Re: My first vertical milling machine
Originally Posted by
G59
Your diagram is quite correct. Adding a second ballnut reduces the available travel of that ballscrew. No one is saying it does not.
Axis travel is limited by rail travel, or ballscrew travel, whichever is shorter. In the vast majority of builds (and this one looks the same), it is rail travel that limits things. If ballscrew travel is already longer than available rail travel, adding a ballnut won't reduce axis travel. This is what everyone is saying.
Look at that picture. The X axis ballscrew travel is obviously much longer than the available rail travel (overall rail length minus bearing spacing). Adding a second nut would not reduce axis travel.
Originally Posted by
G59
Did I ever say anything about costs???
The opening poster is building a 'milling' machine out of aluminium and states use of 1605 ballscrews, steppers and a 0.75kw low cost spindle. Does that sound like a build that would / should use ground screws?
7xCNC.com - CNC info for the minilathe (7x10, 7x12, 7x14, 7x16)