Why is My Circular Saw not Cutting Straight? – Fixed Easy!

A Circular saw is one of the most used saw in woodworking. We can observe so many problems when we use a circular saw in day-to-day activities. If you buy a new circular saw or if you are a newbie for woodworking, as a first time using a circular saw, you can see your cutting is not straight as you wish. But it is not a serious problem. You can fix it quickly after referring to this guide until the end.

A circular saw is not cutting straight due to poor saw blade, sliding workpiece, warper saw blade, loose or dirty blade, and less practice and experience of the user. A straight cutting problem can fix easily by using a proper saw blade, lower cutting speed, clamped workpiece, and proper skills.

These factors are the reasons, but there are also many reasons for the circular saw not cutting straight. So let’s see, what are the reasons and solutions for the circular saw not cutting straight step by step.

12 Types Drill Bit for Wood
12 Types Drill Bit for Wood

Importance of Circular Saw Straight Cutting

Typically, straight cutting is essential in woodworking. Not only straight cutting but also clean cutting is really worth it. If the workpiece is not cutting straight, we have to replace a new workpiece or work more time on the workpiece to make it straight. It will be a waste of time, workpiece, power, money, and many more. So it is important to have a straight workpiece every time when we are working.

If you are a newbie to woodworking, you may not be able to cut straight workpieces your first time. But do not rush experience, and time will prepare you as a pro. So neglect workpiece and machine hours at your first time.

07 Reasons for Circular Saw not Cutting Straight Workpiece

This is the essential thing that you should know. Before fixing the problem, we must know the reasons. According to the experience, I could gather many reasons. So if you have such a problem, check whether you have one of these reasons. So it will be easy to fix the problem.

01. Less User Experience and Practise

This is a very important thing that we must keep in mind. The first time we use a circular saw, we will not be able to use it like a pro. Its noise, vibration, weight are not compatible with us. I remember my first time using a circular saw. It vibrated the side of my body. But after using it several times, I could cope with the tool.

When you try to straight cut at your first time it will be crooks and curved. Sometimes cutting path looks like a snake. So don’t worry, time will fix everything. Nobody does it as a professional user for the first time. Sometimes you may need to throw away a few workpieces. But those will be an investment for the future time and money. Don’t worry about it.

Wisdom comes with age and experience. You can’t buy it or rush it, you need to earn it, slowly, over time. The years of experience a woodworker has often shown up in the color of their hair. Their face has probably turned that same color a few times also!

But as a newbie, you should be careful about safety. You must always follow the proper safety guidelines in order to you and tool safety.

Read More About – Top 05 Circular Saw Problems and Solutions

02. Low Quality Saw Blade

Saw blade quality is very important for the perfect cutting process. The quality of the saw blade cannot identify by the visibility. You have to use it for confirmation. Imagine if you buy a cheap circular saw with a saw blade, probably saw blade will be cheaper and lower quality.

You can observe it by using it. Some circular blades that come with circular saws are not good. Frankly, those can use one or two times. One of my friends bought a circular saw for 50$. When it used to cut the workpiece, it was not straight and after a few cutting, we could see blunt saw teeth.

  • A high-quality saw blade doesn’t scrimp on carbide or steel. It has been made with long-life materials and teeth have been designed as it resharpened many times.
  • Low-quality saw blades are made with thin stamped steel plates. Expansion slots end bluntly in open holes signal old technology and a noisy blade.

03. Sliding Workpiece

When we cut, the workpiece should be fixed; when it moves here and there, we can’t cut it. This is common for any sawing and drilling process. If the workpiece is sliding, you cant cut it properly. Sometimes you can see kickback and binding in the workpiece. Due to binding the workpiece, we can see burning marks on the workpiece.

If the workpiece is not stable, you can use a clamp to fix its side. You can find any size of the clamp in the market. If you are not able to use a clamp, ask someone to tightly fix it until you cut it. More than that you can screw desired points as it does not move here and there. But it is not a recommended way.

And remember, when you clamp the workpiece, make sure to use a way, as it is not binding with the saw blade.

04. Loose Circular Saw Blade

When a circular saw is used for a long time, the saw blade holding nut can be loosened. As a result of this saw arbor cant carry the saw blade on the correct path. This will cause to misalign the saw blade. Finally, we can observe saw blade is sping with a wobble. As a result of this, we cant move the saw blade on the correct path. And also, we can see the kerf path is wider than the blade thickness.

Normally, the saw blade is tightened counterclockwise to make the blade lose from the arbor. Hence it is easy to tighten the saw blade.

05. Warped Saw Blade

A poor-quality saw blade can be warped due to its low-quality material. Normally saw blades are made with tough materials such as tungsten, carbide, etc. To minimize the production cost, manufacturers use low-quality materials. So it is better to select the right saw blade for your project.

As a result of this saw, blade strength is reduced, and it can be damaged easily. When the hardwood or sudden metal part is cut it will be a blunt blade. And also, these kinds of saw blades can bend easily. Not only bend those can dirt easily due to outer surface material.

Once this is damaged, it is not able to use again.

If you use such a saw blade, you have to maintain the saw blade regularly.

06. Circular Saw Blade is not Parallel to the Edge of the Base

If the blade is pointed towards the edge, then it would press the saw harder against the guide, and assuming the guide is secure and doesn’t flex, this would get a straight line but a wider kerf.

If it is pointed away from the edge, then it would want to pull the saw away from the guide. In that case, you would have to use your arm strength to keep it against the guide (or twist the saw a little). That makes it a challenge to keep it against the guide.

07. Fast Feeding

When you cut using the circular saw, you should not be rushed. If you rush, you will not be able to cut along the cutting path it will move here and there. The result will be a crook cutting path. So be calm and wear the essential safety instruments such as goggles, hearing protection equipment and wear blouse then start the work without any stress and hurry.

When your feeding rate is high, chips can be clogged inside the kerf. As a result of this, we can see smoking from the workpiece. So always use the correct and sufficient feeding speed.

A calm mind will lead a proper and perfect work every time.

How to Fix Circular Saw not Cutting Straight?

Replace a Warped Saw Blade

Most of the warped saw blades are not able to use for straight cuttings. If a saw blade is damaged due to sudden flexibilities, it is difficult to fix it completely, even a slight bending or abnormal spinning in the saw blade. This behavior can be observed in the low-quality cheap saw blades.

Warped Saw Blade

You can identify the saw blade before it is tight to the circular saw. Just keep the saw blade on the flat surface. If the saw blade surface completely touches the flat surface, it will be a perfect flat blade.

If some part of the saw blade touches the surface at a time will be a sign of the warped saw blade. Hence it should not be tight to the circular saw. It will avoid straight cutting in the circular saw.


Fix Saw Blad With Proper Alignments

Alignment is an essential thing we must consider in the circular saw blade. A proper circular saw blade should be well flat and have sufficient strength. It can fix the arbor by tightening the outer flange and tightening the nut. When you tighten the saw blade make sure the inner flange, arbor, outer flange, washers are with proper quality and free of surface damage.

**Blade alignment does not affect much to the straight cutting much. Due to the wrong blade alignment blade can be wobble. As a result of this, we can see wider kerf.


Use Saw Track or Rail Guide

In order to cut straight, you can use a saw track or fence. These tools are not the same.

Saw Track

Saw tracks can hold the circular saw shoe on the holding panel. Using screws, you can tight the circular saw withholding panel well. Then holding panel can move on the tracks smoothly. A saw track is about 50″ in length. Hence it can use for the long-cutting purpose.

You have to align the cutting point and place the saw track on it. Then switch on the circular and then slowly cut the workpiece.

Kreg is a leading manufacturer of the saw track industry. We can see Kreg rip cut and Kreg Accu cuts.

Use Kreg Rip-Cut

Normally Kreg rip cut is used as the short circular saw guide. It can cut 24″ in length rip cuts easily. Due to the lightweight 2.45 lbs, it can be handled easily, and it will cost about 35$-45$

Kreg Accu cut and Kreg Rip cut

Use Kreg Accu Cut

Kreg Accu cut is designed for the long accurate cuts such as 48″ in plywood. Due to the length, this is a bit difficult to use for the smaller workpiece. It is suitable for large workpieces.

Saw Fence

Saw Guide Image Source – Quora.com

Saw fence is another tool used for straight cutting. The saw fence will act as a guide. It can clamp two sides of the ends. Then circular saw show can move along the saw guide. You just need to push along the guide edge. Then saw blade will move along the saw guide.


Clamp the Workpiece

This is a simple task. You can use clamps for tightening the workpiece with the table or platform. When you use a clamp make sure the clamp does not block the cutting path. You can buy any size of clamp from the market.

If there is no clamp, ask someone to tight well. Then you can cut along the cutting line path.

Use a Speed Square

Use speed square for straight cutting

A speed square is made with metal, and it is really suitable as a short guide. If you have to cut less than 8 inches, you can use a speed square as a guide fence. According to your requirements, you can buy a 7″-12″ speed square in the market. This a very useful tool that you should have.

Tom Mackenzy

I am Tom, I am really interested in DIY projects. I have my own workshop and I spend my free time with so many projects. So I would like to share my experience with you regarding power tools, woodworking, metalworking, etc.

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