Hello Sarah and Tom. Thanks for your quick reply. I have checked the valves and solenoids again and they are alright. Bearings were ok when I disassembled the whole turret to change the o-rings on the main piston.
I finally solved the problem, by reducing the amount of oil on the hydro booster's oil tank. Apparently there was too much oil in there. Now it's working and it's also clamping and unclamping a quicker. I also cleaned the tank to ensure there were no particles or debrys. It's been working for several hours now without any symptom so I hope it to stay like that. 2016-11-25 0:15 GMT-03:00 TJoseph Powderly <tjt...@gmail.com>: > i dont have an emc solution > i dont have a solution specific to your machine > but we used a system and a plc that may be an idea > > (we integrated a load of toolchangers from different companies to > Heidenhain and Fanuc controls) > > 1st we used a pressure sensor for the entire system, > we didnt attempt tool change if pressure was low > this idea can be used on the line where > > """the electrovalve keeps blowing until I turn off """ > > valves can be used to isolate the line in question and test for > backpressure > > and for the good/bad clamp issue > we had a solenoid with a line and another pressure sensor > it fed a tiny hole on the clamping surface > IF the tool seated well, it would stop air flow after a short ( 100mS ) > time , pressure would rise > IF the tool was NOTSEATED the code could try again a few times before > aborting and signalling, pressure would NOT rise > IF the tool was NOT UNCLAMPED we could also try to re-release in the PLC > > by using 'backpressure' we could evaluate the seating/releasing of the tool > > HTH > tom tjtr33 > > On 11/25/16 02:28, Leonardo Marsaglia wrote: > > Hello to all. > > > > I have a little problem (I hope it's a little one) with the claping on > the > > turret of the Mazak QT20. > > > > The clamping works with a hydropneumatic system and by looking at it, it > > has some amplificators of force on the back of the charriot. > > > > The problem is, the turret won't unclamp sometimes, and if it does it > takes > > a little while. Then when it clamps again sometimes I can see it's not a > > soft and natural clamping. We checked and replaced the o-rings on the > > turrent side, and I checked the electrovalves on the back. The valves > > seemed to be a little sticky on the return stroke but I cleaned and > > lubricate them and by hand the worked ok. I don't know if that could > cause > > the erratic problem. > > > > Another thing that happens when the turret doesn't want to unclamp, is > that > > the air relief on the electrovalve keeps blowing until I turn off the > > machine or until I press the clamp button again. (When this happens the > > turret doesn't even want to unclamp). > > > > I can't find any docs about the circuit, and I don't have schematics > about > > the hydropneumatic circuit on the manuals I have. So I came to the only > > place I know I will have the best answers :) > > > > Thank as always! > > > > > > > ------------------------------------------------------------ > ------------------ > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- *Leonardo Marsaglia*. ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
