John, Welcome to EMC2! I can't answer all of your questions, but I will share my homing experience: a CNC mill homes every axis from the standpoint of the tool and all movement during homing is positive. This means the table moves to the left and toward you, and the spindle moves up. Now your tool is at the right, rear, and top of your work envelope. This is Machine Zero. Every move from this location is negative. Enjoy! Jim
----- Original Message ----- From: John A. Stewart <[email protected]> To: Enhanced Machine Controller (EMC) <[email protected]> Sent: Sat Sep 17 14:43:20 2011 Subject: [Emc-users] Beginner questions regarding axis. May I ask a beginner question or two? I have a KX1, but with a G540. It is all "kind of" working, but maybe I have a conceptual misunderstanding or two. Can someone help please? It has been all connected together now for a day or so. 0) Metric machine, so all of the following is metric. 1) X and Y axis. limit/home switches working, but x and y axis is set to: Home Location -3.0 Table Travel 0.0 to 250.0 (110mm for Y) Home Switch Location 0.0 Home Search Velocity 1.0 Home Latch direction SAME Homed, table is to right, and close to vertical column. Q: Would it be better to have Home Location 0.0 and table travel -5 to 245? 2) Z axis - is "zero" top of travel? Home Location -10.0 Table travel -200.0 to 0.0 Home Switch Location 0.0 Home search velocity 1.0 Q: Is it right to have these negative values here? 3) I'm thinking that travel when homing in EMC2 is not correct, distance wise. I'm thinking that it is not moving as much as the readout on the screens say; I have 4mm pitch leadscrews, 1.8 degree steppers, directly coupled: Motor steps 200.0 Driver Microstepping 2.0 Pulley teeth 1.0 to 1.0 Leadscrew 4.0 mm/rev Maximum Vel 8.3 mm/s (machine says "Rapid moving, 1000mm/min; feeding speed max 500mm/min) Maximum accel 50.0 mm/s2 Looking forward to learning to use this machine in earnest, and thanks in advance for anyone who can pull the cotton wool out of my brain for me. ;-) JohnS Ottawa, Canada. ------------------------------------------------------------------------------ BlackBerry® DevCon Americas, Oct. 18-20, San Francisco, CA http://p.sf.net/sfu/rim-devcon-copy2 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users This communication is for the use of the intended recipient only. It may contain information that is privileged and confidential. If you are not the intended recipient of this communication, the disclosure, copying, distribution or use hereof is prohibited. If you have received this communication in error, please advise me by return e-mail or by telephone and then delete it immediately.
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