Storks bill measurements need

[RaulAlonso]

Hello, I'm wanting to build a graduated storks bill. I would like them to collapse completely, and maybe extend three or four feet. I would like the smallest 'diamond' to be about 4 or 5 inches and increasing about two or three inches every diamond. Does anyone have a formula or plans I can follow? Thank you all in advance.

[m2x]

What is a storks bill? Do you mean lazy tongs? From your description sounds like lazy tongs except with differing sizes of each one.

I made some 3d printed lazy tongs about a month ago that worked pretty well. They aren't very strong through. I could post the stl files if anyone wants.

[m2x]

Did you ever find the information you needed?

I saw this youtube video today and it reminded me of this thread. The author of that video also posted a link to the files so you can 3d print your own at https://www.thingiverse.com/thing:1902131

[ME]

First diamond with a side A=4 inch from pivot to pivot.
Next diamond with a side B=A·n
When it's 2 inch bigger then n=B/A = 6/4 = 1.5

First bar from pivot to pivot: A+B = A·(n+1) = 10 inch
Add the width of this bar (W) to get the center of the outer pivots at least ½W from the outer edges.
Length.bar1 = A·(n+1)+W, with the center pivot at ½W+A

Next diamond with side C = B·n = A·n²
Length.bar2 = B·(n+1)+W, center pivot at ½W+B

Third diamond with side D = C·n = A·n³
etc.

It goes well for the first few and then the rational numbers get more decimals:
Without the added width, the length sequence becomes: 10, 15, 22.5, 33.75, 50.625 ...

For a better match, make n=1.618 (Phi) and start with a Fibonacci number: 34 for example.

MT138 has n≈1.21

[agor95]

It just a 'why not'

Following your point 8, 13, 21, 34, 55. Five diamonds with the last units is '55'.

Just multiply with the unit proportion to convert to cm of inches.

Cheers

[silent]

When you build graduated storks bills, you soon find why they won't work very well and don't have a good range of motion. I had no idea about this until I built a set. I highly advise you to go ahead and build a cardboard model with brads for the pivot points so you can see what I'm talking about before you devote time to building them out of a more substantial substance.

My opinion 100%

silent

[agor95]

Hi silent

That is good advice.

However what about using them by pulling them at each end.

This means not using them as levers.

Regards

[Sam Peppiatt]

RaulAonso;
For a tapered storks bill, it's very simple. Start with a four inch diamond. Then just make each subsequent stage / diamond one inch longer then the one before. Each leg of the "X" gets 1/2 inch longer, to increase the length of the diamond by one inch. Five stages will stretch from 5 inches to 32 inches. Six stages will be even more.

I used 1/8 X 1/2 inch strap iron with rivets. Take care to de bur and smooth all holes. There efficiency is quite low----------------------------------Sam

[agor95]

Hi Sam

I was thinking about a lighter plastic version for a table top device.

The idea is to place a lengths of a rubber/elastic band along the centre line.

Each diamond will have a different full open length.
Also the rubber band length can be selected to start to resist at different time.

The Storks Bill will function as a concertina. So it will resist being pulled open.

This compound resistance as it's uses.

Note the Stork Bill can fully close without resistance; you would expect from a spring.

Regards

[Sam Peppiatt]

argor95;
I think plastic would be a disaster! Just use lighter metal-------------Sam

[agor95]

Hi Sam

You are quite correct. I am only thinking of a light table top implementation.

This would be a 3d printer component compatible device.

You see a web site presentation and 3d printer files will allow replication
by more that just a few or the one.

Cheers