Quote:
Originally Posted by sgreco
Looks really good!
Nice Work!
A couple suggestions:
You could definitely get away with 1/16 inch wall tube on the inner parts of the frame to save some weight.
I'm assuming you're welding the extrusion. The other thing is that my team found is if you cut the edges of the square tube extrusion to 45 degree angles where they meet at the corners, it is more structally sound.
Are those wheels the ones you posted before?
Looks really nice, the rendering makes it look very appealing.
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Thank you for the weight saving tip! I have been going through all of my options. I wasn't sure if that would be safe.
We are hoping to be able to weld it. Money and knowledge may hinder that though. If we can not then we will be creating brackets out of 1/16" Aluminum and riveting it together.
The wheels are a more recent version of what I posted. A picture of them can be found
here. If you go over one you can see it with the gear. (I haven't put the bolts in yet. I am about to do that when I have finished this post.)
Thank you for all of your help.
Quote:
Originally Posted by jamie_1930
My thoughts would be if you make it so that you can slide the battery in through the larger holes on the front (or back), and (this is something 190 did a while back) since you have a six wheel base I suggest moving the middle wheel down from the outer wheels. This is a common base that will tilt when you move allowing for a smaller turning radius and better maneuverability. This sometimes creates to much maneuverability or to little, depending on your needs. So in order to give yourself more, or less, maneuverability you can put high friction wheels in the middle and back sections and have the last two be omni wheels. This way if your driving one way you have high maneuver ability, while driving the opposite direction will allow you to stay more stable and go forward straighter for longer amounts of time without stray.
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| High Friction High Friction |
| |
| High Friction High Friction |
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| Omni Omni |
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I currently have a center drop of 1/16. I apologize for not mentioning that in my description.
Thank you for the tips on maneuverability.
Quote:
Originally Posted by Jared341
Very nice work! This is about as simple a box frame chassis as I've seen, and it is definitely a good start towards a top notch final design.
Some things to think about when designing a chassis (obviously some of these are dependent on the game and rules):
- How will we ensure that our chains will be properly tensioned?
- How we will adjust the drop of the center wheel (if any)?
- How will we mount our bumpers?
- How will we fix X when it fails? X = wheels, sprockets, chain, gearbox, motor, speed controller, cable, frame members, welds, etc. (and how long would such a repair take?)
- What sorts of COTS and custom made spare parts will we want to bring to competition with this drive base?
- Do we have easy access to all bolt heads, nuts, rivets, etc., for tightening or loosening?
- If something must go to make weight, where will we start?
- What is the center of gravity, and how can we move it to where we want it to be?
- How long will it take to build this once build season starts?
- How much does it cost? Can we lower the cost somehow?
- What are the wiring paths?
- Where can we put the battery?
Hope this helps!
My only two questions/comments about your particular chassis are (1) if there is a ramp to climb, you will probably want to move your wheels further to the front and rear of the frame and (2) how do you plan on supporting the plywood base in the middle? |
Thank you for that list. I have only considered a few of them, and I will definitely be keeping all of that in mind as I perfect this design.
That is a good point, I had not thought about any ramps. The nice thing is that no design changes will need to be made; just the location of the wheels.
I am considering that at the moment. I have thought about mounting an aluminum cross beam in there. Do you have any suggestions?
-Rion