I'm trying to pick a ball screw for my Y-axis. I thought I might ask for some advice. Here are my specs:
Motor: Servo with 1500 ozin Peak, 2000 rpm
Y-rails: THK rails 53.5" length
Target IPM (Inches per minute): 200 IPM
Target movement: About 48" movement for Y-axis
My Many Questions:
1. Is it really a big deal to have two ball nuts connected by a preload adjustable coupler? They say it helps with backlash. Worth the extra money?
2. On a ball screw, is 5/8" O.D. (outside diameter) too small for my specs? Is 3/4" O.D. too small? Should I go all the way to 1" O.D. ? I don't want it to whip around and such. Any advice?
3. Wouldn't a fatter screw mean more weight and thus mean it would be hard to start/stop? Should I not worry about this?
4. About how much does it cost to have the ends turned-down on a screw. Some I'm looking at haven't been turned down. It just shows thread all the way to both ends!
5. What Lead or Pitch should I be looking for? Is a Lead of 0.5" good (2 turns per inch of travel)? What about a pitch of .2 (5 threads per inch)? Ehhh, I'm confused, especially because I'm not sure what is good for accuracy/speed. Any hints?
6. On a related note, is 200 IPM too slow for a light-weight aluminum router? Should I aim for 300 IPM? I don't want it to dance around like a ballerina in the nutcracker!
Thanks for any replies............Sam
:cheers: