Thread Milling Formulas

Finding Programmed Diameter Feed Rate O/D Finding Programmed Diameter Feed Rate I/D Ramping In 90 Degrees Ramping In 180 Degrees Technical and Customer Support Need a special quote on Threadmills? Click here!

Programmed Diameter Feed Rate O/D    (Back to formula list)

When thread milling, your linear feed must be converted to circular feed

Programmed Diameter Feed Rate I/D     (Back to formula list)

When thread milling, your linear feed must be converted to circular feed

 (Back to formula list)
 (Back to formula list)

In one case we cut almost 600 5/8" threads in a 4" grid with a 1.5" thread length into a steel tooling plate.  Even though we initially generated a wrong program, spiraling the entire thread length downward, we used only one tool for the entire job.

In another case we cut metric threads M30x1.5 into a flat bottom hole into copper plate.  The tolerance was very tight and we had to cut the thread almost to the bottom.  The fact that we used a threadmill allowed us to cut the thread very fast while being able to reach exactly the required class of fit.  This thread would have been very difficult to machine using any other method known to us.  We ran a spindle speed of 2000 rpm and a feed rate of 10" (to be on the safe side).

Both jobs were performed on high speed milling machines, with limited torque available.  Using threadmilling, we generated better threads in less time.

Klaus Hoffmann
MfG
IMTA, Inc.

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Advantages for solid carbide, straight fluted (STM): Super Sub-micron Grain Carbide Guaranteed Concentricity Sizes from .110 in. and up Cut threads in hardened materials Cut threads in super alloys Resharpenable Special thread forms and pitches available Better control of pitch diameter
Advantages for solid carbide, helically fluted (HTM): Dimensional drawing: Super Sub-micron Grain Carbide Guaranteed Concentricity Sizes from .250 in. and up Cut threads in hardened materials Cut threads in super alloys Smoother cutting, faster feeds and speeds Special thread forms and pitches available Better control of pitch diameter
Advantages for Helical Solid Carbide NPT and NPTF Dimensional drawing: Requires less horsepower than a tap Superior thread quailty and form over conventional tapping methods Better control of pitch diameter Cut threads in hardened materials Cut threads in super alloys Guaranteed concentricity Special thread forms and pitches available
Advantages for Straight Solid Carbide NPT and NPTF Dimensional drawing: Requires less horsepower than a tap Superior thread quailty and form over conventional tapping methods Better control of pitch diameter Cut threads in hardened materials Cut threads in super alloys Guaranteed concentricity Special thread forms and pitches available
Advantages for Brazed Carbide NPT and NPTF Dimensional drawing: tm1500crop.gif Text to be at left of custom area: Requires less horsepower than a tap Superior thread quailty and form over conventional tapping methods Better control of pitch diameter Cut threads in hardened materials Cut threads in super alloys Guaranteed concentricity Special thread forms and pitches available
Advantages for: Brazed Carbide UN internal without coolant Brazed Carbide UN internal with coolant Dimensional drawing: Longer reach More shock resistant Resharpenable Repairable Guaranteed concentricity Through the tool coolant readily available Special thread forms and pitches available Better control of pitch diameter	Need a special quote on Threadmills? Click here!