Is Omni/Holonomic Necessary?

VEX V5 General Discussion General Forum
1

Hello Everybody!

I had a quick question for everyone who reads this. I was wondering whether or not omni/holonomic drives are going to be useful.

I can’t decide whether or not to go with one.

2

You need a drives that is fast and easy to turn. This is an essential for this year IMO

3

no specific design is necessary, most features are a trade-off or personal preference.

4

Our base has dual planetary transmissions. Why? Because we can

In my experience, holonomic drives are a pain to build, but once they are, then they are really useful from a maneuverability point of view

5

Can you tell us more about your planetary transmissions? Size, ratios, can they stack, etc,

6

Outer gear is a HS 60 tooth, inner gear is a HS 36 tooth surrounded by 4 12 tooth HS gears driven by 6 tooth sprockets.

7

But don’t you require extra motors/pneumatics to lock the two motors driving the planetary gear so that you get full torque?

8

It seems to work fine as is…Will have to investigate that

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@Foster Can you tell us more about your planetary transmissions? Size, ratios, can they stack, etc,

@NattyMan0007
Outer gear is a HS 60 tooth, inner gear is a HS 36 tooth surrounded by 4 12 tooth HS gears driven by 6 tooth sprockets.

We spent part of the day talking about this design:

https://vexforum.com/t/planetary-transmission-can-this-really-provide-the-torque-of-2-motors/25710/1

Can you post a picture of your setup?

11

Sure. Sorry about late reply. Timezones

12

Dang, thats a work of art, haha!

13

Above still applies.

14

Thanks

So in order to get torque ratio I must lock the larger gear in place?
It does work, however I don’t think it is a reduction from looking at a wheel placed on the output shaft. But rather just direct drive

15

I don’t know if it only applies to the torque ratio. Because the motors are powering different parts of the planetary gear, one motor will receive more load than the other, and you end up only getting the torque of one motor.

16

Thanks for posting, you made the last mins of our summer camp, 6 teams 20 roboteers. Lots of good ideas and September is looking like lots of fun.

17

Hmm, I will dig up a video of it being driven

No Problem

18

Videos: (note that this is an old prototype)

19

The speed does change, but you should put load on it to test its torque.

20

Yes, My point exactly.