Do it Yourself: Re: [DIY] Lift Assist Hinges

Post a pic of what you are trying to lift so we all can see the mechanics please...

I believe I am exactly correct.....torque is the product of the
lever arm length and the force necessary to produce rotation..or in your\
case, the lift force necessary to rotate the lifted item aroujdf the hinge axis.
(these are vectors..have length, angle, etc etc)

so therefore, the further away from the rotation point (your hinges) the force is applied
the less force is needed to produce the torque necessary to rotate (lift) your item.

____________________

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On Tue, 10/27/15, Bob Davis bob@wrobertdavis.com [DoIt_Yourself] <DoIt_Yourself@yahoogroups.com> wrote:

Subject: Re: [DIY] Lift Assist Hinges
To: "DIY" <DoIt_Yourself@yahoogroups.com>
Date: Tuesday, October 27, 2015, 5:56 PM

With all due respect, this just doesn't make
sense. Force and torque are not the same thing.
Pounds/sq inch has no relevance. Can you give a link to
an example for what your are describing that shows a
formula? The formula you quoted is not one I am familiar
with. What is the "width" term? Why is it divided by
2? Can you post a sketch of picture of what you are trying
to do? I get the feeling your analysis of capacities
needed is not based on a proper model of how to calculate
the forces.
Bob
On Oct 27, 2015, at 3:46 PM,
subprong subprong@gmail.com
[DoIt_Yourself] <DoIt_Yourself@yahoogroups.com>
wrote:
Bob,
I think I'm using the correct term but perhaps not. As
I've been researching these devices, I've seen a
formula given with several products. The formula is to
basically determine how much force or torque your item needs
in order to lift it so that you can compare it to the pound
rating for the hinges. The formula is weight (pounds) x
(TIMES) width (inches) (front to back) / (DIVIDED BY) 2 .
What I need is between 1000-2000. The highest I've
seen in-store is about 100 per hinge.

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