On Thu, Jun 2, 2016, at 09:45 AM, andy pugh wrote: > On 2 June 2016 at 14:15, John Kasunich <jmkasun...@fastmail.fm> wrote: > > Unless this is a mighty slow lathe, I don't think chain is the > > appropriate drive mechanism. > > Silent chain has been used on a number of lathes historically: > http://www.lathes.co.uk/southbend/page12.html
That South Bend installation had a recommended motor speed of 900 RPM. Gene's lathe uses a motor that I think runs 4000 RPM. My Van Norman mill used a silent chain from the 1/4 HP 1800 RPM feed motor to the input shaft of the feed gearbox. Pulley and chain were both worn and the chain would climb out of the teeth and skip. There was enough meat on the large pulley that I could turn off the silent-chain teeth and re-cut XL timing belt teeth. I put an off-the-shelf XL pulley on the motor and back in service. > > And the cam-chain in my motorcycle runs up to 14,000 rpm. > Fully enclosed and oil lubricated. And properly engineered for the task. > A conventional roller chain might well not be as smooth as one might > like in a lathe application, though. > > I haven't posted this here yet: > https://www.youtube.com/watch?v=woU927Tqoo8 > This is my current project, which is using motorcycle cam-chains to > drive the ball screws as an experiment. How fast do the ballscrews turn? I don't doubt that a chain could be made to work, but on a lathe as small as Gene's I think it is far from the ideal solution. -- John Kasunich jmkasun...@fastmail.fm ------------------------------------------------------------------------------ What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic patterns at an interface-level. Reveals which users, apps, and protocols are consuming the most bandwidth. Provides multi-vendor support for NetFlow, J-Flow, sFlow and other flows. Make informed decisions using capacity planning reports. https://ad.doubleclick.net/ddm/clk/305295220;132659582;e _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
