It suddenly occurred to me that I might be able to make up a cheap dado blade from 7 1/4" circular saw blades by alternating teeth alignment so that the blade bodies lay flat next to each other and the teeth overlap in their cut kerfs. It probably would require more blades than would be economical to make a 3/4 dado blade, but for 1/2" or less it might not be that bad. Would it even be safe to do?? Maybe use shims between them so it doesn't require as many?? Sometimes these blades can be bought for around $5 to $8 each here. I could put together a 1/2" dado for probably under $30. But I don't want to lose a finger or get hurt bad in the process. I have no experience with dado blades at all, so I don't know a thing about what I'm talking about doing here. Seems to me that the required amount of blades might be too heavy to turn them fast enough to work also, or could damage my saw. What are your thoughts??