There are several ways to drill holes larger than 3.2mm diameter。
With “step-drilling” or "pre-drilling",spindle load can be significantly reduced,resulting less spindle damage & better swarf draft.
With a special designed point angle of 165°,standard back-up plate 1.5mm thicknrss can still be used.
φD mm |
Flute Length mm |
3.20 |
13.00 |
3.25 |
13.00 |
3.30 |
13.00 |
3.35 |
13.00 |
3.40 |
13.00 |
3.45 |
13.00 |
3.50 |
13.00 |
3.55 |
13.00 |
3.60 |
13.00 |
3.65 |
13.00 |
3.70 |
13.00 |
3.75 |
13.00 |
3.80 |
13.00 |
3.85 |
13.00 |
3.90 |
13.00 |
3.95 |
13.00 |
4.00 |
13.00 |
4.05 |
13.00 |
4.10 |
13.00 |
4.15 |
13.00 |
4.20 |
13.00 |
4.25 |
13.00 |
4.30 |
13.00 |
4.35 |
13.00 |
4.40 |
13.00 |
4.45 |
13.00 |
4.50 |
13.00 |
4.55 |
13.00 |
4.60 |
13.00 |
4.65 |
13.00 |
4.70 |
13.00 |
4.75 |
13.00 |
4.80 |
13.00 |
4.85 |
13.00 |
4.90 |
13.00 |
4.95 |
13.00 |
5.00 |
13.00 |
5.05 |
13.00 |
5.10 |
13.00 |
5.15 |
13.00 |
5.20 |
13.00 |
5.25 |
13.00 |
5.30 |
13.00 |
5.35 |
13.00 |
5.40 |
13.00 |
5.45 |
13.00 |
5.50 |
13.00 |
5.55 |
13.00 |
5.60 |
13.00 |
5.65 |
13.00 |
5.70 |
13.00 |
5.75 |
13.00 |
5.80 |
13.00 |
5.85 |
13.00 |
5.90 |
13.00 |
5.95 |
13.00 |
6.00 |
13.00 |
6.05 |
13.00 |
6.10 |
13.00 |
6.15 |
13.00 |
6.20 |
13.00 |
6.25 |
13.00 |
6.30 |
13.00 |
6.35 |
13.00 |
6.40 |
13.00 |
6.45 |
13.00 |
6.50 |
13.00 |
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endmill@richvertex.com