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-   -   pic: Spectrum 3847 - 2017 CAD Model: Gamma Ray (http://www.chiefdelphi.com/forums/showthread.php?t=154584)

fresh_prince 01-02-2017 14:50

Re: pic: Spectrum 3847 - 2017 CAD Model: Gamma Ray
 
Quote:

Originally Posted by lukekaiser (Post 1639128)
Very nice. What is the upper appendage intended for?

The roller with the mecanum wheel is our full-width fuel intake.

RoboChair 01-02-2017 14:52

Re: pic: Spectrum 3847 - 2017 CAD Model: Gamma Ray
 
Quote:

Originally Posted by fresh_prince (Post 1639133)
The roller with the Vectored Intake wheels is our full-width fuel intake.

Vectored intake wheels are the best.

D_Price 01-02-2017 14:55

Re: pic: Spectrum 3847 - 2017 CAD Model: Gamma Ray
 
Great looking robot there! Awesome cad work as always.

AllenGregoryIV 01-02-2017 14:56

Re: pic: Spectrum 3847 - 2017 CAD Model: Gamma Ray
 
Quote:

Originally Posted by Michael Corsetto (Post 1639127)
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.

Cothron Theiss 01-02-2017 14:57

Re: pic: Spectrum 3847 - 2017 CAD Model: Gamma Ray
 
Quote:

Originally Posted by RoboChair (Post 1639134)
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?

EricLeifermann 01-02-2017 14:59

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.

fresh_prince 01-02-2017 15:09

Re: pic: Spectrum 3847 - 2017 CAD Model: Gamma Ray
 
Quote:

Originally Posted by EricLeifermann (Post 1639141)
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).

EricLeifermann 01-02-2017 15:11

Re: pic: Spectrum 3847 - 2017 CAD Model: Gamma Ray
 
Quote:

Originally Posted by fresh_prince (Post 1639148)
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?

fresh_prince 01-02-2017 15:17

Re: pic: Spectrum 3847 - 2017 CAD Model: Gamma Ray
 
Quote:

Originally Posted by EricLeifermann (Post 1639150)
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.

EricLeifermann 01-02-2017 15:21

Re: pic: Spectrum 3847 - 2017 CAD Model: Gamma Ray
 
Quote:

Originally Posted by fresh_prince (Post 1639153)
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.

fresh_prince 01-02-2017 15:29

Re: pic: Spectrum 3847 - 2017 CAD Model: Gamma Ray
 
Quote:

Originally Posted by EricLeifermann (Post 1639157)
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.

jkelleyrtp 01-02-2017 15:34

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?

fresh_prince 01-02-2017 15:37

Re: pic: Spectrum 3847 - 2017 CAD Model: Gamma Ray
 
Quote:

Originally Posted by jkelleyrtp (Post 1639162)
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.

Mecanum Wheel 01-02-2017 15:42

Re: pic: Spectrum 3847 - 2017 CAD Model: Gamma Ray
 
Quote:

Originally Posted by Cothron Theiss (Post 1639139)
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.

holygrail 01-02-2017 15:54

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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