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Pneumatic or Hydraulic?

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Denny Graham Gold Member Dennis Graham
Sandwich, IL, USA   USA
1950 Chevrolet 3600 "Old Blue"
1954 Chevrolet 3600
The absolute simplest foot operated throttle hookup is a straight single strand
throttle/choke cable Rick. The problem I have with that is.....it's simple and I
have to complicate damn near everything I do. But.....to opperate smoothly
the cable housing needs to make sweeping bends and straight sections,
the straighter the better. That's normally not a problem but sometimes get
in the way and doesn't look all that neat.
A hydraulic link can run just about anywhere you want it to run, around
sharp corners and such. But.....it to needs to be a simple set up or it's
simply not worth the trouble it. and the simplest circuit is one single line
running between the master and slave.
The matter of stiction can be over come, just a Chuck posted, it's the
exact same solution that I was thinking of trying. And once again, it
might not end up being a problem at all if the anti-stiction oils work
as advertised.
A hydraulic throttle is simply an experiment, something that I've wanted
to try on my own for a few years now.
Denny Graham
Sandwich, IL

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littletex Avatar
littletex Blake Martindale
Azle, TX, USA   USA
Little Tex Here,
I used to have an old Buick Riviera and it had a vacuum operated trunk release in the glove box that pulled on the latch belcrank to release the trunk and a strong return spring to reset it. I know the the vacuum hose had to make a lot of crazy turns and runs to go from the glove box to the trunk so would something along those lines work? just an idea thanks.

Denny Graham Gold Member Dennis Graham
Sandwich, IL, USA   USA
1950 Chevrolet 3600 "Old Blue"
1954 Chevrolet 3600
Not hardly Blake. That would be under the heading of pneumatics, air is compressible so
a pneumatic system would act like a rubber band in a control circuit.
Pneumatics are good for actuating a lock or switch, something designed to
be either on of off. but not for a control circuit which requiresa ridged link for
fine control.
dg

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CaptJimmO Avatar
CaptJimmO Gold Member James J O'Donnell
Abbotsford, BC, Canada   CAN
1972 BMC Racecar "BUGSPRY"
2001 CycleKart Lightweight "Dag"
2006 Other Custom "BandAid Car"
Denny, I have made hydraulic cylinders for low pressure operation and used push on air fittings, check SMC Pneumatics. To get the return response, I put a spring inside the single operating cylinder that would return the oil back to the master cylinder. Its was closed loop, one hose, 6mm. I used light machine oil and it worked just fine. You may have to fine tune the spring . . . . .


JimmO



"just another colourful stitch in the rich tapestry of life"

CK Skunk Werks, Mission BC

Denny Graham Gold Member Dennis Graham
Sandwich, IL, USA   USA
1950 Chevrolet 3600 "Old Blue"
1954 Chevrolet 3600
That's just what I had in mind Captain Jim. Besides the use of these in
construction equipment, I've learned that they're used a lot in luxury
marine equipment.
I've got some 4 and 6mm fittings coming and had to buy a 50' roll of tubing.
4mm is all I've found so far, been looking for some 6mm, I'll probably
pick some up at Motion Industries which is a few towns over.
I hadn't thought of putting a spring in one of the cylinders, thanks for that
idea, and I'll use that. I do remember seeing spring loaded pneumatic cylinders
when I was working at the Accelerator Lab.
One of my concerns is bleeding the system. I may put a tee in the line with a small
needle valve to bleed the system.
Looks like I'm going to have to give it a try. But just in case it doesn't work out.....I've
also got a cable ordered.
Thanks for the input.
Denny Graham
Sandwich, IL

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