On 9/28/2014 7:54 PM, andy pugh wrote: > So, I started thinking, and it occurred to me that whilst the > traditional lathe solution to the fact that the leadscrew is offset > from the point of action of the tool is to have a saddle with long > wings, you could have a short saddle that only controls in X with dual > ballscrews to keep X perpendicular to Z.
I saw a dual leadscrew lathe on an online auction but didn't get the pictures saved before it ended. It had one screw on each side of the bed, with a large pair of gears at the headstock end to connect them together. The rear one would have been left hand thread. Another way to do it would be to use an idler gear between so they could both be right hand thread. Even better would be to gear both ends together. Wouldn't have any twist or racking of the saddle. A setup like that is how precision screws used to be made. Cut two on a lathe then put them into the precision machine and cut two more to replace the first two. Inaccuracies average out and after a few iterations the machine is cutting very precise screws and can be used to cut them for other applications. --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com ------------------------------------------------------------------------------ Slashdot TV. Videos for Nerds. Stuff that Matters. http://pubads.g.doubleclick.net/gampad/clk?id=160591471&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
