FEC AFC1100 - Manual (Page 4)

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6.1.2 Angle Control Functions
In Angle Control method, fastening is performed based upon attaining a desired torque value
and then rotating the fastener a specified number of degrees. Fastening can be performed in
from 1 to 2 incremental steps that will successively secure the fastener to a specified torque
or angle value before attaining the final number of degrees of rotation. Angle Control method
is primarily used when greater control of clamp load is required.
(Example: Connecting rods, main bearing caps, cylinder heads.)
{ One-Step Fastening
P The System fastening parameters must be configured according to the Engineered
fastening specification.
P One-step fastening will be used primarily for joints that have no requirement to
synchronize with another spindle during the final stage of the rundown.
Examples: Pipe plugs, any single-spindle application.
P The System will fasten to the STD ANGLE value during the specified 1ST STEP
time. Once SPEED CHANGE TORQUE is reached, the System will switch to the
specified TORQUE SPEED (Section 6.3). Once SNUG TORQUE is reached, the
System will rotate the fastener the number of degrees specified by STD ANGLE.
STEP
TORQUE
FINAL
STEP
FINAL ANGLE
1ST
STEP
1ST
ANGLE
SNUG TORQUE
ANGLE
(TIME)
SPEED CHANGE
TORQUE
FIG. 6-1-2a Angle Control Functions for One-Step Fastening
Maximum allowable fastening cycle time 1ST STEP (TIME)
Engineered fastening specification for rotation angle STD ANGLE
30 ~ 50% of STD for Hard joints
50 ~ 90% of STD for Soft joints SPEED CHANGE (TORQUE)
Engineered fastening specification at which angle control begins SNUG (TORQUE)
RECOMMENDATION FUNCTION
Chapter 6: Fastening Instructions (Rev. 8/98)
Page 6-4