Coats ProRide Wheel Balancer User Manual download pdf (Page 26)

22 • Important: Always read and follow instructions.

Match Balance (Optimization)

WARNING

Match Balance involves the loosening of

tire beads and the inflation of a tire. Training

is necessary in tire changer operation and

understanding the dangers involved dur-

ing bead seating and tire inflation before

attempting this stage of the Match Balance

procedure. Read the operators manual sup-

plied with the tire changer and consult a

supervisor.

Match Balance (Optimization)

The symbol is displayed automatically for static

out of balance exceeding 30 grams (1.1 oz.)

Use the Match Balance (Tire/Rim Weight Optimiza-

tion) program to determine the best mating of tire and

rim that will result in the least amount of total out of

balance of the assembly. It requires two spins and two

rotations of the tire on the rim. Match Balance may be

needed when:

• The customer complains of ride problems.

• The balancer calculates a high out of balance.

• The balancer calls for Total Static weights in excess

of 3 ounces (85 grams) on passenger car tires.

Having performed a balancing spin:

Press + and follow the on-screen

instructions.

Figure 23 - Optimization

Important: A high out of balance may indicate the

improper mounting of the assembly on the balancer, or

a rim that is out of round or misformed, or a tire with a

bubble or other problem. If the out of balance is exces-

sive, it may be prudent to replace the rim, the tire, or

both. If either is replaced, do not continue with Match

Balance. Balance the new tire and rim and evaluate the

readings.

If you choose to use Match Balance to correct for a

condition, such as a large static out of balance, then

follow the on-screen instructions for the MATCH BAL-

ANCE procedure as outlined in the following steps.

Note: Use this procedure only after the wheel has

spun and the corrective weight amount is displayed.

Note: Presetting of tolerance on the machine. There is

no general rule concerning acceptability of a Max True

Runout Limit (see Balancing Set-up) value. As a first

approximation we consider it correct to use a threshold

of 1 to 1.5 mm.

The much enlarged figures show the outer tire surface

and axis of wheel rotation.

Figure 24 - Runout Measurements

Fig. A - shows measurement of the total Peak-to-Peak

runout defined as maximum radial deviation of the tire

surface.

Fig. B - shows measurement of the runout of the

1st harmonic, i.e. the eccentricity of that circle which

“recopies” the tire shape, by averaging the local devia-

tions of the tire from the round shape.

Obviously the P.P. measurement is normally greater

than that of the 1st harmonic. Tire manufacturers nor-

mally supply two different tolerances for the two eccen-

tricities. The radial and lateral runout measurements

are automatically carried out after the out of balance

measurement without having to go into particular pro-

cedures. Remember to position the sonar sensors in

front of the surface to be measured before pressing the

button.

The maximum limit of the first harmonic can be

set (MAX. TRUE RUNOUT LIMIT). When this limit is

exceeded, the wheel balancer displays a warning and

diagnostic frame indicating an eccentricity condition

that needs to be corrected.

A B

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Coats ProRide Wheel Balancer User Manual Page 26

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