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Unread 29-12-2015, 14:40
notmattlythgoe's Avatar
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Re: pic: Simple Chain-in-Tube Concept

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Originally Posted by Ty Tremblay View Post
I've made a few updates to this drive train.
  • Switched to 4" wheels after taking another look at the numbers. This should give me actual speeds of 6/14 fps
  • Moved to retaining the wheels with screws and washers to better reflect my team's machining capabilities.
  • Added features for the box tubing to set into on the rails, this will help us make sure everything is aligned before welding.
  • Created an example for a no-welding setup for teams without access to welding. This also allows for all VexPro 3rd stage reductions to be used (box tubing option doesn't allow for 60- and 64-tooth gears).
  • Added basic bumper framing.

Updated model
No welding setup
No welding drive rail
Have you run those bumper rails before?
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Unread 29-12-2015, 15:03
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Re: pic: Simple Chain-in-Tube Concept

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Originally Posted by notmattlythgoe View Post
Have you run those bumper rails before?
I have not. I used the mantra of "copy the best and invent the rest" (thanks Mike Corsetto).

I took inspiration from 118's 2014 CAD as well as 971's one-bumper manufacturing style with reinforced corners.



We plan to do our own testing, but if 118's design lasted the season in Aerial Assault, my initial hunch is that our more conservative design will too.
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Unread 30-12-2015, 05:16
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Re: pic: Simple Chain-in-Tube Concept

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Originally Posted by Ty Tremblay View Post
I have not. I used the mantra of "copy the best and invent the rest" (thanks Mike Corsetto).

I took inspiration from 118's 2014 CAD as well as 971's one-bumper manufacturing style with reinforced corners.



We plan to do our own testing, but if 118's design lasted the season in Aerial Assault, my initial hunch is that our more conservative design will too.
That round tube you see on their drive was actually only to fulfill the rule that there should be no "unsupported" side of the bumper greater than 8" After seeing it at competition it really didn't even support the bumper but it was there only to pass inspection.

I'm not quite sure how they mounted it but my guess is they just tapped the ends of that tube or round stock and bolted it onto those large 2x1 uprights. IIRC the inspectors made them lift their robot by their "Bumper supports" (The round stock in the screenshot) in order for them to pass the inspection proving that "Those actually do support the bumpers". They used those large holes with large threaded bolts attached to the bumpers to mount their bumpers to their robot.

If I were to use what 118 did, I would in fact just use a piece of aluminum rod or even thunderhex shaft that is tapped to do what they did in a similar fashion.
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Unread 30-12-2015, 11:26
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Re: pic: Simple Chain-in-Tube Concept

Quote:
Originally Posted by Cash4587 View Post
That round tube you see on their drive was actually only to fulfill the rule that there should be no "unsupported" side of the bumper greater than 8" After seeing it at competition it really didn't even support the bumper but it was there only to pass inspection.

I'm not quite sure how they mounted it but my guess is they just tapped the ends of that tube or round stock and bolted it onto those large 2x1 uprights. IIRC the inspectors made them lift their robot by their "Bumper supports" (The round stock in the screenshot) in order for them to pass the inspection proving that "Those actually do support the bumpers". They used those large holes with large threaded bolts attached to the bumpers to mount their bumpers to their robot.

If I were to use what 118 did, I would in fact just use a piece of aluminum rod or even thunderhex shaft that is tapped to do what they did in a similar fashion.
Right, but like I said, this is a more conservative approach.
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