Incomplete Re-pointing (Worn part not removed)

UT tolerance: Complete re-pointing (No worn part remaining)

Hole Qualities

A:Poor registration accuracy

Because the worn part on cutting edge has not been fully removed, the point of drill bit remains worn causing a front taper shape. This causes increasing thrust force and moment, promoting poor registration accuracy.

Countermeasure

Check re-pointed amount, fully re-point to remove worn part.

(If the overall length remains the same after re-point, please check the re-pointed amount.
The re-pointed amount may vary due to the unevenness of some new drill bits overall length being under tolerance.)

Example) Aspects of minimum re-pointing amount

・Removes front taper which is caused by flank wearing.
・Evaluate restoration of registration accuracy (before and after re-pointing)

*Click here "About re-pointing amount"