Beijing Starfire Control Technology Co.,Ltd.
北京斯达峰控制技术有限公司
Model SF-2012AH-QG
Cutting Machine
（
C002
）
18
7.2.2. System parameters
In the SETUPsubmenu, press [F2] key to enter system parameters setting window, as shown in Fig. 7.3.
Numerator/denominator ratio of electronic gear----
The numerator/denominator ratio of electronic gear is pulse equivalency in
micron.
Numerator < 65535, denominator < 65535.
Example: if the pulse equivalency of system is 0.008mm, its numerator/denominator ratio of electronic gear = 8/1.
Electronic GearRatio
= Pitch of Screw Rod × 1000(360 × Subdivision Number / SteppingAngle × Drive Ratio)
The computation method(adjustment method) of electronic gear is as follows:
（
1
）
Firstly, assume an electronic gear ratio, e.,g., 8:1.
（
2
）
Control the machine to move a reference distance(the longer, the more accurate). Measure the actual travel distance and take
the measured value into the following formula:
Numerator XActual Travel Distance
Simplify the above formula to a fraction in lowest terms.
E.,g.,
assume the electronic gear ratio is 8:1 and the theoretical travel distance is 2000mm and the actual travel distance is 2651
mm.
8 X 2651
2651
Mechanical origin ----
A special point on the machine set with proximity switch. If mechanical origin is not to be used, set it to
zero. Unit: mm(or inch)
Reference point ----
It is defined as the machining origin of program and established automatically when a program is run(G92).
Unit: mm(or inch).
DRILLOFFSETS ----
Torch offset for drilling or scribing torch.
Reverse backlash
----Due to reverse mechanical backlash, the system will compensate the backlash at direction change. The backlash
value is obtained by actual measurement in mm or inch.
Generally, reverse backlash is not recommended.
Fig. 7.3 System parameters setting
Denominator X Theoretical Travel Distance
1 X 2000
250
=
SETUP main menu
Parameters
display zone
ESC key
Parameter
setting range
