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Old 02-11-2011, 03:10 PM   #1
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On-axle tire and wheel balancing

I have found a local shop that does on-vehicle dynamic tire and wheel balancing that's willing to work on the trailer.

I figure this will cost less than centramatics and will also allow me to see just how far out of balance the assembly actually is at present.

Has anyone had this done?

Any advice?
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Old 02-11-2011, 04:05 PM   #2
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Keep on rolling!

I have never had this done in such a manner. I believe that having the whole rotating assembly balanced as a unit is a way, but not the best way to do it. If you are really concerned with the balance of your rotating assemblies I would recommend you have your tires balanced by any good tire shop and get them balanced again say every 5,000 miles. If you are really really really concerned with it I would have the hubs and drums removed and take them to a precision engine builder or machine shop and have them individually balanced as they would a crankshaft on a race car engine. That way all the rotating assemblies are balanced singularly and your balance will not be affected by removing or reinstalling any of the components.
This subject has been debated extensively here on the forums and also on the Vintage Airstream Podcast.

Prosit!
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Old 02-11-2011, 04:16 PM   #3
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most of the useful posts on this topic were written in 2002...

http://www.airforums.com/forums/f437...-gear-100.html

http://www.airforums.com/forums/f465...cing-1418.html

and by 2003 this was considered a regular quarterly topic...

http://www.airforums.com/forums/f465...cing-7621.html

http://www.airforums.com/forums/f438...time-3679.html

cheers
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Old 02-11-2011, 06:06 PM   #4
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I would get the Centramatics and be done with it...for a set of 4 you are looking at around $200....I have them on my triple axle and they make it smooth...
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Old 02-16-2011, 02:04 PM   #5
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Originally Posted by Jammer View Post
I have found a local shop that does on-vehicle dynamic tire and wheel balancing that's willing to work on the trailer.

I figure this will cost less than centramatics and will also allow me to see just how far out of balance the assembly actually is at present.

Has anyone had this done?

Any advice?
Usually, on vehicle balancing methods, use a single counter weight.

Each weight, as per Snap-on, namely the heavy spot and then the counter weight, affects 150 degrees of the circle.

That leaves 2 areas of 30 degree, unbalanced, if you wish. Therefore that type balancing has a short life of just a very few thousands of miles, perhaps 3 to 4 thousand at best.

When the running gear is properly balanced, a counter weight is placed 120 degrees away from the heavy spot. That then gives the circle overlapping balancing. That type, normally lasts 10,000 miles. I have used that method for over 40 years.

Or, a person can install the Centramatics, as an example, and be through with the question of balancing the running gear, as they continuously adjust for the tire wear as well. This is assuming, that the hub and drum assembly, is not "pounds" out of balance. Many of the old 3 piece hub and drum assemblies, were horribly out of balance.

That was somewhat corrected when the 2 piece hub and drums, became available many years ago. Today, hub and drums are "unicast" and are one piece, making it much easier to balance, and to keep in balance with devices such as the Centramatics.

Andy
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Old 02-16-2011, 02:43 PM   #6
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Andy,

I've always respected your posts and expertise but I'm having trouble reconciling what you just wrote with my understanding of Newtonian dynamics.
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Old 02-16-2011, 02:59 PM   #7
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Andy,

I've always respected your posts and expertise but I'm having trouble reconciling what you just wrote with my understanding of Newtonian dynamics.
Put fork lift tires on the trailer and watch what happens. And "E's" at 80 pounds are getting close to it. Then how about the maximum pressure the wheels can handle??

Why.

Rough ride. Always has, always will cause damage.

Same thing for a bad axle. Rough ride again.

Andy
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Old 02-16-2011, 04:08 PM   #8
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If I can find a guy to do on the hub dynamic balancing for me, I think I'll put on the Centramatics and have the dynamic balancing guy test the set up. I think weights are good, but not so final for me. The weights don't acknowledge the mud cake inside the rim that I thought I washed off or the tire wear. I may be anal. I'm sure I am.
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Old 02-16-2011, 06:56 PM   #9
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I always have new tires balanced with just the wheel. They will be in balance at that time, but as the tire wears, and rubber is removed, I can't see that they will still be in balance as the weights remain the same.

I installed Centramatics. This should take care of any imbalance in the hubs and drums, as well as the tire wear/balance weight issue, if there is one.

This should also resolve any balance issues which may arise if you want to rotate your tires.
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