Re: [CAD_CAM_EDM_DRO] Splicing Ballscrews

In a message dated 7/4/2006 3:08:38 P.M. Central Daylight Time,
vrsculptor@... writes:

I have two identical ground 1.5 inch 48 inch long ballscrews and zero
backlash nuts that I would like to make a single 96" for the long axis on a
router.<<
Even if your workmanship is virtually perfect, the "joint" is a weak point
in the 8' long screw, and, unless you will be turning this long one no more
than, oh, 100 RPM, the "whipping" will quickly loosen-up this joint to the
point the machine will fail. I did a machine with screws that long, and I was
curious about all the "math" and caveats in the ball-screw catalog, as I had
never done anything with screws longer than 4' before. But after that job was
done, I can TELL ya: FORGET abowdit! Just BUY yourself a long screw, and
save the two short ones for another axis, or a smaller machine, elsewhere!
Jan Rowland





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