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Thanks All. Interesting points all.I was just using a bit of steel I had on the shelf that was dimensionally close. Now I know how horrible it is it's getting tossed. I've used 12L14 - lovely stuff - if I can find it in the size I need, 4130, 4140 but that's a bit tough. I was trying to make a 4" adapter plate out of 4130 when I fried my lathe motor.... I'll take a look at the 1144SP and see if it's available.10,000 RPM is a bit excessive for my machines! 2500RPM is my limit on the mill. This will be a learning curve.I don't know anything about the #55. I assume it's a discontinued model, but I'll find out when I get my hands on it and report back.I did see Joe Pie's video after I discovered the posts about the attachment. I would have made one and gone down that road, but I need it on the mill.0.1mm is ridiculously small! I could barely see that without a microscope, let alone try to drill it!