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Unread 26-01-2002, 20:03
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Our wheels don't touch the ground!

Well, we put together our drive train today, and it appears that our wheels don't touch the ground. The worst part is that I am the one entirely responsible for the calculations on our drive train. The upshot is that we have almost zero rolling resistance, however our robot seems to travel quite slowly. Oh well, back to the drawing board...
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Unread 26-01-2002, 20:12
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thats not good at all. i would show our new drive train but i won't. i don't want to give away all our tricks of the trade, if we have any. all that will come later.
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Unread 26-01-2002, 20:44
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That has got to suck

That has got to suck.
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Unread 26-01-2002, 21:08
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Easy Fix??

Cant u just change the height or position of what the wheel is mounted to??

Actually, how can they not touch the ground if u put the robot on the ground? Isnt that something that could be very noticable if u make any kind of simple picture/print?

Or, are u trying to fool us by saying that....but u probably dont have any wheels cuz u have a hover craft...and u are using pneumatic wheels on the side of your bot (they wouldnt touch the ground) as bumpers? similar to tug boats....lol


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Unread 26-01-2002, 23:07
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wheels not touching ground

A lot of teams will see that when their base got welded together, or somehow bolted together, the resulting base become bent sometime during the process, making the wheels not touching the ground.

A quick way to fix it is to remove the wheels, put the base on the ground, and use a soft mallet and hammer it flat. We have been doing that for a couple of years, and the base always came out really well. Just make sure you are hammering with controlled hits.

The other way, or course, is the lift up the height of brackets or wheel mounts to make sure the wheels touch, but you probabmy want to hammer you base a little bit to get good straight surface on it to mount your components correctly. If the base isn't flat, then you will see that legs of components won't completely lay flat on the base, which means you will need ways to stack up washers or whatever you can find under those components for a solid connection.

Bottom line, try to get you base flat and in good shape before you start attaching components on it.
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Unread 26-01-2002, 23:21
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Re: wheels not touching ground

Quote:
Originally posted by Ken Leung
A lot of teams will see that when their base got welded together, or somehow bolted together, the resulting base become bent sometime during the process, making the wheels not touching the ground.

A quick way to fix it is to remove the wheels, put the base on the ground, and use a soft mallet and hammer it flat. We have been doing that for a couple of years, and the base always came out really well. Just make sure you are hammering with controlled hits.

The other way, or course, is the lift up the height of brackets or wheel mounts to make sure the wheels touch, but you probabmy want to hammer you base a little bit to get good straight surface on it to mount your components correctly. If the base isn't flat, then you will see that legs of components won't completely lay flat on the base, which means you will need ways to stack up washers or whatever you can find under those components for a solid connection.

Bottom line, try to get you base flat and in good shape before you start attaching components on it.
Yow! Isn't this a really big hassle? Why not go with extrusion? Or a flat sheet of Al, that has "Wheel Wells" machined in? Extrusion *IS* expensive... but MAN! I've fallen in love with it! 8) It is *well* worth the extra cash, if you can afford it. IMO.
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Unread 27-01-2002, 00:16
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And if all else fails, use duct tape to mount the wheels/motors where you need them. A semi-decent last resort.
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Unread 27-01-2002, 00:18
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Quote:
Originally posted by EddieMcD
And if all else fails, use duct tape to mount the wheels/motors where you need them. A semi-decent last resort.
duck tape is not a legal material eddie
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Unread 27-01-2002, 01:44
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Considering the amount of engineering and design hours going into our drivetrain I would quite literaly shoot myself in the head if that happened.

Try re orientating the gear box? perhaps on its end it might work? Cant offer much advice without knowing your design, and I dont expect you to tell...

Good luck man, us rookies share your pain.
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Unread 27-01-2002, 02:38
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Hey zan dont worry about it man we all make mistakes. I am the captain of my team and Atleast your team members dont promise death if you make a mistake like my team does. Its your first year we all screw up and this stuff happens to teach us lessons. If you need any help im like a stones trow away in culver city. My team would be more then happy to help if they arent too busy killing me for making a mistake.

Im serious guy if you need any help dont hessitate to drop me a line.
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Unread 29-01-2002, 00:47
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Well, I think I better explain. In my calculations, I think I got radius and diameter confused, and the wheels ended up about half an inch off the ground. We can't just lower them, because then their sprocket would hit the frame. However, we found a nifty little solution, but I still feel pretty stupid for not noticing that anything was amiss until the thing was assembled.
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Unread 29-01-2002, 16:40
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If you don't mind telling, what was the solution that you came up with?
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Unread 29-01-2002, 19:35
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Unhappy wheels don't touch

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