Another tool on the list of tools to make so that I can make the tools needed to make more tools. This one is pretty simple though. Grabbed some ~30mm bar that I had lying around and turned a 20mm length at one end to exactly 22mm (the diameter of the holes in my saw blades). The corner radius had to be relieved by cutting into the face rather than the diameter, so that very thin (<0.5mm) saw blades could still register on the shaft accurately. https://pic8.co/sh/Sp5GWg.jpg About 50mm of shaft was then turned down to a nominal 20mm to fit in my largest ER32 collet. This was then cut off the main bar leaving ~60mm of arbor body and chucked up in a 5C collet in the lathe to get as much concentricity as possible. The end of the arbor was faced, drilled out to 8.5mm (for tapping M10) and then counterbored to a depth of 20.5mm and a diameter of ~22.05mm so that the earlier turned slug would be a close sliding fit and would seat all the way in. https://pic8.co/sh/cMVdZI.jpg The slug was drilled out to 10mm, then counter bored to 15.5mm diameter x 10.5mm depth for clearance for the socket head screw head. The head flange was turned down to ~3mm thick and a generous bevel put on the end. This could then be bolted to the main arbor for final OD turning. The OD was turned to clean up the rusty original surface, it was then sanded with 80grit emry to a smooth finish. https://pic8.co/sh/Nt0ev6.jpg https://pic8.co/sh/R3fvqj.jpg That's pretty much it. Just two pieces turned on the lathe and a screw I had lying around. https://pic8.co/sh/KxF8Uf.jpg The blade is held in with minimal runout (it's not perfect though) and very low clearance at the bottom. https://pic8.co/sh/1x1n4o.jpg https://pic8.co/sh/1yaFx6.jpg Got a chance to test it out. I was trying to get 2 12mm wide pieces from a short length of bar...but the bar was only 25mm wide. That left only 1mm for cleanup of the rough mill finish (it's hot rolled bar) edges and the saw kerf from cutting down the middle. So, I figured I'd give the 0.5mm blade a try. Set it up, fucked around a bit trying to figure out if I was in the right spot, then made the cut. It went through with minimal issues just using some random hydraulic oil as a lubricant/coolant. The cut drifted slightly upward by 0.2mm over the 65mm length of the cut, which is something to keep in mind, perhaps I should make a shallow initial guiding cut for any long or critical cuts. I set it up to cut 5.8mm into the 6.00mm thick stock, which left a narrow bridge of metal holding the two parts that I could easily bend and snap off. In the end I just managed to get 2 12mm wide (at least on some part) peices, these might pop up again in the future. https://pic8.co/sh/drmXMs.jpg