Re: [CAD_CAM_EDM_DRO] Ball-screws

First, the .004"/foot is the "worst case" and it should be less than that as
a rule. If they are saying a repeatability of 50 micron, they must be
talking about the nut because the screw is not going to do any changing.
This would lead me to think that this is a preloaded zero backlash nut.
Darrell

----- Original Message -----
From: James Owens <wotisname@...>
To: <CAD_CAM_EDM_DRO@egroups.com>
Sent: Friday, July 21, 2000 7:48 PM
Subject: Re: [CAD_CAM_EDM_DRO] Ball-screws


> Hi Jon,
>
> I should have made this clearer, I wasn't referring to backlash when
writing
> about error. The error I was referring to is the 0.004"/foot error in the
> thread. This is the value I thought could be programmed out if it was
known
> and in which direction. The screws claim a repeatability of 50 micron,
> correct me if I am wrong but 0.000005" is quite small.
>
> I was under the impression that it is repeatability is the thing to go for
> in CNC? The other question I have, is the difference in price between a
> Bridgeport kit say $750.00 and the low quote I got of $166.00 plus two
extra
> nuts worth me paying. I cannot return it if it is wrong and the kit
doesn't
> fit. I can however make a 1" ball-screw fit my machine provided I do the
> machining of the ends?
>
> In short the question is will this work, does anyone have experience of
the
> McMaster-Carr ball-screws.
>
> Regards,
>
> Terry
>
>
>
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