User's Manual

Table Of Contents
Note
As a practical matter of safety, Emerson recommends using trial weights that are securely bolted or
welded to the rotor being balanced. Emerson does not warrant the applicability or safety of using
any weight glued or clamped onto a rotor, including those contained in this kit.
CAUTION!
Use these weights at your own risk. Exercise extreme caution when using weights such as
these. Never allow anyone to stand in the potential line-of-fire of a thrown weight.
Trial weights such as these may be thrown from the rotor during operation. To increase
safety, follow the suggestions below for increasing the holding strength when applying
clamp-on weights. These suggestions do not guarantee the weights are failure-proof.
Apply weights against an inner circumference of the rotor. Centrifugal force holds
the weight against the inner surface of the rotor, rather than pull the weight off the
rotor.
Apply weights so the set screws clamp behind or over a rim. If the weight starts to
slip, the set screws pull up against the rim.
If you cannot follow the previous suggestions, and you must clamp the weight to a
flat outer circumference of the rotor, enhance the holding strength by spot drilling a
location for the set screws. A few small weights may be more secure than one large
weight if the holding power of each weight is approximately equivalent.
If the trial run requires more than 10 to15 minutes of operation, secure the set
screws with a screw-locking compound or jam nuts to prevent vibration from
loosening the screws. Never leave clamp-on trial weights as permanent solution
weights.
Torque
It is easy to over-torque the screws, even when using a 3-inch allen wrench. After the trial
weight begins to yield excessively, you gain little or no additional strength by additional
torque. The metal may be over-stressed and lose strength. The weights are flexed
approximately 10 to 15 mils at the torques shown in the Trial Weight Data Summary table
that follows.
Trial weights data summary
A test was conducted using an Instron tensile testing machine. Each trial weight was
attached to a piece of cold rolled steel and the force required to pull the trial weight off
was measured. Applying these trial weights near or above these lines listed below is
obviously unsafe. Variations in exact weights, torques, surface hardness and condition
make it impossible to predict the true limits of usability for these weights. Tests were
conducted with three configurations:
1. Knurled cup point set screws at one side with no set screws on the opposing side.
2. Knurled cup point set screws at one side with cone point set screws on the opposing
side; only the knurled cup set screws were turned/torqued.
3. Knurled cup point set screws at both sides; all screws turned/torqued.
Balance
251
DRAFT