Re: [CAD_CAM_EDM_DRO] Re: Ball screw/nut repair

For angular contact bearings for ball screw usage your best bet is to go
to the nearest city and find the bearing / industrial supply houses.
One outfit that covers most of the country would be Kaman Industrial
Technologies (www.kamandriect.com). There are of course many others
and a local supplier may offer better deals.

The things to consider are the bearings part number and manufacture. A
good bearing supplier should have reasonably good luck with just this
info. It never hurts to dimension the bearing before placing an order
and that info may be needed for really odd suppliers. Many times
though the part numbers cross to industry standard numbers. All of
this if they used standard angular contact bearings.

Some manufactures also make bearings designed especially for ball screw
use. These apparently designed to take thrusts better that the run of
the mill angular contact bearing. If your machine has these you will
want to make sure that you put in the same thing. It might also make
sense to upgrade if not.

If you need to look into this more check out the web sites of FAFNIR and
other companies. FAFNIR's web site sucks for navigation but I
successfully downloaded their catalogs the other day at work. Of
course there are about a billion other suppliers, but I'd suggest that
this is the one place where cutting corners never works out.

Best of luck
Dave


Polaraligned wrote:

>
> Express Ballscrew Repair quoted me $700 to $800 EACH and that
> was on the low side he said. I made it clear that the ballscrews
> were not crashed and that I had a couple of thousands backlash. I
> also told him that they were in a hobby machine and I did not need
> the typical rush turnaround service. But the guy really did not want
> to do it. He kept telling me that there were so many made that I
> probably could find NOS screws somewhere??? I passed.
> 3 other firms quoted me about $750 EACH for a regrind and reball.
> One guy wanted $200 just to reball them.
> Finally I found Esco Machine in Texas. The guy has been doing
> this for 30 years and knew the machine. He said he could
> give the ballscrew a light grind and reball for $700 for BOTH.
> What a difference. I am going to send mine out in a week or
> two and have him do my screws. :-)
>
> My angular contact bearings are worn and need replacing. Anyone
> know of a good source for this type of bearing?
>
> Scott
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com
> <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>, "Mark Vaughan" <mark@...>
> wrote:
> >
> > Can I ask what sort of price they charged.
> >
> > I have seen quotes to regrind Bridgeport ones at £400 to £800
> >
> > Always seemed a hell of a lot of money
> >
> > Always been lucky and had good screws on everything I've aquired.
> >
> > Regs Mark
> >
> >
> >
> > Dr. Mark Vaughan Ph'D. B.Eng. M0VAU
> >
> > Managing Director
> >
> > Vaughan Industries Ltd, reg in UK no 2561068
> >
> > Water Care Technology Ltd, reg in UK no 4129351
> >
> > Addr Unit3, Sydney House, Blackwater, Truro, Cornwall, TR4 8HH, UK.
> > Phone/Fax 44 1872 561288
> >
> > _____
> >
> > From: CAD_CAM_EDM_DRO@yahoogroups.com
> <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>
> > [mailto:CAD_CAM_EDM_DRO@yahoogroups.com
> <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>] On Behalf Of Mark Kenworthy
> > Sent: 04 February 2007 20:56
> > To: CAD_CAM_EDM_DRO@yahoogroups.com
> <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>
> > Subject: RE: [CAD_CAM_EDM_DRO] Re: Ball screw/nut repair
> >
> >
> >
> > That's good to check. I agree, with .008" of play, the thrust bearing(s)
> > are almost certainly bad.
> >
> > If you do need your ball screw reground, I've sent 4 ball screw
> assemblies
> > from my Fadal mills to Express Ball Screw Repair
> > (http://www.expressb <http://www.expressballscrewrepair.com
> <http://www.expressballscrewrepair.com>>
> > allscrewrepair.com), and had good results. You might
> > want to give them a try. It's not an inexpensive process, but much less
> > expensive than buying new ball screws (at least for the Fadal mills).
> >
> > Mark
> >
> > _____
> >
> > From: CAD_CAM_EDM_ <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>
> > DRO@yahoogroups.com <mailto:DRO%40yahoogroups.com>
> > [mailto:CAD_CAM_EDM_ <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>
> > DRO@yahoogroups.com <mailto:DRO%40yahoogroups.com>] On Behalf Of
> Vince Endter
> > Sent: Sunday, February 04, 2007 12:09 PM
> > To: CAD_CAM_EDM_ <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>
> > DRO@yahoogroups.com <mailto:DRO%40yahoogroups.com>
> > Subject: [CAD_CAM_EDM_DRO] Re: Ball screw/nut repair
> >
> > I forgot to check the angular contact bearing when I had it apart. I
> > will check that Monday.
> >
> > Vince
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
>
>