Newson Tool Services - Finishing End Mill Feed And Speed Selector

Table feeds must be varied according to conditions regarding:
• Rigidity of machine;
• Character of cut to be taken;
• Power;
• Style and strength of cutters, and;
• Shape and size of work.

Instructions:

Step 1: Locate Surface Feet per Minute (SFM) and Feet Per Tooth (FPT) for material (Table A).

Step 2: Find RPM at intersection of Surface Feet per Minute (SFM) line and diameter column (Table B).

Step 3: Locate nearest Revolutions Per Minute (RPM), read down to Feet Per Tooth (FPT) (Table C).

Then read Inches Per Minute (IPM) opposite number of teeth.

Explanation of symbols:

SFM: Surface Feet per Minute
RPM: Revolutions Per Minute
FPT: Feet Per Tooth
IPM: Inches Per Minute

Speeds may be increased when using:
• Titanium Nitride Coated +25 percent: Roughing End Mills: Increase 20 percent.
• Super Premium +20 percent: Deep Slotting: Reduce 50 percent.
• Roughing End Mills + 15 percent: Slotting: Reduce 20 percent.

Table A
			S F P M

Material To Be Cut	Feed Per Tooth 1/4 Inch End Mill	Feed Per Tooth End Mill Upward of 1 Inch	Roughing	Condition	Finishing
Aluminum Micarta Magnesium Bronze Medium Bronze Hard Plastic, Glass Filled Cast Iron, Soft Cast Iron, Hard Steel, Low Carbon Steel, 4140 Steel, 4340 Steel, Stainless, 304 Steel, Stainless 17-4PH Steel, D6AC Inconel Monel-K Titanium 6AL-4V Nickel Zinc Die Castings	0.003 0.004 0.004 0.003 0.002 0.003 0.003 0.002 0.001 0.0005 0.0003 0.001 0.0005 0.0002 0.0002 0.0003 0.002 0.0002 0.002	0.009 0.010 0.010 0.007 0.005 0.012 0.008 0.005 0.004 0.003 0.002 0.004 0.003 0.002 0.003 0.004 0.004 0.002 0.010	600 800 800 250 125 150 60 50 75 50 50 55 35 40 30 60 25 60 800	800 1000 1000 300 150 160 80 70 90 70 70 75 50 70 40 80 40 80 1000	132 Bhn 100 Bhn 97 Bhn 180 Bhn 170 Bhn 240 Bhn 200 Bhn 350 Bhn 350 Bhn 250 Bhn 350 Bhn 350 Bhn 300 Bhn 285 Bhn 310 Bhn 280 Bhn 100 Bhn

Table B

Surface Feet Per Minute	20	30	40	50	60	70	80	90	100	125	150	200	300	400	500	600	800	1000
Diameter In Inches	Revolutions Per Minute Selector
1/16 1/8 3/16 1/4 5/16 3/8 7/16 1/2 5/8 3/4 7/8 1 1-1/8 1-1/4 1-3/8 1-1/2 1-5/8 1-3/4 1-7/8 2 2-1/2	122 611 407 306 244 204 175 153 122 102 87 76 68 61 56 51 47 44 41 38 31	1833 917 611 458 367 306 262 229 183 153 131 115 102 92 83 76 71 66 61 57 46	2445 1222 815 611 489 407 349 306 244 204 175 153 136 122 111 102 94 87 82 76 61	3056 1528 1019 764 611 509 437 382 306 255 218 191 170 153 139 127 118 109 102 96 76	3667 1833 1222 917 733 611 524 458 367 306 262 229 204 183 167 153 141 131 122 115 92	4278 2139 1426 1070 856 713 611 535 428 357 306 267 238 214 194 178 165 153 143 134 107	4889 2445 1630 1222 978 815 698 611 489 407 349 306 272 244 222 204 188 175 163 153 122	5500 2750 1833 1375 1100 917 786 688 550 458 393 344 306 275 250 229 212 196 183 172 138	6112 3056 2037 1528 1222 1019 873 764 611 509 437 382 340 306 278 255 235 218 204 191 153	7639 3820 2546 1910 1528 1273 1091 955 764 637 546 477 424 382 347 318 294 273 255 239 181	9167 4584 3056 2292 1833 1528 1310 1146 917 764 655 573 509 458 417 382 353 327 306 286 229	6112 4074 3056 2445 2037 1746 1528 1222 1019 873 764 679 611 556 509 470 437 407 382 306	9167 6112 4584 3667 3056 2619 2292 1833 1528 1310 1146 1019 917 833 764 705 655 611 573 458	8149 6112 4889 4074 3492 3056 2445 2037 1746 1528 1358 1222 1111 1019 940 873 815 764 611	7639 6112 5093 4365 3820 3056 2546 2183 1910 1698 1528 1389 1273 1175 1091 1019 955 764	9167 7334 6112 5238 4584 3667 3056 2619 2292 2037 1833 1667 1528 1410 1310 1222 1146 917	9778 8149 6985 6112 4889 4074 3492 3056 2716 2445 2222 2037 1880 1746 1630 1528 1222	8731 7639 6112 5093 4365 3820 3395 3056 2778 2546 2351 2183 2037 1910 1528

Table C

RPM FPT	Teeth	IPM 50	IPM 75	IPM 112	IPM 170	IPM 250	IPM 375	IPM 570	IPM 850	IPM 1280	IPM 2000	IPM 2900	IPM 4300
0.0005 0.001 0.0015 0.002 0.003 0.005 0.008	2 4 6 2 4 6 2 4 6 2 4 6 2 4 6 2 4 6 2 4 6	0.05 0.10 0.15 0.10 0.20 0.30 0.15 0.30 0.45 0.20 0.40 0.60 0.30 0.60 0.90 0.50 1.00 1.50 0.80 1.60 2.40	0.075 0.15 0.22 0.15 0.30 0.45 0.22 0.44 0.67 0.30 0.65 0.97 0.45 0.90 1.30 0.75 1.50 2.20 1.20 2.40 3.60	0.11 0.22 0.33 0.22 0.44 0.66 0.33 0.66 1.00 0.45 0.90 1.30 0.70 1.30 2.00 1.10 2.20 3.30 1.80 3.60 5.30	0.17 0.34 0.50 0.34 0.68 1.00 0.50 1.00 1.50 0.68 1.34 2.00 1.00 2.00 3.00 1.70 3.40 5.10 2.70 5.40 8.10	0.25 0.50 0.75 0.50 1.00 1.50 0.75 1.50 2.20 1.00 2.00 3.00 1.50 3.00 4.50 2.50 5.00 7.50 4.00 8.00 12.00	0.37 0.54 1.10 0.75 1.50 2.20 1.10 2.20 3.30 1.50 3.00 4.50 2.20 4.40 6.60 3.70 7.40 11.00 6.00 12.00 18.00	0.57 1.10 1.70 1.10 2.20 3.30 1.70 3.40 5.00 2.20 4.40 6.60 3.40 6.80 10.00 5.70 11.00 17.00 9.00 18.00 27.00	0.85 1.70 2.50 1.70 3.40 5.10 2.50 5.00 7.60 3.40 6.80 10.00 5.10 10.20 15.00 8.50 17.00 25.00 13.60 27.20 41.00	1.30 2.60 3.90 2.50 5.00 7.50 3.80 7.60 11.00 5.00 10.00 15.00 7.70 15.00 23.00 13.00 26.00 39.00 20.00 40.00 60.00	2.00 4.00 6.00 4.00 8.00 12.00 6.00 12.00 18.00 8.00 16.00 24.00 12.00 24.00 36.00 20.00 40.00 60.00 32.00 64.00 96.00	2.90 5.80 8.70 5.80 11.60 17.40 8.70 17.40 26.00 11.60 23.00 35.00 17.40 34.80 52.00 29.00 58.00 87.00 46.00 92.00 139.00	4.30 8.60 13.00 8.60 17.20 26.00 13.00 26.00 38.00 17.00 34.00 51.00 26.00 52.00 77.00 43.00 86.00 130.00 68.00 137.00 206.00

The feed and speed rates should be used as a guideline. Adjustments may be required to suit individual job requirements.

1. Select SFM (Surface Feet Per Minute_ from Machinability Rating Table.

2. Convert to RPM by Selecting Machinability Rating and multiply this figure by SFM then by 3.8 then divide by cutter diameter.

For example:

M.R. (0.55) X SFM (90) X 3.8 / 2 (sample cutter diameter) = RPM

(Calculate actual RPM) = 188.11 / 2 = 94.05 RPM

3. Feed: The proper feed rate will vary with the amount of stock being removed, but generally should not exceed 0.004 inches per flute per revolution. To obtain feed rates, multiply RPM by Number Of Flutes then by feed per flute.

For example:

94.05 X 8 X 0.004 = 3.0096 Per Minute. (Refer above to Figure A).

4. Cutting Fluid: Always use a full flood of coolant to reduce temperature and flush chips.


Machinability Rating Table

Material	Surface Feet Per Minute	Machinability Rating
1020 1020 1030 1040 1050 1095 (annealed) 1108 1112 1117 1137 1140 1141 1144 1213 1215 4023 4037 4047 4130 4140 4340 4620 4640 5120 52100 6118 6150 8620 8630 8655 8720 9260 Cast Iron (S) Cast Iron (M) Cast Iron (H) Inconel X Inconel 901 17-4-PH 17-7-PH K Monel R Monel 302 303 304 310 316 321 347 410 416 420 430 430F 440C 440F	120 120 115 105 90 70 135 165 150 120 120 115 125 225 225 120 120 110 120 110 95 110 90 125 65 110 100 110 120 95 110 85 150 110 80 5 12 65 65 60 90 75 130 75 50 75 70 70 90 120 75 90 150 65 90	0.66 0.72 0.70 0.64 0.54 0.42 0.81 1.00 0.91 0.72 0.72 0.70 0.76 1.36 1.36 0.78 0.72 0.66 0.72 0.66 0.57 0.66 0.55 0.76 0.40 0.66 0.60 0.66 0.72 0.57 0.66 0.51 0.81 0.64 0.47 0.12 0.10 0.40 0.40 0.20 0.25 0.45 0.78 0.45 0.30 0.45 0.42 0.42 0.54 0.85 0.45 0.54 0.91 0.40 0.54



Carbon Chromium Vanadium Tungsten Molybdenum Cobalt	C CR V W MO CO	0.83 3.75 1.15 1.70 8.5	0.85 4.15 1.95 6.40 5.00	0.85 4.00 2.00 8.00	0.75 4.00 1.05 18.00	1.00 3.75 2.00 1.75 8.75	1.02 4.00 2.40 5.75 5.00	1.30 4.00 4.00 5.50 4.50	0.75 4.00 1.15 18.00 0.75 5.00	0.98 4.05 2.00 6.00 5.00 5.00	0.90 3.75 1.15 1.50 9.50 8.00	1.60 4.00 4.90 12.00 5.00	1.10 3.75 1.15 1.50 9.50 8.00	1.30 3.75 2.00 6.25 10.50	1.30 4.05 3.05 6.25 5.00 8.00	1.50 3.75 3.10 9.75 5.25 8.50	C CR V W MO CO

The above Crucible High Speed Steel Comparagraph illustrates on a weighted basis the properties of Wear Resistance, Red Hardness and Toughness for 15 grades of High Speed Steel.

Our Series of 60° Super High Helix, 3 Flute SE Rough and Finish End Mills are made from Powdered CPM REX20, an Equivalent to Conventional HSS Premium Cobalt with No Cobalt in Powdered form.

Erasteel produces powdered high-alloy ASP-23, ASP-30 and ASP-60 high speed steels. These powdered high speed steels are top quality and domestically warehoused. Their alloy ingredients are as follows:



Carbon C 1.28 1.28 2.30	Chromium CR 4.20 4.20 4.00	Vanadium V 3.10 3.10 6.50	Tungsten W 6.40 6.40 6.50	Molybdenum MO 5.00 5.00 7.00	Cobalt CO 0 8.50 10.50	Erasteel Hi-Alloy Powdered HSS's ASP-23 ASP-30 ASP-60