King Midas mill conversion

[diy-john]

Robin, tried to understand how things would go on the ball screw. Now, this is getting to the far edge of my knowledge, this is all new.

Made a sketch of how I have understood:




So, starting from the right hand side, in the picture, requirements for machining screw:

- Machine 12mm length of screw to 10mm diameter (if want a bearing at the far end of the screw). Moving further from right to left, add

I put on one bearing <--- 1 bearing, shaft=12mm, OD=32mm, W=15.9mm, like this http://3.bp.blogspot.com/_3D8MX6Q_YG...G_0326+sml.jpg so machine ballscrew width=15.9mm diameter=12mm
the aluminium mount that bolts to the machine <--- For this, machine 3mm length of ballscrew diameter=12mm. Bearings will go mostly inside this mount(?)
then another bearing <--- machine ballscrew width=15.9mm diameter=12mm
then a pair of Belleville washers <--- like this http://www.trakar.com/spring-trainin...rings/disc.jpg machine 2mm length of ball screw to diameter = 12mm
then the pulley <--- machine total width of pulley (eg. 25mm) diameter = 12mm + flat spot
then a stepped iron sleeve to carry the indicator dial and the handle <--- machine total width of pulley (eg. 25mm) diameter = 12mm + flat spot
then a 12mm half nut <--- machine a thread M12 x 1mm to the end of the screw, perhaps for a length of 10mm

OR: machine the screw like this:
http://www.slidesandballscrews.com/images/machining ball screw-1100mm.jpg
- Except no.1 : that there would be a longer piece of screw machined to 12mm diameter (perhaps 35.8 mm length instead of 23mm in picture, to allow 2 x bearings (30.8 mm) + bearing housing (3mm) + belleville washers (2mm) = 35.8mm
- Except no.2 : Make a 12mm "flat spot of 50mm length" (to take pulley and handwheel)


For now, this project focus is trying to understand requirements: how / to what specification machine ballscrews.

Please comment!

Thanks!