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Search took 0.00 seconds. Search: Posts Made By: JackandJanet

Forum: Hydraulic lift system

05-21-2012, 04:25 PM

Replies: 19

Part II, Forces

Views: 5,066

Posted By JackandJanet

Steve - you should be able to lift the top...

Steve - you should be able to lift the top manually with four "farm jacks". You can buy these at Harbor Freight, among other places, but they will probably be cheapest there. Here's a link to ones...

Forum: Hydraulic lift system

08-24-2010, 03:06 PM

Replies: 19

Part II, Forces

Views: 5,066

Posted By JackandJanet

In my opinion, there's no shame in being wrong -...

In my opinion, there's no shame in being wrong - I just hate it when I'm reminded that I'm stupid! (And, I really felt stupid after my first post here.)

Your post here is very good, because we...

Forum: Hydraulic lift system

08-24-2010, 10:58 AM

Replies: 19

Part II, Forces

Views: 5,066

Posted By JackandJanet

Sorry Jim, it doesn't work that way. Drawing #3...

Sorry Jim, it doesn't work that way. Drawing #3 is exactly the same as #2. You have to exert a 300# force on the pull rope (by the anchor on the floor, or by hand), to suspend the 300# weight on the...

Forum: Hydraulic lift system

08-23-2010, 03:38 PM

Replies: 19

Part II, Forces

Views: 5,066

Posted By JackandJanet

Jim, another way to think of it (that finally...

Jim, another way to think of it (that finally occurred to what is left of my rapidly fading brain cells) is: Suppose you lift the 300# weight off a floor using the single pulley as described. Now,...

Forum: Hydraulic lift system

08-23-2010, 11:56 AM

Replies: 19

Part II, Forces

Views: 5,066

Posted By JackandJanet

You're right, now that I think about it Ed. :o...

You're right, now that I think about it Ed. :o The part that is confusing is that if you attach the "pulldown" cable to the 300# load, the force at the pulley is instantly cut in half! It's...

Forum: Hydraulic lift system

08-22-2010, 07:45 PM

Replies: 19

Part II, Forces

Views: 5,066

Posted By JackandJanet

Agreed, Jim. The pulley is not bearing a double...

Agreed, Jim. The pulley is not bearing a double load. On a single pulley, you lift 300# with a 300# pull, and the pulley support cannot see more than that 300#.
(Think what it sees if the pulley is...

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