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pic: WCD Sheet Metal Concept Chassis
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Re: pic: WCD Sheet Metal Concept Chassis
Looks sharp, where are the wheels from and what cad did u use, the render looks sharp
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Re: pic: WCD Sheet Metal Concept Chassis
Very very nice! I've got a design that's quite similar to this brewing.
Out of curiosity, why drive the rear wheel, instead of the middle wheel? I've always found that it's easier to distribute the weight of the base when it's centered. I really dig this design. Keep plugging at it! |
Re: pic: WCD Sheet Metal Concept Chassis
if you are going to do this make sure that the chain is not going through a tube, my team did something exactly like that for 2008 and it ended a very badly, we dremeled at least 5 holes in the cover at competition in order to fix it. also, be sure to leave a lot of space between the chain and its cover, otherwise when in operation the chain vibrates just a little bit and hits the cover. as long as you dont have those issues, that drive looks fantastic.
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Re: pic: WCD Sheet Metal Concept Chassis
How would you tension the chains? Will you just CAD them to be the right distance apart?
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Re: pic: WCD Sheet Metal Concept Chassis
I have a question in general about the WCD system, are you using generic bearings/bushings int he sheet metal for the axles, or are there some special ones?
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Garrett, it looks awesome. ;) |
Re: pic: WCD Sheet Metal Concept Chassis
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I have a few reasons for going with the rear direct drive. -I wanted to start off with a good majority of weight behind the middle wheels in order to reduce the amount of rock the chassis experiences while driving. -I also wanted the maximum amount of open mounting space for electronics without the gearboxes getting in the way. -With this design I'm able to put the battery closer to the center of the chassis, which helps a lot in balancing things out, and since the battery weighs more than the shifters, its placement on the chassis is more critical (at least in my opinion). -And of course... because it looks cooler :p Quote:
is more than enough distance from the chain to the rail, and my chain tensioner (coming soon) will help hold the chain away from the rail itself just for added protection. Thanks for the advice though :D Quote:
Though most teams make their own bearing blocks for their chassis, team221 sells them, and yes the hex bearings I used are AM's. |
Re: pic: WCD Sheet Metal Concept Chassis
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I like this drivetrain... reminds me a lot of Vex. :) Now for my design questions... I have no experience, so these comments are worthless. Would it make sense to add some fillets to the triangular cutouts in the sheet? What if you had the inner flange bend in toward the chassis, so you could rivet the belly pan to it? This would also increase the serviceability of the drivetrain by giving you more access to the chain. |
Re: pic: WCD Sheet Metal Concept Chassis
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As for the CAD render: if the side rails are open on the bottom for chain accessibility, are there supports on the inside of the rail to keep it from buckling in on itself? The channel shown in the reflection of the render makes be believe the side rails are very prone to torsion. I also like the rear-wheel drive; Drop-center drive train designs are TOO easily turned if the weight is close to the middle, so putting most of the drive train/electronics weight towards the back allows for more flexibility in weight distribution when designing manipulators. The tradeoff is less maneuverability if a chain comes off or breaks. |
Re: pic: WCD Sheet Metal Concept Chassis
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Re: pic: WCD Sheet Metal Concept Chassis
Looks good! I like your design. I would, however, encourage you to put the transmissions in the middle. It will help the chassis' ability to turn both from an inertia standpoint and from a "reducing scrub" standpoint.
How are the sections fastened together? O'all weight? Just a thought: some nuts like these fastened on the inside of your drive modules might be a great way to tie components/chassis elements together. http://www.aircraftspruce.com/menus/ha/nut_anchor.html I realize Aircraft Spruce isn't the cheapest place to buy things, but it's the first source that came to mind. |
Re: pic: WCD Sheet Metal Concept Chassis
A properly designed and CNC machined drive train shouldn't need chain adjustment once the chain stretches. If careful attention is paid to ensure the sprockets are well aligned with an easy to use chain tensioner, then there should never be any broken/popped chains as long as you aren't exceeding the maximum force of the weakest link in the roller chain. A master link is only 60% of the strength of a regular link, but you can eliminate the need for master link if you use a tool like the DarkSoul chain breaker.
Also, you really should put the transmission on the center wheel, and drive the front and rear wheels via roller chains. It all comes down to reliability. In the odd chance a chain does fail, losing the chain between the rear wheel and center wheel would also take out the front wheel from the picture as well. By moving the transmission to direct-driving the center wheel, losing a single chain means only losing a single wheel. And because the center wheel can never lose power if a chain breaks, you'll still be able to drive whether you're tipped to the front or back. Quote:
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Very good point about the 6wd reliability. I would keep chain tensioners as an option, check out the AndyMark floating tensioners as a simple and cheap option. |
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