Belts or Balls getting me Screwed up! Help I need advice Please.

[longy]

Hi everyone, I've had a play around with the design and changed the orientation round. It won't be a problem working over the side rails and as Jazz said it will make the machine stronger. Going to order the rails from china as I don't mind waiting a few weeks as I have lot of other things to do.

I would like your views on the ball screws to use ? so I can order these as well. I'm mainly going to be cutting and engraving wood and phenolic (laminate) and some plastics. Next will be the motors and drivers but not in a rush at the moment due to a lack of funds.

Your help will be much appreciated in getting the right ball screws.
TiA Mike

[JAZZCNC]

Your help will be much appreciated in getting the right ball screws.

You want 10mm pitch for X & Y axis 5mm for Z axis. Now personally I'd go for 20mm diameter at this length and sacrifice a little acceleration/speed in favor of reducing potential for whip compared to 16mm diameter.

Now the ratio I was talking about before comes from how you attach the motors to the ballscrews.? I always connect the ballscrews to the motors with Timing belts & pulleys. Doing this reduces affects of resonance on the motors and gives smoother running motors but it also allows a Ratio to be applied if needed.
This ratio can be applied both ways to either give Higher resolution and boost torque but at the cost of Speed or increase speed at the expense of torque and Resolution. Now in practice 10mm pitch with a 1:1 ratio works great for anything but fine engraving or work that requires high resolution. But if needed then a quick pulley change to 2:1 and you instanly get higher resolution.!

Can I also suggest you price up Profiled linear rails from Chai before buying the Round type.? . . . I think you may get a pleasant surprise.!
Even the cheap range of profiled linear rails blows the round type out the water and the slight difference is money well spent.