Static Mass Balancing: Procedure for Assemblies of 2.5-10kg

In summary, the procedure of static Mass Balancing of any assembly which has a total mass of 100 kg with subsystems which would assemble in it is to hang the complete system freely in air and then checking the placement of exact cenetr. There is no standard (like ASTM etc) for this particular testing, but we used to do it for weird shapes like automotive seat assemblies. The test is done by suspending the object from three points and then measuring the distance the object hangs from the ground.
  • #1
kashoo
41
0
What is the procedure of static Mass Balancing of any assembly which has a total mass of 100 kg with subsystems which would assemble in it is ranging from 2.5 to 10 kg ...
i think to hang the complete system freely in air and then checking the placement of exact cenetr is an appropriate method.
Is there any standard (like ASTM etc) for this particular testing.
 
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  • #2
We used to hang objects from three different points to determine CG. I can't think of anASTM spec for that though.
 
  • #3
What would those three points...Our Assembly is just like a cubical box...so whould we hang copmlete assembly form its top surface?
 
  • #4
It's been a while since I have done this (college) but, IIRC they were just random points spread out over the body. We used to do this for weird shapes like automotive seat assemblies.
 
  • #5
Yes, hand the object from three points. If the object is an extruded object (like...a 2-D object with constant cross section and some thicknes), then you simply hang the object from three points and draw a vertical line from that point straight down. Where the three lines intersect is the CG (in the center of the body of course). If your three lines intersect to form a triangle, then simply find the center of the triangle to find the center of the body.

Try this link for a lecture I remember for a lab that was on finding an objects center of gravity and moment of intertia:
http://www.eng.utoledo.edu/~cciocane/courses/mime3390_041sp/lec/m3_center_of_mass_and_mass_moment_of_inertia_lecture.doc [Broken]
 
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  • #6
Minger,
After browsing that you reminded me of the test we would do to determine the mass moment of inertia of rotor disk assemblies. The pendulum test works pretty well once you get the hang of it. It really isn't necessary now with complex models and Pro/E. Occasionally we have a legacy piece that that test still needs to be performed.
 

1. What is static mass balancing?

Static mass balancing is a procedure used to achieve equilibrium in an assembly of objects that weigh between 2.5-10kg. It involves carefully redistributing mass within the assembly to ensure that the center of mass is located at the desired point.

2. Why is static mass balancing important?

Static mass balancing is important because it ensures that an assembly is stable and does not tip over or vibrate due to an imbalance in weight distribution. This is particularly crucial in applications where precision and stability are required, such as in aircraft or industrial machinery.

3. How is static mass balancing performed?

The procedure for static mass balancing involves determining the center of mass of the assembly, identifying any imbalances, and adjusting the mass distribution by adding or removing weights until the center of mass is located at the desired point. This can be achieved through various methods such as trial and error, mathematical calculations, or using specialized equipment.

4. What are the benefits of static mass balancing?

Static mass balancing has several benefits, including improved stability and performance of an assembly, increased safety, and reduced wear and tear on components due to vibrations. It also helps to minimize the need for maintenance and repairs, ultimately saving time and costs.

5. Are there any limitations to static mass balancing?

While static mass balancing is an effective procedure, it does have some limitations. It cannot correct for dynamic imbalances, which occur when the mass distribution changes during operation. It also requires precision and careful consideration to achieve optimal results. In some cases, alternative methods such as active balancing may be necessary to achieve balance during operation.

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