管用テーパタップの切削条件計算方法　pt（rc） | オーエスジー

The following formula is used to calculate the cutting data in the same way as for metric screws.

 

Rotation speed (S) = (cutting speed ×1000) ÷ Tool diameter ÷ Pi (3.14)

 

Feed speed (F) = pitch × rotational speed

 

The tool diameter is calculated using the "reference dimensions" and the pitch is calculated from the number of pils.
The reference dimensions are determined by the standard and cannot be calculated from the name like a unified thread.
Refer to the table of standard dimensions and pitches for tapered screws for pipes. (It's at the bottom of the page.) )

ROTATION SPEED = (5X1000)÷ 13.158 ÷ 3.14 = 121.02 ... ⇒ 120 MIN-1
Feed speed = 1.3368 × 120 = 160.4... ⇒ 160mm/min

The appropriate cutting speed depends on the type of tap and the material to be cut. Please check the catalog.

 

When machining with a tapered tap, the machining depth is also important.

Unlike parallel screws, the deeper you put it, the larger the screw becomes.

The processing depth of the tapered tap is up to the "reference diameter position" of the tap.

It is important to note that the size of the general use and the short thread type are different even if they are the same.
 

Reference dimensions and pitch of pipe screws