On Friday 20 September 2013 03:07:41 propcoder did opine: > I set up spindle gear sensor on a metal milling machine with steppers. > Will one sensor be enough for G33?
I don't think so. You need 3 sensors, 2 adjusted for A/B in quadrature so it can track direction of spindle since any rigid tapping operation will need to follow the spindle as it reverses to back the tap back out of the hole. The 3rd sensor, the index pulse generator establishes the start point on a synchronized move, and works well as long as the spindle speed is steady. Because of the acceleration delays in bringing the axis chosen up to speed from its parking position, the spindle speed cannot be adjusted in the middle of a G76 or G33.1 cycle without the thread moving sideways just enough to muck it up. BTDT. :( > I thought I can make synthetic index signal in HAL. I can use my own > additional component or maybe correct encoder component.. Somebody went > this way already? I have read of folks doing that, maybe for a one off job, but have never been able to believe it would work the same way every time you turn the morning lights on. > Before I do this I would like to know whether / when hardware index is > needed? For any G76 or G33 function to be 100% reliable you will need one. > G33 manual says it can sync X, Y, Z axes with spindle. What if I want to > sync A (rotary) axis to spindle? It had better be at least 1000x faster than mine. :) Its a slow poke. I would assume it would work, or throw an error on loading the code. I've never tried it. > What K value to use when several axes are in one line with G33? This multiple axis synch is untested territory for me. Once you have an index pulse, code like this can probably be tested from the MDI interface, turning the spindle by hand with spindle power off. Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://gene.homelinux.net:6309/gene> should be up! BOFH excuse #97: Small animal kamikaze attack on power supplies A pen in the hand of this president is far more dangerous than 200 million guns in the hands of law-abiding citizens. ------------------------------------------------------------------------------ LIMITED TIME SALE - Full Year of Microsoft Training For Just $49.99! 1,500+ hours of tutorials including VisualStudio 2012, Windows 8, SharePoint 2013, SQL 2012, MVC 4, more. BEST VALUE: New Multi-Library Power Pack includes Mobile, Cloud, Java, and UX Design. Lowest price ever! Ends 9/20/13. http://pubads.g.doubleclick.net/gampad/clk?id=58041151&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
