FEC AFC1500 User Manual
Page 96
Chapter 6: Fastening Instructions
Page 6-10
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Three-Step Fastening
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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 grom-
met or for special joint conditioning (valve cover, oil pan, or body assembly, for example).
1. Angle control commences at SNUG TORQUE. All angle values are referenced from this point.
2. Once SPEED CHANGE TORQUE is reached or FREERUN REVOLUTIONS expires, the system will
switch from FREERUN SPEED to SLOWDOWN SPEED and continue to fasten to 1ST
TORQUE/ANGLE.
3. The system will fasten to the 1ST TORQUE/ANGLE value during the specified 1ST TIME. 1ST
TORQUE/ANGLE must be reached within the 1ST TIME limits or a reject will occur.
4. Upon reaching 1ST TORQUE/ANGLE, 1ST TIME ends and FINAL TIME begins. 1ST
TORQUE/ANGLE is the shift point to TORQUE SPEED and the synchronization point prior to com-
mencing the next step.
(See 4.7.6 for Standalone Sync. info)
.
5.
The system will fasten to CROSSOVER TORQUE/ANGLE, synchronize with other spindles
and then fasten to STANDARD ANGLE using TORQUE SPEED during FINAL TIME.
STANDARD ANGLE must be reached within the FINAL TIME limits or a reject will occur.
NOTE: When performing multiple step Angle control fastening, the rotation Angle should be
performed as one continuous operation. There should be no intermediate stop / synchroniza-
tion points once Snug Torque has been sensed and rotation angle is being controlled. Under
special conditions multiple steps can be performed using intermediate Torque or Angle
stop/synchronization points.
FUNCTION
RECOMMENDATION / COMMENT
SPEED CHANGE TORQUE
30% of SNUG TORQUE
THRESHOLD TORQUE
Start point of 1
st
torque rate monitoring (section 6.2)
1ST TORQUE/ANGLE
80% of SNUG TORQUE
Used for RATE/TIME settings and TORQUE SPEED initiation.
SNUG TORQUE
Angle Control Start Point
CROSSOVER
TORQUE/ANGLE
Start point of 3
RD
torque rate monitoring (section 6.2)
Synchronization point for 3rd Step
STANDARD ANGLE
Engineered product fastening specification
1ST TIME HIGH/LOW LIMIT
Acceptance range to reach 1ST TORQUE/ANGLE setting
FINAL TIME HIGH/LOW LIMIT
Acceptance range to go from 1ST TORQUE/ANGLE to
STANDARD ANGLE