On Sun, 2010-11-07 at 09:11 -0500, Ed wrote: ... snip > Both cables are shielded and drained 6 twisted pair for a total of > 12 leads per cable. Questions:Can I run the axis encoder in the same > cable as the turret encoder? The turret runs at 12Volts logic, will this > cause any crosstalk?
I reused my Hardinge cables on my HNC, which I think are straight, unpaired with an overall shield. I have the axis and turret encoder signals running through the same cable, with the turret encoder running on 12 Volts. It seems to work fine. You might consider looking into methods of terminating the wire pairs. Such as impedance matching resistors, although this may be more appropriate for differential signaling. http://www.epanorama.net/documents/wiring/cable_impedance.html http://en.wikipedia.org/wiki/Twisted_pair http://www.maxim-ic.com/app-notes/index.mvp/id/763/CMP/WP-1 > How did Hardinge do threading with a resolver on > the spindle? I cannot find an index mechanism or any extra leads that > would go to one. The spindle resolver is still in place but can be > replaced easily with an encoder with index. I believe the resolver is an absolute encoder so the index feature is inherent. http://en.wikipedia.org/wiki/Resolver_%28electrical%29 I replaced my spindle resolver and tachometer with a quadrature encoder. http://www.wallacecompany.com/cnc_lathe/HNC/00011-1a.jpg I had problems with interference on the index signal, which I cleared up with a mains filter on the spindle VFD. You can see more here: http://www.wallacecompany.com/cnc_lathe/HNC/ > The plan is to fit this all > up with Pico Systems PWM controller which I have at hand and if needs be > I have an extra Par port card for extra I/O. Ed. That's the setup I have. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ The Next 800 Companies to Lead America's Growth: New Video Whitepaper David G. Thomson, author of the best-selling book "Blueprint to a Billion" shares his insights and actions to help propel your business during the next growth cycle. Listen Now! http://p.sf.net/sfu/SAP-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
