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#1
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Re: pic: 3 Hour Chassis + 2 Hours
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That 9.87:1 Toughbox seems interesting, but if we're going to buy more Toughboxes, we might as well just make our own (lighter) gearboxes. I just threw the Toughboxes in the CAD in the event that the team wanted to save money and use the Toughboxes we already have. |
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#2
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Re: pic: 3 Hour Chassis + 2 Hours
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I'm all for custom gearboxes, but if you want to keep it simple, you have a lot of options. |
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#3
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Re: pic: 3 Hour Chassis + 2 Hours
Running 12fps without shifting and using roughtop tread will lead to a lot of current issues as well as iffy acceleration.
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#4
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Re: pic: 3 Hour Chassis + 2 Hours
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#5
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Re: pic: 3 Hour Chassis + 2 Hours
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I've had good luck with carbide tooling and heavy feeds on 6, 2, and 7 series alloys. I assume because you're planning on welding it you're going to use a 5 series alloy, which has a "poor" machinability rating, which may well be your problem. |
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#6
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Re: pic: 3 Hour Chassis + 2 Hours
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#7
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Re: pic: 3 Hour Chassis + 2 Hours
6061 loses its temper when it's welded, so your 6061T6 becomes 6061T0, which according to wikipedia is an 80% loss in strength, which is what I've noticed/experienced with the welding and mechanical testing I've done.
Welding two aluminum alloy's together hasn't been an issue for me. Most, if not all, aluminum alloys will weld fine with the same filler material, so there shouldn't be much of an issue welding different alloys. Haas CNCs are pretty good machines, I used one in college. Tooling, though, shouldn't be confused with the mill itself. You could have the best CNC on the planet, but if a low-quality HSS endmill is chucked up it'll run like crap. Look into solid carbide tooling, if you're CNC'ing plates you could easily get away with a 1/4" end mill, or maybe smaller. McMaster: 8829A19 about $24 for an end mill that will make you many a robot frame. If you have good compressed air for chip clearing you could get a 4-flute which is even less expensive. IMHO, if you want to weld the chassis together (which I heartily approve of) you should CNC your side plates from 5052 (which has no temper and won't lose strength when welded) and then use AndyMark/KOP extrusions for your cross-bracing. It'll be a little less expensive, and you'll get tons of 1/4" mounting holes. My team's most recent chassis was made from CNC'ed and bent 5052 TIG welded to the KOP frame. I did the welding and found the 1/8" 5052 to be a very forgiving material to TIG. We dropped 3-4lbs in fasteners IIRC. |
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#8
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Re: pic: 3 Hour Chassis + 2 Hours
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______ |xxxxxx| |xxxxxx| |_____| so the center piece falls out. If you can use a 1/16 or 1/4 bit you can cut past the needed length/width just enough so that you end up with squared corners. |
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