On 29 May 2013 18:49, Leonardo Marsaglia <leonardomarsagli...@gmail.com> wrote:
> Anyway I don't see too much room for a linear motor since the machine now > has a piston, I don't know if there is in existance a linear servo motor > with the shape of a piston, all circular or something like that, they must > exist anyway. There are voice-coil servos, but I doubt they have enough force. I would actually be tempted to try a servo motor and crank on top of a conventional X-axis. In a rare move away from CNC, the crank throw would probably need to be manually adjusted to suit the total cam lift. For a simple eccentric this would only need to rotate at constant speed in exact phase with the spindle. As your cam profile deviates from the simple eccentric, then the relationship between the angular position of the two motors needs to be modified. Here is a HAL component that could apply this modification: http://www.linuxcnc.org/docs/devel/html/man/man9/lincurve.9.html It isn't ideal as it stands, it would need to be able to read cam profiles in from a data file. I think that mechanically this is a lot less challenging for the servo and controllers, the motor never changes direction, it just slows down and speeds up relative to the spindle. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto ------------------------------------------------------------------------------ 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
