I'm trying to create two arms on either side of a particular machine
that will press against a respective wall, and keep it in place despite
a significant ammount of upward pressure. I assume this means I will
need to use some sort of hydraulic. The actual device needs to fit in
a space no larger then 4"x9"x9", and it needs to work off of a battery.
I don't know anything about hydraulics. Can someone point me in the
right direction? Thanks.

ilpavox wrote:
I'm trying to create two arms on either side of a particular machine
that will press against a respective wall, and keep it in place despite
a significant ammount of upward pressure. I assume this means I will
need to use some sort of hydraulic. The actual device needs to fit in
a space no larger then 4"x9"x9", and it needs to work off of a battery.
I don't know anything about hydraulics. Can someone point me in the
right direction? Thanks.


The smug answer would be to hire a mechanical
engineer.

OTOH, either a camming or scissor mechanism
will generate a sideways force proportional
to the upward force with no external actuators.

W - W
W | W
W | W
W S W
W S S W
W| S S |W
W|S S|W
W| |W
W W
W W


Drawing the camming mechanism in ascii
art is beyond my abilities.

ilpavox wrote:
I'm trying to create two arms on either side of a particular machine
that will press against a respective wall, and keep it in place despite
a significant ammount of upward pressure. I assume this means I will
need to use some sort of hydraulic. The actual device needs to fit in
a space no larger then 4"x9"x9", and it needs to work off of a battery.
I don't know anything about hydraulics. Can someone point me in the
right direction? Thanks.

Sounds like a battlebot project

ilpavox wrote:
I'm trying to create two arms on either side of a particular machine
that will press against a respective wall, and keep it in place despite
a significant ammount of upward pressure. I assume this means I will
need to use some sort of hydraulic. The actual device needs to fit in
a space no larger then 4"x9"x9", and it needs to work off of a battery.
I don't know anything about hydraulics. Can someone point me in the
right direction? Thanks.

Hydraulics has a number of great features but energy efficiency is not
one of them. If you are battery-powered, you'd do better to stick with
electrical actuators. Frex; a way-geared-down permanent magnet motor
turning a lead screw. Many motor manufacturers make such widgets,
alternatively you can easily scavenge them from powered car seats.

--
Fred R
________________
Drop TROU to email.

I have several hospital bed actuators with a remote hand controller I
was about to put on ebay. Contact me offline if you're interested.
-Mike

On Fri, 04 Nov 2005 12:56:42 -0800, with neither quill nor qualm, Jim
Stewart quickly quoth:

ilpavox wrote:
I'm trying to create two arms on either side of a particular machine
that will press against a respective wall, and keep it in place despite
a significant ammount of upward pressure. I assume this means I will
need to use some sort of hydraulic. The actual device needs to fit in
a space no larger then 4"x9"x9", and it needs to work off of a battery.
I don't know anything about hydraulics. Can someone point me in the
right direction? Thanks.

To the OP:
See your library's section on hydraulics and/or millwrighting, Vox.
Audel put out great, thick books on the subjects.

It doesn't appear to -have- to be hydraulic, so in addition, look
for the volumes on mechanical devices and mechanisms such as "1800
Mechanical Movements and Devices", "507 Mechanical Movements" or "970
Mechanical Appliances." They are fascinating to page through as you
see how someone else has solved your problem. Then you can get to work
redesigning it for yourself and your specific need. Is this a class
project, kid?


The smug answer would be to hire a mechanical
engineer.

g


OTOH, either a camming or scissor mechanism
will generate a sideways force proportional
to the upward force with no external actuators.

W - W
W | W
W | W
W S W
W S S W
W| S S |W
W|S S|W
W| |W
W W
W W

Drawing the camming mechanism in ascii
art is beyond my abilities.

Verily. It's also upside down. He wanted to resist -upward- movement.
snicker But your scissor jack could easily work electrically to
solve his problem.


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I looked around a little. How do actuators indicate the max load?

A heavy load actuator seems to be exactly what i'm looking for.
Unfortuntly, these things are not stocked by most warehouses. Is there
a website that stocks more then one brand? Can you guys recommend one
that would be ideal for battery power? Thanks.

On 4 Nov 2005 12:03:23 -0800, "ilpavox" wrote:

I'm trying to create two arms on either side of a particular machine
that will press against a respective wall, and keep it in place despite
a significant ammount of upward pressure. I assume this means I will
need to use some sort of hydraulic. The actual device needs to fit in
a space no larger then 4"x9"x9", and it needs to work off of a battery.
I don't know anything about hydraulics. Can someone point me in the
right direction? Thanks.

www.northerntool.com

Northern tool used to be Northern Hydraulics. They'll have what you
need.