Thanks for the input Hackman,
I dont think there is any doubt about using a 0.1 pitch ballscrew on my Z axis. It would make no sense to use 0.2 pitch and then gear down. This will also increase accuracy because of the direct drive.
Before I can decide on the X & Y I need to find out what is likely to be my max feed speed required and a nice rapid so will need to do some research on that first. Hopefully the max will allow me to use the 0.1 pitch for all axes. This will mainly depend on how fast a 3Nm (420+ oz in) stepper can drive a 0.1 pitch ballscrew on my X as I think it would be fine to use it 0.1 on my Y as it is such a small distance of travel.
As already mentioned I have has 1000mm/min (39/min) feeds with lots of torque and rapid of up to 2100mm/min (82/min) on my X using the stock 1.5mm (0.059)lead screw. If these numbers are good for general hobby milling then the 0.1 pitch it will be.
If anyone notices any dodgy thinking here or has better advice please feel free to jump in. Or would like to give me some number for recommended max feed and rapid speeds for a hobby mill with max 3000RPM spindle it would be most appreciated.
Thanks all again for the help,
John  |