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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!
I have a sensitive drill press with a stationary spindle.
All the smallest sizes I do ( so far 0.6mm ~24mil = 0.024") - is on the Table CNC @ Work. My experince here is that the higher the RPM the smaller the chance of a broken Drill-Bit (not that it happens very often anyway).The slower the RPM or Feed -> the more the Bit wanders before starting the Hole (@ the surface).But as mentioned - it is not required to be fast ....Roger - I do not know how small you can get them (I see 0.1mm ~3.9mil=0.0039") - but have a look after 1/8" / 3.175mm shank VHM Drill-Bits for PCB manufacturing. The cheapest are from AliExpress, are ok - the Best are from a few German Manufactors (that I can't find right now) .... Per
Nice drill press Is that a home built?Dave