[HELP] Ramp Arm Crank

[Alasdair Ryan]

Hi guys, I am looking for some ideas on making a arm that will allow a truck ramp to up and down,the real problem is that it needs to work of a crank arm and there is not much space to work in.

I did manage to get some movement but not all that I require.

You need to join on to the black crank and link it to the actuator bracket

Any help will be much appreciated.

ramp.lxf

[Mark275]

Do you have a picture which shows how it should look?

[Alasdair Ryan]

Do you have a picture which shows how it should look?

I don't have a finished picture,you are free to do as you like as long as uses the crank in the picture which links to the LA bracket.

[Mark275]

I mean from a real version

[Alasdair Ryan]

It's the first small section.

[Mark275]

Something like this?

If you turn the lowest gear they all turn and it folds out. (the fancy colours are for clarity )

[Edwin Korstanje]

Best Alasdair Ryan,

Here is some design of Ralph S.

Maybe it´s help you further.

[Alasdair Ryan]

It is the ramps at the back I need help with not the crane.

Something like this?

If you turn the lowest gear they all turn and it folds out. (the fancy colours are for clarity )

I will try that, but it would of been better with some sort of arm linkage,thanks.

[Edwin Korstanje]

Sorry i did not read your post right .

[Mark275]

I will try that, but it would of been better with some sort of arm linkage,thanks.

Aha Let me think some more ;)

[Bzroom]

Here's my version of the mechanism Mark was describing:

[Alasdair Ryan]

Here's my version of the mechanism Mark was describing:

I don't think your design is going to work that well,again some sort of linkage is the ideal solution.

But thanks anyway.

[Bzroom]

I built one and it works pretty awesome, fun to play with. Try it out, you might be surprised. The only down side is that the gears are kind of large and out of scale, but some 8tooths should work just the same, as long as there is an even number.

[hknssn]

I made a basic prototype for the dubble folded truck ramp, see the video below.

Not sure if it fit into your build but atleast its one way to do it :)

[Alasdair Ryan]

I built one and it works pretty awesome, fun to play with. Try it out, you might be surprised. The only down side is that the gears are kind of large and out of scale, but some 8tooths should work just the same, as long as there is an even number.

I will try that idea later.

I made a basic prototype for the dubble folded truck ramp, see the video below.

Not sure if it fit into your build but atleast its one way to do it :)

Well that is what I had wanted but I ran out off room,so now I am looking for alternatives.

Edited August 3, 2014 by Alasdair Ryan

[Alasdair Ryan]

I have came up with a linkage myself that uses a rubber band which works well,but if any off you do have a solution to my problem then feel free to share.

[Mark275]

Great! I had an idea but didnt had the time to buils and test it. Would you show us where you came up with?

[Alasdair Ryan]

Great! I had an idea but didnt had the time to buils and test it. Would you show us where you came up with?

You will see it when I post my moc.