I plan to connect the cable shield from the 4 stepper motor cables to the star ground in my panel. Since these cables are located on the same side of my control panel I was thinking to connect all shield together and run 1 cable to the star ground in the opposite side of my panel.

Is this a good idea or I should run individual cables from each shield to the start point ground?

Thanks 

I don't understand your question.  Are these the cables from the drivers to the sockets on the panel (I assume the latter is your 1/8" aluminum)?  If you are really bothered about screening the cables I would make the panel the ground 'cos it's big and will have low impedance, and make the star point on its middle.  If there are 4-way sockets on the panel for the actual motor cables, for example XLR, the screens on the motor cables will connect to the panel.  I doubt it would be worth screening the short cable runs between drivers and sockets, just run 4 wires.

Thank you John

The attached shows the work progress in my controls panel. The 1/8” aluminum plate will only hold what you see in the picture that’s just the push buttons which will control all cnc functions. On the left side of the control panel you can see the 4 drivers where I will connect the cables from the 4 stepper motors. These 4 cables are shielded and I’m talking about the shield from each motor cable which should be grounded. The star point ground is at the top right corner (not visible in the picture) and I was thinking to combine the shields from the 4 motor cables at the left and run one cable to the star point at the right. My question is I don’t know if it’s a good idea to run 1 cable to the star point or 4 (individual cables for each motor cable)

The reason the cable are shielded is to reduce RFI.  What you don't want is to have long lengths of wire connecting the shields to ground - one or 4.  The star point is in the wrong place, it needs to be as close as possible to the drivers.

Just to enlarge on that.  In shielding RFI from the cable, currents are induced in the shield by the capacitance to the conductors.  Those currents have to go somewhere or the shield itself will just act as as an antenna instead of the conductors.  It isn't actually obvious where the best place to do this is, but probably the 0V connection to the actual driver to which that cable is connected.  This stands the best chance of minimising circulating interference currents.  Then connect all the 0V's to a nearby start ground point.  There is debate about what to do at the other end of the cable near the motor, but my inner RF engineer (which earned my crusts for 6 decades) says it should be connected to the motor frame, even if this also has a safety ground.

I have 7 steppers all being driven with unshielded cable and don't have any problems so I wonder just how much it matters.   But my electronics are all in metal chassis.

Thanks John for the education, I will see what I can do.