Page 97 - Die_and_Molds_User_Guide_7861458_2017

Fig. 47

a
VF VF

ap
ap
∝

In addition to equations (15) and (16), effective cutting diameter De and chip thinning factor KTH
can also be found from Table 70. Just as well, the table data is very useful for quickly estimating
cutting data.

In milling with ball nose cutters, correct feed and speed calculations should be based on the
corresponding effective diameter of a cutter and the chip thinning factor defined by application.
Leaving them out can lead to to poor operational performance and less productivity.

Table 70 Effective Cutting Diameter De, mm, and Chip Thinning Factor KTH for
Ball Nose Milling Cutters

ap, D, mm Milling Tools
mm SØ4 SØ5 SØ6 SØ7 SØ8 SØ10 SØ12 SØ16
De KTH De KTH De KTH De KTH De KTH De KTH De KTH De KTH
0.2 1.7 2.3 1.9 2.5 2.1 2.8 2.3 3 2.5 3.2 2.8 3.6 3.1 3.9 3.5 4.5
0.3 2.1 1.9 2.4 2.1 2.6 2.3 2.8 2.5 3 2.6 3.4 2.9 3.7 3.2 4.3 3.7
0.5 2.6 1.5 3 1.7 3.3 1.8 3.6 1.9 3.9 2.1 4.3 2.3 4.8 2.5 5.6 2.9
0.7 3 1.3 3.5 1.4 3.8 1.5 4.2 1.7 4.5 1.8 5.1 1.9 5.6 2.1 6.5 2.4
1 3.5 1.1 4 1.2 4.5 1.3 4.9 1.4 5.3 1.5 6 1.7 6.6 1.8 7.7 2.1
2 4 1 4.9 1 5.6 1.1 6.3 1.1 6.9 1.1 8 1.2 8.9 1.3 10.6 1.5
3 — — — — 6 1 6.9 1 7.7 1 9.1 1.1 10.4 1.1 12.5 1.3
4 — — — — — — — — 8 1 9.8 1 11.3 1.1 13.8 1.1
5 — — — — — — — — — — 10 1 11.8 1 14.8 1.1
6 — — — — — — — — — — — — 12 1 15.5 1
7 — — — — — — — — — — — — — — 15.9 1
8 — — — — — — — — — — — — — — 16 1

97

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