Re: pic: Madtown Robotics Future Frame Proto 1
 

The scale just doesn't look right at all to me..... If the sides are 4x4, those motors look much smaller than small CIMs

Re: pic: Madtown Robotics Future Frame Proto 1
 

i got the drawing for the cims and the gearbox from a team at a regional, it is a dewalt setup.

Re: pic: Madtown Robotics Future Frame Proto 1
 

I'm almost certian those aren't CIMs you're using. Try downloading the CIMs from the FIRST CAD Library and seeing how they compare...

I see you have learned much from Daft Punk :cool:

Re: pic: Madtown Robotics Future Frame Proto 1
 

Hmmm.... I am 100% sure that those aren't CIMs w/ dewalt xrp gearboxes.

I don't know for sure, but I think those might be older drill motors from the KOP a long time ago.

I would go with Hachiban's recommendation and download from firstcadlibrary.

Re: pic: Madtown Robotics Future Frame Proto 1
 

If you're sure i'll do it, do you know of anywhere to get the dewalt gearboxes and the cims and 4 inch double set omni's. That would help me out a lot.

Thanks,
rc

Re: pic: Madtown Robotics Future Frame Proto 1
 

I don't know where to download a model of the dewalt xrp gearbox, but 418 has been posting a lot of screenshots of them; ask them for the model.

As for the cims, go to www.firstcadlibrary.com under the motors section.

For the 4" omni wheels, I don't know anyone who sells them. You may be able to look at the 6" ones on AndyMark.biz and try to design a 4" version that uses the same rollers. Then make a hub to bolt two together.

Re: pic: Madtown Robotics Future Frame Proto 1
 

He's refering to the Kornylak wheels, which are assembled the same way as the larger AM ones.

I've never bothered to make a detailed model of them. No point really... But all the specs can be found here.

Re: pic: Madtown Robotics Future Frame Proto 1
 

I'm with Adam on this. Those are 100% not CIMs, definitely not DeWalts either. They sure look like they could be the old drills, or maybe FPs. Odd mounting method, though it would make sense if you were going for cantilever (which you don't want here).

Re: pic: Madtown Robotics Future Frame Proto 1
 

For the wheels I meant http://www.omniwheel.com/cgi-bin/plu...de=Transwheel4 I'll ask team 418, thanks.

Re: pic: Madtown Robotics Future Frame Proto 1
 

A handful of things:

• The motor, transmission and mount models are from http://www.teamdelta.com/products/prod5.htm
  
  It is not a CIM and it is a different model Dewalt gearbox than the NBD whitepaper calls for, as I recall. I can't say if it'd accept similar modifications and work the same way.
  
• There's no way that tubing deflected several inches under that load. It would surely deform or fail before achieving that sort of deflection.
  
• I designed 4" omniwheels for our 2008 robot that used a combination of custom components and AndyMark products. I'll see what I can do about making drawings of the individual parts. It might be a fun exercise to learn to model things from drawings instead of just expecting that someone will give you a completed model.

Re: pic: Madtown Robotics Future Frame Proto 1
 

Your right, that is a delta gearbox. I thought it was a dewalt with a cim and custom mount.

Solidworks showed an animation with several inches of deflection

I don't have time to draw 4 inch omni's because currently i am the only one that can use solidworks. I have b-ball practice and currently under an internship in which i draw and create signs.

Re: pic: Madtown Robotics Future Frame Proto 1
 

Any FEA visualization software in a CAD package will enormously exaggerate the deflection. Use the colors and scale in the corner of the screen to determine actual deflection; don't eyeball it.

I work full-time with Solidworks and mentor a team, am moving and am tired, so if you're too busy to model the parts, I'm probably too busy to make the drawings. ;)

Re: pic: Madtown Robotics Future Frame Proto 1
 

I am sorry you do that for a living, most people are nice enough to share cad drawings. I know i have. I will use the scale for an exact reading. I posted this frame just to get some suggestions and ways to improve. Thanks for views.

-rc

Re: pic: Madtown Robotics Future Frame Proto 1
 

Forgive me if I misconstrued my meaning. I offered to provide drawings to you of our omniwheels for your reference, but you've indicated that you're too busy to bother rebuilding models from those drawings. If you're too busy to make use of what I offered, then I won't take time from my own busy schedule to make them available.

I offered help and you turned it down. No harm, no foul, as they say, but I'm a bit dumbfounded that, not only was it unappreciated, but that you're saying I'm not nice because I didn't offer more.

Re: pic: Madtown Robotics Future Frame Proto 1
 

My bad, i thought you were telling me make my own with no reference. Sorry, i totally misunderstood. If you could send me those drawings i would greatly appreciate them. rcthekid1323@gmail.com.