Widia GTD

Widia GTD (formerly Greenfield) Thread Mills Speeds and Feeds

 

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.