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Unread 28-07-2016, 00:00
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6X 775 - 6X 1.625" Drive

Because I don't design outrageous things enough...

each drive side is 8.03lbs with everything shown (only thing that should be missing is the M4s to mount the 775s. Didn't design out the full frame because meh.

Ratios is a 12:100 off the 775's with a 24:24 spacing ratio down to the wheel.
I chained the wheels together before that gear spacing so that the chain did not have to be routed up after every wheel for ground clearance;
so there is a stage of gearing down to each individual wheel.

Feel free to tell me how ridiculous this is.

Sorry for the large pics



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Last edited by pwnageNick : 28-07-2016 at 00:50.
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Unread 28-07-2016, 00:01
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Re: 6X 775 - 6X 1.625" Drive

Needs smaller wheels.
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Unread 28-07-2016, 00:06
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Re: 6X 775 - 6X 1.625" Drive

Would you consider making custom wheels if they're that small?

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Unread 28-07-2016, 00:11
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Re: 6X 775 - 6X 1.625" Drive

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Originally Posted by bkahl View Post
Would you consider making custom wheels if they're that small?

Stop being so negative, let him do what he wants
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Unread 28-07-2016, 00:26
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Re: 6X 775 - 6X 1.625" Drive

I think you need moar power .
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Unread 28-07-2016, 00:52
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Re: 6X 775 - 6X 1.625" Drive

What is this I don't even...



Seriously though, with so little ground clearance, couldn't this get stuck on something as small as an uneven spot in the carpet?

Also, you missed a golden opportunity to make a 38 wheel (19 wheels x 2 sides) gear-drive.

Last edited by cbale2000 : 28-07-2016 at 00:56.
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Unread 28-07-2016, 01:04
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Re: 6X 775 - 6X 1.625" Drive

Quote:
Originally Posted by cbale2000
Seriously though, with so little ground clearance, couldn't this get stuck on something as small as an uneven spot in the carpet?
1/2" ground clearance, there's been lower.
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Unread 28-07-2016, 01:15
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Re: 6X 775 - 6X 1.625" Drive

Why is there a pox of these going around? This is the 3rd such chassis thingy I've seen in the last week.

In any case, looks good. The weight in particular is fantastic. The only thing I would question is the use of 775pro drives due to availability and effectiveness, but apart from that it actually looks quite solid.
Why socket heads over buttons or flatheads?
What does the free speed look like?

EDIT: I always look forward to your models. They tend to be very innovative and pretty!
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Unread 28-07-2016, 01:35
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Re: 6X 775 - 6X 1.625" Drive

Quote:
Originally Posted by cbale2000 View Post
What is this I don't even...



Seriously though, with so little ground clearance, couldn't this get stuck on something as small as an uneven spot in the carpet?

Also, you missed a golden opportunity to make a 38 wheel (19 wheels x 2 sides) gear-drive.
Our 2013 robot had less than 0.25" clearance above the floor and the pan extended forward and behind our wheel base >_>

Yes carpet was an issue. But by comparison this has loads of ground clearance, and even more importantly it has leads in the front and back.
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Unread 28-07-2016, 03:44
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Re: 6X 775 - 6X 1.625" Drive

Why use plate and standoff construction only to cantilever the wheels? Is the easier wheel change worth more difficult bumper mounting and greater stress in the structure?

I don't mean to poke at something that is meant to be slightly whimsical. But if there is a legitimate reasoning, I would just like to know what it is.
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Unread 28-07-2016, 03:52
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Re: 6X 775 - 6X 1.625" Drive

Quote:
Originally Posted by Bryce2471 View Post
Is the easier wheel change worth more difficult bumper mounting and greater stress in the structure?
Yes, since the wheels have to be replaced between every match .

Nick most likely used plates instead of a piece of extrusion because it allowed him to maintain a decent amount of ground clearance. In order to do the same with a tube you'd end up tacking little plates on anyway, so you might as well simplify it.
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Unread 28-07-2016, 05:19
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Re: 6X 775 - 6X 1.625" Drive

Such pockets!
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Unread 28-07-2016, 09:48
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Re: 6X 775 - 6X 1.625" Drive

Can we get a render of just the gearbox itself?

I'm also concerned with the gearbox mounting method. Would there be any issues with the fasteners bottoming out on each other before you can get a solid joint?
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Unread 28-07-2016, 10:11
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Re: 6X 775 - 6X 1.625" Drive

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Originally Posted by Richard Wallace View Post
Such pockets!
And talk about all the weight savings on those wheels!
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Unread 28-07-2016, 11:03
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Re: 6X 775 - 6X 1.625" Drive

A 775pro drive gearbox could actually be viable. I know team 16 used 775pros for their drivetrain this year and it seemed to hold up really well with the unusual strain from the defenses. When talking to them at Worlds they said there weren't too many problems and it came down to the gearing. They would be better at describing it.
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