pic: GBX-139, budget swerve

[asid61]

[cdm-description=photo]43760[/cdm-description]

[Colin Small]

Awesome design!

Do you have the drive shaft to the bevel gears going through the module turning gear?

[Conor Ryan]

Any evidence (either way) that the delrin/acetal bevel gears can hold up for a full event?

Also, are you sure you want a 775 as your main drive motor? Your chance of burn out is much higher and you really don't want to take that type of risk. The way the motor is designed makes it a much smarter choice for any application where it won't be stalled for a significant length of time. Although you probably won't stall much in a swerve drive, you will be running close to stall conditions frequently and that will generate a large heat load.

Awesome execution either way.

[AlexanderTheOK]

Any evidence (either way) that the delrin/acetal bevel gears can hold up for a full event?

Also, are you sure you want a 775 as your main drive motor? Your chance of burn out is much higher and you really don't want to take that type of risk. The way the motor is designed makes it a much smarter choice for any application where it won't be stalled for a significant length of time. Although you probably won't stall much in a swerve drive, you will be running close to stall conditions frequently and that will generate a large heat load.

Awesome execution either way.

"It is made for a 70-80lb demo chassis, although it is possible to convert it to a competition design by swapping bevel gears and motors." -asid61

[cad321]

Any evidence (either way) that the delrin/acetal bevel gears can hold up for a full event?

The OP said that this was meant for a demo bot (a light one at that). I don't think the goal is to hold up to full on aerial assault defense.

That's how I saw the module, correct me if I'm mistaken OP. Love the design BTW.

[asid61]

Awesome design!

Do you have the drive shaft to the bevel gears going through the module turning gear?

Yup! This is how 1323 did it last year, and is the lightest way I've found to make a swerve drive.

"It is made for a 70-80lb demo chassis, although it is possible to convert it to a competition design by swapping bevel gears and motors." -asid61

Any evidence (either way) that the delrin/acetal bevel gears can hold up for a full event?

Also, are you sure you want a 775 as your main drive motor? Your chance of burn out is much higher and you really don't want to take that type of risk. The way the motor is designed makes it a much smarter choice for any application where it won't be stalled for a significant length of time. Although you probably won't stall much in a swerve drive, you will be running close to stall conditions frequently and that will generate a large heat load.

Awesome execution either way.

The OP said that this was meant for a demo bot (a light one at that). I don't think the goal is to hold up to full on aerial assault defense.

That's how I saw the module, correct me if I'm mistaken OP. Love the design BTW.

Bingo. Heck no, this won't hold up for a competition. But if a team wants to try swerve programming, this would be my preferred module. By swapping, I meant swapping for steel gears.
A few teams did run 775pros (rip Mittens) this year for drive motors, with varying results. However, as this is made for a lighter demo bot, I'm not worried about a demo bot that won't see defense. If I had to compete, I would convert to a CIM drive for sure.

[Colin Small]

Yup! This is how 1323 did it last year, and is the lightest way I've found to make a swerve module.

How though? If it turns all the way around, what connects the outside teeth to the central part of the gear? Is there a slot cut into only a section of the gear?

[asid61]

How though? If it turns all the way around, what connects the outside teeth to the central part of the gear? Is there a slot cut into only a section of the gear?

The drive motor has a 12t pinion that is coaxial with the turning gear. When the module turns, the center-center distance between this gear and the offset one remains constant like a point going around a circle. Have you taken a look at the CAD yet? I'm not sure I answered your question right.