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Unread 01-11-2018, 09:05 AM
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Re: FRC 95 2018 Build Thread

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Originally Posted by BrendanB View Post
Looks good. I assumes this means no drop center? Have you guys played around with that at all? From experience 3467 ran into issues with this after our chassis was machined.
Thanks! You are correct, no drop. We used a flat 6wd last year and absolutely loved it, even geared for 17ft/s single-speed with 6 CIMs. We used Colson wheels, which have a nice rounded edges. I imagine using a flat 6WD with a wheel that has a sharp corner or flange, like a plaction or hi-grip, the edge might dig in and make turning awful.

Credit where it is due: 125 used a flat 6WD in 2014, which gave us confidence to try it, and the FRC Design Calculator Rev 0 was used to calculate turning FoS ahead of testing to make sure that we were not asking for the impossible.
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Unread 01-11-2018, 09:16 AM
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Re: FRC 95 2018 Build Thread

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Originally Posted by JamesCH95 View Post
Thanks! You are correct, no drop. We used a flat 6wd last year and absolutely loved it, even geared for 17ft/s single-speed with 6 CIMs. We used Colson wheels, which have a nice rounded edges. I imagine using a flat 6WD with a wheel that has a sharp corner or flange, like a plaction or hi-grip, the edge might dig in and make turning awful.

Credit where it is due: 125 used a flat 6WD in 2014, which gave us confidence to try it, and the FRC Design Calculator Rev 0 was used to calculate turning FoS ahead of testing to make sure that we were not asking for the impossible.
Nice that it worked for you guys. We drew inspiration from the same place that year (125 in 2014), but ended up shaving down our outer Colsons 1/16th.
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Unread 01-11-2018, 09:21 AM
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Re: FRC 95 2018 Build Thread

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Originally Posted by BrendanB View Post
Nice that it worked for you guys. We drew inspiration from the same place that year (125 in 2014), but ended up shaving down our outer Colsons 1/16th.
At least that was an easy fix!

It's also worth noting that we were well under-weight: 95lbs before bumpers and battery. <120lbs with.
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Unread 01-11-2018, 09:23 AM
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Re: FRC 95 2018 Build Thread

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Originally Posted by BrendanB View Post
Nice that it worked for you guys. We drew inspiration from the same place that year (125 in 2014), but ended up shaving down our outer Colsons 1/16th.
This is the biggest advantage to using Colsons IMO. "Drop tuning" as we like to call it. Amount of needed drop can vary wildly based on wheelbase foot print & CG, so having the ability to do that quickly after the robot is all together is a huge benefit.

-Brando
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Unread 01-12-2018, 10:12 AM
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Re: FRC 95 2018 Build Thread

We're expecting chassis parts to be complete by this Tuesday, much earlier than anticipated.

Prototyping of power cube intakes has yielded interesting results, and we're going to pursue a design that we haven't seen in any of the Ri3D robots. But more on that later.

Our general power cube related CAD is progressing, taking heavy influence from 254 in 2011, our own 2015 robot Lovelace, and 1519 in 2016.
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Unread 01-12-2018, 10:53 AM
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Re: By The Numbers

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...this is the simple math that goes into computing a value quantity from a weighted decision matrix.
The SUMPRODUCT function is an even simpler way of doing this math.
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Unread 01-14-2018, 08:58 AM
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Re: FRC 95 2018 Build Thread

Latest CAD screen shot. The tower is coming together, as is a 4-bar linkage to move our cube collector. Still outstanding is the cube collector geometry, which has been subject to pervasive prototyping; the spool assembly for the lift; and our solution to climbing, which has finally left the concept phase.

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Unread 01-14-2018, 02:09 PM
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Re: FRC 95 2018 Build Thread

How tall is your robot? It was brought to my attention by 3005 to watch for Center of Gravity on the Cable Protectors and the Ramp, and while the height limit is 55 inches, a SCALE with OWNERSHIP is only 48 inches of clearance.
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Unread 01-14-2018, 02:20 PM
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Re: FRC 95 2018 Build Thread

Great looking build. I noticed the Pneumatics on the underside of your robot. We were thinking the same. If those were for CLIMBING from direct contact with the PLATFORM, Q134 of the Q&A was explicit in the clarification for CLIMBING.
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Unread 01-14-2018, 05:05 PM
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Re: FRC 95 2018 Build Thread

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Originally Posted by team5682zs View Post
How tall is your robot? It was brought to my attention by 3005 to watch for Center of Gravity on the Cable Protectors and the Ramp, and while the height limit is 55 inches, a SCALE with OWNERSHIP is only 48 inches of clearance.
Fully closed-down it is 54in. Right now everything is modeled to provide maximum height when extended, but we intend to shorten down the elevator once all components are modeled and we can be sure of our maximum attainable height. We intend to be able to deliver cubes onto a SCALE without OWNERSHIP, perhaps even on top of a first row of cubes.

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Originally Posted by team5682zs View Post
Great looking build. I noticed the Pneumatics on the underside of your robot. We were thinking the same. If those were for CLIMBING from direct contact with the PLATFORM, Q134 of the Q&A was explicit in the clarification for CLIMBING.
Those images are from our pre-season drive base and those air cylinders are used as brakes. They do not lift the robot enough to violate any rules.
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Unread 01-14-2018, 05:23 PM
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Re: FRC 95 2018 Build Thread

This is always one of, if not my favorite, threads of the year. It’s very cool to see some of our design choices echoed. Do you guys intend on climbing? We are attempting to implement a similar POWER CUBE elevator system but have encountered packaging woes with what we’ve referred to as a “buddy climber”. I’m fairly certain we can climb on our own but we’d absolutely love to bring another machine with us.
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Unread 01-14-2018, 05:55 PM
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Re: FRC 95 2018 Build Thread

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Originally Posted by clydefrog88 View Post
This is always one of, if not my favorite, threads of the year. It’s very cool to see some of our design choices echoed. Do you guys intend on climbing? We are attempting to implement a similar POWER CUBE elevator system but have encountered packaging woes with what we’ve referred to as a “buddy climber”. I’m fairly certain we can climb on our own but we’d absolutely love to bring another machine with us.
Thanks! It's always nice to hear that our work is appreciated.

We have a climbing plan that we just conceived of yesterday. It's higher-risk than we normally tackle, so we're going to get the core capabilities of our robot designed first, namely ground-loading CUBES and scoring in all SCALE positions, while leaving the space we think we need open for the climb mechanisms. Then we're planning on designing the climb stuff soon-ish.

We anticipate that a good cube-handler will be competitive at a Week 1 event (our first) and that we'll have time to finalize our climbing mechanisms before our second event in Week 3. Hopefully we get into our Week 5 wait-list event and have time fine-tune everything in competition.
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Unread 01-17-2018, 05:32 AM
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Re: FRC 95 2018 Build Thread

Chassis parts arrived last night!









Progressive Manufacturing does some stellar work!

CAD for the balance of the cube handling and scoring components is complete, at least for the first iteration!

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Unread 01-17-2018, 06:04 AM
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Re: FRC 95 2018 Build Thread

What diameter are those intake wheels? They look quite large!
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Unread 01-17-2018, 06:52 AM
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Re: FRC 95 2018 Build Thread

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What diameter are those intake wheels? They look quite large!
We're starting from ~5in and will wrap a little more material around it. The friction material is TBD.
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