Обший каталог Yamawa 2016 - 2017 - страница 842

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22. 22. Features of MC-Helical Thread Mills

Metric thread Metric thread

[ Minor dia. basis] [ Tool basis] Tool cut Tool transverse

where,

: Nominal size of internal threads

: Basic minor diameter of internal threads

: Minor diameter before cutting

: Outside diameter of tool

: 0.866025P

: Pitch

: Tolerance of pitch diameter for producing internal thread

: Shrinkage after cutting

(Set up in the middle of pitch diameter tolerance)

: Difference between of basic thread profile and O.D. of the cutters.

50 2500.02 0.125 450.02 0.05
■Approaching and leaving to and from work material
50 2000.02 0.120 400.02 0.05
30 1800.02 0.115 300.02 0.05On approaching and leaving to and from work material, the cutter must always be traversed in
30 1500.02 0.110 150.02 0.04helical interpolating movement so that the cutter enables smooth cutting in and out. And it is
30 2000.03 0.110 150.03 0.05necessary to cut the material gradually by the lead of screw thread. Otherwise, threads can be
50 1500.03 0.1530 500.03 0.08thinned.
50 3000.03 0.1550 900.03 0.05
Initial cutting A B
50 1800.03 0.1540 800.03 0.05