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Thread: King Rich KRV-2000 Knee Mill CNC Conversion

  1. #25
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    Default Servo motor cables

    The Serve motor cables run in flexible conduits from the drive enclosure. Cable glands need to be mounted at both ends of the conduit. Assembling the encoder cable drive connectors has required hours of careful soldering and heat shrinking using a magnifying head set to see the tiny contacts. The motor end will be assembled once the cable is threaded through the conduit.

    Attached Thumbnails Attached Thumbnails King Rich KRV-2000 Knee Mill CNC Conversion-encoder-cable-013small-jpg   King Rich KRV-2000 Knee Mill CNC Conversion-encoder-cable-026small-jpg   King Rich KRV-2000 Knee Mill CNC Conversion-encoder-cable-027small-jpg   King Rich KRV-2000 Knee Mill CNC Conversion-drive-enclosure-001small-jpg  

    King Rich KRV-2000 Knee Mill CNC Conversion-drive-enclosure-005small-jpg   King Rich KRV-2000 Knee Mill CNC Conversion-encoder-cable-016small-jpg   King Rich KRV-2000 Knee Mill CNC Conversion-encoder-cable-021small-jpg  


  2. #26
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    Default

    The drives mounted on the enclosure base plate.

    Attached Thumbnails Attached Thumbnails King Rich KRV-2000 Knee Mill CNC Conversion-img_1126small-jpg   King Rich KRV-2000 Knee Mill CNC Conversion-img_1120small-jpg  


  3. #27
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    Default

    Just Stumbled across your thread. VERY nice machine you have there. Can't wait to see a video of it running. It's nice to know I have inspired others to convert their knee mills.

    Keep up the good work,

    Chich



  4. #28
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    Default

    looking good. why did you go with ac servo over DC servo and steppers?



  5. #29
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    Default Why AC Servos?

    Deano,

    I asked the same question early on in this thread. See Ray Gardiner's response on the first page. The Motors are smaller for their relative output and brushless. The Drives are more complex and expensive. My Used motors and drives have probably been removed from a critical production machine during a scheduled maintenance period in order to minimise the chance of failure. The only wearing part in the motors is the bearings. The drives have large capacitors that can eventually leak/breakdown. My kit was tested by the seller in Korea. I am yet to power them up and confirm proper operation. AC servos seem to be the choice for most professional industrial control applications but come at a premium cost. It is only that the used kit I purchased from Korea is now much more affordable that I could consider the advantages over DC Servos. Steppers are not recommended for machines of this size.



  6. #30
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    Default

    cool mate

    i will be intrested to see how you go setting up the ac servos. i assume you got them off ebay, noticed a sell in korea that is selling kits similiar to what you posted.

    any more progress?



  7. #31
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    Default Build temporarily on hold

    I have eventually found a good crankshaft for my Honda S600 restoration project and my focus has shifted back to get some progress happening with that. If you know these little cars you maybe interested to follow my build thread here: http://honda-tech.com/showthread.php?t=2460545
    I would like mine to look as good as this one.

    Attached Thumbnails Attached Thumbnails King Rich KRV-2000 Knee Mill CNC Conversion-ricks-engine-jpg   King Rich KRV-2000 Knee Mill CNC Conversion-riicks-chassis-jpg  


  8. #32
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    Hi all I have some good news, I managed to get the cover off the quill on a KRV-3000SL machine and get a photo of the setup. I also have let my head go and purchased a KRV-3000 that I intend to convert to CNC using servos. It has all the ball screws etc the same as the machine here its just a bigger one. I have converted a X3 in the past to CNC I need the bigger table. Looked sriously at the X7 but the table was far to small thats why I went with the King Rich I also had them check the tolerance of the mill and they claim .01 of a mm. In my case I will be happy if its .05 just to get the bigger table.
    When the cover was off I took some rough measurements of the mounting plate. Over the next month I will draft up the design and post it on the forum.
    Hope this helps the project. Have a great day.
    Tony

    Attached Thumbnails Attached Thumbnails King Rich KRV-2000 Knee Mill CNC Conversion-pict0134-jpg  


  9. #33
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    It was pointed out to me that its difficult to see the detail of how the servo motor drives the ball screw. So what I have done is crop the high res image this one came from to show more detail of the ball screw.
    At the very top of the ball screw is a black belt and pulley this is above the ball screw bearing carrier. Hope the new image helps. The manual adjust leaver just drives a encoder that feeds back to the control computer. There is no phsyical connection between the lever and the ball screw.
    Have a great day.
    Tony

    Attached Thumbnails Attached Thumbnails King Rich KRV-2000 Knee Mill CNC Conversion-ball-screw-detail-jpg  


  10. #34
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    Default Modification for Manual Operation

    Tony,

    Here are the circuit modifications I needed to make, to run the Mill as supplied in manual mode.

    Attached Thumbnails Attached Thumbnails King Rich KRV-2000 Knee Mill CNC Conversion-estop-reset-button-jpg   King Rich KRV-2000 Knee Mill CNC Conversion-estop-reset-circuit-jpg   King Rich KRV-2000 Knee Mill CNC Conversion-euro-relay-plug-jpg   King Rich KRV-2000 Knee Mill CNC Conversion-millcircuits-008-medium-jpg  

    King Rich KRV-2000 Knee Mill CNC Conversion-powerbox-terminal-connections-jpg   King Rich KRV-2000 Knee Mill CNC Conversion-pendant-circuit-jpg   King Rich KRV-2000 Knee Mill CNC Conversion-coolant-spindle-plugs-jpg   King Rich KRV-2000 Knee Mill CNC Conversion-coolant-spindle-sockets-jpg  

    King Rich KRV-2000 Knee Mill CNC Conversion-coolant-pump-switch-jpg  


  11. #35
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    Default

    It might take me a while to get my head around it, thanks for that its a great help.
    Tony



  12. #36
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    John here is a photo of the inside of the electrical box on my 3000 is it the same as yours?
    Tony

    Attached Thumbnails Attached Thumbnails King Rich KRV-2000 Knee Mill CNC Conversion-electric-box-jpg  


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