Re: [CAD_CAM_EDM_DRO] Best source for inexpensive ballscrews?

On Fri, 2003-08-01 at 20:04, Bill Kichman wrote:
> Hey, those REID Tool ballscrews are priced well, thanks Sam! IF I read
> correctly, I can buy both a 24" and 48" screw and (4) ball nuts ( for
> preloading) for under $200!

> Now about preloading....Kim, can you please clarify how you did this? I
> understand that preloading is essentially squeezing (2) sets of ballscrew
> nuts against each other so the backlash is eliminated. How exactly was this
> done?

I've got picture that probably explain it better than words do, but here
goes...

Basically, one ballnut is mounted solid to the slide, carriage, table,
etc. This is done by screwing the ballnut into a box shaped piece of
steel and then bolting the second ballnut mounted, in a piece of steel,
to it.

The first ball nut is called the load ballnut because it is attached to
the load. We bought the "round" ball nuts. Our equipment didn't have
enough room for square ballnuts. Remember that the acme nut is much,
much smaller than even a single ballnut, so everything you do will be
scrunched for space.

The size of steel we used to screw the load ballnut into varied with the
axis and piece of equipment we were installing it in, but was typically
CRS, 1" x 1.5" or 1.75" x 4" wide. We drilled and tapped it for the
ballnut. It attaches to the slide or table with one or two good bolts.
Nothing very complicated.

The second piece of steel bolts to the first with 2 studs. The studs
mount in a blind tapped hole either in the load ballnut or the backlash
ballnut, depending on what fits the axis better. We always orient the
studs so they are accessible with the machine assembled. Drill holes in
the mount without the studs to accept the studs.

> Thanks again you guys are truly a great group. I just hope I can be
> of help too someday here...
> cheers
>
> R. William Kichman, P.E.
> Kichman Engineering Associates
> 103 Old Furnace Road
> Cornwall, PA 17016-0643
> tel/fax 717/270-0714
> ----- Original Message -----
> From: "sam sokolik" <samcoinc2001@...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Friday, August 01, 2003 9:21 PM
> Subject: Re: [CAD_CAM_EDM_DRO] Best source for inexpensive ballscrews?
>
>
> > The cheapest I found so far was from reid tool
> >
> http://www.reidtool.com/store/store/listCategoriesAndProducts.asp?idCategory=8194
> > This is a list of ball screws (thomson)
> > here are there nuts
> >
> http://www.reidtool.com/store/store/listCategoriesAndProducts.asp?idCategory=5351
> > look at the last 10 listings on the page. they are the nuts that go with
> the thomson ball screws
> >
> > sam
> >
> > Bill Kichman <billkichman@...> wrote:
> > Just curious what others have done in the way of obtaining cost effective
> > ballscrews for their conversions. I am doing a full sized mill conversion,
> > and simply cannot see spending $1k to $3k for a set of preload style
> > ballscrews for a hobby venture. What is the least costly solution?
> > Thanks
> >
> > R. William Kichman, P.E.
> > Kichman Engineering Associates
> > 103 Old Furnace Road
> > Cornwall, PA 17016-0643
> > tel/fax 717/270-0714
> >
> >
> >
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--
Kim Lux <lux@...>