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Thread: Finished VFD mod to my lathe

  1. #1
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    Default Finished VFD mod to my lathe








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  2. #2
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    Cool.
    What functions did you assign to the stock buttons?
    Len

  3. #3
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    I hope you are going to cover the resistor and terminations?
    Expanded metal works good for that.
    Cheers,
    Jon

  4. #4
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    Quote Originally Posted by QSIMDO View Post
    Cool.
    What functions did you assign to the stock buttons?
    The jog button is set to forward 5hz, the E-stop to E-stop with 0.5 second Decel. Accel to 3 seconds, Decel to 2 seconds.
    Turned off Decel stall protection so it uses the external resistor.
    Where the flood coolant switch would go is the Pot for speed, 0hz to 120hz.
    The Apron mounted control lever is wired for Forward/Stop, Reverse/Stop operation.
    Used a Cat5 Ethernet cable for signals to VFD, used all 8 wires.
    Future additions, maybe a toggle switch to switch between maybe 3 second Decel and 1 second Decel for threading. Possibly another switch to turn flood coolant on and off.

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  5. #5
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    Quote Originally Posted by Jon Heron View Post
    I hope you are going to cover the resistor and terminations?
    Expanded metal works good for that.
    Cheers,
    Jon
    I should, doesn't even get warm doing a few E-stops. Think possible high voltage/current would be the bigger concern.

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  6. #6
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    Touching those will light you up big time. A perforated metal shield with a swarf cap is in order.

    Swarf shorting the resistor will take out your VFD braking system.

    Check your deceleration time setting with a heavy chuck, decent sized work-piece, and from high speed. It might not be able to handle that, braking resistor or not.
    Last edited by lakeside53; 06-12-2019 at 07:04 PM.

  7. #7
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    Quote Originally Posted by lakeside53 View Post
    Touching those will light you up big time. A perforated metal shield with a swarf cap is in order.

    Swarf shorting the resistor will take out your VFD braking system.

    Check your deceleration time setting with a heavy chuck, decent sized work-piece, and from high speed. It might not be able to handle that, braking resistor or not.
    Well, definitely have to address all of that. Of course I have to go back to work again...

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  8. #8
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    This is just an observation that might not apply. Feel free to ignore.

    I noticed that the resistor is mounted by way of caps on both ends. I thought that one of the cooling mechanisms for a wire wound resistor is the air moving (via convection) through the middle of the tube. It seems that the end caps will interfere with that.

    Dan
    At the end of the project, there is a profound difference between spare parts and extra parts.

  9. #9
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    Holy cats! That will take care of any cats. Of course you won't need them because it will probably eventually get the mice too. I guess that assumes they are using the lathe.

    Is it possible for swarf to bounce down there, and into the motor fan?

    Btw, nice work.


    Quote Originally Posted by RB211 View Post
    Last edited by Glug; 06-12-2019 at 08:23 PM.

  10. #10
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    Swarf will get everywhere but the rear splash guard protects the motor pretty well. The cooling fan on the top of the cabinet is guarded and filtered.
    I'm wondering how high the voltage gets on that resistor, maybe 300v. It's only active for three seconds or less at a time.
    The kind of work I do is never on anything massive, but you know how that goes. This week I had a job that exceeded my Bridgeport's Z height... Maybe in two weeks I'll be turning something that weighs 300 lbs at 2000 rpm and have to hit the E-stop... Probably melt the wires.(which are high quality USA made)

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