we have a gantry machine that we setup with 2 switches hooked in series for each axis. One is on the linear slide - one runs off the timing pully. When we home - the machine runs until it closes the switch on the linear slide - then because the switch are hooked in series - the switch that is activated by a tab on the timing pully is what emc sees as the home switch. pretty darn accurate.
sam On 11/24/2010 2:41 PM, Edward Bernard wrote: > So the flag could be a something like a single hall sensor and magnet as > opposed > to a quadrature encoder? > > > > ----- Original Message ---- > From: Kirk Wallace<[email protected]> > To: Enhanced Machine Controller (EMC)<[email protected]> > Sent: Wed, November 24, 2010 1:43:23 PM > Subject: Re: [Emc-users] Index Basics, OT: leaving stepppers > > On Wed, 2010-11-24 at 10:46 -0800, Edward Bernard wrote: >> What is a "screw flag". An encoder? > An encoder index or a flag that allows one to reproduce the same > position within .0005", or whatever the application calls for. I would > not trust most home switch configurations by themselves. They should be > ANDed with a sensor with a mechanical advantage, such as on the lead > screw or axis motor shaft. The home switch gets you within one turn of > the flag or index, sensing the flag gets you home. > > Currently, on my mill, I have markers on each axis. I jog each axis to > line up the makers, then watch the hand wheels and jog to line up "0" on > each dial, then I press home for each axis in AXIS. Using a home switch > could replace the markers. Using a flag or index, could replace the > dials, and allow EMC2 to automate the home sequence. When you know where > your home is, you know where your fixtures and soft limits are. ------------------------------------------------------------------------------ Increase Visibility of Your 3D Game App & Earn a Chance To Win $500! Tap into the largest installed PC base & get more eyes on your game by optimizing for Intel(R) Graphics Technology. Get started today with the Intel(R) Software Partner Program. Five $500 cash prizes are up for grabs. http://p.sf.net/sfu/intelisp-dev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
