Re: [CAD_CAM_EDM_DRO] Re: What makes a machine CNC ready?

On Thu, 29 Jun 2006 20:49:16 -0500, you wrote:

>This is a rolled-thread screw with a plastic nut. A 2 foot length
>selected for the level of
>precision I needed (I think it is about .001" per foot, cumulative) ran
>under $150 for
>the screw and nut. I'd never get CLOSE to that price for a ground
>ballscrew with anti-
>backlash nut.

Jon - I can buy a good "precision rolled" ballscrews with adjustable
anti backlash nut and wipers for little more.

There are GOOD rolled screws out there and they are not that expensive.

0.001 per foot is not that precise, it's grade 3. That's 25.4um per
foot, the screws I use are 0.052um per foot (grade 7;) and are the ones
priced here.

As an example..

16x4mm is $32 per foot, $91 for the screw and $18 for the seals.

I can also get the ends machined and threaded by the supplier to suit
preloaded bearings for another $40. (Worth it IMO).

Steve Blackmore
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