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VARIABLE HELIX END MILLS SPEEDS AND FEEDS – 4-FLUTE TOOLS

	CUTTER DIAMETERS
	Bhn	1/4		5/16		3/8		7/16		1/2		9/16		5/8		3/4		1
MATERIAL		RPM	in/min	RPM	in/min	RPM	in/min	RPM	in/min	RPM	in/min	RPM	in/min	RPM	in/min	RPM	in/min	RPM	in/min
Cast Iron Ductile	~300	3670	11	2930	14	2450	18	2100	18	1840	17	1630	16	1470	15	1220	14	920	12
Cast Iron Grey	~200	7250	23	5800	27	4839	36	4150	35	3630	34	3230	32	2900	31	2420	29	1815	24
Cast Iron Malleable	~300	2300	7	1840	8	1230	11	1310	11	1150	11	1020	10	920	9	765	9	575	7
Inconel Waspoloy High Temp	~300	1225	3	980	4	820	6	700	6	615	6	545	6	490	5	410	5	310	4
Low Carbon Steels	~175	7800	24	6235	29	5200	39	4450	38	3900	37	3470	35	3120	33	2600	31	1950	25
Low Carbon Steels	~275	6420	20	5140	24	4580	32	3670	31	3210	30	2850	29	2570	27	2140	25	1604	21
Medium Allloy Steels	~275	5350	17	4280	20	3565	27	3060	26	2680	25	2380	24	2140	23	1785	21	1340	17
Mold Steels	~275	2750	8	2200	10	1840	13	1575	13	1380	13	1220	12	1100	11	920	11	690	9
Stainless 300 Series	~275	4585	14	3680	17	3060	23	2620	23	2290	22	2040	20	1835	19	1530	18	1150	15
Stainless 400 Series	~185	6420	20	5150	24	4280	32	3670	31	3210	30	2850	29	2570	27	2140	25	1605	21
Stainless PH Series	~325	3820	12	3060	14	2650	19	2190	19	1910	18	1700	17	1530	16	1275	15	960	12
Titanium Alloys*	~295	2500	8	2000	10	1900	14	1700	15	1400	14	1300	13	1100	11	980	11	700	9

Above speeds and feeds are starting parameters. 1XD full slot or 1.5XD at 50% radial engagement. Rigid setup.
*For titanium machining in a vertical mill 1,000 PSI thru coolant is recommended.
For high efficiency milling 10% step over, multiply RPM x 1.4 and multiply feed x 2.0.
For high efficiency milling 5% step over, multiply RPM x 2.5 and multiply feed x 2.5.
For high efficiency milling 4% step over, multiply RPM x 3 and multiply feed x 3.

VARIABLE HELIX END MILLS SPEEDS AND FEEDS – 5-FLUTE TOOLS

	Bhn	1/4		5/16		3/8		7/16		1/2		9/16		5/8		3/4		1
MATERIAL		RPM	in/min	RPM	in/min	RPM	in/min	RPM	in/min	RPM	in/min	RPM	in/min	RPM	in/min	RPM	in/min	RPM	in/min
Cast Iron Ductile	~300	3670	14	2930	17	2450	22	2730	22	1840	20	1630	19	1470	18	1220	17	920	14
Cast Iron Grey	~200	7250	29	5800	33	4839	43	4150	42	3630	40	3230	38	2900	37	2420	35	1815	29
Cast Iron Malleable	~300	2300	9	1840	10	1230	13	1310	13	1150	13	1020	12	920	11	765	11	575	9
Inconel Waspoloy High Temp	~300	1225	4	980	5	820	7	700	7	615	7	545	7	490	6	410	6	310	5
Low Carbon Steels	~175	7800	30	6235	35	5200	47	4450	45	3900	44	3470	42	3120	40	2600	37	1950	30
Low Carbon Steels	~275	6420	25	5140	29	4580	39	3670	37	3210	36	2850	34	2570	32	2140	30	1604	25
Medium Allloy Steels	~275	5350	21	4280	24	3565	33	3060	31	2680	30	2380	29	2140	28	1785	25	1340	20
Mold Steels	~275	2750	10	2200	12	1840	16	1575	15	1380	15	1220	14	1100	13	920	13	690	11
Stainless 300 Series	~275	4585	18	3680	21	3060	28	2620	27	2290	26	2040	24	1835	23	1530	21	1150	18
Stainless 400 Series	~185	6420	25	5150	29	4280	38	3670	37	3210	36	2850	35	2570	33	2140	30	1605	25
Stainless PH Series	~325	3820	15	3060	17	2650	22	2190	22	1910	21	1700	20	1530	19	1275	18	960	14
Titanium Alloys*	~295	2500	10	2000	12	1900	16	1700	17	1400	16	1300	15	1100	13	980	13	700	11

Above speeds and feeds are for 5 flute tools in a rigid setup. 30 to 50% radial engagement up to 2XD.
*For titanium machining in a vertical mill 1,000 PSI thru coolant is recommended.
For high efficiency milling 10% step over, multiply RPM x 1.4 and multiply feed x 2.0.
For high efficiency milling 5% step over, multiply RPM x 2.5 and multiply feed x 2.5.
For high efficiency milling 4% step over, multiply RPM x 3 and multiply feed x 3.

VARIABLE HELIX END MILLS SPEEDS AND FEEDS – 6&7-FLUTE TOOLS

	CUTTER DIAMETERS
	Bhn	1/4		5/16		3/8		7/16		1/2		9/16		5/8		3/4		1
MATERIAL		RPM	in/min	RPM	in/min	RPM	in/min	RPM	in/min	RPM	in/min	RPM	in/min	RPM	in/min	RPM	in/min	RPM	in/min
Cast Iron Ductile	~300	4771	21	3809	26	3185	33	3549	33	1840	30	2119	29	1911	27	1586	26	1196	21
Cast Iron Grey	~200	9425	44	7540	50	6291	65	5395	63	1840	60	4199	57	3770	56	3146	53	2360	44
Cast Iron Malleable	~300	2990	14	2392	15	1599	20	1703	20	1840	20	1326	18	1196	17	995	17	748	14
Inconel Waspoloy High Temp	~300	1593	6	1274	8	1066	11	910	11	1840	11	709	11	637	9	533	9	403	8
Low Carbon Steels	~175	10140	45	8106	53	6760	71	5785	68	1840	66	4511	63	4056	60	3380	56	2535	45
Low Carbon Steels	~275	8346	38	6682	44	5954	59	4771	56	1840	54	3705	51	3341	48	2782	45	2085	38
Medium Allloy Steels	~275	6955	32	5564	36	4635	50	3978	47	1840	45	3094	44	2782	42	2321	38	1742	30
Mold Steels	~275	3575	15	2860	18	2392	24	2048	23	1840	23	1586	21	1430	20	1196	20	897	17
Stainless 300 Series	~275	5961	27	4784	32	3978	42	3406	41	1840	39	2652	36	2386	35	1989	32	1495	27
Stainless 400 Series	~185	8346	38	6695	44	5564	57	4771	56	1840	54	3705	53	3341	50	2782	45	2087	38
Stainless PH Series	~325	4966	23	3978	26	3445	33	2847	33	1840	32	2210	30	1989	29	1658	27	1248	21
Titanium Alloys*	~295	3250	15	2600	18	2470	24	2210	26	1840	24	1690	23	1430	20	1274	20	910	17

Above speeds and feeds are for 6 & 7 flute tools in a rigid setup. 15-20% radial engagement up to 2XD.
*For titanium machining in a vertical mill 1,000 PSI thru coolant is recommended.
For 9 flute tools max radial 15-20%. For 3XD and 4XD cuts 10% max radial multiply above feed rates by 20%.

HIGH EFFICIENCY MACHINING (HEM) – UP TO 4XD – 5% RADIAL ENGAGEMENT

	CUTTER DIAMETERS
	Bhn	1/4		3/8		1/2		5/8		3/4
MATERIAL		RPM	in/min	RPM	in/min	RPM	in/min	RPM	in/min	RPM	in/min
Cast Iron Ductile	~300	9175	41	6125	78	4600	75	3675	84	2300	78
Cast Iron Grey	~200	18125	86	12098	158	9075	149	7250	174	4538	163
Cast Iron Malleable	~300	5750	26	3075	49	2875	48	2300	51	1438	50
Inconel Waspoloy High Temp	~300	3063	11	2050	26	1538	26	1225	28	775	28
Low Carbon Steels	~175	19500	90	13000	170	9750	162	7800	185	4875	175
Low Carbon Steels	~275	16050	75	11450	140	8025	131	6425	152	4010	140
Medium Allloy Steels	~275	13375	64	8913	118	6700	109	5350	129	3350	120
Mold Steels	~275	6875	30	4600	57	3450	57	2750	62	1725	62
Stainless 300 Series	~275	11463	53	7650	100	5725	96	4588	107	2875	102
Stainless 400 Series	~185	16050	75	10700	140	8025	131	6425	151	4013	140
Stainless PH Series	~325	9550	45	6625	83	4775	80	3825	90	2400	84
Titanium Alloys*	~295	6250	30	4750	61	3500	61	2750	62	1750	61

*For titanium machining in a vertical mill 1,000 PSI thru coolant is recommended.
1/4 = 6 FL. 3/8 & 1/2 = 7 FL. 5/8 & 3/4 = 9 FL.