FEC FUSIONE-HS-2 - Manual (Page 100)

Chapter 6: Fastening Instructions
Page 6-4
Two-Step Fastening
Two-step fastening will be used primarily for joints that have a requirement to synchronize
with another spindle during the final stage of the rundown or require joint conditioning. Ex-
amples: Connecting Rod, Main Bearing Cap, any multiple-spindle application.
1. Once SPEED CHANGE TORQUE is reached or FREERUN REVOLUTIONS expires, the sys-
tem will switch from FREERUN SPEED to SLOWDOWN SPEED and continue to fasten to
1ST TORQUE.
2. The system will fasten to the 1ST TORQUE value during the specified 1ST TIME. 1ST
TORQUE must be reached within the 1ST TIME limits or a reject will occur.
3. Upon reaching 1ST TORQUE, 1ST TIME ends and FINAL TIME begins. 1ST TORQUE is
the shift point to TORQUE SPEED and the synchronization point prior to commencing the
next step. (See 4.13 for Sync. info)
4. The system will fasten to STANDARD TORQUE using TORQUE SPEED during FINAL TIME.
STANDARD TORQUE must be reached within the FINAL TIME limits or a reject will occur.
FUNCTION RECOMMENDATION / COMMENT
SPEED CHANGE TORQUE 10% of STANDARD TORQUE
THRESHOLD TORQUE Start point of 1 st torque rate monitoring (section 6.2)
1ST TORQUE
30% of STANDARD TORQUE
Used for RATE/TIME settings and TORQUE SPEED initiation.
Synchronization point for 2ND STEP
SNUG TORQUE Angle Monitoring Start Point (section 6.2)
CROSSOVER TORQUE Start point of 3 RD torque rate monitoring (section 6.2)
STANDARD TORQUE Engineered product fastening specification
1ST TIME HIGH/LOW LIMIT Acceptance range to reach 1ST TORQUE setting
FINAL TIME HIGH/LOW LIMIT Acceptance range to go from 1ST TORQUE to STANDARD
TORQUE
FIG. 6-1-1b Torque Control Functions for Two-Step Fastening
Standard Torque
Threshold Torque
Speed Change Torque
1 st Torque
Crossover Torque
1 st Time Final Time
Snug Torque
Torque
Angle/Time