Re: flexible couplings for PCB router

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Graham Stabler" <eexgs@...>
wrote:

>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, juan gelt <juangelt@> wrote:
> >
> > http://www.cnc-g-spot.com/CNCtaig/ThustBearings/ThrustBearings.HTM
> >
> > best i can do for now, sorry
> >
>
> Nice, the proxxon mill as standard uses a sleeve and some washers to
> form thrust bearings, that seems to work well. I was having some
> problems with lost steps with my machine one weekend so swapped them
> out for normal radial ball bearings, I am told they can take an axial
> load of half the radial rating and the radial is massive. They work
> really well, all I did was swap the washer setup for the bearings and
> hold the bearings in place with a little epoxy, there is one at each
> end of the screw. These bearings are also very cheap so if you want
> balls you can save a lot over thrust bearings proper.
>
> The problem? Well that actually turned out to be my laptop burping out
> the step pulses when running turboCNC, changed laptop and problem
> disappeared. Oh well at least the machine got oiled.
>
> Graham

Many a small unit will use two skate bearings on one end of a screw
and by tightening the nuts on the screw, it will preload the bearings
and create a cheap type of thrust bearing with no axial play.


But, they are used on lightly loaded machines. The next step up is
the angular contact bearings. But that is a step up in price as well.

I think I paid about 50 cents or less for skate bearings and $10.00
for a pair of angular contact bearings. VXB.COM

Dave

>