That's a good point...a smaller servo with the appropriate gear/belt might not be all that bad...
Related question: when designing a (for home use) cnc router, is it okay to 'ballpark' the weight and force requirements of the axes, and then start shopping for motors? In other words, if I take the z-axis and figure out how much the nut/plate/motor mount weighs, and add the weight of the router motor, figure the net torque factor transmitted at the nut (after both the servo gearing and the ball screw) add a coefficient of friction -- then add the required downward pressure for typical routing/drilling -- then add a buffer of about 50% -- is that the way to come up with an idea of my servo requirements?
I'd really like to buy/build all the electronics, and have something to play with on my bench (actually hooked up to a PC, with CAD/CAM running) -- before I start building the router itself.
Is that a good way to think about this?
Thanks,
Chris |