Sandvik-coromant Threading Manuale Utente Scaricare il pdf (Pagina 39)

. Applications – Thread millin

Choice of cutting diameter

The cutter engagement will create a minute form error on the root

of the thread pro le. In internal applications, the relationship be-

tween threading diameter, cutting diameter and pitch will affect the

true radial depth of cut, a

eff, which becomes much larger than the

chosen radial depth of cut. A larger true ae will increase the devia-

tion in the root of the thread.

To minimize the pro le deviation, the cutter diameter should be no

greater than 70% of the threading diameter.

Ex M30x3

Dia 21.7 gives a pro le deviation of

0.07 mm (.0027 inch)

Dia 11.7 gives a pro le deviation of

0.01 mm (.0004 inch)

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Sandvik-coromant Threading Manuale Utente Pagina 39