FEC AFC1200 - Manual (Page 8)

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w Three-Step Fastening
P After presetting the fastening sequence (Section 7.5 SET SEQUENCE) to perform
a three-step fastening, the System fastening parameters (Section 7.1
PARAMETER SET) 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 (valve cover, oil pan, or body assembly, for
example).
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 then 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 cycle 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
Chapter 6: Fastening Instructions
Page 6-8