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Have you seen the construction of this machine?
Drum Sander - Thickness Sander Making Video & PDF Dimensions
I updated my Drum Sander. This drum sander now has a motorized slide. No need to use your hands anymore to push and pull. Sanding any woods easly. You can download the gears template (PDF). Print it 100% scale. I used for print the chrome browser.
Making Video :
Go to this video's Youtube page and make a comment.
PDF Download : Drum Sander Motorized Feed Mechanizm
In this video, I make an adjustable drill bit. I start by using the metal I cut from the M12 bolt. Then I am cutting a Spade Drill Bit. Then I combine the two.

After watching this video, you can download the free PDF document and make it easily. There are many 90 degree corner clamp videos on youtube. But this is a little differ