True, I find myself drawing 90 and 45 degree lines with a Sharpie as a guide. I am making a welding table right now, this sander is great for beveling and de-burring on each end of many pieces.Nice job. I use mine all the time. Great way for fast stock removal and quick radius’s. A nice little project would be to make a adjustable angle plate for the t slot so your perpendicular to belt face.