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What are your thoughts on ballscrews vs r&p? Is whip an issue with higher ipm on a long machine (4x8)?
by aaronblohowiak 5y ago
What are your thoughts on ballscrews vs r&p? Is whip an issue with higher ipm on a long machine (4x8)?
- abakker 5y agoball screws are better, more expensive, and more rigid. to get them longer than ~50 inches you probably want to either get ones with a very high lead angle, or use ones with a driven ball nut design. R&P works totally fine for wood and aluminum, and is significantly cheaper and easier to implement. Once consideration is that in driven ball nuts and R&P the motor must traverse with the moving axis. In standard ballscrew config the motor can be static which makes cables and packaging easier.
- abakker 5y agoI should add - rotational inertia becomes a detractor with big ballscrews, too. An 8ft ballscrew weighs a lot, and that can make positional overshoot a problem with steppers or servos. Also, most ballscrews that hobbyists buy are rolled screws, and I've never encountered one of those that was super straight. it doesn't matter much for accuracy if they are a bit warped if the bearing support is done right, but it sure can make the whip a problem.