It is possible, by simply changing the parameters, to influence the diameter, the pitch direction and the quality of the thread, as well as the tool life of the thread milling tools.

The most important preconditions for successful thread milling are a stable milling machine with a powerful 3D CNC control (2 1/2D can be used with restrictions only), suitable milling tools and a sturdy, solidly clamped workpiece.

Optimized parameter programs make it possible to reduce programming work to a minimum.

We would like to underline, at this stage, that our programming recommendations are written in analogy to DIN 66025 and that they are not compatible for all systems and installations in their present form. For that reason, we cannot assume any guarantee for them! Printing errors or misinterpretation of our programming recommendations do not constitute any rights to claims. We strongly advise to run simulations with any recommended program before practical use!

Make sure to check the machine specific system of coordinates (X, Y, Z)!

In our programming examples, we generally suppose the work level XY to be situated under G17.

Calculation of number of revolutions:

n = ((V_c x 12) / ( d₁ x π)) (min ^-1)

Calculation of the feed on the contour:

v_f contour = f _z x z x n (inch/min)

Feed in relation to the center point path:

(only with a corresponding program)

Milling of internal threads:

v_{f center point} = (v_{f contour} x (D-d₁)/D) (inch/min)

Explanation of abbreviations:

v_c = cutting speed (SFM)
n = Number of revolutions (min-1)
V_f = feed speed (inch/min)
f_z = feed per tooth (inch)
z = number of teeth
D = nominal thread diameter
d₁ = outside diameter of thread mill

Programming Instructions

BGF [120 KB PDF]
EP [52 KB PDF]
GF [144 KB PDF]
GF Tapered [112 KB PDF]
GSF [148 KB PDF]
WSP [56 KB PDF]
ZBGF [96 KB PDF]