| [GMCnet] REACTION ARM DETAIL DRAWINGS [message #104390] |
Wed, 27 October 2010 11:05  |
Charles Aulgur
Messages: 78
Registered: March 2006
Karma: 0
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Les posted:
Does anyone have any photos of the production reaction arm system
that clearly shows the inter-relation with the swaybar? I've only
seen photos of the versions where the arm connected to the bogie
frame bracket.
Les Burt
Sent from my iPhone
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If you go to the GMC Photo site and search foe Username "chuckieboy"
it will take to my photos. Go to the reaction arm Cad drawings and
you can review several of Rick Flanagan's CAD drawings showing how
all the piece parts fit together. I also have detailed instructions
on how to install the total system on a GMC. Also, there is another
group of my photos that I took when I installed my production system
which has the original reaction arm design that transfer the brake
loads to the bogie frame.
Yesterday I uploaded some photos of the air-operated parking brake
system that I have on my coach. It operates in the same way as when
you apply your OEM parking brakes. When you first start to raise the
parking brake, the micro-switch that makes a ground that turns your
dash parking light also provides a ground for a solenoid valve under
the coach that pressurizes the Monroe air-lift shock that extends and
applies and equal load on the two cables that go to the parking brake
calipers on the rear two wheels. As the air shock extends it rotates
a locking lever (like when you open one of your front hood doors)
into the "locked position. As you continue to raise the OEM parking
brake handle upward, the attached cable follows the motion of the
locking lever and when it reaches the top "locked" position it holds
the locking lever in the locked position and the air supply solenoid
valve is de-energized, venting the air from the air shock. This
parking brake application takes about one second which is
approximately how long it takes you to raise the OEM parking handle.
When the locking lever is moved into the locking position, the micro-
switch that turns off power to the air supply valve also turns on an
indicator light on my dash showing the air operated mechanism is
locked. When you release the OEM parking brake handle the locking
lever is released and a small coil spring compasses the air shock to
it's compressed position. This system applies several hundred pounds
of force to the parking brake handle and will hold my GMC on +8% grade.
There are also photos of a proposed production unit that I made for
Jim and Rick is modeling it on his CAD program. Jim doesn't thing
the concept will sell as two many people do not have "working"
compressors on their GMCs. My though is if they won't sent two or
three hundred $ for a compressor they most likely will not spend 5K$
for the reaction arm system.
Chuck Aulgur
La Mesa, CA
76 Royale with excellent brakes
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| Re: [GMCnet] REACTION ARM DETAIL DRAWINGS [message #104427 is a reply to message #104390] |
Wed, 27 October 2010 17:17  |
captjack
Messages: 271
Registered: February 2010
Location: Sebastopol, California
Karma: 1
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Senior Member |
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Chuck,
Your power parking brake is a great idea! The electric one seemed a bit more complex than necessary, but this idea takes advantage of the existing system, improves it, and is elegantly simple. I hope you and Jim do come to an arrangement to make it available - I'll buy one -- otherwise I might steal the idea for my coach.
Jack Christensen - K6ROW,
'76 Glenbrook/Clasco - "The Silver Bullet",
Sebastopol, CA
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| Re: [GMCnet] REACTION ARM DETAIL DRAWINGS [message #104442 is a reply to message #104390] |
Wed, 27 October 2010 19:53 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
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Senior Member |
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| Charles Aulgur wrote on Wed, 27 October 2010 09:05 |
... Jim doesn't thing
the concept will sell as two many people do not have "working"
compressors on their GMCs. My though is if they won't sent two or
three hundred $ for a compressor they most likely will not spend 5K$
for the reaction arm system.
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There are several different "levels" of GMC ownership. (How much $$$ is available for GMC repairs and upgrades.)
There are "many" that "2 or 3 hundred" puts an air compressor on the "want list." (I am not sure how many is "too" many.) I can understand "fixing" a malfunctioning air/leveling system with about $10 in parts from Ace hardware. (A pair of 1/4 inch tank valves.) It my be inconvenient to level the coach, but it gets the coach on the road. My '77 is currently like this... but it isn't a "usable" coach right now.
Even at the "higher" levels of GMC ownership, the cost alone will push the reaction arm system further down the want list.
BUT...
I am fairly sure that the reaction arm IS on almost "everyones" want list. How far down? ...depends on the coach (condition) and level of GMC ownership.
Now with that said...
I like the idea of an "air-operated parking brake system." But to install it on my current "in use" coach I would have to install an air compressor and maybe even an air tank. Not because it doesn't have a working compressor... it fact it has two. It is a late 1978 and has the EL2 system. I like the EL2 but it doesn't lend itself to providing air for uses other than the air bags.
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| Re: [GMCnet] REACTION ARM DETAIL DRAWINGS [message #104465 is a reply to message #104456] |
Thu, 28 October 2010 06:27 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
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Senior Member |
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| WD0AFQ wrote on Wed, 27 October 2010 20:11 |
... We will never have 2-3 GMCs like you, and others, do so all of our money goes into the one we use. We plan to keep this GMC running for at least another 20 years so I have to build it with that in mind. ...
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Dan,
If you add the current value of all 3 of my coaches together, it MIGHT be the same as your ONE coach. My three just take up more parking space. 
I also plan on keeping ONE coach for a long time and will be building it with that in mind. (In my case, I do not think that 30 years is unresonable.) The reaction arm system IS on the list for that coach. As that coach will not be driven until fairly complete, the reaction arms can be "further down" the list... but is ahead of a motor and transmission!
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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