Quote:
Originally Posted by IraJason
The sprockets on the wheels are the same as on the gearbox, which I believe are the 15 tooth sprockets from Andy Mark, so the output shaft to the wheels are at 1:1. I calculated the speed on this, and it came out to about 3.63 ft/s. No where near the speeds that some FRC robots get to, but for my purposes it will probably be plenty fast.
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And lastly, never underestimate the power of extruded aluminum. It may be a bit heavy, but it's so easy to work with.
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Ira,
Way to go! This is a great project. Thanks for choosing AndyMark as a supplier for the gearboxes.
You may find that your resulting speed is a bit faster than what you calculated. Here is my speed calculation for your setup:
Working motor rpm: 4200
Gearbox reduction: 12.76:1
Gearbox output rpm: 329
Sprocket ratio: 1:1
Wheel rpm: 329
Wheel diameter: 4 inches
Robot speed: 5.75 ft/sec
Your use of t-slot extrusion is great. I love the way your have your wheel positions take up the slack for chain tension.
This is a cool drivebase to show off around school and other places. You may want to bow a piece of 3/32" or 1/16" thick polycarbonate over the top of the electronics to protect that expensive stuff.
So... what is next? What are you gonna use this thing for? Here are some ideas:
1. Chase Kressly around the school hallways.
2. Put a chair on it (and some simple bumpers) and make it a wheelchair
3. Put an air cannon on it
4. Contact a company and let them be creative with using your design, much like what
Art Dutra did with this Mt. Dew "Dewbot".
Good job, Ira.
Andy