pic: Madtown Robotics Future Frame Proto 1

[R.C.]

My bad, too much writing: I meant 150 pounds.

[DarkFlame145]

Personally I dont like the direct connection between the motor and trans to the wheels cause if you get hit hard enough you could bend the drive shaft coming off of the trans. Or am I just seeing it wrong and it's chain/belt driven.

[artdutra04]

You should look for a stronger way to beef up that frame; especially running along the length of the robot. I would suggest making the ribs along the corners of the box extrusion have at least a .625 or .75 lip.

Also, what kind of CNC machine would this be produced on? If it's just a regular milling machine, you'd honestly be staring at the machine for days to machine those side rails. I've seen even simple triangulation patterns take an hour.

A much better solution would be to reduce the number of pockets in half by using larger, triangular-shaped pockets. This would be harder, better, faster, stronger, and a lot easier to machine. (Time is money during the build season).

(Remember, a 150 pound force on a robot frame would be the equivalent of static loading if the robot were to push against a wall. During impacts, the force skyrockets in short bursts, which could easily exceed the 150 or 300 pound load test and bend your frame.)

[sdcantrell56]

Another consideration is that all of your cool designs on the machining will not be visible due to bumper.

If it was me I would simplify the trusses to a triangular pattern to speed up machining and make it stronger.

[R.C.]

It is Chain driven and the machining for this proto will be done over summer as a CNC test and we will make another and i do need to strengthen it up a bit =)

[AdamHeard]

Originally Posted by artdutra04

(Remember, a 150 pound force on a robot frame would be the equivalent of static loading if the robot were to push against a wall. During impacts, the force skyrockets in short bursts, which could easily exceed the 150 or 300 pound load test and bend your frame.)

Very, very true. If you have taken physics you can do some approximations (they won't be very accurate) of the forces involved if two robots impact. Even though inaccurate, you'll be able to see that some very high forces can be applied in impacts.

[R.C.]

Our 2006 robot came back from Nationals and the 80/20 material was all bent up and the bot looked as if it had fallen off a roof top or something

[AdamHeard]

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

[R.C.]

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

[AdamHeard]

Originally Posted by rc_cola1323

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

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.

[EricH]

Originally Posted by AdamHeard

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.

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).

[R.C.]

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

[=Martin=Taylor=]

Originally Posted by rc_cola1323

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

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...

Originally Posted by artdutra04

This would be harder, better, faster, stronger...

I see you have learned much from Daft Punk

[R.C.]

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

[AdamHeard]

Originally Posted by rc_cola1323

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

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.