Re: Re: B/S vs. acme

In a message dated 6/28/2006 7:30:06 P.M. Central Daylight Time,
rogersmach@... writes:

So if someone building a linear CNC device has the choice between the two,
sometimes it's an "advantage" to use an ACME screw over a ballscrew? When?
Other than cost and availablitly, I can't think of any.


[One thing an acme screw won't do is unwind itself, dropping the Z-axis to
the table when the power's shut off. If you use a ballscrew for Z, and the
axis slide doesn't have much friction, it may require a brake to keep that
from happening.]

Andrew Werby
www.computersculpture.com