Monday, March 9, 2009

Circles and angles, part 2

I had a couple thoughts about circles and using circles to approximate angles and using circles to reduce angles.
The second (covered here) is that the bigger a wheel is, the better it is at rolling over obstructions, or climbing angles - that applies any wheels: on cars, or in this case, mobile tool bases, benches and carts.
If you have a perfectly flat shop floor, small wheels (assuming that they are rated for the load and won't develop flat spots) are perfectly fine. If you have to go over any bumps like I do (there is a noticeable lip between garage floor and driveway for me) the larger the wheel, the smaller the angle of attack / the easier it will be to roll items across any floor height differences. Also, if your wheels do develop small flat spots, the problem will be less noticeable with larger wheels. 3 inch wheels are about the smallest I would want to use to make a heavy stationary tool roll, but for anything lighter weight that is going to stay in the shop, even the smallest casters would work fine. Something to consider when choosing mobile base options for equipment likes table saws. The mobile kit I got for my first table saw was useless & required me to physically lift the saw to clear even minor differences between concrete pads. There are "all terrain" kits out there now with larger wheels, but then they ruin things by making the clearance too low - makes me think of off-road vehicles without a lift kit. One side clears edge, only to high-center before you can get the other side up-and-over. A strong case for rolling your own. Snork.


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