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Unread 24-06-2016, 07:46
Ty Tremblay's Avatar
Ty Tremblay Ty Tremblay is offline
Robotics Engineer
FRC #0319 (Big Bad Bob)
Team Role: Mentor
 
Join Date: Feb 2006
Rookie Year: 2004
Location: Alton NH
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Re: pic: Another Belt-In-Tube Drivetrain

Quote:
Originally Posted by kaliken View Post
Could you pocket the tube right above the pulley such that you could pull it out that direction?
This might let you get the pulleys out, but there's so little space around the pulleys in the tube that you wouldn't be able to get the belts off the pulleys before taking the pulleys out of the pockets.

Quote:
Originally Posted by Joey Milia View Post
I think you'll be fine with the 1.5 tube and no flanges, good way to do it. I am more concerned about fitting the 24T pulleys in there, are you sure your belt thickness is correct? When I was choosing 22T for our drives I was pretty sure that was as large as could fit. Maybe i was using a different drop than you or something, but there isn't much room when we assemble, they're almost rubbing the tube on some of our drives.

I don't know when this will be but next time i get access to one of the robots i'll try and take lots of pictures and show how we do assembly and everything. We have it so assembly and disassembly are really really fast.
Excellent, thanks Joey. I'll double check the thickness of the belts in the CAD, do you know of any resources online that will tell me the outside radius of a pulley with belt on it?

Quote:
Originally Posted by DaveL View Post
Hi Ty:
Can you talk about the bumper supports?
(How are they assembled?
Have they been used in the past?)

Dave
These bumper supports are an evolution of a concept I copied from 118 last year. The thread I linked has a more in depth explanation, but the short of it is that single-piece bumper assemblies with reinforced corners are plenty strong enough to withstand the rigors of an FRC season and you don't need much extra structure behind the .75" plywood.

In 2016, 319 ran this bumper support setup, which is all 1"x1"x.0625" tubing, along with a single-piece bumper. We didn't have any issues with bumpers all season despite playing in over 100 matches. One thing we did notice, however, is that putting chain or belt inside your chassis rails puts a lot of limitations on where you can mount things to your chassis. We ended up mounting more than we wanted to the .0625" wall bumper supports in 2016.

For this evolution, I copied 558's concept of a single piece of 1"x2"x.125" for bumper supports on the side, and the chassis rails for bumper supports on the front. This gives us a rigid place to mount things, and means we don't have weight on the robot dedicated solely to holding bumpers. The angled 2"x1" supports were also 558's idea, but I modified ours a bit since 319 has welding capability in-house. If you remove the cutout, you can bolt the bumper rail to the top of the angled piece, and then bold the angled piece to the top of your chassis. I'll get ahold of 558 and see if they can post a few pictures of their setup.
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Last edited by Ty Tremblay : 24-06-2016 at 08:13.
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