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This tool is great if you want to make precise 45 degree cuts with your table saw. You can find the video on my youtube channel below. I also make a simple frame in the video.
Making Video :
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PDF Download : Table Saw Miter Sled
Did you see this ? Table Saw Crosscut Sled
You can use it both to drill 90 degree holes and to drill holes in the depth you want. It also works for joining two woods together, you can see in the video.

How to a make marking tool. 2 in 1 wood tool. Beam compass tool and marking gauge. Simple, homemade. You can mark to cut wood in the middle. You can draw a parallel line.