Dave Caroline wrote: > On Wed, Jan 25, 2012 at 12:38 PM, Lester Caine<[email protected]> wrote: >> > John Prentice wrote: >>> >> From: "John Thornton"<[email protected]> >>>> >>> IIRC Jeff Eppler cut a fusee for a mousetrap powered car... >>> >> >>> >> Sadly a fusee for clock work needs a curved profile to match spring >>> >> forces >>> >> rather than straight line. >>> >> >>> >> I think they are hard to cut on a CNC lathe although reasonably easy to >>> >> mill >>> >> with a 4th axis - apart from the required overhang on a small diameter >>> >> mill. >> > >> > Like this? >> > >> > http://medw.co.uk/fisheye/view_image.php?image_id=532&gallery_path=/23/92/37 > Yes like that but a correctly cut fusee on an antique clock does not > have lead in/out ramps > but stop sharply at the chain/rope mounting usually. Probably easier to mill. > Somewhere I have the maths for the curve but cant find at the moment.
This is milled - 2mm end mill for a square chain. If you look at the next picture you will see the pocket for the end of the chain. Shape is 'rule of thumb' ... but don't ask me who's thumb it was :) -- Lester Caine - G8HFL ----------------------------- Contact - http://lsces.co.uk/wiki/?page=contact L.S.Caine Electronic Services - http://lsces.co.uk EnquirySolve - http://enquirysolve.com/ Model Engineers Digital Workshop - http://medw.co.uk// Firebird - http://www.firebirdsql.org/index.php ------------------------------------------------------------------------------ Keep Your Developer Skills Current with LearnDevNow! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-d2d _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
