Problem upscaling Container mechanism from 8052

[teddybt]

Hi

I tried to upscale the Container mechanism from the Container Truck 8052 to the scale of the Unimog 8110.

I extended the liftarms under the container to from 11 to 15 and made it 2 studs weider to fit 2 LA's.

Looks good but doesn't work... The LA's dont get it over the dead center.

I already tried several positions of the LA's.

Is there a way to get the geometry right? Or do I need another hook lift mechanism to make this work?

Best Regards

Teddybt

[DrJB]

I'm thinking some basic 'linkage' calculation should help you set target target the mechanism's 'mechanical advantage' ... Some sample thinking is like shown below: If the LA's total travel is 4 studs (I'm just throwing random numbers here) ... and the container needs to go back and forth by 32 studs ... then, you'd need a mechanical amplification of 8. That might require too great a force from the LA, and thus you'd need two of them, and possibly a bit more complex mechanism to 'stagger' the mechanicla amplifications .... Makes sense?

[teddybt]

I think I got your point, but I can't implement it.

My "try and error" approch works okay form the way the hook travels/has to travel, but doesn't get it over the dead center.

When I mount the LA's steeper the way is to short

Edited August 30, 2013 by teddybt

[VKTechnic]

Can you maybe post some pictures to illustrate your problem a little better?

[Junpei]

Yes, pics would be helpful, by the way DrJB La's have 5 studs of travel.

[TinkerBrick]

My first thought was that the LAs could be to short and to weak to accomplish the task on the 8110 scale. Maybe a self made LA with gear racks and worm gears would suit this scale better. But they would be at least 3 studs wide.