FEC AFC1500 User Manual

Page 92

Chapter 6: Fastening Instructions

Page 6-6

6.1.2 Angle Control Method.

In Angle Control method, fastening is performed based upon attaining a desired torque value
and then rotating the fastener a specified number of degrees,

while monitoring the Torque of the

fastener and time. Additional monitor items (limits) can be set to enhance the systems ability to deter-
mine if the fastener was properly secured (Section 6.2).

Fastening can be performed from 1 to 3

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. (Angle
Control specs. are developed through testing of the joint and fastener characteristics and
therefore should not be attempted unless testing is performed)

NOTE: All setting recommendations are based upon common fastening applications.
Applications that experience high Prevailing torque, excessive joint compression or
other unique characteristics must be set with these characteristics in mind.

NOTE: When performing multiple step Angle control fastening, the rotation Angle
should be performed as one continuous operation. There should be no intermediate
stop/synchronization points once Snug Torque has been sensed and rotation angle is
being controlled. Under special conditions multiple steps can be performed using in-
termediate Torque or Angle stop/synchronization points.

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One-Step Fastening

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.

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.

5. The system will 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.

FUNCTION

RECOMMENDATION / COMMENT

SPEED CHANGE TORQUE

30% of SNUG TORQUE

THRESHOLD TORQUE

Start point of 1

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

torque rate monitoring (section 6.2)

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