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  1. #277
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    Default Re: CNC router build

    Had a closer look at the pwm signal from Mach3 and the bob. What i found was noise on my 5 V, i did not have time to check the 12 and 24 V....however i am sure it's there too. The noise is caused by the VFD, most likely generating the noise back into the mains then through the power supply. It's unlikely to affect the 5 V digital signals. I should have taken a photo of it



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    Default Re: CNC router build

    Today i confirmed that the noise is coming through the 230/5 volt power supply. Looking at doing the following:

    1) Remove the 12 and 5 volt power supplies.
    2) Remove the Schneider Zelio plc/smart relay.
    3) Make up my own plc/smart relay.....with an on board filtered 5 volt power supply. The microcontroller will do all the machine logic and also do the Mach3 pwm to 0-10V conversion.

    I need to think carefully to try and include all the stuff i might need ...i wont make a fancy board only a through hole board with a few surface mount components, will modify one of my old plc board designs.

    Any ideas or advise will be much appreciated

    CNC router build-test-jpg

    Attached Thumbnails Attached Thumbnails CNC router build-test-jpg  


  3. #279
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    Default Re: CNC router build

    Its been a while since i programmed a micro. Fortunately i managed to run a pwm signal from the micro.....read it accurately on another pin. All that is left is to build and test the converter circuit to convert my micro output to 0-10 V. It might seem to some as overkill but with the micro i can do a few tricks...one is to have the spindle running with zero variation and have the speed exactly as set by Mach3. At least that is the plan



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    Default Re: CNC router build

    I have just completed making up a pwm to 10 V converter. Using the power supplies that caused the initial issues on the 5 axis board, i am getting excellent control over the spindle from mach3. The noise is not affecting anything re analog signal. Also the speed is linear, without any compensating in the micro code....
    I will still make up the noise filtered 5 V dc-dc converter that i use on my microcontroller power supplies. After final testing i will complete the little board, and if anyone has a similar setup with similar issues then i am willing to send them a board for testing/help.

    CNC router build-test2-jpgCNC router build-test3-jpgCNC router build-test4-jpg

    Attached Thumbnails Attached Thumbnails CNC router build-test2-jpg   CNC router build-test3-jpg   CNC router build-test4-jpg  


  5. #281
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    Default Re: CNC router build

    Quote Originally Posted by ericks View Post
    Its been a while since i programmed a micro. Fortunately i managed to run a pwm signal from the micro.....read it accurately on another pin. All that is left is to build and test the converter circuit to convert my micro output to 0-10 V. It might seem to some as overkill but with the micro i can do a few tricks...one is to have the spindle running with zero variation and have the speed exactly as set by Mach3. At least that is the plan
    Good job in finding a fix be interesting to see your board when you have it finished I have one that I have been trying out, but does not have the micro part It has a linear output and a pot to adjust the 0-10v

    Mactec54


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    Default Re: CNC router build

    Quote Originally Posted by mactec54 View Post
    Good job in finding a fix be interesting to see your board when you have it finished I have one that I have been trying out, but does not have the micro part It has a linear output and a pot to adjust the 0-10v
    Thanks Mac.....i will make a simple basic board now due to time constraints, later i want to make one with more functions, basically a little plc.
    I was going to order an off the shelf board but i did not want to get something that would not work properly. This one will be simple, a 24V to 12V/5V converter, these voltages will be available for the machine. Like i said a 8 pin pic micro and an opamp, also a trimpot to adjust the opamp output.

    Anyway it still needs to pass the test once it's built on a board and installed in it's place



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    Default Re: CNC router build

    A couple of weeks ago i purchased a sandblaster. Hooked it up today and media blasted my Z-Axis motor bracket. What i like is all the machine marks are gone

    CNC router build-zmotor-jpg

    Attached Thumbnails Attached Thumbnails CNC router build-zmotor-jpg  


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    Default Re: CNC router build

    Supply installed and connected....

    CNC router build-power2-jpgCNC router build-power1-jpg

    Attached Thumbnails Attached Thumbnails CNC router build-power2-jpg   CNC router build-power1-jpg  


  9. #285
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    Default Re: CNC router build

    Looking great!

    I would quite like a good blasting cabinet.... I have a little hand held hopper fed gun but it eats through media and makes a mess.



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    Default Re: CNC router build

    Quote Originally Posted by zeeflyboy View Post
    Looking great!

    I would quite like a good blasting cabinet.... I have a little hand held hopper fed gun but it eats through media and makes a mess.
    Thanks.....i am keeping an eye to see if it's messing dust outside the cabinet, but looks good so far.



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    Default Re: CNC router build

    Update....received the ball screw support bearings. Excellent products and service from the supplier in Taiwan



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    Default Re: CNC router build

    Almost done with the little power supply board, hopefully it works as required....it,

    1) Will be fed from the 24V/DC power supply
    2) Will supply 12V for the inputs and 5V for the bob
    3) Will do the pwm to 0-10V conversion
    4) Will be housed in a din rail box for ease of mounting

    CNC router build-pcb4-jpg

    Attached Thumbnails Attached Thumbnails CNC router build-pcb4-jpg  


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