used as pivots for the shaft lock, if provided). Insert a big screwdriver between the upper and
rear distance bolts. Lift the handle of the screwdriver in order to push the motor backwards
and tighten the upper screw (10-mm width across flats).
The initial tension of a new Multirib belt should be set to 200 N (Newton). When re-adjusting
or checking a belt fitted several days ago, 150 N is sufficient, since the belt has already
stretched and tension is not likely to decrease any further.
Belt tension should be checked and be re-adjusted if necessary.
The following belt tension meters are suitable alternatives:
Optikrik I of Messrs. Arntz-Optibelt-KG, Postfach 100132, D-37669 Höxter
(www.optibelt.com) or the
TRUMMETER by HILGER u. KERN Antriebstechnik, Käfertaler Straße 253, D-68167
Mannheim (www.hilger-kern.de).
The TRUMMETER derives the belt tension T [N] = 4 * m * L
2
* f
2
, where
m = linear belt mass in [kg/m] (m = meters),
L = length of belt free to vibrate in [m],
f = vibration frequency of free length of belt in [Hz] (measured by the TRUMMETER).
For the Multirib belt used with the Y2k passenger car vibratory assembly, the following
values have to be entered: m = 0.038 kg/m, L = 0.1689 meters.
For those gifted with perfect pitch, a tone of 183 Hz = 150 N / 212 Hz = 200 N should be
heard plucking the belt.
In future, belt tension checking should be supported by a service code.
15.5 The brakes
Within the Y2k balancing platform, there are a number of brakes of different design and for
various applications. All brakes have controlled torque, to avoid slippage of the wheel on the
adaptor, preserving counterweight positions.
Brakes for decelerating the main shaft after completion of unbalance measurement.
Shaft locks for blocking the rotation of the main shaft, actuated by the operator or under
program control.
Position brakes under program control for stopping of the slowly rotating main shaft,
with one of the compensation locations at the top (12-aclock) or other wanted position:
a) Braking at the compensation location of the left-hand plane after measurement.
b) Indexing to the compensation location of the right-hand plane with the aid of the drive
motor. c) Finding the next compensation location, with the operator slowly rotating the
wheel.
(so-called "sticky on top" function)
15.5.1 Brakes for decelerating after measurement
After completion of measurement, the main shaft, with the wheel clamped on, has to be
brought to a dead stop, for the operator to fit the counterweights or take the wheel off.
15.5.1.1 The Shaft band brake of the hand spin vibratory assembly
With the vibratory assembly EAA0277D45A used in the JBEG
b9000
, decelerating the main
shaft is initiated automatically.
The shaft band brake and the accompanying solenoid are equivalent to that in the balco
balancers.
The band brake consists of two semi-circular band clamps of bronze, joint to a ring around the
main shaft. To make the braking torque adjustable, a rubber washer is placed between the link
plates at one of the screws. With the opposite screw, a steel washer is inserted. Different long
screws M8x25 versus M8x20 compensate the weight difference of the washers.
Seite 23 von 99
Summary of Contents for Snap-on Y2k
Page 1: ...SERVICE of the Y2k balancing platform Seite 1 von 99 ...
Page 2: ...The vibratory assemblies of the Y2k balancing platform L R L R S S M Seite 2 von 99 ...
Page 32: ......
Page 35: ...Seite 35 von 99 ...
Page 66: ...Seite 66 von 99 Figure 1 JBEG B9000 B9450 User Interface ...
Page 67: ...Seite 67 von 99 Figure 2 JBEG B9460 User Interface ...
