On Thursday 24 May 2018 23:04:06 John Dammeyer wrote: > Quick mini survey. If you have a knee mill, where have you mounted > your home switches? > I understand it doesn't matter because the machine coordinate system > is only used to establish a fixed reference. For the rest of the time > we use various world coordinate systems with the G54... > > So the switches: > For the Y axis so the bed moves towards you or away?
I have mine set to trip about 50 thou from the front hard stop. Actual home after it hits at high speed, then it backs away slow till the opens. > For the X axis so the bed moves to the left or to the right? I have that set to trip the switch when the table is about 50 thou from a hard stop. So the table is all the way left. If I've put a squirt of iso-68 Vactra on the ways, the long out and back moves while homing helps to distribute the oil. > The Z axis obvious because we always want it to move away from the > tool tip to avoid a crash. > And that is about 50 thou from the top of the post. I use home offsets to essentially center up the xy when the tables stop moving. No switch on the A, I simply run it to the zero index mark and touch it off. My biggest problem is the pointed tool 0 image, its out of time with the table by about 175 degrees. > For example, if you periodically put your 4th Axis on the left hand > side of the bed it's probably better to have the system home so the > table moves to the left. In effect this makes the tool move to the > right Just in case you ask it to home but forgot that you had the 4th > axis bolted down. > > And that brings up the third question about a 4th axis. If you have > one, do you tend to put it on the left just like a lathe spindle or on > the right? Any reason for the preference? Often there are tool > changers on the left so it makes more sense to have the 4th on the > right. Thats entirely up to you, John. With my drive motor sticking out at a 45 degree angle it has to be on the left end of the table so the motor clears the head if its moved that far to the right. Its a long motor mount. When its on the little mill, I drilled and tapped the table for the mount. > Thanks > John -- 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> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
