On 06/12/2013 04:43 PM, andy pugh wrote: ... snip > So, I have concluded that what I need is a conventional lathe, with a > large spindle bore, a set of rests, and that will fit in a small > space. In fact what I need is probably a Harrison M250, or better > still the M280 CNC trainer version. ... snip > > I don't have any of the changewheel or screwcutting gearbox parts > (other than the quadrant). Finding the parts seems unlikely, certainly > at a sensible cost.
Making the gears and other bits should not take a lot of magic. It becomes a machining project instead of a software/electronics project. > What would make a lot of sense would be to replace the original > changewheel arrangement with an electronic leadscrew drive. (this > could easily be a second motor inside the cabinet, and a toothed belt > drive, and would be effectively invisible. This could be nothing more > than an Arduino with an LCD display. Add three gear-tooth sensors > inside the backgear cover, and the machine suddenly becomes quite > useful. (Though I am also short of a threading indicator) The ELS controllers I found: http://www.autoartisans.com/ELS/ http://www.cnccookbook.com/MTLatheElecLeadMockDocs.htm don't need a threading indicator, as far as I can tell. -- Kirk http://www.wallacecompany.com/machine_shop/index.html ------------------------------------------------------------------------------ This SF.net email is sponsored by Windows: Build for Windows Store. http://p.sf.net/sfu/windows-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
