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  1. #11
    Jazz,
    Spindle I am getting is 1.5kw air cooled locally and the vfd is sinamics v20 inverter from siemens. will they be ok

  2. #12
    Quote Originally Posted by vksingh View Post
    Jazz,
    Spindle I am getting is 1.5kw air cooled locally and the vfd is sinamics v20 inverter from siemens. will they be ok
    Cheap Air cooled spindles often have low duty cycles. This means they can't be run for extended periods so you will need to check the duty cycle of the spindle. I've seen some spindles have duty cycles less than 1hr which means they need to be shut down and allowed to cool which for CNC is not good enough.

    Water cooled spindles don't really have a Duty cycle and can be run for days without stopping.!!

    Don't know the VFD but Siemens is good quality so provided it's rated correctly then you shouldn't have a problem.
    Last edited by JAZZCNC; 14-06-2014 at 07:31 PM.

  3. #13
    Hi every one it has been a week now. I have assembled the frame.
    Click image for larger version. 

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    I am running Mach3 Version R3.043.066

    Every thing is running fine, but there is a problem. when a program is running or the machine is idle, motors rotates randomly. The motion is for fraction of a second. This can happen any time even when the machine is not running any g-code. I am unable to identify the problem. Please kindly help.
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  4. #14
    This will be electrical noise. Use shielded cable on all motors and signal cables and ground the shielding at one end only and take all grounds to a single point. Don't run single cables along side high power cables like Spindle power cable.

    Don't fasten signal and power cables together using cable ties.

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