[FTC]: Drive Platform- Design Exercise

[DavisDad]

[DavisDad]

Modern Robotics Inc. has posted CAD files for the new controls modules here:Download Files


Core Modules STEP files
Core Device Interface PDF
Core Device Interface 3D PDF
Core Legacy Module PDF
Core Legacy Module 3D PDF
Core Motor Controller PDF
Core Motor Controller 3D PDF
Core Power Distribution Module PDF
Core Power Distribution Module 3D PDF
Core Servo Controller PDF
Core Servo Controller 3D PDF

[DavisDad]

Made the coupling:

[JohnMMcD]

Originally Posted by DavisDad

Modern Robotics Inc. has posted CAD files for the new controls modules here:Download Files

...

Thanks for posting this, Craig. To anybody else who is interested in downloading these, just grab the STEP files - this zip file includes all the PDFs.

The PDFs are a little disappointing - they don't include an orthographic projection or dimensions.

[DavisDad]

Hi John,

Yes, the PDFs don't help much. Have you worked with CAD solid modelling software? I recommend checking out OnShape. It's free and requires no software installation or difficult IT maintenance. Projects at OnShape can be "public" and anyone can view & copy. The MRI files have been imported to OnShape and are available for anyone to use.

Craig

[JohnMMcD]

Yes, I took a look at OnShape based on your previous posts. It looks interesting, but my CAD skills are quite rusty, so I can't give it a fair evaluation. I'm going to show it to my team's CAD person to see if he's interested.

[DavisDad]

Completed the basics of the platform design. Trying to maximize the open space inside the 18in square limit. Additional structure, particularly front, will be designed as determined by the game functions. If the open space is not required, a simpler straight drive design could be used. We built and competed with the straight drive and had no failures other than a broken mecanum roller from dropping during transport.

[DavisDad]

Oh well, the mecanum design is pretty much worthless for this year's game; back to the drawing board. I'm thinking BIG tires:

[Gdeaver]

A 30 degree slope is bad. Sixty is quite a problem.

[DavisDad]

Originally Posted by Gdeaver

A 30 degree slope is bad. Sixty is quite a problem.

I get 30 & 50 deg from CAD model. Yes, keeping the COG low enough to climb the 50 deg bars will be a challenge.

[MattRain]

I get 30 & 50 deg from CAD model. Yes, keeping the COG low enough to climb the 50 deg bars will be a challenge.

I don't have the exact measurements, and not currently in the room, but I would agree that the angles are around 30 and 50 degrees.

Who said you had to "climb" the 50 degree section.... (I see the more advance bots just dragging themselves past that section in the endgame, I.e. starting from the low zone, and reaching to the bar.) (During the regular 2 minute time period, just driving to the low zone, and extending to the high goal as well, over the churros)

[DavisDad]

Originally Posted by MattRain

...over the churros)

Where's the term churro come from?

[Michael Coleman]

Originally Posted by DavisDad

Where's the term churro come from?

They look like the churro fried-dough pastry: https://en.wikipedia.org/wiki/Churro.

[MattRain]

Originally Posted by DavisDad

Where's the term churro come from?

FRC came up with the term for them. I think it was an intern at Andymark actually. Well known little product, used mainly in the Kit of Parts drive train for FRC.

[wgardner]

Originally Posted by Michael Coleman

They look like the churro fried-dough pastry: https://en.wikipedia.org/wiki/Churro.

Yeah, that. Must be a regional thing.

I lived for a long time in San Diego and I understood the reference immediately as my kids grew up eating them with their Mexican food kids meals.
http://www.rubios.com/menu/other-fare-and-kids/churro/