FEC AFC1200 - Manual (Page 9)

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w Four-Step Fastening
P After presetting the fastening sequence (Section 7.5 SET SEQUENCE) to perform
a four-step fastening, the System fastening parameters (Section 7.1 PARAMETER
SET) must be configured according to the Engineered fastening specification.
P Four-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 (valve cover, oil pan, or ody assembly, for
example).
P The System will fasten to 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 fasten simultaneously to 3RD ANGLE during FINAL STEP time. When all
fasteners have reached 3RD 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
3rd ANGLE
1ST STEP FINAL STEP
FINAL ANGLE
2nd
ANGLE
ANGLE
THRESHOLD 2 TORQUE
SPEED CHANGE
1st TORQUE / ANGLE
FIG. 6-1-2d Angle Control Functions for Four-Step Fastening
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
Chapter 6: Fastening Instructions
Page 6-9