1st thing I'll check is if there is any mechanical loose play such as the pinion gear, chuck, spindle mount or other wobbly things...
2nd I'll check if all my cables are plugged in properly.
3rd I'll lower the acceleration of the Z motor. in motor tuning.
4th I'll check the plunging speed of the CAM.

Tried all of the above with no luck just don't know what the Hell is wrong???

Are you using Z touch-off? if you do, reduce the probing speed.

Me Too
 

my motors also hummed but I tweeked the on the gecko g203v. I do not see that you are using geckos but see if your stepper drivers have a tweeking device. I am guessing this is a potentiometer. Let us know. Thanks

Thanks for all your input have not found the Problem yet but I will keep on hunting for it until I do. I will let You guys know what it was when I find it.
Thanks ones again.
Keep the sugestions coming.

Can you connect a dial indicator to your Z-axis and then make repeated small moves? If the indicator is positioned so that the plunger is always partially depressed, you'll be able to see if the Z-axis returns to the same up and to the same down position. Pausing at each end of travel long enough for the needle to settle will let you see if the moves are repeatable.

If the moves are not repeatable, try slowing down the acceleration to see if ramping might be causing a missed step.

If slowing the acceleration does not correct unrepeatable behavior, then you might have a backlash condition. Most geared motors have a nominal amount of backlash to keep them from binding when they reverse direction. Even a very nominal amount of backlash can become noticeable if repeated moves are made.

Of course I'm assuming that the pinion gear is properly meshed and that it is properly tensioned, with with a spring or other mechanical setting. If the pinion gear is tensioned without a spring, have you verified that pinion gear is seated to the same depth over its entire length of travel? If something is warped or bowed, tension would change as the motor moves along its axis.

Stunning Table !!! just to bad about that blue Bulls sign !!!!! :D

What about the blue bulle sign

More of a SHARK supporter !!!! :)

Paulus,It might be that you are losing steps as the motor is good to take the z-slide up and down but given that you cut into something and your cutter getting blunt with resistance as it cuts away it is basically forcing the cutter into the material.If you get the resistance newtons laws come into play and the motor can`t hold the position and you basically lose steps( My 5 cents).If you use cheap cutters it will happen at 4000 lines!