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▲ asked: what reason is often broken drill bit drilling

Net friend answer: broken bits because of overload, [multi-axis drilling tapping device] overload causes include:

1) bit too blunt.

2) feed rate is too large.

3) bottom hole drill [tapping booster] and bottom serious eccentricity.

4) drill wear red knife, feed rate is too large (hydraulic feed the most common)

The above information is for reference:

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