K. O. LEE B6062 - VII. Wheel R.p.M.; S.f.p.M. Chart

Instruction Manual Section Seven
VII. WHEEL R.P.M. / S.F.P.M. CHART
Table of Grinding Wheel Speeds
To find the number of revolutions of the wheel spindle, having been
given the surface or peripheral speed and the diameter of the wheel, divide
the surface speed in feet per minute by the circumference (diameter x 3.14)
in feet.
To find the surface speed of a wheel in feet per minute, multiply the
circumference in feet by the revolutions per minute.
Mm
(Approx.)
6
9
13
16
19
22
25
50
75
100
125
150
175
200
250
305
355
405
455
505
560
610
660
710
760
810
860
910
4000 Ft
1200 M
4500 Ft
1350 M
5000 Ft 5500 Ft 6000 Ft
1500 M 1650 M 1800 M
6500 Ft
1950 M
Revolutions per Minute
61,116
40,744
30,558
24,446
20,372
17,462
15,279
7,639
5,093
3,820
3,056
2,546
2,183
1,910
1,528
1,273
1,091
955
849
764
694
637
588
546
509
477
449
424
68,756
46,594
34,378
27,502
22,918
21,826
17,189
8,594
5,729
4,297
3,438
2,865
2,455
2,148
1,719
1,432
1,228
1,074
955
859
781
716
661
614
573
537
505
477
76,392
50,928
38,196
30,557
25,464
21,826
19,098
9,549
6,366
4,775
3,820
3,183
2,728
2,387
1,910
1,591
1,364
1,194
1,061
955
868
796
734
682
637
597
562
530
84,032
56,021
42,016
33,615
28,011
24,009
21,008
10,504
7,003
5,252
4,202
3,501
3,001
2,626
2,101
1,751
1,500
1,313
1,167
1,050
955
875
808
750
700
656
618
583
91,672
61,115
45,836
36,669
30,557
26,192
22,918
11,459
7,639
5,729
4,584
3,820
3,274
2,865
2,292
1,910
1,637
1,432
1,273
1,146
1,042
955
881
818
764
716
674
637
99,212
66,141
49,656
39,685
33,071
28,346
24,828
12,414
8,276
6,207
4,966
4,138
3,547
3,103
2,483
2,069
1,773
1,552
1,379
1,241
1,128
1,034
955
887
828
776
730
690
—109-
Diam. of
Wheel in
Inches
Peripheral Speed in Feet per Minute