FEC AFC1200 - Manual (Page 6)

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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 4 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 After presetting the fastening sequence (SET SEQUENCE Section 7.5) to perform
a one-step fastening, the System fastening parameters (PARAMETER SET
Section 7.1) 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 FINAL 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 THRESHOLD 2 TORQUE is
reached, the System will rotate the fastener the number of degrees specified by
FINAL ANGLE.
TORQUE
FINAL
ANGLE
1ST
STEP
ANGLE
THRESHOLD 2 TORQUE
SPEED CHANGE
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 FINAL 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 THRESHOLD 2 (TORQUE)
RECOMMENDATION FUNCTION
{ Two-Step Fastening
Chapter 6: Fastening Instructions User Console Version A3.53
Page 6-6