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I am making a phone scanner in this DIY video. You can scan your documents, books, photos using your smartphone. An extremely simple and useful scanner stand with smartphone.
Making Video :
Go to this video's Youtube page and make a comment.
PDF Download : Document Scanner with SmartPhone PDF Plan
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.

I also added a foot pedal. The foot pedal was extremely handy. Table saw, router and jig saw is very easy to operate.