Re: What makes a machine CNC ready?

> Well, I built a laser photoplotter that has a laser-writing carriage
> driven by a stepper motor.
> it travels at 10 steps/second, with each step = 0.001" at a continuous
> rate during the image
> generation. I used one of those cheap black Thompson screws first, and
> it proved the concept,
> but thread "drunkenness" ans backlash caused image artifacts. I then
> replaced the screw
> with a Kerk selected precision screw with the automatic plastic
> anti-backlash nut, and it works
> VERY well. It has zero backlash, and even .001" backlash would show up
> clearly in the plots.

>
> I think these Kerk screw/nut assemblies work quite well for low-load and
> moderate speed
> applications. And, the Kerk set cost almost 10 x more than the cheap
> ballscrew, but performs
> much better.
>
> Jon
>
>

Most precision ballscrews are X3 or X4 the price of the cheaper rolled ones so going to X10 and what advantages do you have over ground double nut ball screws?

John S.