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Some more pictures. There is a bearing bolted to the saw blade that the shaft goes thru. Moving the spacers allows for different width cuts.
Look up "Beam Machine" on Google as mine works on the same principle.
Well Egon, you are a man after my own heart. Because I live in the stone age, I build everything out of wood. I've even made wooden wheels for a log carrying cart I made 30 years ago. It looked like it came from 300 AD but it got the job done.The only difference in your contraption and what I would have made is that the guide rails wood be of wood. Nice unit and I agree is that when you reach our age, the ravages of time fall upon us in not so nice ways. What I see in the mirror now is this old man that ate the young man I was used to seeing.