Greetings all; I had taken a shim block from the sheldon that spaced the z nut back towards the bed by about 20 thou too much, to TLM to shave that 20 thou off it, and found TLM wouldn't home. The z home switch had been lifted off its mount where it had been gooped to for a couple years. It senses the tapered gib gib holder on the rear of the carriage. Nice flat bottom and placed so that the carriage cannot overrun the travel going toward the spindle, runs into the chuck and stops solid. So it can't overtravel, allowing the switch to pop up and then be trapped and torn up when a move to the right is attempted.
The switch was not damaged, so I glued it back on, and verified that it worked by running the carriage onto it and back off several times. I've also tried to convert its native linear unit to mm's from inch, but that was several months back and I don't recall setting the scale's to compensate, so the inch to metric conversion can be assumed to be a "work in progress". But in all this, I now have a huge lag in the z motion. With halmeters on the z signal chain, I am seeing the z-motor-cmd respond to key board move commands quickly, as expected. And the motor moves at the expected speed when the arrow key is pressed. But after the key release, the motor continues on in the same direction at around 1.5 microsteps/second until the motor-pos-fb has reached the motor-pos-cmd value. Way too slow to show a velocity in the dro. This may take around a minute! And its messing with the home operation since the fb during direction changes doesn't have time to settle. Shared switches complicates things. I should fix that but it will take another BoB and cable to give me those pins from p2 on the 5i25. The BoB I have, and a cable is makeable from parts on hand, so the lack of a round tuit is the instant stopper, that, and making a place for the BoB in or on the motor control box. Does this "delay to final position" behavior ring any bells to anyone? -- Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
