# What kind of joint is needed?

1. Aug 26, 2014

### HopeFromTexas

We are using a childs wagon as the base for a parade float. The float will be decorated to look like a canoe. We want to attach "waves" to the wheels so that they move up and down as the wheels roll down the road. Similar to this: http://www.skiptomylou.org/2011/07/05/fourth-of-july-float-2011/

What kind of joint would we use?

Thanks in advance for any help.

Last edited: Aug 26, 2014
2. Aug 26, 2014

### etudiant

The example case just has the waves mounted on a frame that is attached to the perimeter of some wheels.
To make the waves move up and down more, use a bigger wheel(s).
Note that the wagon wheels can be quite independent of the 'wave wheels'

3. Sep 15, 2014

### Dnomyar

This might help

#### Attached Files:

• ###### Waves.jpg
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4. Sep 15, 2014

### blainiac

Dnomyar's idea is probably the easiest and most effective for that effect. As it is in the drawing, the point where the wave board is attached to each wheel may cause the board to break, as the distance between each point changes as the wheels rotate (as pictured (top)). If both points were on the same position on the wheel (parallel to the ground), this set up would work. If you added cutout guides that the points could slide to allow the points to move on one dimension, while still giving the desired sine wave vertical motion, that might work (as pictured (see the grey guides)). You could cut out another wave board to 'cover' the attachments and guides.

#### Attached Files:

• ###### cart.png
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5. Sep 16, 2014

### Dnomyar

Try this one - its better :-)

#### Attached Files:

• ###### Waves.jpg
File size:
18.1 KB
Views:
122
6. Sep 16, 2014

### blainiac

Dnomyar hit it right on the nail. (I don't want to hijack this thread, but as a side note, what software did you use to model that Dnomyar?)

7. Sep 16, 2014

### Dnomyar

I find Rhino a great way to "knock up" structure like this. At the end, you can get precise angles and dimensions if you want to build from it.

I can even animate things with the Bongo addon

or

Last edited by a moderator: Sep 25, 2014