Rockwell Automation 8520 9/Series CNC Lathe User Manual
Page 404
Spindles
Chapter 17
17-6
Important: If it is desirable to prevent the spindle speed from reaching a
maximum RPM a ceiling can be placed on the spindle speed at a rate
below the maximum AMP setting. For details, see the CSS notes on page
17-6.
Relationships between spindle speeds and cutting diameters are shown in
Table 17.A for different surface speeds.
Table 17.A
Spindle RPM as related to cutting diameter and programmed CSS
Programmed Surface Speed, Feet/min. (meters/min.)
100(30) 200(61) 300(91) 400(122)
500(152)
1000(305)
1500(457)
2000(610)
1(25)
382
764
1146
1527
1910
3820
5730
7640
2(51)
191
382
573
764
955
1910
2865
3820
3(76)
127
254
382
509
637
1273
1910
2546
4(102)
95
191
286
382
477
955
1432
1910
5(127)
76
153
229
306
382
764
1146
1528
Cutting
6(152)
64
127
191
255
382
637
955
1273
Diameter,
8(203)
47
95
143
191
239
477
716
955
Inches
10(254) 38
76
115
153
191
382
573
764
(mm)
12(305) 32
64
95
127
159
318
477
637
14(356) 27
55
82
109
163
273
409
546
16(406) 24
48
72
95
143
239
358
477
18(457) 21
42
64
85
127
212
318
424
20(508) 19
38
57
76
115
191
286
382
25(635) 15
31
46
61
92
153
229
306
30(762) 12
25
38
51
76
127
191
255
Notes on Constant Surface Speed
Normally the system installer sets a maximum speed in AMP; however,
the programmer has the option of lowering this maximum speed if
desired. An allowable upper limit for RPM can be programmed by a
G92 followed by an S value in RPM. This upper limit is valid only for
the G96 mode and is ignored in G97 mode. The value for this upper
limit can not exceed the value set in AMP for the maximum spindle
RPM.
To enter 3500 rpm as the upper limit, program:
G92S3500;