Wheel Mounting Errors; Wheel Repositioning Errors - Accu-Turn 1220 Manuel De L'opérateur

5.1.1-1
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Operations
5.1.1 5.1.1
Refer to Figure 5.1.1-1. Refer to Figure 5.1.1-1.
Regardless of the mounting method used, the wheel Regardless of the mounting method used, the wheel
must be centered before balancing. must be centered before balancing.
The wheel must be clean and free of debris, especially The wheel must be clean and free of debris, especially
where it mates with the cone or adapter and the where it mates with the cone or adapter and the
balancer flange. balancer flange.
Any dirt between the flange and the mating surface of Any dirt between the flange and the mating surface of
the wheel will cause misalignment on the shaft. the wheel will cause misalignment on the shaft.
A misalignment equaling fractions of an inch will cause A misalignment equaling fractions of an inch will cause
an imbalance of 0.50 ounces or more on automobile an imbalance of 0.50 ounces or more on automobile
wheels and 1 ounce or more on light truck wheels. wheels and 1 ounce or more on light truck wheels.
It is also critical that the wheel be tightened securely It is also critical that the wheel be tightened securely
to prevent it from slipping in relation to the flange during to prevent it from slipping in relation to the flange during
the measuring run. If the wheel slips on the balancer, the measuring run. If the wheel slips on the balancer,
accurate weight measurement and location are accurate weight measurement and location are
impossible and will cause customer dissatisfaction. impossible and will cause customer dissatisfaction.
5.1.2 5.1.2
A mounted wheel has a specific position, related to A mounted wheel has a specific position, related to
the balancer shaft reference point. the balancer shaft reference point.
If the wheel is rotated 180 degrees from the initial If the wheel is rotated 180 degrees from the initial
position on the stud and re-tightened, a different position on the stud and re-tightened, a different
imbalance reading may result. imbalance reading may result.
This is caused by mechanical tolerance on the wheel This is caused by mechanical tolerance on the wheel
mounting stud and if it happens, is almost always with mounting stud and if it happens, is almost always with
hub centric wheels. A mechanical tolerance, between hub centric wheels. A mechanical tolerance, between
shaft and cone or cone and the wheel center hole, of shaft and cone or cone and the wheel center hole, of
0.1 mm may result in an imbalance of 10 grams (.5 0.1 mm may result in an imbalance of 10 grams (.5
oz). oz).
To calculate the error due to wheel repositioning: To calculate the error due to wheel repositioning:
• Select a NORMAL wheel type. • Select a NORMAL wheel type.
• Spin the wheel. Note the imbalance. • Spin the wheel. Note the imbalance.
• Rotate the wheel 180 degrees from the initial • Rotate the wheel 180 degrees from the initial
position. position.
• Spin the wheel. Note the imbalance. • Spin the wheel. Note the imbalance.
• Subtract the readouts per plane. • Subtract the readouts per plane.
The difference between the two readings could be The difference between the two readings could be
as much as 15 grams (0.50 ounces) for cone- as much as 15 grams (0.50 ounces) for cone-
mounted automobile wheels and 60 grams (2 mounted automobile wheels and 60 grams (2
ounces) for light truck wheels. ounces) for light truck wheels.
• If the difference is greater, check the shaft, cones • If the difference is greater, check the shaft, cones
and the center hole of the rim for wear or damage. Try and the center hole of the rim for wear or damage. Try
different cones and/or rims to determine what causes different cones and/or rims to determine what causes
the repositioning error. the repositioning error.
• If the repositioning error cannot be removed, call • If the repositioning error cannot be removed, call
Technical Service. Accu Service.
The actual imbalance error is one-half of the The actual imbalance error is one-half of the
repositioning error. repositioning error.
Operator's Manual

Wheel Mounting Errors.

Wheel Mounting Errors.

Wheel Repositioning Errors.

Wheel Repositioning Errors.
ACCU 1220