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  1. #1
    Join Date
    Nov 2005
    Posts
    34

    KFlop Single Point Threading

    I am considering a 2nd KFlop for use on my newly converted CNC lathe. What is the current status of single point threading on the KFlop? My lathe currently has steppers, 3hp motor, VFD and 100 ppr quadrature encoder, but no index pulse.

  2. #2
    Join Date
    Aug 2005
    Posts
    129

    Re: KFlop Single Point Threading

    Works great on my lathe, and you can engage the threading with spindle off, rotate spindle by hand and the z axis will slave along so that you can line up with an already cut thread that needs to be cleaned up or re-cut. Its great.

    M4 threading works now too.

    No need for index pulse one my machine, just quadrature encoder.

    Andrew
    Andrew Abken
    www.drewtronics.net - PCB Cutters

  3. #3
    Join Date
    May 2006
    Posts
    4043

    Re: KFlop Single Point Threading

    Hi netboss,

    Here are some User videos:

    https://youtu.be/29Q0kOsRWlY

    https://youtu.be/OIOkBdL5hGw

    An index pulse is not needed. That just means that the Spindle 0 degree point (where the Spindle synchronized motions will begin) will be arbitrary depending on how the Spindle is oriented on power up or when the Spindle Position is reset. Normally the start position of a Thread doesn't matter as long as it is consistent from pass to pass.

    HTH
    Regards
    TK
    http://dynomotion.com

  4. #4
    Join Date
    May 2012
    Posts
    537

    Re: KFlop Single Point Threading

    Tom is there a way to reduce the amount of lead off at the end of threading? Or lead in in the first video. Kinda looks like if you were threading up to a square shoulder you would end up with a fair bit of a gap not threaded.

  5. #5
    Join Date
    May 2006
    Posts
    4043

    Re: KFlop Single Point Threading

    Hi mmurray70,

    I'm not exactly sure what you mean - but the motion path and feedrate can be programmed in the GCode. It looks like that code does a 45 degree angle to ramp out as in our example. The Ramp out at 1.4142X Feedrate keeps the pitch in the Z dimension the same while moving both Axes. Probably not so useful but moreso to show what is possible.

    The path:

    Attachment 363608

    The Code:
    Code:
    G20
    G43H2001
    G0 X0.8 Z3
    M3S100
    M100
    G00 Z3
    (Pass1)
    G00 X0.49
    G32 Z2.3 F0.1
    G32 X0.69 Z2.1 F.14142
    G00 X0.8
    G00 Z3
    (Pass2)
    G00 X0.48
    G32 Z2.3 F0.1
    G32 X0.69 Z2.09 F.14142
    G00 X0.8
    G00 Z3
    (Pass3)
    S75
    G00 X0.47
    G32 Z2.3 F0.1
    G32 X0.69 Z2.08 F.14142
    G00 X0.8
    G00 Z3
    (Pass4)
    S200
    G00 X0.46
    G32 Z2.3 F0.1
    G32 X0.69 Z2.07 F.14142
    G00 X0.8
    G00 Z3
    (Pass5)
    G00 X0.45
    G32 Z2.3 F0.1
    G32 X0.69 Z2.06 F.14142
    G00 X0.8
    G00 Z3
    M30

    Regards
    TK
    http://dynomotion.com

  6. #6
    Join Date
    May 2012
    Posts
    537

    Re: KFlop Single Point Threading

    Ok yes i see how it works now. So the ramp can easily be made smaller or even a different angle. Good to know. Thanks.

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