Siemens SINUMERIK 840C User Manual
Page 243
6 NC Machine Data (NC MD), NC Setting Data (NC SD)
12.93
6.4 Axis-specific MD 1 (axial data 1)
m =
360 degrees
4pf
•
A rotary axis is used:
•
The ROD encoder is mounted onto the motor and the gearing is located between the
motor and the leadscrew:
m =
× r
I
4p
Example 2: Same values as above, except b = 0.5 × 10
-3
mm; K = 25.4
=
m
b
MD368* =;
MD364* =;
Example 1: I = 0.2 inch; p = 1000; b = 2 × 10
-5
inch; r = 1:2 (i.e. 2 motor revolutions
for 1 leadscrew revolution);
inch = 10
-4
inch
=
m
b
MD368* = 5;
MD364* = 1;
m =
0.2 Ч 2
4 Ч 1000
K × 10
-6
inch
0.5 × 10
-3
mm
=
5.08
1
mm
inch
ˆ
=
=
Example:
p = 18000; f = 5; b = 0.5 × 10
-3
degrees;
m =
= 0.001 degrees
360 degrees
18000 Ч 5 Ч 4
=
v
u
m
b
1 × 10
-3
degr.
0.5 × 10
-3
degr.
=
•
A linear scale with EXE is used:
m =
g
4f
Example:
g = 0.02 mm; f = 10; b = 0.5 × 10
-3
mm;
m =
= 0.0005 mm
MD368* = 1;
MD364* = 1;
0.02 mm
40
0.5 × 10
-3
mm
0.5 × 10
-3
mm
=
v
u
m
b
=
1
1
Calculation factor inch
mm
=
10
-4
inch
2 × 10
-5
inch
=
10
2
5
1
=
10
2
=
v
u
=
v
u
=
2
1
Should either of the values be greater than 100 000, both values must be divided by the same
divisor (e.g. one exponent of 10).
Recommendation: Reduce whenever possible
6–58
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Siemens AG 1992 All Rights Reserved 6FC5197- AA50
SINUMERIK 840C (IA)