Re: setting up the CNC mill

Hi Boris!

Well, I double-checked this program on my own machine, and I can
say it probably isn't the software. The suggestions made by the
other folks are good ones. Try this for example and see if it
changes things on your end:

G01 X+1
G04 #1 ;short dwell
G01 X-1

TurboCNC doesn't take very long to process these one axis moves, so
when you have a sudden reverse like this it can "jolt" when it
changes direction.

At .01 mm (4 tenths), I'd say anything's possible. If I understand
your post correctly, you built the entire mill? Impressive.

Dave Kowalczyk
Seattle WA
website --> http://www.dakeng.com

--- In CAD_CAM_EDM_DRO@y..., Boris Mara¾ <boris.maraz@p...> wrote:
> A few weeks ago I built a hobby CNC mill from some sort of
plastics. And fixing up steppers, controllers and start using
TURBOCNC program which is running very good.
>
> Because I don't have a scale micrometer to measure backlash, I
built a simple 'instrument' to only show me backlash, not to measure
it. It works well.
>
> And I set appropriate value for backlash with this program
>
> G91
> G01 X+1
> G01 X-1
> M00 Set zero on my 'instrument'.
> G01 X-1
> G01 X+1
> G90
> M02 Get backlash with the smallest manual (jog) step in +
direction until the 'instrument' show the zero and then read from
program value of X axis
>
> But I have a problem with repeating functions, which I can't
resolve.
> If the program makes G01 X-1 and then G01 X+1 twenty times, with
each move the mill go for more then 0.01mm in positive direction on X
axis.
>
> Then I change program to get other direction backlash. I only
change - to + and + to -.
> And the values are different from previous values.
>
> It is possible that the machine have different backlash for - and +
direction on the same axis?
> How to correct this differences?
>
> Boris
>
>
>
>
>
> [Non-text portions of this message have been removed]