Why Does a Drill Bit Hot? – Top 09 Reasons

A drill bit can produce few amounts of heat due to the drilling process. It is common for all. But it can be generated more heat due to many factors. I will explain here all in detail, why does a drill bit hot? So let’s see.

A drill bit is hot due to poor cutting edge and angle, using a wrong drill bit, using a high RPM, applying more thrust, drilling with no cutting oils, and inner clogging due to swarfs. It would help if you use a proper drill bit with recommended RPM rate and cutting oil to reduce the drill bit heat.

If you are not able to reduce heat generation, the drill bit can be heated rapidly. Finally, it will be overheated and melt. This kind of action happened in the hard materials mostly. In order to protect the drill bit, you had better read all reasons and avoid the drill bit heating. So keep reading until the end.

If your drill bit is already hot you can use these 07 Tips to Cool the Drill Bit.

Improper Cutting Angle

Right Drill Bit Angle

Any drill bit has a cutting angle. The cutting angle is really important for the drill bit. When there is a proper cutting angle, it can easily cut and remove the material. When it is reduced, it will be slippering the surface. When the surface is slippering, it can generate more heat due to friction. The final result is a high heated drill bit.

Normally Soft materials such as wood and aluminum need a 118-degree cutting angle, and hard materials such as cast iron need a 135-degree drill bit. If there are wrong drill bits, it will take much time, and both drill bit and drilling machine can be heated more and more. When you drill cast iron this guide will help you.

If there is no proper cutting angle, you can sharpen it.

Blunt Cutting Edge

Blunt Drill Bit

The cutting edge can be damaged due to abrasion. When we drill wood using these 13 drill bits, we may meet inside the nail. When we drill through a nail, the bit can be damaged easily. If the drill bit is not made with a carbide tip, it can be damaged easily. When my drill bit is damaged or blunt I use this drill bit sharpening guide.

The Blunt drill bit end is not linear. There is a curve, and those are not able to cut and remove the materials continuously. Because of this reason, tool can be slippered on the drilled material, and heat is produced badly. As a result of this drill bit will be heated.

Select Wrong Drill Bit

When you select a drill bit for wood, metal, it is really important. You must select a drill bit as it is compatible with the geometry, coatings, and manufactured material. I use these 06 Tips when I select a drill bit.

Imagine you use the masonry drill bit for steel drilling. It is an impossible task. Wood drill bits are made for cutting low hardness materials. By using that and drill the steel will overheat the drill bit.

When you drill any material, it should be lower in the Rockwell C hardness scale than the drill bit hardness value. You may not drill high hardness material using a low hardness drill bit.

When you select it, it will be heated more and more due to friction, and finally, it can be melt. This video will show it clearly.

You can Improve your drilling ability by using these 15 Drilling Tips for wood, steel, concrete, and glass.

Use High RPM

Recommended RPM is required for the drilling materials. Normally most material has recommended drilling RPM to increase the efficiency of the work. If the RPM is high, tool can be rotated at high speed. When the tool RPM is high, it touches the surface at a high rate. Due to this, it can be heated.

Normally wood drilling requires high RPM, and Steel, concrete, stone, brick, and glass requires less RPM. when the drilling material is tougher, its heating amount is high.

Read More About – How to Drill Cast Iron? – The Detailed Guide

Too Much Thrust

When we drill, we must apply the constant force. Normally this force is a thrust force. When we thrust, it should not be too much. When the thrust is high, its cutting amount is trying to increase. Due to this, the tool produces more torque, and finally, the drill bit and the drilling machine are both heated unexpectedly.

We should not thrust much to the drill while the chips are removed in a gentle way. That is the sufficient force you should apply to the drill. When you use bench drills, this can happen mostly. You can apply more force when you use the bench drill, and the heating also highly affects the bench drill.

Although you cutting oil, you can see there is a smoke rise from the drill bit. This is occurred due to high-speed drilling and much thrust. So use less RPM and reduce the thrust to the drill bit.

Read More About – 09 Most Cordless Drill Problems and Solutions

No Cutting Oil

While you drill hard material, you should use the cutting oil. Cutting oil acts as a lubricant as well as heat transfer. When you drill steel, you must use the cutting oil. If you drill without cutting, drill bit can be easily overheated. Good cutting oil should have high thermal resistance and lubricant properties. Due to this, many ingredients have been added to the cutting oil in order to increase the thermal resistance and lubricants.

Can I Use Water as Cutting Fluid?

Water boils at 100 °C, and there are no lubricant properties. When water is using a long time, there will be rusting due to interaction with the atmosphere. Due to this, water can’t be used as a cutting oil for steel.

But it can be used for the glass, tile, and concrete drilling process in order to prevent dust and improve thermal conduction.

Combined Materials

This is a common issue. When we drill into the wood, there may be part of the nail inside. When there is drilling, it can break the drill bit easier if we continue the process. I could find Best 09 Reasons and Solutions for Drill Bit Breaking

So before you drill, make sure there is no additional material inside.

High Environmental Temperature

Environmental temperature badly affects the drill and drill bit. If there is more temperature in the environment, the generated heat can leak into the environment. More than that due to these reasons your drill can be overheated.

So it tries to heat. If you use the cutting oil, this can’t be resolved. You have to stay at a low-temperature area before you start the drill.

Read More About – How to Use a Drill? Step by Step Guide!

Inner Clogging

When you drill, you can see swarfs are coming out. It can be varied with the drilling speed. If there are no cutting oils, wet condition materials can clog these swarfs inside easily. When the swarfs clog inside, they generate more heat. So drill and drill bit will be heated.

Normally you must keep 2 times drill bit diameter flute length from the top of the drill. So removed chips can be moved out easily.

You can use cutting oil to prevent inner clogging. Cutting oil has lubricant, and it will easily remove the chips to the outside. And also, do not drill wet woods. Those are clogged easily. If you drill them, do them step by step. Push and pull drilling method.