Re: Introducing Revolution Pro...crab/swerve module
 

Good observations. The image on the main page is of the original prototype. It had a 1/2" hex input on the vertical drive shaft. The production version sticks with the 3/8" keyed shaft.

The images of the complete robot are really just for reference. We just finished building it...it used a classic module. The new modules aren't quite ready.

I will post some step files soon.

Many posters in this thread have addressed your statements. Unfortunately I haven't seen your designs. I'm sure they are similar in many ways...as are most swerve derivations...but this is definitely a coincidence.

As for the platform design, I did my first one in 2010. I slowly modified and improved the design over the years. You can see our custom creations here.

http://www.team221.com/order.php?cat=10

Re: Introducing Revolution Pro...crab/swerve module
 

You pointed out that your designs were disturbingly similar, implying that the Revolution swerve module had somehow copied yours.

Excluding 2009, show me a swerve drive that does not use a wheel with a tread. Teams have been using small wheels since 2008 (http://www.chiefdelphi.com/forums/sh...ad.php?t=64824)

Here's a team using a 3" wheel: http://www.chiefdelphi.com/media/photos/38289

See 148 in 2008. The wheel is off center in that design.

See 148 again.
Or this one: http://www.chiefdelphi.com/media/photos/37005

See this design: http://www.chiefdelphi.com/media/photos/34443
Or any 118 robot since 2005.

See the old revolution swerve design.
Also, this drawing shows that their wheel axle isn't hollow. (http://www.team221.com/upload/445-Revolution_Pro.pdf)

221 Robotic Systems has used this frame before you have.
Where else would you put the steering motor?
118 has done this in 2007.

Excluding this and Aren Hill's in wheel CIM swerve, most swerve designs are very similar, or fall into a few categories.

Re: Introducing Revolution Pro...crab/swerve module
 

I'm sorry, that's not what I was trying to imply.
I'll quit posting in this thread now, sense it seems like I'm just making it worse.

Re: Introducing Revolution Pro...crab/swerve module
 

Alright guys, give him a break. I think he gets the point.

Andrew, I'm loving the updated design! Seems very efficient and compact. If I'm ever on a team considering swerve again it'd definitely be the top candidate. The updates have really modernized the design, and I really like that it shows off what you can do with mostly COTS parts.

Re: Introducing Revolution Pro...crab/swerve module
 

Agreed with both points -most swerves are quite similar anyway.

I really like this design. It's just simpler and smaller.

Re: Introducing Revolution Pro...crab/swerve module
 

Nice, we used the Revolution modules for our swerve this year.
I see that you ditched the chain connecting the wheel to the top part thingy. I like that; we have had a bit of problems with the chain coming off.

Re: Introducing Revolution Pro...crab/swerve module
 

Entertainingly enough, I sent a concept to Kevin back in April of this layout, he just made a 2 speed version and posted it first. :rolleyes:

I'll post mine sometime in the near future.

-Aren

Re: Introducing Revolution Pro...crab/swerve module
 

STEP files are now posted.

http://www.team221.com/viewproduct.php?id=147

Re: Introducing Revolution Pro...crab/swerve module
 

Thank you so much for this, I took a cross section and noticed there is a 1/2"id bearing right above the vertical bevel gear that doesn't seem to be doing anything. If it were 3/8 it would be guiding the shaft which would make sense, am I missing something? I also noticed there are no thrust bearings anywere, only thrust bushings, I guess you have found this to be acceptable?

Also, in the prototype with the hex shaft sticking out the top how did you manage to assemble that without using larger diameter hex bearings and thus a larger overall diameter?

Re: Introducing Revolution Pro...crab/swerve module
 

Looks like a modeling typo. It's the same 3/8" ID bearing shown at the top of the stack. Thrust bushings are the answer. We used them on the classic Revolution and they performed great. Actually a lot of swerve guys think you can send the thrust loads directly into the ID of the bearing....I like the additional overhead that the bushing provides.

The shaft was 1/2" hex to 1/2" round to 3/8" hex. It used a 1/2" ID x 7/8" OD bearing....the same one incorrectly shown in the model actually. Vexpro sells them. We changed back to the keyed shaft as the original design was cost prohibitive.

I've updated the model with the correct bearing.

Re: Introducing Revolution Pro...crab/swerve module
 

The fact that a shaft like that was actually created makes me smile, I never even considered that lol

Re: Introducing Revolution Pro...crab/swerve module
 

You'd love every one of the shafts on our 2012 robot then.

Re: Introducing Revolution Pro...crab/swerve module
 

I really need to look at your CAD more

*finds 2012 drive*

I...wow, that drive...all questions, no answers...

https://imgur.com/qubH6NJ

Re: Introducing Revolution Pro...crab/swerve module
 

I don't think our 2012 ever got posted, but I should get on that.

What you linked is one of our WCD drive shafts. Fun part. We generally have a sponsor make them, but we've had students make them (and similarly complex parts) in house on our manuals.