Reply
 
Thread Tools Search this Thread Display Modes
 
Old 12-17-2010, 04:26 AM   #15
Rivet Monster
 
wahoonc's Avatar

 
1975 31' Sovereign
1980 31' Excella II
Sprung Leak , North Carolina
Join Date: Jun 2003
Posts: 7,174
Images: 40
As IRV pointed out getting complete hub assemblies balanced is all but impossible. I had access to a shop that could do it, however that shop is no longer in business.

I haven't had any experience with Dynabeads

Centramatics are good for the life of the trailer. . We use Centramatics on a fleet of trucks ranging from 1/2 ton up through 40 ton+ with great success. A new Airstream can cost upwards of $70,000, the cost of Centramatics is minuscule for the safety and quality ride they provide.

Aaron
__________________

__________________
....so many Airstreams....so little time...
WBCCI #XXXX AIR #2495
Why are we in this basket...and where are we going
wahoonc is offline   Reply With Quote
Old 12-17-2010, 06:37 AM   #16
Rivet Master
 
boatdoc's Avatar
 
1973 Argosy 26
Norristown , Pennsylvania
Join Date: Sep 2006
Posts: 644
Images: 1
Quote:
Originally Posted by nairnchyz View Post
You can get your tires balanced but your hubs will not be balanced and an out of balance hub can shake your trailer to pieces.
Hi nairnczyz;
With as much as I hate to sound controversial I must dispute your statement. All domestic made hubs are balanced. The proof of it is in welded small strips of steel onto the hubs. I have 12" brakes on my 26' Argosy. Before installing my new hubs we have placed them on crankshaft balancer and found out that differences were much too small to worry about at 12" diameter. Rims and tires are a different story being further from the center. Originally when building a new SS frame we installed shock mounts but decided not to install them on my new 3500lbs Dexter torsion axles. Even after near perfect balancing of the tires my trailer experienced vibrations which made things slide around inside for first 1000 miles. This test was done in order to find Merritt in statements made on the forums claiming that shock absorbers are not necessary on Airstreams. After installing new shocks everything stays in place even when driving on horrible pothole covered Pa, Rt 390. Thanks, "Boatdoc"
__________________

__________________
boatdoc is offline   Reply With Quote
Old 12-17-2010, 08:38 AM   #17
and my trusty lab Helga
 
handyman1425's Avatar
 
1972 29' Ambassador
1985 32' Excella
Cowiche , Washington
Join Date: Sep 2009
Posts: 32
Images: 5
Parden me but i am new to the centramatic thing are yuall talking about putting spinners on your coach? What exactly are centramatics?
__________________
handyman1425 is offline   Reply With Quote
Old 12-17-2010, 08:39 AM   #18
Rivet Master
Airstream Dealer
 
Inland RV Center, In's Avatar
 
Corona , California
Join Date: Feb 2002
Posts: 16,499
Images: 1
Quote:
Originally Posted by boatdoc View Post
Hi nairnczyz;
With as much as I hate to sound controversial I must dispute your statement. All domestic made hubs are balanced. The proof of it is in welded small strips of steel onto the hubs. I have 12" brakes on my 26' Argosy. Before installing my new hubs we have placed them on crankshaft balancer and found out that differences were much too small to worry about at 12" diameter. Rims and tires are a different story being further from the center. Originally when building a new SS frame we installed shock mounts but decided not to install them on my new 3500lbs Dexter torsion axles. Even after near perfect balancing of the tires my trailer experienced vibrations which made things slide around inside for first 1000 miles. This test was done in order to find Merritt in statements made on the forums claiming that shock absorbers are not necessary on Airstreams. After installing new shocks everything stays in place even when driving on horrible pothole covered Pa, Rt 390. Thanks, "Boatdoc"
So much for the "no shocks needed" myth.

Our inspections of new style hub and drums, do not show any evidence of balancing. We further have tested all to many new style hub and drums, with our "Snap on balancer".

Regretfully, once again, no evidence of balancing has been found.

Our balancer, pictured in our web site, can balance to a very small fraction of an ounce. As a demonstraion, we show some customers that even the weight of a clean mens white hanky, placed off center at the top of the running gear assembly, is more than enough weight to make the assembly rotate.

Today, I will measure the weight of a like hanky, and post the results.

Andy
__________________
Inland RV Center, In is offline   Reply With Quote
Old 12-17-2010, 09:52 AM   #19
Moderator
Commercial Member
 
eubank's Avatar
 
1967 30' Sovereign
Bosque Farms , New Mexico
Join Date: Jan 2004
Posts: 6,423
Quote:
Originally Posted by Inland RV Center, In View Post
Today, I will measure the weight of a like hanky, and post the results.
Andy
Ah, now, is that with or without the contents of the hanky?

Sorry, I just couldn't resist!


Lynn
__________________
WBCCI 21043
eubank is offline   Reply With Quote
Old 12-17-2010, 10:03 AM   #20
Rivet Master
 
dznf0g's Avatar

 
2007 30' Classic
Oswego , Illinois
Join Date: Jul 2010
Posts: 9,402
Images: 5
Centramatics (or the others) will help with load force balancing issues with tires as well. I suspect (no proof) that ST tires are not produced with the same attention to details such as load force imbalance as vehicle tires.

You will never get this issue addresses with the spin balancers at most shops.
__________________
dznf0g is offline   Reply With Quote
Old 12-17-2010, 10:31 AM   #21
Rivet Master
 
ZoominC6's Avatar
 
2004 30' Classic Slideout
Colleyville , Texas
Join Date: May 2005
Posts: 1,502
Couldn't imagine running without our Hensley, Centramatics or Insurance of any kind for that matter.
__________________
In dog years, I'm dead!
ZoominC6 is offline   Reply With Quote
Old 12-17-2010, 11:36 AM   #22
Rivet Master
Airstream Dealer
 
Inland RV Center, In's Avatar
 
Corona , California
Join Date: Feb 2002
Posts: 16,499
Images: 1
Quote:
Originally Posted by eubank View Post
Ah, now, is that with or without the contents of the hanky?

Sorry, I just couldn't resist!


Lynn
As promised, we weighed a perfectly clean, mens white hanky, absolutely dry, AND no solids, at 12.8 grams which is .42 ounces.

A ST 225/75 R15 load range "D" tire weighs 30 pounds, the steel wheel weighs 25 pounds and the hub and drum weighs 40 pounds, for a total of 95 pounds.

Placing the "clean" mens hanky, slightly off center of that assembly, that's mounted in our Snap-on balancer, will make the assembly rotate since it's now been off balanced with less than 1/2 ounce of weight.

It's unfortuante that Snap-on tools, decided years ago to discountinue the manufacture of that balancer. It has worked for me, personally for over 40 years.

It's also very sad, that in spite of our "space age" accomplishments, that it's very rare to find a shop, that can balance a tire, wheel and hub and drum, as an assembly.

Anything that spins, must have some form of balancing, and the greater the weight as well as the greater the speed, makes that balancing even more important.

I wonder what would happen to a jet engine, revved up to flight RPM, if it was not very finely balanced? I would guess, that it would explode.

Andy
__________________
Inland RV Center, In is offline   Reply With Quote
Old 12-17-2010, 11:47 AM   #23
Rivet Master
 
boatdoc's Avatar
 
1973 Argosy 26
Norristown , Pennsylvania
Join Date: Sep 2006
Posts: 644
Images: 1
Quote:
Originally Posted by eubank View Post
Ah, now, is that with or without the contents of the hanky?

Sorry, I just couldn't resist!


Lynn
I do not blame you Lynn. Lets get serious here. How much difference can a quarter ounce make at five inches radius from center of rotation when 2000 lbs is sitting on a tire? What about out of round tires even if they are perfectly balanced? Thanks, "Boatdoc"
__________________
boatdoc is offline   Reply With Quote
Old 12-17-2010, 11:49 AM   #24
Rivet Master
Airstream Dealer
 
Inland RV Center, In's Avatar
 
Corona , California
Join Date: Feb 2002
Posts: 16,499
Images: 1
Quote:
Originally Posted by boatdoc View Post
I do not blame you Lynn. Lets get serious here. How much difference can a quarter ounce make at five inches radius from center of rotation when 2000 lbs is sitting on a tire? Thanks, "Boatdoc"
All the difference in the world, as stated by several owners in their above posts.

Andy
__________________
Inland RV Center, In is offline   Reply With Quote
Old 12-17-2010, 11:52 AM   #25
Moderator
Commercial Member
 
eubank's Avatar
 
1967 30' Sovereign
Bosque Farms , New Mexico
Join Date: Jan 2004
Posts: 6,423
Good test, Andy! I've been a believer for some time now with our old rims and bias-ply tires from China. Basically, I have the tires roughly balanced at the shop and then rely on the Centramatics to take care of the details, including the hubs and drums.

Lynn
__________________
WBCCI 21043
eubank is offline   Reply With Quote
Old 12-17-2010, 11:54 AM   #26
Rivet Master
 
dznf0g's Avatar

 
2007 30' Classic
Oswego , Illinois
Join Date: Jul 2010
Posts: 9,402
Images: 5
Quote:
Originally Posted by boatdoc View Post
I do not blame you Lynn. Lets get serious here. How much difference can a quarter ounce make at five inches radius from center of rotation when 2000 lbs is sitting on a tire? What about out of round tires even if they are perfectly balanced? Thanks, "Boatdoc"
That's one of the components or possibilities of load force balancing, along with construction inconsistencies within the sidewall, not being seated exactly properly on the rim, etc.
__________________
dznf0g is offline   Reply With Quote
Old 12-17-2010, 12:59 PM   #27
Rivet Master
 
Jim Foster's Avatar
 
1965 17' Caravel
1983 27' Excella
Walnut Grove/Laguna Woods , California
Join Date: Jun 2004
Posts: 1,615
Send a message via Yahoo to Jim Foster
Quote:
Originally Posted by Inland RV Center, In View Post

It's unfortuante that Snap-on tools, decided years ago to discountinue the manufacture of that balancer. It has worked for me, personally for over 40 years.
I was a Snap-on dealer from 1977 until 1993. I agree with you Andy regarding those balancers. I used one to balance the flywheel in my VW powered dune buggy. They are a great tool.

The problem arose when the "automatic" balancers hit the market. They are far easier to use in that the operator doesn't have to do much thinking. They just mount the wheel, hit the green button and in a few seconds the machine tells them where to place weight and how much to place. For the most part, most of them work OK, and do save some time.

However, if you want to balance something other than a wheel and tire, they are useless. The old Snap-on balancer can be used to balance just about anything that can be mounted on it.

Hang on to yours.
__________________
Past President, El Camino Real Unit WBCCI#6620
Street Rod Builder (see avatar)
Kite flier (check out links below)
http://www.youtube.com/my_videos?feature=mhee
https://www.youtube.com/watch?v=6y1_U2XQ0bI
Jim Foster is offline   Reply With Quote
Old 12-17-2010, 02:18 PM   #28
Rivet Master
Airstream Dealer
 
Inland RV Center, In's Avatar
 
Corona , California
Join Date: Feb 2002
Posts: 16,499
Images: 1
Quote:
Originally Posted by Jim Foster View Post
I was a Snap-on dealer from 1977 until 1993. I agree with you Andy regarding those balancers. I used one to balance the flywheel in my VW powered dune buggy. They are a great tool.

The problem arose when the "automatic" balancers hit the market. They are far easier to use in that the operator doesn't have to do much thinking. They just mount the wheel, hit the green button and in a few seconds the machine tells them where to place weight and how much to place. For the most part, most of them work OK, and do save some time.

However, if you want to balance something other than a wheel and tire, they are useless. The old Snap-on balancer can be used to balance just about anything that can be mounted on it.

Hang on to yours.
I have 2 of them, you know "spares".

Andy
__________________

__________________
Inland RV Center, In is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Centramatic Balancers Update... dscluchfc Tires 221 09-09-2016 11:08 PM
Correct Centramatic installation ? 63air Wheels, Hubs & Bearings 10 06-02-2009 11:16 PM
Centramatic balancers. Inland RV Center, In Commercial Listings 7 03-24-2009 03:53 PM
Centramatic alternative? bake315 Axles 7 11-18-2004 05:16 PM
Centramatic Wheel Balances 53flyingcloud Axles 40 08-10-2004 05:01 PM


Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 06:03 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.