On Jul 21, 2012, at 6:24 PM, John Kasunich wrote: > n 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.
Interesting. Yeah, looks like he never built it - or at least reported back. > Of course, you could also just go the rack-and-pinion route. > The rack teeth should point down to shed dirt and chips. I don't recall the specifics, but I read somewhere that rack-and-pinon was not a good solution. Maybe it had something to do with resonance? Cheers, Jeshua Lacock Founder/Engineer 3DTOPO Incorporated <http://3DTOPO.com> Phone: 208.462.4171 ------------------------------------------------------------------------------ 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
