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Unread 05-14-2012, 07:31 PM
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pic: 6WD Sheetmetal Chassis

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Unread 05-14-2012, 07:40 PM
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Re: pic: 6WD Sheetmetal Chassis

It looks really good.
I'd say the lightening pattern is rather conservative, so if you're pressed for weight, you could probably take some more out.
Looks like you might have more rivets than you really need on the gearboxes, but better to have too many than too few I suppose.
This may be something you intentionally didn't add, but you may want to consider a bellypan for reasons ranging from enhanced rigidity to convenient location for electronics.
My only other thought was that you might want to add more overlapping/connecting material at the corners. I have modeled a couple drivetrains like this, but have never built one of them, so I will defer to someone with more experience on this aspect.
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Unread 05-14-2012, 07:43 PM
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Re: pic: 6WD Sheetmetal Chassis

That desgin, but i think chaining only the lower 4 wheels so the bot can turn better
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Unread 05-14-2012, 07:46 PM
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Re: pic: 6WD Sheetmetal Chassis

Quote:
Originally Posted by IanW View Post
It looks really good.
I'd say the lightening pattern is rather conservative, so if you're pressed for weight, you could probably take some more out.
Looks like you might have more rivets than you really need on the gearboxes, but better to have too many than too few I suppose.
This may be something you intentionally didn't add, but you may want to consider a bellypan for reasons ranging from enhanced rigidity to convenient location for electronics.
My only other thought was that you might want to add more overlapping/connecting material at the corners. I have modeled a couple drivetrains like this, but have never built one of them, so I will defer to someone with more experience on this aspect.
I am planning on adding cross supports over and under the gearboxes for added rigidity.

Quote:
Originally Posted by 2185Bilal View Post
That desgin, but i think chaining only the lower 4 wheels so the bot can turn better
Ummm. I'm not quite sure what you are saying here. I stated that I dropped the center wheel 1/8"
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Unread 05-14-2012, 07:59 PM
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Re: pic: 6WD Sheetmetal Chassis

Tip: If you dropped the center wheel 1/8" you will have 1/4" of rock in your chassis because it will not sit as it does in your CAD. If this is the case and you actually want 1/8" of rock I suggest either raising an outer wheel 1/8" or dropping the center only 1/16"

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Unread 05-14-2012, 08:03 PM
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Re: pic: 6WD Sheetmetal Chassis

A few questions:
-What size rivets are they, and at what spacing?
-Why the 0.090" 5052? We looked at 5052 this year, but decided to go with 0.063" 6061 (and later decided we should have gone with 0.050" 6061). A thinner material would be lighter, and 6061 0.063" is strong enough for a FIRST robot with bumpers.
-Any details on the shifter, specifically the ratio and shaft design?

And finally, any plan to remove the transmission in vehicle if you ever have to? It looks like it would be very, very difficult to work on anything inside the transmissions as it is now. Even though it would possibly weigh slightly more, you could pocket out the space of the transmission side plate that is integrated into the frame, and put another plate over it. The transmission would then be a single assembly bolted into a hole on the frame.
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Unread 05-14-2012, 08:16 PM
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Re: pic: 6WD Sheetmetal Chassis

Quote:
Originally Posted by apalrd View Post
And finally, any plan to remove the transmission in vehicle if you ever have to? It looks like it would be very, very difficult to work on anything inside the transmissions as it is now. Even though it would possibly weigh slightly more, you could pocket out the space of the transmission side plate that is integrated into the frame, and put another plate over it. The transmission would then be a single assembly bolted into a hole on the frame.
Seconded. We had a sticking transmission at Worlds, so we took the whole thing out and put in our spare in a few minutes. Definitely an important consideration.
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Unread 05-14-2012, 08:23 PM
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Re: pic: 6WD Sheetmetal Chassis

Answers are in bold.

Quote:
A few questions:
-What size rivets are they, and at what spacing?
3/16" at 1/2" spacing
-Why the 0.090" 5052? We looked at 5052 this year, but decided to go with 0.063" 6061 (and later decided we should have gone with 0.050" 6061). A thinner material would be lighter, and 6061 0.063" is strong enough for a FIRST robot with bumpers.
I decided on .09" 5052 because that's what I've seen many teams use and since it was my first sheetmetal chassis I thought that would be a good starting point.
-Any details on the shifter, specifically the ratio and shaft design?
The shaft is made custom on a lathe/mill. I will try to upload a pic of the actual shaft but it is not letting me put an attachment in this post.
And finally, any plan to remove the transmission in vehicle if you ever have to? It looks like it would be very, very difficult to work on anything inside the transmissions as it is now. Even though it would possibly weigh slightly more, you could pocket out the space of the transmission side plate that is integrated into the frame, and put another plate over it. The transmission would then be a single assembly bolted into a hole on the frame.
I am going to pocket out the flanges above the transmissions. I am also probably going to remove the rivets attaching the transmission to the chassis and replace them with bolts for easier removal.
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Unread 05-14-2012, 08:37 PM
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Re: pic: 6WD Sheetmetal Chassis

Over All GREAT Looking Chassis!
But I still have things that I would recommend you change to improve it

- I would change your lightening holes to Triangles rather than circles. It will help you lose more weight and can be stronger.
- I love the way you have the supports on the transmissions. But it will still torque your side plates. You will want to put some sort of cross braces of some sort. It could be just bottom braces though, just to pull in the bottom of the transmissions. TRUST ME! They will torque and your chassis WILL be warped. But Then again Bottom and Top braces will be better.
- Good job with the extended Top flanges. It will help keep your side plates in line properly.
- If I am looking at this correctly. Why are your axles live with that type of Chaining? you only need Live axles if they are passing threw plates (the wheel is on one side of the plate, and the sprocket is on the other). You will save weight if you change to Dead Axles. The only one that must be live is the middle wheel because it is direct driven.

Great job for your First Sheet-metal Chassis!
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Unread 05-14-2012, 08:52 PM
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Cool Re: pic: 6WD Sheetmetal Chassis

Quote:
Originally Posted by O'Sancheski View Post
Ummm. I'm not quite sure what you are saying here. I stated that I dropped the center wheel 1/8"
ohh im sorry, i was saying that i really like the design but i would only chain four wheels, and in the front put like omni-wheels so the turn ability is increased. Like the way the u have it now, it will turn but not as fast as it could
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Unread 05-14-2012, 08:56 PM
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Re: pic: 6WD Sheetmetal Chassis

Quote:
Originally Posted by 2185Bilal View Post
ohh im sorry, i was saying that i really like the design but i would only chain four wheels, and in the front put like omni-wheels so the turn ability is increased. Like the way the u have it now, it will turn but not as fast as it could
As has already been stated, the center wheels are dropped to ensure smooth turning. Generally, to improve turning performance, you can either drop the center wheels or add omnis at one or both ends. Doing both is not necessary.
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Unread 05-14-2012, 08:58 PM
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Re: pic: 6WD Sheetmetal Chassis

Quote:
Originally Posted by smistthegreat View Post
As has already been stated, the center wheels are dropped to ensure smooth turning. Generally, to improve turning performance, you can either drop the center wheels or add omnis at one or both ends. Doing both is not necessary.
Would you recommend the multiple powered omnis or the drop center?
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Unread 05-14-2012, 09:02 PM
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Re: pic: 6WD Sheetmetal Chassis

Quote:
Originally Posted by 2185Bilal View Post
ohh im sorry, i was saying that i really like the design but i would only chain four wheels, and in the front put like omni-wheels so the turn ability is increased. Like the way the u have it now, it will turn but not as fast as it could
That is not true. A drop center will act as if there is not an extra 2 wheels. In other words, it will act as if it is a 4wd with a smaller wheelbase.
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Unread 05-14-2012, 09:24 PM
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Re: pic: 6WD Sheetmetal Chassis

Quote:
Originally Posted by akoscielski3 View Post
- If I am looking at this correctly. Why are your axles live with that type of Chaining? you only need Live axles if they are passing threw plates (the wheel is on one side of the plate, and the sprocket is on the other). You will save weight if you change to Dead Axles. The only one that must be live is the middle wheel because it is direct driven.
The only live axles are the center shafts which are direct driven off the transmission. The outer 4 wheels are dead axles with a 22T #35 chain sprocket.
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Unread 05-14-2012, 09:26 PM
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Re: pic: 6WD Sheetmetal Chassis

Quote:
Originally Posted by O'Sancheski View Post
The only live axles are the center shafts which are direct driven off the transmission. The outer 4 wheels are dead axles with a 22T #35 chain sprocket.
Okay I am looking at it wrong then. What are the circle on the outside wheels, that to me look like bearings?
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