FEC AFC1200 - Manual (Page 8)

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P After presetting the fastening sequence (SET SEQUENCE Section 7.5) to perform
a three-step fastening, the System fastening parameters (PARAMETER SET
Section 7.1) must be configured according to the Engineered fastening
specification.
P Three-step fastening will be used primarily for joints that have a requirement to
synchronize with another spindle during the incremental stages of the rundown to
crush/compress a gasket or grommet.
Examples: Valve cover, oil pan, body assembly.
P The System will fasten to the 1st TORQUE/ANGLE during the specified 1ST STEP
time. Once either SPEED CHANGE TORQUE or 1st TORQUE/ANGLE is
reached, the System will switch to the specified TORQUE SPEED (Section 6.3).
When all fasteners have reached 1st TORQUE/ANGLE, the spindles will
synchronize and fasten simultaneously to 2ND ANGLE during FINAL STEP time.
When all fasteners have reached 2ND ANGLE, the spindles will synchronize again
and rotate simultaneously the specified number of degrees from THRESHOLD 2
TORQUE to FINAL ANGLE within the specified FINAL STEP time.
TORQUE
FINAL ANGLE
1ST STEP FINAL STEP
2nd
ANGLE
ANGLE
THRESHOLD 2 TORQUE
SPEED CHANGE
1st TORQUE / ANGLE
FIG. 6-1-2c Angle Control Functions for Three-Step Fastening
Maximum allowable 2nd and Final step time FINAL STEP (TIME)
Maximum allowable fastening cycle time 1ST STEP (TIME)
Engineered fastening specification for rotation angle FINAL ANGLE
30 ~ 50% of FINAL ANGLE for Hard joints
50 ~ 90% of FINAL ANGLE for Soft joints
Set above 1st TORQUE/ANGLE 2ND ANGLE
30 ~ 50% of resultant torque for Hard joints
50 ~ 90% of resultant torque for Soft joints SPEED CHANGE (TORQUE)
Engineered fastening specification at which angle control
begins THRESHOLD 2 (TORQUE)
30 ~ 50% of FINAL ANGLE or resultant torque for Hard joints
50 ~ 90% of FINAL ANGLE or resultant torque for Soft joints 1st TORQUE/ANGLE
RECOMMENDATION FUNCTION
{ Four-Step Fastening
Chapter 6: Fastening Instructions User Console Version A3.53
Page 6-8