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  #16   Spotlight this post!  
Unread 01-02-2017, 14:50
fresh_prince fresh_prince is offline
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Re: pic: Spectrum 3847 - 2017 CAD Model: Gamma Ray

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Originally Posted by lukekaiser View Post
Very nice. What is the upper appendage intended for?
The roller with the mecanum wheel is our full-width fuel intake.
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Unread 01-02-2017, 14:52
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Re: pic: Spectrum 3847 - 2017 CAD Model: Gamma Ray

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Originally Posted by fresh_prince View Post
The roller with the Vectored Intake wheels is our full-width fuel intake.
Vectored intake wheels are the best.
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Unread 01-02-2017, 14:55
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Re: pic: Spectrum 3847 - 2017 CAD Model: Gamma Ray

Great looking robot there! Awesome cad work as always.
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Unread 01-02-2017, 14:56
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Re: pic: Spectrum 3847 - 2017 CAD Model: Gamma Ray

Quote:
Originally Posted by Michael Corsetto View Post
Allen,

Really cool bot, love what your team is doing with the open build/blog. Seems like a great learning experience for your team.

Whats the process for scoring the gear once in the gear holder?

Great work as always,

-Mike
In our testing it hasn't been difficult to deliver the gear out of the intake by just reversing the roller, lowering the arm, and driving backwards once the spring has pierced the gear. We were hoping for a cleaner release but couldn't get the gemotry of our first system to a point we thought it would be robust enough for the whole season. We haven't tested this geometry on a rolling chassis yet and that will be one of the first things we do when parts come in next week.

I'd assume we will be iterating on the drop off portion all season to make it as fast as possible without compromising it's pickup speed and ability to securely hold the gear during high speed collisions.
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Unread 01-02-2017, 14:57
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Re: pic: Spectrum 3847 - 2017 CAD Model: Gamma Ray

Quote:
Originally Posted by RoboChair View Post
Vectored intake wheels are the best.
So if "vectored intake wheels" are now a thing, does that mean we can add mecanum to the list of misspellings of mecanum-err-vectored intake wheels?
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Unread 01-02-2017, 14:59
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Re: pic: Spectrum 3847 - 2017 CAD Model: Gamma Ray

What is your shooter drum made out of?

This is awesome, just wish my computer would load the step file so I could get into the model more.
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Unread 01-02-2017, 15:09
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Re: pic: Spectrum 3847 - 2017 CAD Model: Gamma Ray

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Originally Posted by EricLeifermann View Post
What is your shooter drum made out of?

This is awesome, just wish my computer would load the step file so I could get into the model more.
The current version is 45A high-temperature silicone rubber tubing from McMaster, I believe 1" ID 1.25" OD, stretched around 1.25" aluminum tubing. We hope to Smith to some white 35A though to keep with our colour scheme (and maybe get some better grip on the ball).
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Unread 01-02-2017, 15:11
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Re: pic: Spectrum 3847 - 2017 CAD Model: Gamma Ray

Quote:
Originally Posted by fresh_prince View Post
The current version is 45A high-temperature silicone rubber tubing from McMaster, I believe 1" ID 1.25" OD, stretched around 1.25" aluminum tubing. We hope to Smith to some white 35A though to keep with our colour scheme (and maybe get some better grip on the ball).
We used that in our testing but it expanded too much. It looks like your're using a belted 2:1 reduction from a 775pro, have you not seen this expansion as well?
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Unread 01-02-2017, 15:17
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Re: pic: Spectrum 3847 - 2017 CAD Model: Gamma Ray

Quote:
Originally Posted by EricLeifermann View Post
We used that in our testing but it expanded too much. It looks like your're using a belted 2:1 reduction from a 775pro, have you not seen this expansion as well?
What speeds were you testing at? We were testing primarily at 6000 rpm and didn't notice any separation from the aluminum or excessive expansion.

Granted, we did used solid 4" conveyor wheels [I know them as fairline (Fairlane?) Wheels, but maybe Allen can reply with their proper name] to shoot in 2016, and those loved to expand so maybe we're just used to shooter wheel expansion.
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Last edited by fresh_prince : 01-02-2017 at 15:19.
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Unread 01-02-2017, 15:21
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Re: pic: Spectrum 3847 - 2017 CAD Model: Gamma Ray

Quote:
Originally Posted by fresh_prince View Post
What speeds were you testing at? We were testing primarily at 6000 rpm and didn't notice any separation from the aluminum or excessive expenses.

Granted, we did used solid 4" conveyor wheels [I know them as fairline (Fairlane?) Wheels, but maybe Allen can reply with their proper name] to shoot in 2016, and those loved to expand so maybe we're just used to shooter wheel expansion.
I don't know what we were spinning them at accurately but it was faster than 6000. The problem wasn't that the expansion was affecting the shots, its that I wasn't comfortable safety wise with the expansion. We were also using 2in roller over a 1.5 aluminum tube, so maybe the smaller diameter doesn't expand as much was we saw with the large.
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Unread 01-02-2017, 15:29
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Re: pic: Spectrum 3847 - 2017 CAD Model: Gamma Ray

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Originally Posted by EricLeifermann View Post
I don't know what we were spinning them at accurately but it was faster than 6000. The problem wasn't that the expansion was affecting the shots, its that I wasn't comfortable safety wise with the expansion. We were also using 2in roller over a 1.5 aluminum tube, so maybe the smaller diameter doesn't expand as much was we saw with the large.
Ah, that's fair. 1.5/2 does just have a lot more material to expand, so I wouldn't be surprised if our were also expanding but it's subtle enough to miss. Our shooter wheels are also boxed up so uncontrolled expansion should be relatively contained.
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Unread 01-02-2017, 15:34
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Re: pic: Spectrum 3847 - 2017 CAD Model: Gamma Ray

How many balls can you guys hold? Doesn't look like the traditional hopper to me, are you planning on intaking only?
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Unread 01-02-2017, 15:37
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Re: pic: Spectrum 3847 - 2017 CAD Model: Gamma Ray

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Originally Posted by jkelleyrtp View Post
How many balls can you guys hold? Doesn't look like the traditional hopper to me, are you planning on intaking only?
Our current estimates sit around 50 balls or so. We will have a hopper, the lexan sheets that it is made of have yet to be fully modeled though. There will be one panel on either side and an angled panel out over the fuel intake that will spring out when the intake is down, but be forced back into frame when the intake is pulled back up.
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Unread 01-02-2017, 15:42
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Re: pic: Spectrum 3847 - 2017 CAD Model: Gamma Ray

Quote:
Originally Posted by Cothron Theiss View Post
So if "vectored intake wheels" are now a thing, does that mean we can add mecanum to the list of misspellings of mecanum-err-vectored intake wheels?
NO.
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Last edited by Mecanum Wheel : 01-02-2017 at 17:18.
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Unread 01-02-2017, 15:54
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Re: pic: Spectrum 3847 - 2017 CAD Model: Gamma Ray

Great bot as always! I really like the built-in handles.

Nice work!
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