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wheel balancing

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carlossa52(at)gmail.com
Guest

Posted: Thu Sep 22, 2011 8:45 am Post subject: wheel balancing

Brad, I believe the procedure you described might not work in all cases.

For instance, if you have two identical heavy spots opposed in relation to the wheel centre, it would still wobble.

I tried to illustrate this in the picture below.

  The red marks represent the "heavy spots". As the wheel spins, the centrifugal force at these spots will try to twist the tire, and it will wobble - despite the fact that the CG is on the axle.

[img]cid:ii_13291feb4c7f5ae3[/img]

  

Carlos



On 22 September 2011 12:19, Brad Rawls <Brad(at)ocbis.com (Brad(at)ocbis.com)> wrote:

 	  Quote: 	
		    

Yes, you just need to have it ‘eyeball’ level.

 

Thanks - Brad  

 

Brad Rawls

Orange County Brokerage

[url=tel:714-550-0159]714-550-0159[/url] voice  

[url=tel:714-550-0869]714-550-0869[/url] fax

Brad(at)ocbis.com (Brad(at)ocbis.com)  



 

From: owner-zenith601-list-server(at)matronics.com (owner-zenith601-list-server(at)matronics.com) [mailto:owner-zenith601-list-server(at)matronics.com (owner-zenith601-list-server(at)matronics.com)] On Behalf Of Paul Mulwitz

  Sent: Wednesday, September 21, 2011 4:10 PM

To: zenith601-list(at)matronics.com (zenith601-list(at)matronics.com)

Subject: Re: Re: Zenith601-List Digest: 2 Msgs - 09/20/11  

 

Hi Brad,



I think I got it.  



Do you hold the axle horizontally to spin the wheel?



Paul



On 9/21/2011 3:39 PM, Brad Rawls wrote:   

Paul –

 

I had a 180 MPH dragster that used the small aircraft wheels and tires we are dealing with, and it’s very easy to balance them at home. Just level the spindle,  remove the grease and seals from the bearing,  lube the bearings with a light oil, assemble the wheel and bearings on the spindle but only put the spindle nut on where it is just touching the bearings. Give it a light spin and wait for it to stop. The heavy part of the tire will be at 6 O’clock, mark the tire at the position. Do it a couple of times to verify the heavy spot always ends up at 6:00. After that, all you need to do is get some of the stick-on tire weight and apply them opposite the heavy mark until the tire balances. Make sure you clean the wheel real well with solvent before putting the stick-on weights on.  On the drag cars we used to put a layer of racer tape over the weight as a precaution, but the stick-on weight glue is really good.  

 

Thanks - Brad

 

Brad Rawls

Brad(at)ocbis.com (Brad(at)ocbis.com)

- The Matronics Zenith601-List Email Forum -

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Brad(at)ocbis.com
Guest

Posted: Thu Sep 22, 2011 9:43 am Post subject: wheel balancing

Carlos –

 

I see your point, but I not sure that would be a real world problem with the small diameters and strong sidewalls we are working with.  I was giving Paul a method to use at home as opposed to taking the wheel to a tire shop. A shop would most likely bubble balance the wheel, which is not going to cure the problem you describe.  Current spin balance machines would not correct for the problem you are describing either.  How would you balance the tire in your diagram?

 

Thanks - Brad

 

Brad Rawls

Orange County Brokerage

714-550-0159 voice

714-550-0869 fax

Brad(at)ocbis.com

 

From: owner-zenith601-list-server(at)matronics.com [mailto:owner-zenith601-list-server(at)matronics.com] On Behalf Of Carlos Sa

Sent: Thursday, September 22, 2011 9:42 AM

To: zenith601-list(at)matronics.com

Subject: Re: wheel balancing



 

Brad, I believe the procedure you described might not work in all cases.

For instance, if you have two identical heavy spots opposed in relation to the wheel centre, it would still wobble.

I tried to illustrate this in the picture below.

The red marks represent the "heavy spots". As the wheel spins, the centrifugal force at these spots will try to twist the tire, and it will wobble - despite the fact that the CG is on the axle.

[img]cid:image001.png(at)01CC7913.086380A0[/img]



Carlos

On 22 September 2011 12:19, Brad Rawls <Brad(at)ocbis.com (Brad(at)ocbis.com)> wrote:

Yes, you just need to have it ‘eyeball’ level.

 

Thanks - Brad

 

Brad Rawls

Orange County Brokerage

[url=tel:714-550-0159]714-550-0159[/url] voice

[url=tel:714-550-0869]714-550-0869[/url] fax

Brad(at)ocbis.com (Brad(at)ocbis.com)



 

From: owner-zenith601-list-server(at)matronics.com (owner-zenith601-list-server(at)matronics.com) [mailto:owner-zenith601-list-server(at)matronics.com (owner-zenith601-list-server(at)matronics.com)] On Behalf Of Paul Mulwitz

Sent: Wednesday, September 21, 2011 4:10 PM

To: zenith601-list(at)matronics.com (zenith601-list(at)matronics.com)

Subject: Re: Re: Zenith601-List Digest: 2 Msgs - 09/20/11

 

Hi Brad,



I think I got it.  



Do you hold the axle horizontally to spin the wheel?



Paul



On 9/21/2011 3:39 PM, Brad Rawls wrote: 

Paul –

 

I had a 180 MPH dragster that used the small aircraft wheels and tires we are dealing with, and it’s very easy to balance them at home. Just level the spindle,  remove the grease and seals from the bearing,  lube the bearings with a light oil, assemble the wheel and bearings on the spindle but only put the spindle nut on where it is just touching the bearings. Give it a light spin and wait for it to stop. The heavy part of the tire will be at 6 O’clock, mark the tire at the position. Do it a couple of times to verify the heavy spot always ends up at 6:00. After that, all you need to do is get some of the stick-on tire weight and apply them opposite the heavy mark until the tire balances. Make sure you clean the wheel real well with solvent before putting the stick-on weights on.  On the drag cars we used to put a layer of racer tape over the weight as a precaution, but the stick-on weight glue is really good.

 

Thanks - Brad

 

Brad Rawls

Brad(at)ocbis.com (Brad(at)ocbis.com)

- The Matronics Zenith601-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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carlossa52(at)gmail.com
Guest

Posted: Thu Sep 22, 2011 10:49 am Post subject: wheel balancing

I don't know how to fix it - I just thought this is the type of thing that can be done in a well-equipped shop...?



Carlos



On 22 September 2011 13:40, Brad Rawls <Brad(at)ocbis.com (Brad(at)ocbis.com)> wrote:

  [quote]

Carlos –  

 

I see your point, but I not sure that would be a real world problem with the small diameters and strong sidewalls we are working with.  I was giving Paul a method to use at home as opposed to taking the wheel to a tire shop. A shop would most likely bubble balance the wheel, which is not going to cure the problem you describe.  Current spin balance machines would not correct for the problem you are describing either.  How would you balance the tire in your diagram?  

 

Thanks - Brad

   

Brad Rawls

Orange County Brokerage

[b]

- The Matronics Zenith601-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Zenith601-List

psm(at)att.net
Guest

Posted: Thu Sep 22, 2011 11:05 am Post subject: wheel balancing

Hi guys,

     

     This is a very interesting method to balance the wheel and I'm sure     it would be easy to do.  Of course this would be messy since you     need to remove the wheel bearing grease and repack it, but getting     full of grease is not the end of the world.

     

     On the other hand, I never thought my wheel needs balancing.  If the     vibration I experience when touching down at higher speed (without     flaps) were from poor wheel balance then I would also experience it     when taking off at even higher speed.  I do not.

     

     I still want a way to damp the shimmy I get when landing at  higher     speeds with the nose wheel slightly misaligned with the runway.

     

     Paul

     

     On 9/22/2011 11:46 AM, Carlos Sa wrote:     [quote]I don't know how to fix it - I just thought this is       the type of thing that can be done in a well-equipped shop...?

       

       Carlos

       

       On 22 September 2011 13:40, Brad Rawls <Brad(at)ocbis.com (Brad(at)ocbis.com)>         wrote:

          	  Quote: 	
		                                         

Carlos –               

                

I see your                   point, but I not sure that would be a real world                   problem with the small diameters and strong sidewalls                   we are working with.  I was giving Paul a method to                   use at home as opposed to taking the wheel to a tire                   shop. A shop would most likely bubble balance the                   wheel, which is not going to cure the problem you                   describe.  Current spin balance machines would not                   correct for the problem you are describing either.                    How would you balance the tire in your diagram?               

                

Thanks -                   Brad               

                

Brad Rawls               

Orange                   County Brokerage

                            

           

         

	
     [b]

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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tonyplane(at)bellsouth.ne
Guest

Posted: Thu Sep 22, 2011 11:34 am Post subject: wheel balancing

FWIW. I have 6x600 tires/wheels all around on my XL. When I first flew it in July 05 I had a bad vibration problem which exhibited itself on lift off, from the nose wheel. I jacked up the nose, and by rotating the tire/wheel the tire would always go heavy side down. I bought some stick on weights at a local tire shop and installed them on the wheel's outside inner surface for balancing. Could spin the wheel after balance and it would stop at random locations. No more vibes after lift off. 

Tony Graziano

XL/Jab 3300; 630 fun hrs;  N493TG



Sent from myiPhone



On Sep 22, 2011, at 1:46 PM, Carlos Sa < (carlossa52(at)gmail.com)[url=mailto:carlossa52(at)gmail.com]carlossa52(at)gmail.com (carlossa52(at)gmail.com)[/url]> wrote:



 	  Quote: 	
		  I don't know how to fix it - I just thought this is the type of thing that can be done in a well-equipped shop...?



Carlos



On 22 September 2011 13:40, Brad Rawls < (Brad(at)ocbis.com) (Brad(at)ocbis.com)[url=mailto:Brad(at)ocbis.com]Brad(at)ocbis.com (Brad(at)ocbis.com)[/url]> wrote:

   	  Quote: 	
		  

Carlos â€“  

 

I see your point, but I not sure that would be a real world problem with the small diameters and strong sidewalls we are working with.  I was giving Paul a method to use at home as opposed to taking the wheel to a tire shop. A shop would most likely bubble balance the wheel, which is not going to cure the problem you describe.  Current spin balance machines would not correct for the problem you are describing either.  How would you balance the tire in your diagram?  

 

Thanks - Brad

   

Brad Rawls

Orange County Brokerage





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