Re: Ball screws

--- In CAD_CAM_EDM_DRO@y..., allan_r9@h... wrote:
> Hello,
>
> I too am shopping for ball screws to convert my GEM500 to CNC, so
I'm
> interested in the same answers you get. I did convert an Enco
> Mill/Drill (2HP version) to 3 axis CNC using Kerk Motion Products
> zero backlash nuts and screws (not ball screws). I wish I had gone
> for the ball screws now. I have all the pertinent components
> modelled in 3D solids. If you would like the file, let me know what
> solids format you can use. The Mill/Drill started with Ah-ha
control
> and Gecko G201 drives with 3 Sanyo-Denki 720oz/in motors, then I
> bought the BDI disk from Paul at the NAMES 2001 show, and got the
EMC
> control working. It runs much smoother than the Ah-ha control.
The
> EMC system will be used for the GEM500 conversion which will be a 5
> axis machine. The 3d model for this machine with 5 axis trunnion
> will be placed on the files list soon.
>
> Allan
>
> --- In CAD_CAM_EDM_DRO@y..., tbrooking@s... wrote:
> > I am new to this group and have found it very informative. I
have
> > some questions about using ball screws on a Enco style mill
drill.
> > My intention is eventually convert it to cnc. First, of the
people
> > who have replaced lead screws with ball screws on a mill drill,
> what
> > size, lead, and grade of screw did you select and why? Did you
> > calculate the maximum axial load the screw would be subject to
> during
> > milling or drilling? Where did you get the ball screws from and
> how
> > much were they (US dollars)? Was there any modifications you
made
> to
> > the machine to allow you to fit and use ball screws? All input
on
> > this subject as well as converting a mill drill to cnc will be
> > greatly appreciated.