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-   -   Bumper or No? (http://www.chiefdelphi.com/forums/showthread.php?t=41451)

Kirk 10-01-2006 23:19

Re: Bumper or No?
 
You might want to consider 6 wheels. Our base is 2" off the ground and we clear the top of the ramp by about 1/4". Just a thought.

~Kirk

blue_crew 10-01-2006 23:54

Re: Bumper or No?
 
Quote:

Originally Posted by Kirk
You might want to consider 6 wheels. Our base is 2" off the ground and we clear the top of the ramp by about 1/4".

how far apart do you have your wheels?

Ianworld 11-01-2006 00:03

Re: Bumper or No?
 
A ramp contacts an arc starting at the base of your front wheel, reaching some peak(dependent on the distance between your wheels and the angle of the ramp) and then going back down towards the rear wheel. 6 wheels, this works out just between the wheels which is why it removes a large portion of the raised chassis. The bumpers In theory I suppose could follow this arc staying between the 2 1/2" and the 8 1/2" marks. As for the front and the back of your robot, 2.5" is probably high enough but you should check it out with your own design. Hope that helps.

TimCraig 11-01-2006 01:19

Re: Bumper or No?
 
Quote:

Originally Posted by Wayne Doenges
One of our engineers figures you need at least 4" of ground clearance to not high side your robot on the ramp. If this is true, than how can you have your bumpers 2.5" above the ground and still get up the ramp? Even if you have you bumpers at the highest allowable point at 3.5" (5" of bumper down from 8.5" max.).
I can also see allot of contact above the bumper zone and the 5 point penalty :ahh:

My preliminary cut at it says the 2.5 or even the 3.5 inch height to the bottom of the bumper limits the size and placement of the front wheel(s). It favors robots with small wheels. If we put bumpers on the front of the robot we expect to build, it will drag slightly going up the ramp.

Kirk 11-01-2006 01:28

Re: Bumper or No?
 
Quote:

Originally Posted by blue_crew
how far apart do you have your wheels?


We have 6" wheels mounted flush with the end of the frame front and back with the base running the long way. So we have 10" between wheels. Just something to think about.

Good luck
~Kirk


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