I've bought a cnc-lathe!
Well, it's not complete, more of a cnc-lathe project.
A fellow Finnish cnc'er "JHQ" started this project a few years ago, but as he now has a 5000 kg professional cnc-lathe and his own company, he hasn't had time/money to complete this project. There are many project logs out there with details of how the machine was designed and built:
Some notes of my own, as I unpacked everything today.
Stepper motors are NEMA23 size with 10 mm diameter shafts (ca 20 mm long). I will most probably not use stepper-motors but NEMA23-size brushless servos instead. The X-ballscrew is 16mm diameter with 4mm lead. It is 158mm long while the nut is 37mm long. That makes for a theoretical max travel of 121mm (enough?). The timing belt pulleys for both Z- and X-axes are type 21T5-36 and 21T5-21 or 21T5-16. That makes for a 1:1.7 or 1:2.25 reduction ratio. The Z-ballscrew is ca 30mm diameter with a 5mm lead (might be 0.2" also). It is 545mm long, the nut is 63mm long, theoretical travel 482mm.
The chip-guard is ca 450-460mm wide and around 185mm long when fully compressed. It extends to much longer than required. The Z-rails are HSR25 type and the X-rails are HSR20 type (length 340mm). The Z-saddle-plate is 380x195x15.3mm. The X-saddle-plate is 275x227x20.4mm.
The coolant pump is rated as 24V/3.5A. There is a transformer with a 24V/3.5A secondary for powering the coolant pump.
The spindle servo is rated at 1.75kW, 3000rpm, 13A, and 7Nm. The spindle servo axis is 19mm in diameter and ca 35mm long. The spindle itself is 45mm in outer diameter where the pulley for the belt-drive should attach. The chuck-holder is 100mm in diameter.
These images are also on picasa: http://picasaweb.google.fi/anders.e.e.wallin/JHQLathe2009_11_21#