The maximum lift we are machining is about 12 mm and maximum diameter is about 45mm . And may be some eccentrics on some camshafts but nothing too big.
The subject I am worried about the most is the one about how to generate the g-code, because if I want the X axis to follow the profile on the cam but with acceleration and velocity values, like the diagrams of a real cam (lobe), then it's a little tricky. For that I would need to make some programming on hal because that would be handled directly from the PID loop. Also I need to capture the exact shape of the cam, that's not that tricky. About the roughing pass, that would be much more easy since I can generate the profile in a cam software and compensate the radius of the circular mill to make the shape. About the hydraulics, yes, I think using a servo motor would be the best. Mordern landis machines use powerful linear servo motors but I think that a ballscrew that has one or two cents of a milimeter will do just fine for the job. 2013/5/29 Dave <e...@dc9.tzo.com> > Doing that with hydraulics would be very, very expensive compared to an > electric servo. You would need a constant pressure pump, accumulator, > and a very expensive servo valve to get that > kind of speed. Big $. > > Dave Cole > > On 5/29/2013 12:18 PM, Leonardo Marsaglia wrote: > > Yes, thinking it fast I assume that a 4 kw servo motor and ballscrew will > > do it. Also there's the possibility of using the same hydraulic piston > that > > the machine has but with a servo valve and a linear way. I've seen that a > > guy here on the list did that to a intetrior grinding machine and It > worked > > pretty well, but this is not the same kind of movement, he only used the > Z > > axis to make the plunge. > > > > > > 2013/5/29 Les Newell<les.new...@fastmail.co.uk> > > > > > >> I don't see any problems with that sort of spindle speed. The normal PID > >> loops will maintain pretty good tolerance. If your X axis is heavy you > >> will need a reasonably powerful motor to provide the acceleration. > >> > >> Les > >> > >> On 29/05/2013 13:36, Leonardo Marsaglia wrote: > >> > >>> About 120 RPM for the first tenths of milimeter, and then 50 rpm for > the > >>> last turns to finish it. This machine has no VFD, it uses a two speed > >>> electric motor and I use it as it was originally. I can make it go > >>> > >> faster, > >> > >>> but approximately that's the velocity I use to make them based on the > >>> diameters I use. > >>> > >>> > >> > >> > >> > ------------------------------------------------------------------------------ > >> Introducing AppDynamics Lite, a free troubleshooting tool for Java/.NET > >> Get 100% visibility into your production application - at no cost. > >> Code-level diagnostics for performance bottlenecks with<2% overhead > >> Download for free and get started troubleshooting in minutes. > >> http://p.sf.net/sfu/appdyn_d2d_ap1 > >> _______________________________________________ > >> Emc-users mailing list > >> Emc-users@lists.sourceforge.net > >> https://lists.sourceforge.net/lists/listinfo/emc-users > >> > >> > > > > > > > > > > ------------------------------------------------------------------------------ > Introducing AppDynamics Lite, a free troubleshooting tool for Java/.NET > Get 100% visibility into your production application - at no cost. > Code-level diagnostics for performance bottlenecks with <2% overhead > Download for free and get started troubleshooting in minutes. > http://p.sf.net/sfu/appdyn_d2d_ap1 > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- *Leonardo Marsaglia*. ------------------------------------------------------------------------------ Introducing AppDynamics Lite, a free troubleshooting tool for Java/.NET Get 100% visibility into your production application - at no cost. Code-level diagnostics for performance bottlenecks with <2% overhead Download for free and get started troubleshooting in minutes. http://p.sf.net/sfu/appdyn_d2d_ap1 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
