Log in

View Full Version : pic: FRC3928 2013 Butterfly Module

Aren_Hill
28-07-2015, 11:08
[cdm-description=photo]42295[/cdm-description]
Dylan179
28-07-2015, 11:09
what kind of hub did you use for the traction wheel?
pmangels17
28-07-2015, 11:44
Since your cylinder mount doesn't pivot, could you go into some detail about how you attach the cylinder to the module?
AdamHeard
28-07-2015, 11:51
Since your cylinder mount doesn't pivot, could you go into some detail about how you attach the cylinder to the module?

It just pushes on a standoff. There is some sideways sliding contact but it's a non-issue.
josesantos
28-07-2015, 12:49
It just pushes on a standoff. There is some sideways sliding contact but it's a non-issue.

If you're having trouble visualizing, you can check out this video of 3847's modules from 2014:

https://www.youtube.com/watch?v=GF_CP-9eMDY (https://www.youtube.com/watch?v=GF_CP-9eMDY)
pmangels17
28-07-2015, 16:54
Ah, that does seem like the simplest solution. Thanks!
Aren_Hill
28-07-2015, 23:16
what kind of hub did you use for the traction wheel?

In this instance the traction wheel was made from a solid piece of 2.5" diameter Delrin, the Pulley was milled into the side, and two 3/8" bearings were pressed into it.
Had access to a CNC mill, decided to minimize the part count and not require ordering a pulley.

-Aren
DampRobot
29-07-2015, 16:14
And now I know where Adam got his 2013 offseason drivetrain design.
kitare102
01-08-2015, 20:54
What would someone look for if they were trying to find an extrusion like you guys used for the main structure of these rails? As well, how are you planning to connect the frame up once both side rails are completed? The pattern of those holes looks like it would be great for designing attachment points.
bstew
03-08-2015, 21:50
As well, how are you planning to connect the frame up once both side rails are completed? The pattern of those holes looks like it would be great for designing attachment points.

As this was our 2013 robot, you can see how the frame was designed to be assembled here (http://www.teamneutrino.org/seasons/ultimate-ascent/robot/chassis/).
Aren_Hill
03-08-2015, 21:58
What would someone look for if they were trying to find an extrusion like you guys used for the main structure of these rails? As well, how are you planning to connect the frame up once both side rails are completed? The pattern of those holes looks like it would be great for designing attachment points.

Also for reference this is 3"x3" x .125" wall Aluminum tubing, nothing special.
Online metals has it (http://www.onlinemetals.com/merchant.cfm?pid=18020&step=4&showunits=inches&id=1270&top_cat=60) but a local supplier will give a better price.

-Aren