Re: [CAD_CAM_EDM_DRO] mounting ballscrews onthe ol mini mill help

well. they will be short......the longest of the two
will be 12 inches after cutting to fit the table and
the other about 9 inches.

will this work? i hope i havent wasted my money on
these ballscrews.
you say to preload the bearings on one side
only....you mean on one side of the bearings or one
side of the ballscrews?? because i had planned on
preloading them against eachother on one side of the
ballscrew.
and what do you mean by dealing with the axial
clearance??
--- Les Watts <leswatts@...> wrote:

> Well, there isn't going to be much compression load
> on a 3/8"
> screw.... it would buckle unless it was very very
> short.
>
> I think you could get away with regular conrad type
> ball bearings
> if you deal with the axial clearance. Note that on
> these bearings
> the inner race can move around axially quite a bit.
> This would cause
> massive backlash. But you can use pairs preloaded
> against each other. That really turns them into
> angular contact
> bearings with a few degrees contact angle. They are
> spaced
> with an inner and outer sleeve of slightly different
> lengths.
> Do this on one end only.
>
> Ordinary deep groove ball bearings are rated for
> light thrust loads-
> all bets are off if you get shock loads from a crash
> or something
> though. But hey- these are $3 bearings.
>
> You can get single and double row angular contact
> and tapered
> roller bearings easily at places like MSC, Grainger,
> and Reid
> if you want. They can cost much more and yes might
> be hard to find in
> such a small size.
>
> Les
>
> Leslie Watts
> L M Watts Furniture
> Tiger, Georgia USA
>

http://www.alltel.net/~leswatts/wattsfurniturewp.html

> engineering page:
> http://www.alltel.net/~leswatts/shop.html
>
> ----- Original Message -----
> From: "Kayla Sanders" <tattoos4unme@...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Wednesday, October 02, 2002 3:40 AM
> Subject: [CAD_CAM_EDM_DRO] mounting ballscrews onthe
> ol mini mill help
>
>
> > i have just recently purchased some warner
> electric 3/8 inch
> > ballscrews and nuts and am trying to figure out a
> way to mount them
> > in my mini mill without extensive mods to the
> mill(mainly because i
> > dont have anything else to machine it with!)
> >
> > im wondering if i absolutely have to use thrust
> bearings when i
> > mount them to the table or if i can use good
> quality precision
> > bearings ,if held firmly on both sides?
> > i mean, how much axial force is really going to be
> put on the
> > bearings with a mini mill anyway?
> > i ask this because finding thrust bearings to fit
> this ballscrew
> > after machining the ends down to 5/16ths or so is
> looking to be
> > impossible. i can find precision bearings all over
> the place that
> > would fit snuggly on the ends.
> > and i think that if i enclose the bearings just
> down to the
> > ballscrew with the motor mounting plate on both
> sides, that this
> > would work.
> >
> > any ideas or suggestions from you fellow CNC'ers
> or knowlegable
> > people out there??
> > thanks for the input if any.
> >
> > K.S.
> >
> >
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