.