JOSAM laser AM
Measuring system
26
Measurement of rigid axles
Total difference between front and rear measuring scales
Distance in meters between the measuring scales
Millimeter per meter
Toe-in/toe-out
Measurement of the rear axle C5/C6.
Hang frame gauges, gauge extensions and
measuring scales.
Jack up the axle.
Attach wheel adapter and laser projector.
Compensate for the run-out of the wheel with the
adjustment knobs on the adapter. Lower the axle.
Calculation
Measure the distance between the measuring
scales A1 and B1.
Record results on the Test Report Sheet.
For example: D = 6m.
Wheel C5 left side
Aim the laser dot at the measuring scale A1 left front.
Read the value.
For example: 110 Make a note on the
Test Report Sheet, square A1.
Aim the laser dot at measuring scale B1 left rear.
Read the value.
For example: 92 Make a note on the Test Report
Sheet, square B1.
Rolling direction of wheel C5 is the difference
between the readings of measuring scales A1 and
B1. 110 – 92 = +18.
Divide the difference +18 by the distance between
the measuring scales A1 and B1, D = 6m.
Result of + 18 : 6 = +3 (mm/m).
Write down 3 by C5/Dm and circle the (+) sign.
Wheel C6 right side
Aim the laser dot at the measuring scale A2 right front.
Read the value.
For example: 96 Make a note on the Test Report
Sheet, square A2
Aim the laser dot at the measuring scale B2 right
rear. Read the value.
For example: 108. Note it down in the Test Report
Sheet, square B2.
Rolling direction of wheel C6 is the difference
between the measuring scale readings of A2 and
B2. 96 – 108 = -12.
Result of -12 : 6 = -2 (mm/m)
Write down 2 by C6/Dm and circle the (-) sign.
Result can be calculated by using the table on page 20.
Calculate toe-in/toe-out
C5/Dm = + 3
C6/Dm = - 2
Result = + 1 (toe-in)
If + value is greater, the result is toe-in.
If the (– ) value is greater, the result is toe-out.
Draw rolling direction of the wheel with a solid line.
Draw the position of the axle with a solid line.
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