>You have spent the last umpty upmth posts nitpicking the static load
>equation while others have said yeah but there are even worse problems
>even if you are right about the 1340 up and down vector component
>associated with the weight of the coach.
Even though I'm in the "don't change this one" camp on wheels offest even
more than the alcoas, I respect Zak's desire to have a complete and correct
engineering analysis of the steering components in order to make
an.informed decision regarding wheel offsets on the GMC.
There's a reason why GMC specified the comparatively short service interval
for the front wheels bearings. It may have nothing to do with real bearing
wear. But then it may have everything to do with safety due to wear. I
doubt that we'll ever get access to the design analysis that GM engineers
did in the devlopment of the coach. So, it would be nice to create a
complete and accurate suspension model for those folks who want to make a
fully informed decision on any number of topics: wheels offset, coach
loading, replacement part suitability, and the like.
>
>I am going to contact the author (who was not Wes) and convey your
>concerns about his findings. I bet we hear something like "the 11,190#
>numbers are correct at the extreme ends of each bearing (one up and one
>down) and that is the point where maximum compressive forces are exerted.
The analysis in the newsletter was a general back-of-the-envelope
calculation as far as I'm concerned. It doesn't address a lot of loading
factors. Nor does it tell us anything about the load bearing capabilities
of the suspension components themselves.
Arch went a long way in gathering failure anecdotes recently. They
indicated (logically) that the much-vaunted bearing "problem" didn't appear
to be a problem when the maintenance schedule was performed. IN some cases,
we learned that out of spec bearings can cause problems. Guess that piece
of information shouldn't come as big surprise!
Anybody interested in trying to model the suspension and its dynamic loads?
Henry
Going back to mangling metal brackets for new seats. '76 Palm Beach
Henry Davis Consulting, Inc / new product consulting
PO Box 1270 / product readiness reviews
Soquel, Ca 95073 / IP reviews
ph: (408) 462-5199 / full service marketing
fax: (408) 462-5198
http://www.henry-davis.com/ http://www.henry-davis.com
>equation while others have said yeah but there are even worse problems
>even if you are right about the 1340 up and down vector component
>associated with the weight of the coach.
Even though I'm in the "don't change this one" camp on wheels offest even
more than the alcoas, I respect Zak's desire to have a complete and correct
engineering analysis of the steering components in order to make
an.informed decision regarding wheel offsets on the GMC.
There's a reason why GMC specified the comparatively short service interval
for the front wheels bearings. It may have nothing to do with real bearing
wear. But then it may have everything to do with safety due to wear. I
doubt that we'll ever get access to the design analysis that GM engineers
did in the devlopment of the coach. So, it would be nice to create a
complete and accurate suspension model for those folks who want to make a
fully informed decision on any number of topics: wheels offset, coach
loading, replacement part suitability, and the like.
>
>I am going to contact the author (who was not Wes) and convey your
>concerns about his findings. I bet we hear something like "the 11,190#
>numbers are correct at the extreme ends of each bearing (one up and one
>down) and that is the point where maximum compressive forces are exerted.
The analysis in the newsletter was a general back-of-the-envelope
calculation as far as I'm concerned. It doesn't address a lot of loading
factors. Nor does it tell us anything about the load bearing capabilities
of the suspension components themselves.
Arch went a long way in gathering failure anecdotes recently. They
indicated (logically) that the much-vaunted bearing "problem" didn't appear
to be a problem when the maintenance schedule was performed. IN some cases,
we learned that out of spec bearings can cause problems. Guess that piece
of information shouldn't come as big surprise!
Anybody interested in trying to model the suspension and its dynamic loads?
Henry
Going back to mangling metal brackets for new seats. '76 Palm Beach
Henry Davis Consulting, Inc / new product consulting
PO Box 1270 / product readiness reviews
Soquel, Ca 95073 / IP reviews
ph: (408) 462-5199 / full service marketing
fax: (408) 462-5198
http://www.henry-davis.com/ http://www.henry-davis.com
