Page 82 - THREADING CATALOG

USER GUIDE
THREAD TURNING Radial Infeed Modified Flank Infeed (recommended)

With radial infeed, the thread is machined simultaneously
Modified flank infeed is very similar to the flank infeed
method, but the angle between the cutting edge to the
and symmetrically with two flanks. In this processing
side of the threading profile can be between 0.5° to 5°.
method, the chip tends to bend on either side of the
cutting edge against each other, as a result of the
In this method, all the advantages of flank infeed
chip winding process, and the removal of the chip
are retained while the disadvantages caused from
becomes more difficult. This method creates large
forces on the cutting edge and warming of cutting
threading profile are prevented. Modified flank infeed
edges which causes short tool life and limits the
is the recommended method for all thread turning
possible depth of cut. Cutter wear is uniform on both
operations and is suitable for all insert types.
sides of the cutting edge. Radial infeed is acceptable friction between the cutting edge and the side of the
in the production of fine pitch threading or finish Alternating Flank Infeed
passes, to ensure threading profile accuracy.
In this method, cutting edges work alternately, i.e.
Flank Infeed each time the cut is performed by another side of the
cutting edge. This method can significantly increase
With the flank infeed method, the cutting edge moves tool life due to two cutting edges taking part in the
parallel to one of the sides of the threading profile. The threading production. Constant changing of the chip
threading is produced mainly by one side of the cutting evacuation direction can result in poor surface quality.
edge. The chips are cut off with one cutting edge of the This method is usually used for very large pitches and
cutter, which improves chip evacuation relative to the radial for threading forms such as Acme and Trapeze.
method, and therefore the cutting depth per each pass
can be bigger. Using the flank method provides better heat
dissipation, which improves tool life but causes uneven
wear of the cutter’s cutting edges. As cutting is done
mainly with one cutting edge, friction is created between
the cutting edge and the side of the threading profile,
which causes poor surface quality and possible vibration.

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