Surface Feet per Minute (SFM) to Revolutions Per Minute (RPM)

Cutter Diameter / RPM

SFM	1/8	1/4	3/8	1/2	5/8	3/4
50	1528	764	509	382	306	254
100	3056	1528	1018	764	612	508
150	4584	2292	1527	1146	918	762
200	6112	3056	2036	1528	1224	1016
250	7638	3820	2546	1910	1528	1273
300	9166	4584	3056	2292	1834	1528
350	10694	5348	3565	2675	2139	1783
400	12221	6112	4074	3057	2445	2038
450	13749	6875	4584	3439	2751	2292
500	15277	7639	5093	3821	3057	2547
600	18332	9167	6111	4584	3667	3057
700	21387	10695	7130	5348	4278	3565
800	24442	12223	8148	6112	4889	4074
900	27498	13751	9167	6875	5501	4584
1000	30553	15278	10185	7639	6111	5093
	FORMULA:		SFM = (3.1416 x Diameter x RPM) / 12
			RPM = (12 x SFM) / (3.1416 x Diameter)

Meters per Minute (m/min) to Revolutions Per Minute (RPM)

m/mn	3mm	6mm	10mm	12mm	16mm	18mm
10	1060	530	320	265	200	175
20	2120	1060	630	530	400	350
40	4140	2120	1270	1060	795	710
60	6360	3180	1900	1590	1190	1060
80	8490	4240	2540	2120	1590	1410
100	10600	5300	3180	2650	1990	1770
150	15910	7950	4770	3980	2980	3650
200	21210	10600	6360	5300	3980	3530
250	26520	13260	7950	6630	4970	4420
300	31820	15910	9550	7950	5970	5300
350	37130	18560	11140	9280	6960	6190
400	42430	21210	12730	10610	7960	7070
450	47740	23820	14320	11930	8950	7960
500	53040	26520	15910	13260	9940	8840
550	58350	29170	17500	14590	10940	9720
600	63650	31820	19090	15910	11930	10610
	FORMULA:		m/min = (3.1416 x Diameter x RPM) / 1000
			RPM = (1000 x m/min) / (3.1415 x Diameter)

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