Re: Who had some .100 pitch ball screws FS??

The problem comes in you're using 0.0394 instead of 0.039370079
which is arrived at by 1/25.4
The conversion is exactly 25.4mm = 1 inch. There is no
25.4000000xxxx fraction involved.

Graham


--- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Anderson <janders@n...>
wrote:

> skykotech wrote:
> >
> > I don't understand this. .1 pitch would be 2.54 and several more
> > zeros, not 2.538. I think it is like 2.54000000xxx something,
>
> Well I'm using an HP27S, program is MM=INCH/.0394 and it

yields .1" =

> 2.53807106599mm. I think 2.538 is close enough. 71 millionths is a
> ridiculously small number to be worrying about in a bench mill,
> amounting to about 4 tenths over 6" travel. Standard rounding up

would

> be of course, 2.54....
>
> Jon