Re: re:re: infamous ballscrews

--- In CAD_CAM_EDM_DRO@egroups.com, ballendo@y... wrote:

> Steve G wrote:
> >I don't know what the "infamous 5/8 inch screws" are. Can you clue

me

> >in? Are we talking about ballscrews or Acme leadscrews?
>
> Steve,
>
> We're talking ballscrews. 5/8 diameter, .200 lead (5TPI) which is

probably

> the most common ballscrew in existence. When used with a full step

stepper

> drive these will give a resolution of .001". Half-step and you'll

get

> .0005".

That sounds very good. 5/8 should certainly be heavy enough for this,
although they will be unsupported at one end I won't be running a lot
of torque as I don't -really- want to cut anyone in half. And 5tpi is
probably just about right.

> Infamous?!? Probably because ballscrews, like most things, are made

in

> differing quality levels, and the person who pursues price only may

feel

> "burned" when the screws do not meet expectations... Not the screws
> fault :-)

Well, I'm not just pursuing price. I want to make sure I don't end up
buying hyper-accurate preloaded .000001 accuracy per foot teflon and
carbide ballscrews and nuts for something that just has to open a
door. :')

> Hope this helps.

Yes! All of you are being very helpful. Even ideas that I may have
considered, I'm getting new perspectives on this. I may have discarded
a particular idea because I don't have enough knowledge.

Thanks,
Steve Greenfield