LA & Pneumatic lifting in Kg?

[aol000xw]

I remember someone tested pneumatics or LA's or both by making them work against a kitchen scale, but my Google skills failed me.

Can anyone help? I wan't to know how many Kg can I expect to lift with the different LA's and pneumatic cylinders before clutches engage or hoses come out .

[rm8]

May be that was desert752?

[Kelkschiz]

I think I remember that video, its made by Doc's Mocs:

Edited March 24, 2015 by Kelkschiz

[aol000xw]

Did not remember this one, nice to have. The one I am talking about (if it was a video ) was not about springs, there was some Lego structure used if I remember correctly.

At last, found something from TechnicBRICKs

Just missing pneumatics now, I remember it was in the range of 5Kg perhaps at 35 psi?

Edited March 20, 2015 by aol000xw

[Milan]

I did testing with pneumatic cylinders, but removed videos to re-edit them.

Results:

Small Cylinder Test Results

Large Cylinder Test Results

I guarantee that these results are ok, in a few days video will be up and confirm.

Edited March 20, 2015 by Milan

[ben20]

Did not remember this one, nice to have. The one I am talking about (if it was a video ) was not about springs, there was some Lego structure used if I remember correctly.

At last, found something from TechnicBRICKs

Just missing pneumatics now, I remember it was in the range of 5Kg perhaps at 35 psi?

5kg is impossible!

3.2kg max with compressorpump driven by hand, 2.4kg with large handpump (tested myself)

Edited March 20, 2015 by ben20

[aol000xw]

And finally found this https://plus.google.com/photos/112094973674033330754/albums/5192075703083746577?banner=pwa from http://www.techbricks.nl/My-pneumatic-LEGO-projects/pneumaticlegolawsphysicsii.html

Isn't that lever working In favor of the cylinder?

[Bricktrain]

And finally found this https://plus.google....6577?banner=pwa from http://www.techbrick...sphysicsii.html

Isn't that lever working In favor of the cylinder?

it would appear to be

Edited March 21, 2015 by Bricktrain

[vofallbook]

there was some Lego structure used if I remember correctly.

Edited March 21, 2015 by vofallbook

[Milan]

Ok, got videos online:

BIg Pneumatic Cylinder

Small Pneumatic Cylinder

[aol000xw]

Great videos, thank you

[aol000xw]

Does anyone have an approximate idea of how much weight can a small turntable sustain before dislodging?

And in the same line what about those big ball joints?

[Nick Barrett]

Thanks Milan, very helpful videos - I'm surprised the lifting capacity is as high as it is.

[miguev]

Thanks for these tests. Would the lifting capacity increase by adding a second small pump?

[Milan]

Thanks Milan, very helpful videos - I'm surprised the lifting capacity is as high as it is.

Thanks for these tests. Would the lifting capacity increase by adding a second small pump?

No, only the speed of the lifting will increase, pressure would remain the same.

[miguev]

No, only the speed of the lifting will increase, pressure would remain the same.

Thanks! So to increase lifting power I'd need 2 cylinders, and then 2 pumps would achieve the same speed as 1 pump with one cylinder, is that it?

[Milan]

Thanks! So to increase lifting power I'd need 2 cylinders, and then 2 pumps would achieve the same speed as 1 pump with one cylinder, is that it?

Yes. Or use stronger pump (big pump). Using new pumps and cylinders also help.

[miguev]

Thanks! I've been ignoring pneumatics on the assumptions that they are always very expensive and my old ones (80's) were dead, both of which turned out significantly off, so I'm now trying to learn pneumatics from scratch

[Brickthus]

Thanks! I've been ignoring pneumatics on the assumptions that they are always very expensive and my old ones (80's) were dead, both of which turned out significantly off, so I'm now trying to learn pneumatics from scratch

Here's a good place to start. From basics to more advanced stuff, beyond the 8868 truck alternative model!

Mark