On Sat, Jul 21, 2012, at 06:04 PM, Jeshua Lacock wrote: > > Damn. Anyone want to buy two brand new ballscrews? > > :D > > Maybe I will use them on a laser cutter instead. High speed is not as > important to me on a laser cutter as it is on a 3D milling machine. Path > lengths are *much* longer doing 3D stuff versus 2D cutting…. > > Maybe I will use timing belts for this machine. Just seems like they will > have a lot of flex over a 10 foot span. Chain drive?
I saw an idea once that attempted to solve the problem of timing belt stretch by attaching one belt along its full length to the machine frame, then meshing another belt to that one to drive the axis. A picture is worth a thousand words, see this posting: http://www.mycncuk.com/forums/showthread.php/1599-Planning-and-build-of-my-8020-aluminium-CNC-Router?p=10463&viewfull=1#post10463 It essentially becomes a rack-and-pinion of sorts. I didn't read that full thread to see if he actually built the machine, and how it worked out. I think I also saw the same idea discussed on CNCzone. Of course, you could also just go the rack-and-pinion route. The rack teeth should point down to shed dirt and chips. -- John Kasunich jmkasun...@fastmail.fm ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users