On Friday 22 June 2007, [EMAIL PROTECTED] wrote: >Hi Kirk > >On Fri, 22 Jun 2007 00:55:40 -0700, "Enhanced Machine Controller (EMC)" <[email protected]> said: >>I am a little worried about how the encoders will hold up. I found a >>fair amount of oil around the area close to the turret pneumatics. My >>guess is, this may be normal because the pneumatics exhaust inside the >>housing, and the air may be oiled by the lube system? Farther up the >>cross slide, the oil seems to have destroyed the potting covering the >>turret position sensor. I tried to find information on the chips used on >>the board, but I could not find anything. If I can't get it to work, I >>suppose it would not be too difficult to redesign one. > >I built a few similar devices for some HES lathes. I used Hall effect > sensors. There is a magnet on the rotating part there.
Be aware Ray, that hall effect devices, while pretty darned handy, are also poisoned by any petroleum based lubricant known to man. Even something so benign as a squirt of wd-40, and they start falling over in less than a week. I did that once to a nice keyboard that was getting sticky with age. Keys started going dead, so I called microswitch who made the key assemblies, gave them the history & their response was to run, don't walk, to the dishwasher in the company kitchen, put it in the top rack, add at least the usual amount of dishwasher soap and cycle it twice. That did stop the death throes but I still had to replace about $140 worth of those switches at $12 a pop. >>Did you use up >>three digital inputs for this? From what I hear, the tool change system >>relies on timing based on the assumed rpm of the air motor. I wonder if >>it would be worth it to install a course absolute position encoder, and >>base the release, turn and lock sequence on position instead? > >That would seem to me to be overkill since there are only eight places you > need to know. I've probably got pickup blocks out there but they were for > the CHNC rather than the HNC. I seem to remember that there was some > difference between them. > >>I noticed you got rid of the AMP pin terminals. It took me a while to >>figure out what was going on there. I am thinking, I might try to fit >>small euro-style terminals instead. > >I've threaded the standard US Digital cables into these and they have the > plug built into the end. The AMP is nearly impossible to use without the > proprietary tooling. > >>Is the chip on the cross slide circuit board a differential encoder >>driver? >> >>I could not remove the shaft couplers. I think the set screws where >>glued in, so I had to cut the bellows. I still need to figure out how to >>get the collars off. > >Those little connectors were nearly $80 each in the day. I found that the > long end of a good quality allen would torque over about 30 degrees before > the screw let loose. They were not factory glued. > >Rayh > > > >------------------------------------------------------------------------- >This SF.net email is sponsored by DB2 Express >Download DB2 Express C - the FREE version of DB2 express and take >control of your XML. No limits. Just data. Click to get it now. >http://sourceforge.net/powerbar/db2/ >_______________________________________________ >Emc-users mailing list >[email protected] >https://lists.sourceforge.net/lists/listinfo/emc-users -- 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) Extreme feminine beauty is always disturbing. -- Spock, "The Cloud Minders", stardate 5818.4 ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
