Quote:
Originally Posted by Aren_Hill
i've got an interesting predicament. I've been redesigning and improving our swerve drive from last year, and i've decided to leave dewalts behind and move on to something with nicer ratios. But the problem is the odd constraints on the transmissions size and placement.
A. The output shaft needs to be vertical
B. It would need to accommodate 2 small cims and maybe a big one also
C. It needs to be as short as possible meaning from the back of the motors to the outer plate of the transmission, hopefully around 6 inches in total length, I forget the length of a cim but the shorter the better
D. 3 or more speeds capable of being shifted without pneumatics, servo's or one of the small motors in the kit will be used. preferably servo's
E. customizable ratios.
Any advice?
|
Woah. Those are some crazy tight constraints, but it can be done... What size frame members are you mounting the swerve module to? If it's a 2 incher, I bet I can design a 2 speed gearbox that could meet your needs... Wanna have a CAD swap? Crab for gearbox?
Anyway, on to some suggestions...
A. Easy, just work on how you mount the box.
B. Ew, big CIM. It's a great motor, but keep this in mind: Those motors were from a discontinued product. If you can't find them anywhere, they're too heavy, and many FIRSTers complained about them, what's the likelihood of seeing them in the Kit again? Just saying...
C. Interesting. If you want the motors to face mount, it's fairly easy. If you want the length of a CIM to be the entire size, then you've got a fun challenge to make.
D. I'm not digging this 3 speed thing... a 4 speed is actually easier than a 3 speed, and both are totally unnecessary. If you're having turning issues with your steer setup, you should probably thin out your wheels. What tread are you all using for your bot?
E. No sweat. Also, planetaries aren't customizable... So you should try and stay away from them. They're also heavily expensive. IMO, not worth the cost.
Edit: Not to sound harsh to others, but seriously... Comments in a thread should be helpful to the question asked. Suggesting something that changes his entire design (such as a non co-ax) aren't helpful or relevant. It's like the old saying "If you don't have something nice to say, don't say anything," but instead "if you don't have anything relevant to say, don't say anything at all!" Sorry if I came off as harsh, but taking the topic away from where it's going doesn't help that much...