Cutting a 45 Degree Angle with a Table Saw

Occasionally, a proper 45-degree angle is essential when woodworking. The accuracy comes along in the way when you working on a project require ideally 45 angle cuts with no mistake at all.

Thinking of having a perfect 45 cut seems complicated if you’ve never done this before. But, in reality, it’s not!. Here in this blog, I’ll tell you my personal ways to set a blade to 45 degrees with maximum accuracy ensured.

Now, there are multiple ways to get 45-degree cuts. We’ll talk about the easiest ones here.

1)  Use 45 Degree Scale

This method is suitable to double-check the measurement for table saws that already have a scale to move the blade to 45” to 90.” Precisely if you’ve tried the size and found the built-in scale is not accurate. In that case, a Triangle scale can give you the most precise reading.

Pick a 45-degree scale measure and rest it on the table, clear the surface to ensure inaccurate measurements. Afterward, push it towards the blade in such a way its Hypotenuse side makes an angle while its base should be in parallel contact with the table’s surface.

You can reference the image shown above.

Now set the blade position as the same as the triangle. Both the blade and the angle should make the same angle, which will undoubtedly be 45 degrees. Try beveling a cut this time with the same angle, and you will be amazed at the accuracy.

Use a Digital Angle Gauge

There are helpful Digital angle gages available on the market that help to find and measuring an angle quickly with a certain level of accuracy. With magnets fit at their bottom, you only need to place them over a blade, and on the digital-analog, read the angle measures.

Regardless of which side your Mother’s blade tilts, bring the back of the tool closer to the blade and let it stick together. Keep the screen side in front of you. Now tilt your blade, and have an eye for the readings. At 45 degrees, stop leaning the blade.

Although these kinds of tools make it easier to find an angle, genuinely speaking, there is some inaccuracy in measurements. In general, around 0.2 (+,_) is noticed in most of these gadgets.

That is not really a matter of discerning as long as you’re working on a simple wood project.

On the other hand, professionals usually want to finish their work just to make their project stand out and look stunning. With that being said, this 0.2 angle is too much for them.

Never mind, there are now accurate angle digital finders that trade accuracy with more money.

You can read it also How to plane wood without a planer

Manually cut a 45-degree angle with a table saw.

To begin with, take a smooth piece of wood/board and cut it 22 inches long using a table saw.

Fence 1 board 13 inches long and make it two pieces, each ¾ inches wider for reference. See the image below. Later we’ll join them and put them over on the board we had cut 22 inches.

Now mark the side of the board that is 11 inches from my sense to line it up with it. Use a scale to find out the center and with a marker, make the centric position which should be 11 inches as the board’s size is 22 inches. It’s going to be the mainboard in which we’ll attach the rails. See below

Put some glue over the rails and place the board onto it. Alignment is crucial here, make sure they should be parallel. In the image below, you can see, I’ve used table saw’s holes which were long enough to fit the rails over there. Also, in order to make a strong joint, I’ve placed some washers beneath the rails. Not necessarily. You can just glue them.

Once this is done, wait for the glue to get dried properly.

Next cut two 13 inch boards for the 45-degree jig. They both will work as a scale to measure a 45 degree, surely will be placed over the mainboard. Keep following the steps to see how this will do the trick!

Once you get the two boards cut, with the same measurement of 13 inches long, now drill some pocket holes to hold it to the main board of the jig.

Once you get that board cut, glue them in their ends and attach them together by their heads. This is because we want to make it look like a triangle. In the next step, we’ll use a triangle to measure the shape.

Use a 45-degree jig to just make sure the pores are perfectly aligned. Before that, you can see it in the image. I’ve drawn a centric line because the top corner of the shape we’ve just made, should be placed there.

The next step is to make a cut right between the center. It’s because when slicing a wood piece into a 45-degree cut. The pre-cut provides accuracy in cutting.

Finally, put a wood piece on the table saw. And push the frame in line with the pre-cut that we have made earlier. It works like a scale. See the below image.

The final result will look like this, a perfect 45 degree cut.

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