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1  Forum 2005-2010 (read only) / Interfacing / Re: Torque and Weight on: June 29, 2010, 04:42:30 pm
Sounds like a good suggestion, thanks for the help!
2  Forum 2005-2010 (read only) / Interfacing / Re: Torque and Weight on: June 29, 2010, 03:40:30 pm
I'm sorry if I was unclear.  What I am looking for at this juncture are motors, but I don't know what kind of torque to look for (as torque seems to be a defining factor, and at the moment I am not overly concerned with power consumption).

The casters I mentioned could be something like this: http://www.sparkfun.com/commerce/product_info.php?products_id=320

Just to throw out some numbers, I suppose it could be assumed that I want to use 2'' wheels and that a movement rate of 60 RPM is ideal.

If there isn't a simple equation somewhere that will give me the nice number I want, I may have to go with your idea jack (thanks!).

EDIT:

Wow.

You must have finished crafting that just as I made my post, which seems to answer some of the assumptions you made. Thank you very much for those equations! This will be very helpful!
3  Forum 2005-2010 (read only) / Interfacing / Re: Torque and Weight on: June 29, 2010, 01:20:59 pm
If we were to assume the world is perfect, and the only friction my bot experiences is from the wheel's contact with the ground, where would be a good place to start?
4  Forum 2005-2010 (read only) / Interfacing / Torque and Weight on: June 29, 2010, 12:24:34 pm
What's a good way to determine how much weight a motor with a given torque can carry?

Given a basic (7''sq) setup:

_____
|       |
m     m
|       |

(where 'm' is a motor, with casters at the corners to support weight)

With, say, 5 lbs of weight evenly distributed across the top of the bot, how much torque would I need to move it?
5  Forum 2005-2010 (read only) / Interfacing / Re: MaxSonar detection issue on: June 19, 2010, 06:49:15 pm
The sensor's product page: http://www.maxbotix.com/MB1240__XL-MaxSonar-EZ4.html

(The forum wouldn't let me post a link in my first post)
6  Forum 2005-2010 (read only) / Interfacing / MaxSonar detection issue on: June 19, 2010, 06:48:12 pm
For my current project, I'm using a XL-MaxSonar-EZ4 MB1240 (see next post) to gather range measurements, that I send to my PC with a Duemilanove. My problem, is that the sensor seems to be sending its pulses out at an odd angle. I found that in order to get an accurate reading from the sensor to a target of known distance (with good reflectivity, and in open space), I have to tilt the sensor up almost 45 degrees. Has anyone else had this problem?
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