pic: Omniwheel Minibot

[Scott Kozutsky]

Originally Posted by AdamHeard

Make sure the lipos you get can handle the potentially huge currents 2 CIMs would cause. Trying to draw too much from them can cause thermal runaway and fire.

In terms of size and weight, I think you'd get a more satisfying performance by switching to 550's or 775 sized motors as you can shave a lot of size and weight off, without a large power loss.

The reason I chose to go with CIMs is because it's actually cheaper and simpler than using those more sensible motors. The Cim motor isn't much more expensive than a 775 for instance but because of the lower speed and higher torque we don't need any additional stages and we don't need to buy either non-vex gears or versaplanetaries. Also, because it's so light I doubt we'll see the massive stall currents that CIMs are capable of.

I'm actually planning a WCD styled minibot that uses 500 series brushless motors (made out of 30mmx15mmx1.5mm alu extrusion, I need to practice my metric) so it will also fit the RS 550.

[mman1506]

Originally Posted by AdamHeard

In terms of size and weight, I think you'd get a more satisfying performance by switching to 550's or 775 sized motors as you can shave a lot of size and weight off, without a large power loss.

Additionally you have to look at its intended use. We regularly do demos for 6 hours without cool downs. The additional thermal mass will prevent over heating the motors.

[ekapalka]

I see you've got the rendering pretty well figured out. Could you share a bit about how it was done? It looks photorealistic :)

[mman1506]

Originally Posted by ekapalka

I see you've got the rendering pretty well figured out. Could you share a bit about how it was done? It looks photorealistic

I'm no expert but it was done in Solidworks photoview. Make sure perspective is on. I also added a spotlight to make things look a little more realistic.

[Orion.DeYoe]

Originally Posted by Alan Anderson

That looks like a very clean design. Well done.

But I can't understand the reason for using identically-oriented omniwheels in all four corners. Won't that let the 'bot slide sideways uncontrollably?

Controllability is relative. If you want to slide sideways then it does exactly what it's supposed to. Have you not seen 33's drive train (inspired by the JVN Build Blitz team I'm sure)?