balancing rotating assembly
Thread Starter
Joined: Feb 2001
Posts: 4,988
Likes: 18
From: Czech Republic [www.rx7cz.net]
balancing rotating assembly
Ok, here's a deal
I am building 20B for my FC now and i found local guy who is able to do dynamic balancing up to 15k rpm and he is willing to do balancing of my stuff for free.
However, he has never did that for rotary and neither i know what exactly to tell him.
Can anyone explain me how its done when u have right equipment?
I understand balancing of eshaft, but i am bit confused about balancing eshaft with rotors on? How do you fix them the shaft, to prevent from spinning or moving sideways?
Sorry for dumb question
I am building 20B for my FC now and i found local guy who is able to do dynamic balancing up to 15k rpm and he is willing to do balancing of my stuff for free.
However, he has never did that for rotary and neither i know what exactly to tell him.
Can anyone explain me how its done when u have right equipment?
I understand balancing of eshaft, but i am bit confused about balancing eshaft with rotors on? How do you fix them the shaft, to prevent from spinning or moving sideways?
Sorry for dumb question
You don't use the rotors on the shaft while spinning it. There are bob weights that are clamped on in their place.
Most balancer manufacturers have the specs available, he may be able to get info from them. The guy I use just called and they faxed them to him.
I do know they don't spin them all the way up to your top rpm. IIRC the number I saw was about 2000rpm on the balancer.
Most balancer manufacturers have the specs available, he may be able to get info from them. The guy I use just called and they faxed them to him.
I do know they don't spin them all the way up to your top rpm. IIRC the number I saw was about 2000rpm on the balancer.
Senior Member
Joined: Aug 2002
Posts: 419
Likes: 1
From: Sundbyberg,Sweden
I have a Turner balancing machine that i balance my rotary engines on, It's accurate within 0.1 grams up to 10 grams and 1 grams above. It has 2 sensors and i have balance 1 to 3 rotors on it.
Of course i balance each rotor to get as close to zero as possible. Then i mount my bobweights on the E-shaft and the 2 counterweights. I am taking in concern the oil and the weight and the seals on the rotor. Usually a REW engine is unbalanced from 5-10 grams, and the degree,angle of the counterweigts is adjusted with a drill. When i'm close to 1 grams i mount the flywheel and at last the clutch. I also have Tungsten, heavy metal for some engines. If you are intersted in having your rotary engine balanced by me send me a PM.
/Lasse
Of course i balance each rotor to get as close to zero as possible. Then i mount my bobweights on the E-shaft and the 2 counterweights. I am taking in concern the oil and the weight and the seals on the rotor. Usually a REW engine is unbalanced from 5-10 grams, and the degree,angle of the counterweigts is adjusted with a drill. When i'm close to 1 grams i mount the flywheel and at last the clutch. I also have Tungsten, heavy metal for some engines. If you are intersted in having your rotary engine balanced by me send me a PM.
/Lasse
Only Cosmo, REW, or GTU Rotors, will balance, and be within tolerance with OEM 20b CW's originally balanced by Mazda.
Now I'm confused! I thought all S5 NA rotors weighed the same as Rew and Cosmo rotors? What's the difference with the GTU rotors?
Rotary tuner
Joined: Feb 2004
Posts: 124
Likes: 0
From: In Sweden
Higgi...
There are a few things you need to do to get a correct rebalance.
As Carlos (CLR) wrote you need to match all rotors and make them ready for the shaft.
After that you need to be sure that you calculate the correct weight for the rotor dummy weights.
When you have calculate the weight you need to create a dummy that you put on the shaft that compensate for the weight of rotor seals and so on.
When you done that then you need to set up the dummy weights on right position on the shaft.
If you do this then you are on the right way to do a good rebalance.
Iv'e been doing this for nearly 20 years and it's no problem to do a good balance as long as you do it the right way.
So you need to find how to calculate the bob weight and how to set up the assembly and then you can start doing your own rebalance.
There are a few things you need to do to get a correct rebalance.
As Carlos (CLR) wrote you need to match all rotors and make them ready for the shaft.
After that you need to be sure that you calculate the correct weight for the rotor dummy weights.
When you have calculate the weight you need to create a dummy that you put on the shaft that compensate for the weight of rotor seals and so on.
When you done that then you need to set up the dummy weights on right position on the shaft.
If you do this then you are on the right way to do a good rebalance.
Iv'e been doing this for nearly 20 years and it's no problem to do a good balance as long as you do it the right way.
So you need to find how to calculate the bob weight and how to set up the assembly and then you can start doing your own rebalance.
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Thread Starter
Joined: Feb 2001
Posts: 4,988
Likes: 18
From: Czech Republic [www.rx7cz.net]
Higgi...
There are a few things you need to do to get a correct rebalance.
As Carlos (CLR) wrote you need to match all rotors and make them ready for the shaft.
After that you need to be sure that you calculate the correct weight for the rotor dummy weights.
When you have calculate the weight you need to create a dummy that you put on the shaft that compensate for the weight of rotor seals and so on.
When you done that then you need to set up the dummy weights on right position on the shaft.
If you do this then you are on the right way to do a good rebalance.
Iv'e been doing this for nearly 20 years and it's no problem to do a good balance as long as you do it the right way.
So you need to find how to calculate the bob weight and how to set up the assembly and then you can start doing your own rebalance.
There are a few things you need to do to get a correct rebalance.
As Carlos (CLR) wrote you need to match all rotors and make them ready for the shaft.
After that you need to be sure that you calculate the correct weight for the rotor dummy weights.
When you have calculate the weight you need to create a dummy that you put on the shaft that compensate for the weight of rotor seals and so on.
When you done that then you need to set up the dummy weights on right position on the shaft.
If you do this then you are on the right way to do a good rebalance.
Iv'e been doing this for nearly 20 years and it's no problem to do a good balance as long as you do it the right way.
So you need to find how to calculate the bob weight and how to set up the assembly and then you can start doing your own rebalance.
Thanks for input guys, i will see what local guy is capable of and let u know how it ended up
