Re: [CAD_CAM_EDM_DRO] ball screw vs lead crew

Hi,

Ball-screws are important in the X and Y axis because they are designed for
as near zero backlash as possible. Machine tools fitted with high precision
ground ball-screws are also very accurate in the distance travelled. Due-to
the weight of the Z axis the slide is always pressing down so backlash isn't
a problem, except if you want to do a movement towards the tail-stock on a
lathe. The other consideration is the Z axis on a miller has to be locked to
maintain position when power is removed from the motors when using
ball-screws as there sometimes isn't enough friction and the slide will sag.
Much like my bits as I get older.

Regards,

Terry

>Hi,
>I have few questions to ask the group for help. Why do we only use ball

screws for X and Y axis and for Z we use lead screw? >Are there ways that we
can use ball screws for all three axis? I have read many threads at
Cnczone.com on this subject but I still >need help. Could some one help me?
Thanks