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Tool Selection
For indexable and solid carbide Mill Threads
The following chart provides a fairly accurate visual selection tool for Internal Threading. The chart is suitable for the following thread forms: ISO, UN, WHIT, NPT, NPTF, BSPT and PG.
Conversion of Cutting Speed to
P=Thread Pitch
Rotational Speed A
TPI mm
1 D= Tool cutting diameter
| N | 4 | 6.0 | |||||
| Conversion of selected cutting speed to rotational | |||||||
| speed is calculated by the following formula: | 5 | 5.0 | |||||
| Example: v 120 m/min | |||||||
| D | 30 mm | 6 | 4.0 | ||||
| = | m | ||||||
| Vx 1000 | 120 x 1000 | V | 3.5 | ||||
| N = | =1274 RPM V | D | |||||
| JT x D | 3.14 x 30 | 8 | 3.0 |
D=Cutting diameter 00 D=21 D=29
| 10 | o Q O 10 2.5 |
| 1 " | |
| 0 | |
| 12 | 8 2.0 |
| External Thread Internal Thread 16 | u 1.5 |
| 20 1.25 | |
| 24 | D=12 D=9 |
| 1.0 | |
| 32 0.75 | |
| 3 | |
| 48 | 090 0.5 |
Left Hand Right Hand Left Hand
| Thread | Thread | Thread | mm | 4 | 5 | 6 | 7 | 8 | 9 10 11 12 13 14 15 16 18 20 22 24 26 28 30 32 34 36 38 40 44 48 52 58 64 | ||
| ¥ | § | inch | / |
* 1 4 3/8 1/2 5/8 3/4 1 1.25 1.5 2 2.5
8 <N Any tool with a small cutting diameter can produce large diameter threads d=Thread Diameter C/5 .
Example: Internal thread M30 x 1.5: Find a Milling Tool to produce d=30 mm Internal right hand ISO thread with a thread pitch P=1.5 mm. As can be seen from the chart above, the two red lines
. Right Hand
intersect at a selected tool with a cutting diameter of D=21 mm
Thread
Chosen toolholder: SR 0021-H21 A Insert: 21 I 1.50ISO TTIM45
If you need assistance, please call your local distributor and ask for help in selecting the appropriate tool as well as for a CNC program to suit your CNC milling machine.
d=30
1
V
P=1.5