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Greenfield Thread Mills
Speeds and Feeds
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The Feeds & Speeds shown below are offered as recommended
starting parameters only. Condition of material, machine rigidity, part
fixturing, tool overhang as well as hardness should all be considered
before attempting any machining operation.
Minimum feed rate for any thread mill tool is 0.0003"
per flute. If severe conditions are present, reduce feed per tooth first
if possible, then speed last.
| Material |
Classification |
Typical
Grades |
Tool Shank Diameter and Number of Flutes Starting
SFPM & Suggested Feed in Inches per Flute
|
| 1/8" |
3/16" |
1/4" |
5/16" |
3/8" |
1/2" |
3/4" |
| 3 |
3 |
5 |
5 |
5 |
5 |
6 |
| Steel |
Plain
Carbon & Low Carbon up to 22 Rc |
AISI/SAE Types: 1005-1020, 1108-1119, 1213-1215,
1513-1518, 4012, 5015, 9310 |
600
.0003" |
600
.0003" |
600
.0005" |
600
.0006" |
600
.0007" |
600
.0010" |
600
.0015" |
| Medium Carbon & Alloy Steels |
Heat Treatable
Carbon & Alloys fro 22 to 32 Rc |
AISI/SAE Types: 1025-1095, 1130-1151, 1330-1345,
1520-1572, 4023-4063, 4120-4161, 4320-4340, 4620-4640, 8620-8660,
8740-8750, 6150, 51000, 52100 |
575
.0003" |
575
.0003" |
575
.0005" |
575
.0006" |
575
.0007" |
575
.0010" |
575
.0015" |
| Medium Carbon & Alloy Steels |
Heat Treatable
Carbon & Alloys fro 32 to 42 Rc |
AISI/SAE Types: 1040-1095, 1140-1151, 1330-1345,
1520-1572, 4023-4063, 4120-4161, 4330-4340, 4620-4640, 8620-8660,
8740-9750, 6150, 51000, 52100 |
525
.0003" |
525
.0003" |
525
.0005" |
525
.0006" |
525
.0007" |
525
.0010" |
525
.0015" |
| Stainless Steels |
Austenitic
Stainless Steels |
Types: 301-304, 310, 316, 321, 347 |
525
.0003" |
525
.0003" |
525
.0005" |
525
.0006" |
525
.0007" |
525
.0010" |
525
.0015" |
| Stainless Steels |
Martensitic
Stainless Steels |
Types: 403, 410, 416, 420, 430, 431, 440C |
550
.0003" |
550
.0003" |
550
.0005" |
550
.0006" |
550
.0007" |
550
.0010" |
550
.0015" |
| Stainless Steels |
Precipitation
Hardening Stainless Steel |
Types: 15-5PH, 17-4PH, AM350, AM355, AM363, PH13-8Mo,
PH14-8Mo |
300
.0003" |
300
.0003" |
300
.0005" |
300
.0006" |
300
.0007" |
300
.0008" |
300
.0012" |
| Nickel |
Nickel
& Nickel Base Alloys |
Inconel 700, 713C, 718, Inconel X, Monel 400, 401,
404 & K, Rene 41, Rene 95, Waspoloy, Udimet 500 &700 |
120
.0003" |
120
.0003" |
120
.0005" |
120
.0006" |
120
.0007" |
120
.0008" |
120
.0010" |
| Titanium |
Titanium
& Titanium Alloys |
Commercially Pure Ti, Ti-6AL-4V, Ti-8AL-1Mo, Ti-7Al-4Mo |
100
.0003" |
100
.0003" |
100
.0005" |
100
.0006" |
100
.0007" |
100
.0007" |
100
.0007" |
| Cast Iron |
Gray,
Malleable, Ductile (Nodular) |
ASTM A48, A220, A436, A319, A536, A602, SAE J158,
SAE J434 |
600
.0003" |
600
.0003" |
600
.0006" |
600
.0007" |
600
.0008" |
600
.0010" |
600
.0015" |
| Non Ferrous |
Wrought
& Low Si Cast Aluminum |
6061, Free Machining Brass |
1700
.0003" |
1700
.0003" |
1700
.0006" |
1700
.0007" |
1700
.0008" |
1700
.0010" |
1700
.0015" |
* To adjust inches per minute for internal threads:
If D1 is the major diameter of the thread to be cut
and d1 is the diameter of the cutter, then calculate the programmed feed
rate by taking ((D1-di)D1) X (calculated feed rate (IPM) from above) Example:
To cut a 5/8-18 thread with a 3/8 dia., 4 flute cutter in Cast Iron the
numbers above yield a feed rate of 12.3 IPM. (1536 RPM x .008 ipr). The
programmed feed rate would be ((.625-.375)/.625)x12.3 = 4.9 IPM.
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