Sheet Metal, 8-Wheel Drive Design

[sdcantrell56]

Also that method of braking is OK, and worked decently well with 1477's robot because they used pneumatic tires which had give. Colsons have nowhere near as much give so you will most like not have much braking force at all. Look into a different method for braking, something similar to what 25 has done in years past.

[lynca]

Originally Posted by sdcantrell56

Also that method of braking is OK, and worked decently well with 1477's robot because they used pneumatic tires which had give. Colsons have nowhere near as much give so you will most like not have much braking force at all. Look into a different method for braking, something similar to what 25 has done in years past.

Thanks for the tip, do you have a link or reference design for a brake system from team 25?

[sdcantrell56]

Originally Posted by lynca

Thanks for the tip, do you have a link or reference design for a brake system from team 25?

Search some of their pictures on here. Basically it pushed pins into a hole pattern in a gear to lock the drive

[Madison]

Originally Posted by lynca

Thanks for the tip, do you have a link or reference design for a brake system from team 25?

There's a brief bit about it the Aim High edition of the Behind the Design books if you have that handy. They drove a pin into a gear fairly high up in the gearbox using a servo.

[roystur44]

I like your design and it's simplicity. Don't need a lot of rivet holes in the front and back. Just need the correct amount. Standard 1.5 inch spacing is adequate with the correct size rivet. Since you are cutting the main sheet metal parts you can omit the spacers between the side plates with a series of riveted brackets. I think the brackets are lighter than the round standoffs and provide more surface area to stiffen the frame
You could build in a battery holder to the rear flange. I'm a fan of the staggered round circular lightening pattern. Much easier to manufacture than the diamond pattern. Oh and don't forget the access holes on the side plates to tighten the transmissions to the frame. #25 chain?


I've been trying to get my guys to use the s rail configuration to standardize the mounting of the manipulator but they have been hesitant.
Keep up the good work.

[apalrd]

I attached some pictures from my 'robot archive' of team 25's drivetrain components up close.

I have no idea where these came from. I did not take them, they could be in CD-media, or from somewhere else. I'm not entirely sure any of them are from the same robot.

I hope these illustrate what they are doing a little.

[woodenLogicGate]

We have decided to go with a 6-wheel design for this years design. We were wondering about how much to drop the center wheel. Since we are designing our robot wide instead of long we're only getting about an 18.5 in wheel base. I know that 6-wheel drives usually drop their center wheels 1/16-1/8 ". Considering our wheel base what would be the best choice?

Originally Posted by woodenLogicGate

We have decided to go with a 6-wheel design for this years design. We were wondering about how much to drop the center wheel. Since we are designing our robot wide instead of long we're only getting about an 18.5 in wheel base. I know that 6-wheel drives usually drop their center wheels 1/16-1/8 ". Considering our wheel base what would be the best choice?

I'm hoping by "6 wheel drive wide robot with 18.5" wheelbase" you mean the distance between your front and back wheels are 18.5", with the distance between your center wheels and the outer wheels being 9.25". In every scenario I've seen, 1/8" is the perfect amount for a drop on a 6wd.