Standard

R State Standard £ Institutionally Developed College: NA

ACR 2240 - Unibody Measuring, Fixturing, and Straightening Systems
Course Description Provides instruction in a variety of alignment measuring, fixturing, and straightening systems. Topics include: universal mechanical measuring system/ equipment types and usage; universal laser measuring system/ safety procedures; dedicated fixture system/ primary/ rough and secondary damage pull; upper body panel/single pull correction; English/metric tape alignment measurement/multiple pull correction; and impact or pull stress relief.
Competency Areas	Hours
Universal Mechanical Measuring System/Equipment Types and Usage	Class	3
Universal Laser Measuring System/Safety Procedures	D. Lab	4
Dedicated Fixture System/Primary/Rough and Secondary Damage Pull	P. Lab/O.B.I.	3
Upper Body Panel Measurement/ Single Pull Correction	Credit	6
English/Metric Tape Alignment Measurement/Multiple Pull Correction
Impact or Pull Stress Relief

Prerequisite:
Corequisite:	ACR 1000, ACR 1010, ACR 1020, and ACR 1210

Course Guide

Competency	After completing this section, the student will be able to:	Hours
		Class	D. Lab	P. Lab/ O.B.I.
Universal Mechanical Measuring System/Equipment Types and Usage		5	9	5
Control points	Identify the four basic control points used in measuring frame damage.
Centering gauges	Demonstrate installing a set of four universal mechanical centering gauges and identify damage.
Measurements	Make diagonal measurements with tram gauge and/or English/metric tape.
Tram gauge and center line	Explain and measure a unibody using tram gauge and center line gauge.
Universal	Explain and measure a unibody with a universal measurement system.
Laser	Describe a laser measuring system.
Dedicated	Describe a dedicated measuring system.
	Demonstrate the ability to use pull tanners correctly.
Universal Laser Measuring System/Safety Procedures		5	3	5
Datum points	Identify datum measurements from a frame manual.
Master control bar	Demonstrate the use of a master control bar by centering, squaring, and leveling bar to the vehicle with attachments and Laser gun.
Measurements	Determine amount of damage by attaching two more control bars to damage and measuring with Laser gun and English/metric tape.
Safety Procedures	Follow and observe all alignment safety considerations.
Dedicated Fixture System/Primary/Rough and Secondary Damage Pull		5	5	5
Fixture locations	Duplicate location of fixtures on transverse beams of dedicated bench to mate with underbody control points of vehicle according to manufacturer’s specifications.
	Identify four of the more common types of fixtures used on the bench.
Measurements	Analyze damage and explain how to match fixtures to control points.
Correction sequence	Explain the pulling sequence of "Last In First Out" in relation to primary corrective pulls to secondary corrective pulls.
	Demonstrate the ability to correct primary and secondary damage.
Upper Body Panel Measurement/ Single Pull Correction		5	9	5
Measurement systems Specifications	Demonstrate the measuring process of the upper body panels and MacPherson strut systems using the different measuring systems and specification manuals available.
Safety	Follow all shop safety regulations.
Sequence and direction	Demonstrate the ability to correct primary and secondary damage with a series of single-direction pulls after developing a pulling sequence.
English/Metric Tape Alignment Measurement/Multiple Pull Correction		5	9	5
Measurement and conversion	Demonstrate the ability to measure using the English or the metric system and convert from one system to the other.
Sequence and direction	Demonstrate the ability to correct primary and secondary damage with a series of multiple pulls after developing a pulling sequence.
Impact or Pull Stress Relief		5	5	5
Damage identification	Identify stress/deformation on unibody vehicles.
Stress relief procedures	Define stress in the auto collision repair industry.
	Explain how stress can be caused in unibody vehicles.
	Demonstrate the ability to relieve stress in a unibody structure.

Suggested Resources

Media Print Audio/Visual Web Other
Print	Duffy, James E. Auto body repair technology (5^th Ed.). (2009). New York: Delmar – Cengage. Duffy, James E. Auto body repair technology (4^th Ed.). (2004). New York: Delmar Learning.

Posted: 08/19/09