06-02-2008 15:41

AndyB

Re: pic: Concept Mecanum Drivetrain

Very nice simple design. How thick are your side plates and what are you using to connect both modules (the long black bars). Are they fabricated or COTS?

06-02-2008 16:05

sdcantrell56

Re: pic: Concept Mecanum Drivetrain

Thank you. The side plates are 3/16" thick Al. The connecting bars are 2x1" channel with the ends folded over and welded and then 2 holes are drilled in the ends to mount into the side plates. This is the same method we're using for our drivetrain this year and it seems to work well.

06-02-2008 17:52

T3_1565

Re: pic: Concept Mecanum Drivetrain

that motor setup is exactly how we are using our omnis this year, those gearboxes are really easy to work with lol

06-02-2008 20:19

Alan Anderson

Re: pic: Concept Mecanum Drivetrain

A holonomic drive really wants all wheels to be making contact with the floor at all times. The way you describe the chassis makes it sound very stiff. Try designing it to be flexible, so irregularities or debris on the floor won't give you problems.

06-02-2008 21:50

AndyB

Re: pic: Concept Mecanum Drivetrain

Along with what Alan commented on, I would recommend filleting any of your cutouts you have in your plating. If you don't those will become stress points. With fillets and rounds, you distribute the stress.

06-02-2008 22:42

Rupnick

Re: pic: Concept Mecanum Drivetrain

It may just be the pic but of what I can see your wheels are not in a square which is essential for mec drive. But I may be wrong just looks that way.

06-02-2008 22:44

EricH

Re: pic: Concept Mecanum Drivetrain

Quote:

Originally Posted by Rupnick It may just be the pic but of what I can see your wheels are not in a square which is essential for mec drive. But I may be wrong just looks that way.

06-02-2008 23:00

sdcantrell56

Re: pic: Concept Mecanum Drivetrain

Yeah I thought they would work in a rectangle. I've seen many done that were in a rectangle configuration that worked well. Also as for the flex issue I have seen many teams use mecanum without any suspension and it works. That could always be added in a second revision.

07-02-2008 11:47

bman

Re: pic: Concept Mecanum Drivetrain

So, do you plan on building this for overdrive?!!

07-02-2008 11:56

sdcantrell56

Re: pic: Concept Mecanum Drivetrain

Actually no...We are building a completely custom 6 wheel drive robot. I just got bored and decided to cad up a mecanum.