JOSAM laser AM
Measuring system
28
Measurement of rigid axles
Sliding scale AM86 A
Toe-in/toe-out
Measuring with sliding scale AM84 A axle C5/C6.
Hang frame gauges, gauge extensions and
measuring scales.
Jack up the axle.
Attach wheel adapter and laser projector.
Compensate for run-out of the wheel using the
wheel adapter adjustment knobs. Lower the axle.
Place the sliding scales onto both front measuring
scales A1 and A2.
Measure the distance between measuring scales
A1 and B1 and write it on the Test Report Sheet.
For example: D = 6m.
Wheel C5 left side
Aim the laser dot at the measuring scale B1 left rear.
Read the value. For example: 92
Move the sliding scale on the measuring
scale A1 left front and set the 0–line on 92.
Aim the laser dot on the 6m distance line on
the sliding scale.
On the bottom row read off rolling direction of
wheel +3 mm/m.
Write down 3 at C5/Dm in the middle field and
circle the (+) sign.
Wheel C6 right side
Aim laser dot at the measuring scale B2 right rear.
Read the value. For example: 108.
Move the sliding scale on the measuring scale A2
right front and set the 0–line on 108.
Aim the laser dot at the horizontal 6m distance line
on the sliding scale.
On the bottom row read off rolling direction of
wheel -2 mm/m.
Write down 2 at C6/Dm in the middle field and
circle the (–) sign.
Draw in rolling direction of wheel with a solid line.
Draw the axle position with a solid line.
If the laser dot lies inside the 0-line on the sliding
scale it is a (+) value.
If the laser dot lies outside the 0-line on the
sliding scale it indicates a (–) value.
Calculate toe-in and toe-out
C5/Dm = + 3
C6/Dm = - 2
Result = + 1(toe-in)
Sliding Scale AM86 A
On the sliding scale AM86 A the result on the
bottom row is indicated in minutes instead of mm/m.
