On Wed, 1 Feb 2006 10:26:24 +0100, (Nick Müller)
wrote:
Tom wrote:

LOl. What you're saying then, is that 1 x one ton jack will lift
as much as 2 x 1 ton jacks? Interesting hydraulic philosophy, I
wonder what Bramah would say.

I didn't say this. If the jacks work in parallel, they lift 2 tons. But
if you stack two jacks, will they lift 2 tons?

hint: The answer is "no"

Yes, in the case of lifting a car two stacked one-ton jacks would be
limited to one ton. When you start pumping the jack on the top and
reach the one ton pressure limit, even if you jimmy the relief on the
upper jack the relief valve on the bottom jack would open to avoid
overloading.

But NOT when you're talking about a brake caliper, that's not the
right way to look at it - The object of the pressure would be BETWEEN
the two stacked jacks, and it WILL see two tons of pressure - one ton
from each side. They are in parallel, but the forces are opposing.


RIGID SURFACE
|
Jack
|
Pad
--------
Rotor - Measure Force Here
--------
Pad
|
Jack
|
RIGID SURFACE

Know what I mean, Vern?

-- Bruce --
--
Bruce L. Bergman, Woodland Hills (Los Angeles) CA - Desktop
Electrician for Westend Electric - CA726700
5737 Kanan Rd. #359, Agoura CA 91301 (818) 889-9545
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