Spindle moving slowly from right to left

[Ben1977]

Hi everybody, i am new in cnc machine, when l turn on spindle motor from control box without loading any G-Code, my spindle bits will move slowly from right to left. Can anyone tell me what actually happening here. I afraid that it will cause different end results if l load my G-Code. Thank you.

[Tweakie.CNC]

Hi Ben,

Could well be electrical noise. Are you using a VFD with your spindle motor ??

Tweakie.

[Ben1977]

Exactly, mine is 220v cnc machine with 800W spindle and 1.5KW VFD, please help me, l am confused now.

[Tweakie.CNC]

Hi Ben,

VFD's are notorious for producing electrical noise.
Check that you have no 'earth loops' and that your VFD is only earthed at one point.
Re-route your spindle cable away from any signal cables.
Check that you have no 'GND loops' in your wiring layout.
Use shielded cable for your limit and estop switches and only connect the screen at the controller end.

Just a few things to try,

Tweakie.

[Ben1977]

Hi Tweakie, sorry for late reply. The problem that l had is due to "rubbish pulse in my cnc working environment", thank you Tweakie for helping me to solve my problems, you are awesome 

[Tweakie.CNC]

Hi Ben,

I am really pleased that you found the problem and it is working OK. 

Tweakie.