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### Author Topic: admin's one part suspension  (Read 2805 times)

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#### pomprocker

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##### admin's one part suspension
« on: July 25, 2008, 03:42:37 PM »
I am interested in obtaining admin's design for the one part suspension system. more specifically the omniwheel caster mounts.

I would need a cad of it or something, and also i assume that the FEA was done using delrin?

what if the shape was cut from a different material? hdpe..aluminum...acrylic...etc...

-thanks

#### Admin

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##### Re: admin's one part suspension
« Reply #1 on: July 25, 2008, 07:06:18 PM »
Well, the design is specific to the weight of the robot, the number of caster wheels you use, and the material used.

If you don't have FEA, the next best way is to guess the design and do some experiments.

There are paper and pencil ways to calculate it, too . . .

online calculator (use cantilever, with end load):
http://www.efunda.com/formulae/solid_mechanics/beams/theory.cfm

and actual equations (use the one at the very top):
http://www.me.metu.edu.tr/me206/SuhaOral/Beam_Deflection_Formulae.pdf

#### pomprocker

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• Sorry miss, I was giving myself an oil-job.
##### Re: admin's one part suspension
« Reply #2 on: July 26, 2008, 01:54:53 AM »
Well I would have one on the front and back.

The weight would be changing though, as I plan to make my robot stackable, maybe only a few levels.

#### swapkul14

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##### Re: admin's one part suspension
« Reply #3 on: December 04, 2008, 01:11:30 AM »
I also want to use the single part suspension system. But I wanted to know more details. How much weight can it support?.. If possible, any more details. And can u please elaborate the procedure of manufacturing it?.. Please reply back soon..

#### Admin

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##### Re: admin's one part suspension
« Reply #4 on: December 04, 2008, 05:59:15 AM »
swapkul14, all the answers are found in my tutorial.

It can support any weight you design it to support. Obviously the design to support 10 pounds will be very different if you wanted it to support 1 pound or 20 pounds. It's not a one size fits all type of design

I used CNC and delrin to produce it, but I recommend using a 3D printing service using ABS plastic. For the more basic shapes you can just do it by hand with a bandsaw.

#### pomprocker

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• Posts: 1,430
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• Sorry miss, I was giving myself an oil-job.
##### Re: admin's one part suspension
« Reply #5 on: December 04, 2008, 03:36:24 PM »
I originally thought from reading that you were going to mass market your Experimental Robot Platform. That being the case, I think it would be good to have a selection of your one-part suspension for different weight ranges since this platform is expandable and the weight will always vary. For example, less than 1 pound, 2lbs, 3-5lbs, 5-7lbs, 7-10lbs, etc. Also make them height adjustable for robots with different ground clearances. I'd buy a set!

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