hi friends:

what is material of trial weight i must used and how ,where can i support it to do field balancing ,???
i have got balancing machine from this company :cemb.com they give me clay to used it as trial weight but i feel it is not practiacal
if there is any suggestion will be gratefull.

i will appressiate for every one help.
is there any balancing articles dicuss this point??

best regrds

clay or puddy can be used as a trail in a corner when the corner is in the proper plane and won't sling off or go into the system that could be contaminated or worse have a very adverse effect w/product. Is slinging off and loss of life of any value? Maybe it should be considered. SS rotor? Fiberglass? Carbonfiber?

Any experience whatsoever?

quote:

where can i support it to do field balancing ,???
i have got balancing machine from this company :cemb.com they give me clay to used it as trial weight but i feel it is not practiacal

Most all field balancing jobs have their own way to do things. Close inspection of each rotor is the best way to determine how and where to attach a trial weight.
Each balance person also has their own way of doing things.
One might like bolt on weights, another might like weld on trial weights, another might want both, bolt it on then tack weld it. As far as "clay" goes for a trial weight, it works if there is a place to attach it where centrifugal force will hold it in place or there is some sort of a cavity to attach it in.

You can make some split weights with set screws to attach or buy some from one of the many companies which make balance weights.

If you are new at this, it might be wise to seek some professionial help in training or assisting you to begin with. Balancing is basically easy but there are some dos and don'ts one needs to know before venturing out on one's own. Where is "Yemen"? Too far from "Mississippi" I bet.

Only my opinion and I could be totally wrong.

This message has been edited. Last edited by: Ralph Stewart,

Vendor Warning – vnistra800, we have been manufacturing machinery balancing correction weights for Balancing Consultants and O.E.M. manufacturers for over 16 years. The location of our new office/wharehouse might interest you!

After numerous requests from our European friends and customers, we opened an office in Europe this summer
We have manufactured and stocked a full line of metric balancing correction weights and metric stainless steel alignment shims specifically for the European and surrounding market. As always, these balancing products and alignment shims are available for same day shipment. Our European manager comes with five years of experience managing our Canadian Operation.

All products are ROTH compliant, a European initiative which is quickly making it's way to North America.

For more information visit www.balancingweights.eu.com


I would strongly recommend a machinery balancing manual published by the Balancing Systems Group. They are a group of Balancing Professionals who have many, many, many years of balancing experience, and who have pretty much seen it all. We offer the manual as a customer service, or you can order it from them at www.balancingusa.com.
All the best with your initiation to the world of balancing.

Zane

Zane,

That is a great selection of balance weights.

Hello vibe folks,
Reading this topic make think of some things... Does any of you knows cheap manufacturer of balance weigh from 150g to 500g with an opening of 1 inch? We have to get them custom made locally and they become quite expensive.

Thanks, Marcel

Thanks William. Over the years we have "fine tuned" our balancing weight and custom stamping capability. Many of our improvements and products are a result of discussions with Balancing Professionals such as yourself.

Marcel, please visit www.balancingweights.ca (our Canadian office) for product and contact info.

Regards;

Zane

HI,
The throat size are way too small! I need throat size of 1 inch with weight range from 5 oz to 18 oz.

Marcel

Marcel, thanks for the reply. Your specs will require some slight modifications to our standard production run. You may already have the best solution with your current customized balancing weights. Probably better to discuss the details via phone. If you wish to pursue call our Canadian office or e-mail me.

Attn: Zane

info(at)balancingweights.com

Have you tried standard threaded hex nuts? I don't at present have access to a Machinery Handbook but I think the minor diameter of a 1-1/8 12NC internal thread is just slightly over 1 inch (something like 1.025). They would probably be the cheapest thing out there and statistically would run very consistent weights especially when purchased from the same manufacturer. In any given size you would have essentially three weights available. Pull some from your local stockroom and see what range of weights they would yield.

"Regular Finished" hex nuts - the width across the flats of the hex is one-and-a-half times the nominal diameter. Thickness is approximately 90% of the the nominal diameter.

"Heavy" hex nuts - generally the width across the flats is 1/8 of an inch larger than common hex nuts and the thickness is equal to approximately the nominal diameter.

"Regular Finished Jam" hex nuts - sometimes referred to as thin nuts, are approximately 65% as thick as a standard hex nut.

Just a thought, might work and be an inexpensive solution.

John

hi friends:

thanks for everyone interst about my question and try to answer me .
but until now no body answer me the original question ?
what is the material of trial and correction weight i must used and metods of support it for different type of rotors :electrical armature , impeller fan , ..etc???

really i need for every one help me
i will appressiate for him
best regrds

HI vnistra800,
I hope that it is not your birth name... You are right, we kind of turn around the question. I am an analysis from an iron Ore Company so I can't really tell you what other are using. Here we have pre-made "C" clamp that we screw onto the palm of the fan. We sometime weld bolts or steel plate on, it depends on the weigh we need and either you want something permanent or not. Here we balanced those fans quite often so we like to have them clamped most of the time. I would say that as long that you know exactly the weigh and that it is securely fixed it doesn't really mater. Zane's link has a kit that seems to fit pretty much every situation. I'll joint a little drawing of the type of "C" clamp we uses. Hope that I finally answer your question.

Best regard, Marcel

MBEL010.xls (40 Kb, 21 downloads)

vnistra800

A detailed answer to your question is difficult since there are a lot of variables. (i.e. machine type, speed, rotor diameter, access, experience of the person balancing, and much more.) I believe Ralph answered your question best. At least as well as a complex question like this can be answered on a maintenance forum. An investment in resource materials and training would be the best course of action. Again, companies like the Balancing Systems Group (www.balancingusa.com) as well as the balancing machine manufacturers themselves are one source for this training. Be patient and careful, this experience does not come over night.

I have always had a general rule,( with some flexibility based on the experience of the person or company venturing into predictive maintenace). An initial investment in instrumentation in this industry must be matched with an equal investment in training resources for the personnel involved.

Sorry I could not be of more help!

Zane

P.S. Your location now is NY??? Your original post was Yemen.

This message has been edited. Last edited by: Zane,

A couple simple balance references can be found on our web site. Both of these are based on the 4-run balance method, which can be done with any vibration-measurement instrument. They also have some recommendations about possible trial weights.

Application Note #6 - 4 Run Balancing:
http://www.spintelligentlabs.com/SL-docs/an-6.pdf

Four-Run Balance Tutorial:
http://www.spintelligentlabs.com/SL-docs/4runtutorial.pdf

These references may help give you a feel for in-place balancing.

Jon
Spintelligent Labs