Dear Sirs,

I got a problem of OKK horizontal machine center.

My OKK Horizontal machine center is HM80, year of Manufacture: 2003, and CNC control is Fanuc 0imd
And the Table index is Full 4 axis, By worm gear.

Now when the Table is clamping, the Load is abnormal. But if we put the M11 to MDI, and unclamp, the Load is back to normal immediately. (PS: there no any work piece on the Table.)

Here with the photo of monitor of B axis in attached for your reference, please check,
This is table in Unclamp. The current value around -12(%) and -3(A), I think is normal, but when we clamping the table, the current value will go to 160~180% and 80(A) or higher. Could anyone give me a few pointers with this problem?