Re: 1720XMTC shoptask z axis Ballscrews

So the rod that the ballnut screws into passes through a brass bushing in the flang?

Hmm-I am wondering if I could do something similar, but instead of teh brass bushing with the needle thrust bearings top & bottom, use a dual-row angular-contact ball bearing for the nut/rod to pass through the flange?

Andy

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "jimmy_staton" <olecoot@...> wrote:
>
> Ok, with Dan's help I have talked to Chuck and also acquired one of the Z-Axis rigs that
> Chuck built before moving. I'll post some information but it will only make sense if you
> reference the photos listed under Chuck McGhee (Shoptask) in the photo section.
>
> Photo link:
> http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/photos/album/1886719219/pic/1656316055/view?picmode=&mode=tn&order=ordinal&start=1&count=20&dir=asc
>
> reference photo listed as "Driven ball-nut closeup"
> Chuck used a piece of 1"x2" approx. round stock, drilled for the ball-screw to pass through. He then drilled and tapped one end of the rod to 7/8 x 16 for the ball-nut to screw into. He bored the 42 tooth XL pulley on top to a 1" light press fit. Pressed the shaft and pulley together and used the set screw to hold it in place. Between the pulley and 1" collar on bottom are 1" ID needle roller bearings and washers.
> The assembly "pulley and rod" are slipped through the aluminum angle which has (brass bushing in the hole) bearing on both sides collar slipped over the other end and
> the ball-nut is used to preload the assembly then the 1" collar is tightened.
>
> Hope this make some.
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "jimmy_staton" <olecoot@> wrote:
> >
> > I have an old Shoptask 1720XMTC that I'm converting to CNC I have the X & Y axis
> > mostly done.
> >
> > At one time I saw a guy Ex. Boeing Machines (Chuck) maybe; he's on the Shoptask
> > site under projects, that had converted the Z axis to a ballscrew feed using 2 ballscrews to eliminate that horrible z axis setup feed. Would anyone have anymore information on how he did it.
> >
> > I realize I'm reaching but I've searched all over try to find more information on how it was done.
> >
> > Thanks
> > Jimmy
> >
>