Hi , this is my first post on this site so i apologise if it is a bit long winded.
C.N.C machining is relatively new to me , i have only got 4 ish years or experience and only 3 on this machine. All three without problem . Until now...
Could any of you guys please help me with a hitachi seiki lathe type TF20 with Fanuc series 21-T controls ? The problem started when a part came free from the chuck whilst being machined. This has happened numerous times , all without serious consequence . This time however , after hitting the emergency stop button , i noticed a torque alarm , i didnt note the number as it cleared too quickly! I then moved the turret clear of the jaws and tried to zero return the machine as usual , but at the end of the Z return cycle , it stops and shows
506 over travel +X
It does the X axis first as normal without problem , but near the end of the Z cycle the alarm triggers , showing an overtravel on X. Strange?
506 is the hardware overtravel , but the limit switch is not hit by the dog.
Also there is an external alarm , 1005 , for which there is no reference in the alarm list in fanucs manual , and i do not have the maintenance volume of the seiki literature.
I have tried to remedy this by the P and cancel buttons on power up , but this does not work , nor does adjusting the x or z axis with the 1850 grid shift parameter , the machine just halts at the end of z zero.
Should i be able to set the reference point by software or is it necessary to adjust the ball screw ( a procedure i know next to nothing about!)
Thanks in advice people , any help would be , well , really helpfull !!
Great site by the way.
Cheers