Hofmann Snap-on Y2k, Service Manual

Page: 5 / 99

Another possibility to reduce the effects of force relations is an increased distance between
measuring planes as illustrated in
Fig. 3.
This condition is not always feasible for lack of
space and makes sense to a limited extent only because the left-hand measuring signal is
reduced and consequently the influence from fluctuations of measured values will increase.
Fig. 3 Measuring system with increased distance between measuring planes
Theoretically an inboard rotor with correction planes between the measuring planes such as
illustrated in
Fig. 4
can be considered an improvement as well.
Fig. 4 Inboard rotor with one measuring plane on every side of the rotor
Considering state-of-the-art technology this possibility is not feasible for automotive wheels
because at least one point of support will hinder clamping of the wheels.
It is now the idea for a new vibratory system to maintain the basic concept of an outboard
rotor, but to displace the two measuring planes virtually far outside the machine housing. The
measuring planes and points of support respectively will be displaced so far outside the
machine housing that the virtual measuring planes have no physical support on the machine
housing any longer. This means that independent of physical conditions the measuring planes
may be virtually located in optimum positions along the shaft axis which could cover the
whole range of wheels to be balanced.
Seite 5 von 99