Make Your Dowel Drill Bits Drilling More Efficiently By Solving 6 Issues

Published On: October 27, 2020

Boring drill can be efficient in drilling holes on wooden board. But problems sometimes happen when it works, which make the drilling less efficiency and disturb us a lot. But have you ever considered that once we solved these problems or avoid these problems, our dowel drill bits can work in a higher efficiency? To solve these problems and make the drilling tool speed up, we have collected 6 problems which may happen when you do the wood drilling, and we also provide 6 corresponding solutions to help you deal with these problems and make your dowel drill bits work more efficiently.


1.Chips around holes after drilling

Sometimes there may be some small broken parts around the hole, make our drilling a failure. To solve this question, except check whether there are influences made by back taper and bit bounce, you also need to check whether the spindle and quick change joint are coaxial,configuration of machine tool compacting device, pressure is enough or not and whether work piece will shake or not when drilling. It will also create these broken places if cutting edges is higher than the center tip.

2.Entrance hole is small but exit side is big

This problem may be induced by bit bouncing and misalignment of your main shaft and quick change joint. If there’s such problem happened, you need to check the bit or change the main shaft and the joint.

3.There are drilling smoke and drill bits get dark

Serious central bit bouncing or central bit and shaft are misalign, no positive or back taper, small main relief angle(it should be 12°to 15°), deflection angle of the main rear angle is opposite to rotation of bits will all lead to drilling smoke and make drill bits get dark. But it may also caused by deficiency of machine tool pressure. If glue which used in boards is not dried or there’s too much glue in boards will make your drills getting dark, too.

4.Chip removal is not smooth or even don’t work

To solve this problem, you may check if there’re problems like small spiral groove or helicalangle, transition between alloy and cutter body is not smooth enough, primary rear angle is too small to be a secondary value,center tip is too short and thick. Also, before drilling, you need to check whether your dowel drill bits suit your machine or not(2800-3500 RPM is a normal value). Besides, too much glue and if glue is still wet in wooden board will also cause this problem. Or, you may make a simple mistake—make a wrong direction of the rotation.

5.Chips heed up on flank surface

This problem may happen when there is too much glue in processing materials, just change the material you are going to processing or change your bits. In addition, when drill bitsreaches phase transition, it starts to wear seriously, which will also cause a lot of cumulative chips on rear cutter surface during drilling. And unreasonable production of split cutting edge will also cause a lot of cumulative chips on back surface during drilling.

6.Drill bit bends or breaks when drilling

This problem mainly happened on small size dowel drill bits or extension dowel drill bits.We will talk about this in two aspects. First, from the bit itself. Small size bit have poorerrigidity than normal dowel drill bits.If it sheat treatment does not be well treated, it will easily be distorted or broken. Unreasonable design of drill bit helix Angle will also lead to this problem. In addition, an extended bit or a bit made up of defectiveraw material will cause the bit to twist and bend or even break during drilling.


Secondly, let’s talk it from the side of application. If depth of drill hole is more than four times of the drill bit’s diameter, we call it a “deep hole”. When there is a deep hole need to be drill, we need to separate drill process to several times instead of settling a matter at one go. And if you finish it with only one drill, then your dowel drill bits may twist and bend deformation or even break when drilling. Also, RPM of your drill bits should match RPM of your boring machine. Otherwise, your drill bits may also get damaged.Too much glue in plates or glue is too wet will easily cause bits to twist and bend or break when drilling with small specification dowel drill bits.


These are six ways to improve your drilling efficiency. If you have met these problems when you use your dowel drill bits, you can try methods we provide above. Hope these methods can help you and thanks for your reading.

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