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Thread Milling Guide for CNC Users

The document provides material recommendations for thread milling cutters, including recommended cutting speeds, feeds per tooth, and feeds for drilling based on the material being cut. It lists various material groups like steels, aluminum alloys, cast iron, and their appropriate tensile strengths, hardness, and cutting parameters. It also provides formulas for calculating cutting speeds and feeds. Lastly, it mentions that Guhring's thread mill software simplifies CNC programming for thread milling.

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Haizmeer Bonzie
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115 views1 page

Thread Milling Guide for CNC Users

The document provides material recommendations for thread milling cutters, including recommended cutting speeds, feeds per tooth, and feeds for drilling based on the material being cut. It lists various material groups like steels, aluminum alloys, cast iron, and their appropriate tensile strengths, hardness, and cutting parameters. It also provides formulas for calculating cutting speeds and feeds. Lastly, it mentions that Guhring's thread mill software simplifies CNC programming for thread milling.

Uploaded by

Haizmeer Bonzie
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Materials and application recommendations

Recommendations for
thread milling cutters
Material group Tensile strength Hardness Cutting speed Feed Feed for drill
MPa (N/mm2) HB vc (m/min) per tooth per revolution
fz (mm) fb (mm)
Structural steels 850 80 - 120 0,02 - 0,10
Free-cutting steels 1000 80 - 120 0,02 - 0,10
Unalloyed case hardened steels 750 80 - 120 0,02 - 0,10
Unalloyed heat-treatable steels 850 80 - 120 0,02 - 0,10
Alloyed case hardened steels 850 1200 60 - 80 0,01 - 0,08
Alloyed heat-treatable steels 850 1200 60 - 80 0,01 - 0,08
Alloyed tool steels 1000 60 - 80 0,01 - 0,08
High speed tool steels 650 1000 60 - 80 0,01 - 0,08
Stainless- and acid-resistant steels, sulphured 850 50 - 80 0,02 - 0,10
austenitic 850 50 - 70 0,02 - 0,10
martensitic 850 50 - 70 0,02 - 0,10
Structural steels 800 80 - 100 0,02 - 0,10
Free-cutting steels 1000 80 - 100 0,02 - 0,10
Case hardened steels 1000 80 - 100 0,02 - 0,10
Thread Milling

Heat-treatable steels 1200 80 - 100 0,02 - 0,10


Technology

Nitriding steels 1200 80 - 100 0,02 - 0,10


Spheroidal graphite iron 240 80 - 120 0,02 - 0,10 0,05 - 0,20
Aluminium and Al-alloys 400 150 - 300 0,05 - 0,20 0,05 - 0,25
Al wrought alloys 400 150 - 300 0,05 - 0,20 0,05 - 0,25
Al cast alloys 10 % Si 600 150 - 300 0,05 - 0,20 0,05 - 0,40
> 10 % Si 600 100 - 200 0,05 - 0,20 0,05 - 0,30
Cast iron 240 100 - 150 0,05 - 0,15 0,05 - 0,25
Spheroidal graphite iron 240 80 - 120 0,05 - 0,15 0,05 - 0,20
Malleable cast iron < 300 80 - 120 0,05 - 0,15 0,05 - 0,20
Brass, short-chipping 600 150 - 250 0,05 - 0,25 0,05 - 0,40
long-chipping 600 150 - 250 0,05 - 0,25
Plastics 100 - 200 0,05 - 0,25 0,05 - 0,40
Magnesium-alloys 450 150 - 300 0,05 - 0,25 0,05 - 0,40
Titanium and Ti-alloys 1200 40 - 60 0,01 - 0,08
Ni-alloys 1200 40 - 60 0,01 - 0,08

The surface of a thread milling cutter does not influence the easy-to-machine materials
cutting data, but the suitability for materials: steels and Ni-alloys
abrasive materials

Formula of calculation Guhring Thread Mill


vc = cutting speed
d. .n vf = contour feed CNC programming made easy
vc = [m/min]
1000 vm = centre point path feed
n = revolutions
v . 1000 Guhrings Thread Mill software considerably simplifies
n= c . [min-1] z = number of teeth
d fz = feed per tooth
fb = feed for drill per revolution* CNC programming. With the assistance of a clear input
vf = n . z . fz [mm/min] vb = drill feed rate*
mask, the user enters all the required data, i.e. thread
D = nom. of thread [mm]
v . (D - d) [mm/min] d = milling cutter nom. [mm]
mill type, thread type and diameter, machine parameters
vm = f * for drill/thread milling
D
etc. and with this data produces the relevant CNC
vb = n . fb [mm/min]
program.

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