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Unread 22-08-2009, 13:32
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Re: pic: Chassis Idea

Looks good... just a couple of suggestions:

- The angle bracing on your frame is excellent for structure, but they take up a bunch of space. One thing you could do instead is to replace the angle tube with an angled sheet brace on the bottom. This way, you could give your battery some more room, moving it away from the PD board.

- Leave room to put in a 2nd motor on the Super Shifters. Sometimes you need 2 per gearbox, sometimes you don't. If you leave room in the layout for 2 motors, you won't need to move things around later.

It takes guts to post your designs. Good for you for making a great design and showing it to us.

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Unread 22-08-2009, 23:50
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Re: pic: Chassis Idea

Another thing to remember on the supershifters you don't have any way to shift them shown (pneumatic or servo) which is something to remember because it all takes up space
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Unread 23-08-2009, 13:51
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Re: pic: Chassis Idea

Another electrical suggestion. Don't mount your gaming adapter down low in the frame especially that close to your high current victors and CIMs. You want the radio higher in the robot and away from sources of interference for optimal data transmission and minimal data loss.

I also agree that unless you have a very complicated robot, you'll likely only need one digital sidecar.

On wire size, the lower the AWG (American Wire Gauge) number, the larger the wire, more current carrying capacity, and lower resistance per foot resulting in lower voltage drop. Therfore, #6 is supplied in the KOP for your main power circuits, but you could use #4 and it would be legal. In cases where #16 is recommended you could use #14, 12, or 10 if you felt that voltage drop would be a significant issue and it would be legal. Just remember, larger wire is more weight, so unless you know you have a voltage drop issue, it's probably unnecessary.

Voltage drop is also directly related to efficiency. Voltage drop and wire resistance is Watts of wasted energy in heat. This can have a serious impact on battery performance when dealing with mechanisms which run at full power for long periods of time during a match. Vacuum venturis, high speed shooters and collector mechanisms are certainly worth watching for energy losses.

Keep thinking up new designs you're on the right track.
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Unread 24-08-2009, 07:52
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Re: pic: Chassis Idea

OK,
Electrical guy checking in...As Art and Jim have pointed out, you want to increase the size of your wire. Robot rules for many years have specified #6 minimum for all primary wiring. i.e. battery to main breaker to power distribution. Although robot rules allow for #12 for devices fed from 40 amp breakers we use and recommend #10. You can use the battery as counter weight so be ready to move it as needed. The power distro is better suited in the center of the robot. It is in this way that wire runs are minimized and balanced between the two sides of the robot. I can't tell you how many teams have come to me complaining they can't get the robot running straight when they have six feet of wire feeding the motors on one side and six inches of wire feeding the other. Although someone suggested to point the battery contacts down, I don't recommend this. Our high current applications will cause some venting from time to time and you (and the robot inspector) can't see if the terminals are getting into trouble when the battery is mounted that way. Remember that the sidecars do not pass a lot of current so they may be placed almost anywhere. I am suspecting a change in radios so don't dedicate yourself to that size package but do plan on getting it up out of the metallic clutter. In addition to the noise, there is significant reflections of RF down among the metallic parts.
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Unread 24-08-2009, 18:43
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Re: pic: Chassis Idea

That you everyone for all the help! Every bit of it has been taken into consideration.

(On the wires.. The largest I can get is 8 gauge... Does anyone know how to make Inventor make 6 or 4 gauge wires?)
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Unread 25-08-2009, 13:24
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Re: pic: Chassis Idea

Quote:
Originally Posted by Formerly Famous View Post
That you everyone for all the help! Every bit of it has been taken into consideration.

(On the wires.. The largest I can get is 8 gauge... Does anyone know how to make Inventor make 6 or 4 gauge wires?)
you have to create your own style for it or you can be lazy and just change the size of the segment.
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