Dredging up a slightly old thread, but rather than start a new one...
I'm in the design/planning stages of CNCing a Sieg X3 mill and will be
using ball screws. At this point, I am planning to use Nook XPR screws
as they have a lead error of .001 in/ft. The main reason being is that
I do not have an accurate method (that I know of) to map a less accurate
screw for error compensation in EMC2. If I did, I would likely be
looking at Roton screws at .004 in/ft error. Regardless of the screws,
I'll be using double nuts to adjust out the backlash.
Does anyone know of a "home shop" class method to map a screw? Perhaps
using a dial indicator and moving along an inch at a time. That sounds
a bit tedious and prone to mistakes, but it's the only thing I can come
up with off the top of my head.
Also, I'm assuming EMC2's screw compensation interpolates between data
points in the compensation file. Can anyone confirm this? If so, is it
just a simple linear interpolation?
Thanks,
Stan
Chris Radek wrote:
On Thu, Jan 17, 2008 at 01:27:02PM -0600, Witek GB wrote:
I want to add an EMC CNC controller to my bridgeport clone however, before I
start, I was thinking of retrofitting and installing ball screws. I think I
have too much backlash in what I have now. I have a taiwanese 10" x 50"
bridgeport cone with a M cast into the main casting. So who sells zero
backlash ball scres that are atleast as accruate as +/- 0.0005/Ft and how
much would the setup cost me if I wanted to put it on my mill?
Thanks
WGB
Low backlash is critical for good operation on a CNC, but if you are
using EMC2 and have a way to measure it, the accuracy of the screw
doesn't matter much since you can use screw compensation.
Chris
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