151 Contents: Page: Conversion of Cutting Speed to Rotational Speed Tool Selection Carmex Mill-Thread Catalogue and CNC Programming Software Example of Thread Milling CNC Program for Internal Threading Mill-Thread Inserts Carbide Grades, Speed and Feed Selection Spiral Mill-Thread Inserts, Speed and Feed Selection Spiral Finish, Speed and Feed Selection Contents: Page: D-Thread type CMT type Mill-Thread Solid Carbide Grades, Speed and Feed Selection MT, MTB, MTZ, EMT types MTQ type Mini Mill-Thread (MTS) and MTI types DMT type DMTH type Mini Mill-Thread (MTSH) type MTH type 157 158 159 160 161 162 162 163 164 152 153 154 154 155 155 156 Mill-Thread Technical Section
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151
Contents: Page:
Conversion of Cutting Speed to Rotational SpeedTool SelectionCarmex Mill-Thread Catalogue and CNC Programming SoftwareExample of Thread Milling CNC Program for Internal ThreadingMill-Thread Inserts Carbide Grades, Speed and Feed SelectionSpiral Mill-Thread Inserts, Speed and Feed SelectionSpiral Finish, Speed and Feed Selection
Contents: Page:
D-Thread typeCMT typeMill-Thread Solid Carbide Grades, Speed and Feed SelectionMT, MTB, MTZ, EMT typesMTQ typeMini Mill-Thread (MTS) and MTI typesDMT typeDMTH typeMini Mill-Thread (MTSH) typeMTH type
157158
159160161162162163164
152153154
154
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156
Mill-Thread Technical Section
Mill - Thread Technical Section®
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Conversion of Cutting Speed toRotational Speed Conversion of selected cutting speed to rotationalspeed is calculated by the following formula:
121222
12
1.25
400
Example:
D=Cutting diameter
V=400 ft/minD=1.25
Internal Thread External Thread
Mill - Thread Technical Section®
153
Tool SelectionFor indexable and solid carbide Mill Threads
The following chart provides a fairly accurate visual selection tool for Internal Threading.The chart is suitable for the following thread forms: ISO, UN, WHIT, NPT, NPTF, BSPT and PG.
If you need assistance, please call your localdistributor and ask for help in selecting the appropriatetool as well as for a CNC program to suit your CNC millingmachine.
Any tool with a small cutting diameter can produce larger diameter threads.Example: Internal thread 11/4 x 16UN:Find a Milling Tool to produce d=1.25 Internal right hand UN thread with a thread pitch P=1/16 inchAs can be seen from the chart above, the two red linesintersect at a selected tool with a cutting diameter of D=79 inch Chosen toolholder: SR0790 H21
Example of Thread Milling CNC Programfor Internal Threading
This software is provided by Carmex to assist you, thethreadmilling user, to select and apply the correct toolto machine threads on CNC machining centers. Theprogram will !nd tools and inserts which are suitable for your application, calculate cutting data and generate a CNC program for a variety of controls.
The software is available at our website and on a CD-ROM.
Right hand thread (climb milling) from bottom up. Program is based on tool center.This method of programming needs no tool radiuscompensation value other than an o"set for wear.
Spiral Mill-Thread Inserts Speed and FeedSelection
Sub-Micron Grade with Titanium Aluminum Nitride multi-layer coating (ISO K10 - K20). This is a general purpose grade, which can be used with all materials; it should be runat medium to high cutting speeds.
Sub-Micron Grade with Titanium Aluminum Nitride multi-layer coating (ISO K10 - K20). This is a general purpose grade, which can be used with all materials; it should be run atmedium to high cutting speeds.
As you may note, cutting speed is shown in range terms. In most standard cases choosing a speed in the middle of the range would be a good choice for a start.For hard metals reduce cutting speed.
Spiral Finish Speed and Feed SelectionSub-Micron Grade with Titanium Aluminum Nitride multi-layer coating (ISO K10 - K20).This is a general purpose grade, which can be used with all materials; it should be run at medium to high cutting speeds.
Sub-Micron Grade with Titanium Aluminum Nitride multi-layer coating (ISO K10 - K20). This is a general purpose grade, which can be used with all materials; it should be run at medium to high cutting speeds.
Sub-Micron Grade with Titanium Aluminum Nitride multi-layer coating (ISO K10 - K20). This is a general purpose grade, which can be used with all materials; it should be run at medium to high cutting speeds.
MT7
ISO MaterialsCuttingSpeedft/min
Feed inch/toothCutting Diameter=D
.39 .47 .70 .98
PLow and Medium Carbon Steels <0.55%C 197 - 394 .0063 .0067 .0079 .0087
Sub-Micron Grade with Titanium Aluminum Nitride multi-layer coating (ISO K10 - K20). This is a general purpose grade, which can be used with all materials; it should be run at medium to high cutting speeds.
MT7
For cutters with long cutting length reduce feed rate by 40%
ISO MaterialsCuttingSpeedft/min
Feed inch/toothCutting Diameter=D
.08 .12 .16 .24 .31 .39 .47 .55 .63 .79 .98
P
Low and Medium Carbon Steels <0.55%C 330- 820 .0012 .0016 .0016 .0024 .0028 .0032 .0037 .0042 .0047 .0057 .0070
MTQ typeSub-Micron Grade with Titanium Aluminum Nitride multi-layer coating (ISO K10 - K20). This is a general purpose grade, which can be used with all materials; it should be run at medium to high cutting speeds.
MT7
ISO MaterialsCuttingSpeedft/min
Feed inch/toothCutting Diameter=D
.39 .47 .55 .63 .79 .98
PLow and Medium Carbon Steels <0.55%C 330 - 820 .0022 .0026 .0029 .0033 .0040 .0049
Mini Mill-Thread MTS and MTI typesSub-Micron Grade with Titanium Aluminum Nitride multi-layer coating (ISO K10 - K20). This is a generalpurpose grade, which can be used with all materials; it should be run at medium to high cutting speeds.
MT7
Sub-Micron Grade with Aluminum Titanium Nitride (AlTiN) multi-layer coating (ISO K10-K20). Extremely high heat resistant and smooth cutting operation, for high performance, and normal machining conditions. General purpose for all materials.
MT8
Ultra-!ne sub-micron grade with advanced PVD triple coating.MT11
Features Mini Mill-Thread TapsThread surface quality High Medium
Thread geometry Very accurate MediumThread tolerances 4H, 5H, 6H with std cutter 6H with standard tap, 4H with specific tap
Machining time Same as tap or shorter ShortTool breakage Almost not possible Could happen oftenMachining load Very low High
Range of thread diameters Wide range of diameters Specific tap for each diameterRight/Left hand threading Same cutter Specific tap for each
Geometric shape Full profile Partial profile
Mini Mill-Threadvs. Taps
®
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Mill - Thread Technical Section
DMT type
DMTH type
Sub-Micron Grade with Titanium Aluminum Nitride multi-layer coating (ISO K10 - K20). This is a general purpose grade, which can be used with all materials; it should be run at medium to high cutting speeds.
Ultra-!ne Sub-Micron grade with advanced PVD triple Blue coating
MT7
MT11
ISO MaterialsCuttingSpeedft/min
Feed inch/toothCutting Diameter=D
.16 .20 .24 .31 .35 .39 .47
PLow and Medium Carbon Steels <0.55%C 200-395 .0012 .0012 .0016 .0020 .0020 .0020 .0020