Re: fitting ballscrew ends

Hi folks…

Speaking as a mini-lathe neophyte with a bunch of rolled 5/8 inch
screws that need the ends finished…. I'm not all that concerned
about the hardness of the screws. Between grinding and cutting, I
think I can turn the ends ok. FYI, there is a very good documented
procedure at http://www.5bears.com/cnc16.htm that describes how
to finish screw ends using carbide cutting tools and sandpaper.

However, I think what Dave (turbulatordude) and I both seem
concerned with is that (in his words)… [the] "main concern is to get
a perfectly flat shoulder on the screw". FYI... there is a good
picture at the 5bears site that shows what (I think) Dave is
saying... the picture is right next to the text titled 'Secret
Trick#4'. The shoulder is not a constant height around the shaft.
Instead, it varies as a function of the pitch.

In my case, a 10mm ID angular contact bearing will butt up against
the 'shoulder' that is left after turning the ends. I thought about
turning the ends and then sliding a (maybe 1/2 inch long?) `cap'
over the end to provide a constant surface area for the contact
bearing to butt against.

Anyway, I'm looking forward getting comfortable with some freak'n
approach and finally do'n something with those darn ends.

:-)

Mike

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Leslie Watts"
<leswatts@a...> wrote:

> >The idea I get from your posts is to make a sleeve that has the ID
> >that would fit the OD of the balls. chuck up the shaft and with
> >balls, slide the cup/sleeve over the ballscrew, with balls inside.
> >now, the sleeve OD would be concentric to the minor dia of the
> >ballscrew. hold that sleeve in the streadyrest and turn the

bearing

> >and pulley end of that section.
>
> >Dave
>

*snip*