SPACE 2000 EVO/N (T and M versions) OPERATION MANUAL
23
LINEAR CORRECTION
The machining errors which can be originated by geometrical defects of the machine tool
due to wear or to a lack of linearity of the guides, coupling clearances between the
Carriage and the guide, badly distributed weights, and so on may even be considerable. If
the errors are of the linear type, that is to say if they are proportional to the value of the
displacement carried out, they can be offset by means of the linear correction function,
The correction factor
CF
can be calculated by the operator using the following relationship:
MEASURED DIMENSION (measured with accuracy)
CF = -------------------------------
RATED DIMENSION (according to the drawing)
Let us suppose that a machining operation has been carried out displacing the X Axis by
400.00 mm (reading on the X-Axis display) but that a machining error (either positive or
negative) has been found. For example, when measured, the work piece was found to be
either longer or shorter than intended. That means:
A) 400.20 mm
the work piece is longer, with an error of 200
µ
m
B) 399.88 mm
the work piece is shorter, with an error of 120
µ
m
in case
A
we will have
400.20 : 400.00 = 1.0005
(CF)
in case
B
we will have
399.88 : 400.00 = 0.9997
(CF)
To offset these errors:
Key
30
1. 0 0 0 0 0 0
X
To enter the correction factor for X Axis:
Key
1.0005
1. 0 0 0 5 0 0
X
or Key
0.9997
0. 9 9 9 7 0 0
X
All the displacements we carry out along the X Axis will be offset by the
CF
factor which
has been entered. Then consider the remaining Axes, either confirming them by pressing
EXE, or proceeding as above to activate them for the function. On completion, all the
displays will be enabled for the counting.
As an alternative, it is possible to make the movement and manually insert the real value
of it; that way the value of CF will be automatically calculated by the device by use of F31
function with only one segment (not linear correction
– 10 points)
THE LINEAR CORRECTION FUNCTION HAS THE FOLLOWING FEATURES :
1.
IT IS STORED PERMANENTLY (IT BECOMES A MECHANICAL COMPONENT OF THE AXIS WHICH HAS BEEN ACTIVATED).
2.
IT CAN ALWAYS BE MODIFIED FOR EACH SINGLE AXIS, BY ENTERING DIFFERENT
CF
VALUES.
3.
IT CAN BE DE-ACTIVATED, RETURNING TO THE TRUE DISPLACEMENT VALUE, BY ENTERING THE VALUE OF
CF = 1
OR BY CANCELLING THE SCALE FACTOR WITH THE FUNCTION
F 0
(NO CORRECTION ENTERED, SEE PAGE 15).
4.
IT CAN AFFECT ONE OR MORE AXES WITH THE SAME
CF
OR A DIFFERENT ONE FOR EACH AXIS.
5.
IT HAS PRIORITY OVER THE OTHER FUNCTIONS SUCH AS PRE-SET, RESET, ORIGINS, SCALE FACTOR, ETC...
THE CORRECTION MUST BE ENTERED BEFORE THE OTHER FUNCTIONS (WHICH OTHERWISE
WOULD BE MODIFIED).
