FEC AFC1200 - Manual (Page 5)

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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 body assembly, for
example).
P The System will fasten to 1ST TORQUE during the specified 1ST STEP time.
Once either SPEED CHANGE TORQUE or 1ST TORQUE is reached, the System
will switch to the specified TORQUE SPEED (Section 6.3). When all fasteners
have reached 1ST TORQUE, the spindles will synchronize and fasten
simultaneously to 2ND during FINAL STEP time. When all fasteners have reached
2ND, the spindles will synchronize again, and fasten simultaneously to 3RD during
FINAL STEP time. When all fasteners have reached 3RD, the spindles will
synchronize again, and fasten simultaneously to STD during FINAL STEP time.
STD.
TORQUE
1ST STEP
FINAL
STEP
ANGLE
SPEED CHANGE
1st TORQUE
3RD
2ND
FIG. 6-1-1d Torque Control Functions for Four-Step Fastening
Maximum allowable 2nd, 3rd and Final Step cycle times FINAL STEP (TIME)
Maximum allowable 1st Step cycle time 1ST STEP (TIME)
30 ~ 50% of STD for Hard joints
50 ~ 90% of STD for Soft joints SPEED CHANGE (TORQUE)
30 ~ 50% of STD for Hard joints
50 ~ 90% of STD for Soft joints 1ST TORQUE
30 ~ 50% of STD for Hard joints
50 ~ 90% of STD for Soft joints
Set above 1st TORQUE/ANGLE 2ND (TORQUE)
30 ~ 50% of STD for Hard joints
50 ~ 90% of STD for Soft joints
Set above 2nd (TORQUE) 3RD (TORQUE)
Engineered fastening specification STD (TORQUE)
RECOMMENDATION FUNCTION
6.1.2 Angle Control Functions
Chapter 6: Fastening Instructions
Page 6-5