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IndustryArena Forum > MetalWorking Machines > CNC Swiss Screw Machines > CITIZEN Machines > Citizen L32 programming question on using G75
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  1. #1
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    Citizen L32 programming question on using G75

    I have a Citizen L32 with a mitsubishi Meldas series 500 control. I wanted to use the G75 cycle for chip breaking in the Z axis . I keep getting a program error and I am not sure on what format to enter in my P Q R numbers is it in decimal form or 4 digits. If any one has a program example that woulkd be appreciated . What I would like to do is start at a .400 dia. and cut a straight line in th z axis .700 taking maybe .030 at a pass or whaytever I need to do to control the chips.

  2. #2
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    Re: Citizen L32 programming question on using G75

    hello pls find attached infos about g75

    is this what you are looking for ? to cut the part, or a groove ? or you wish for the LFV ?

    if it is about:
    ... cutting/grooving, i never use g75, but simple g-code, for more control; if you wish, i will share an example
    ... LFV, then i may select infos from the manuals, and share it to you; i just searched, there is something, but it seems to be much more, in comparison to g75

    What I would like to do is start at a .400 dia. and cut a straight line in th z axis .700 taking maybe .030 at a pass or whaytever I need to do to control the chips.
    i saw this later, it seems you are looking for LFV ... infos are spread all over the manuals, i will search later today

    until then, just try this :
    ... increase your feed
    ... decrease your rpms

    chips are broken by increasing the feed; also, if you work at an rpm that breaks your chips, increasing the rpm may no longer break them, but make them tangle arround ... thus a greater rpm may break your chips at a higher feed rate

    i would start with a minimal M/min, and increase the feed

    however, some soft materials simply don't break easy into smaller chips; i will be back with infos on LFV / kindly
    Ladyhawke - My Delirium, https://www.youtube.com/watch?v=X_bFO1SNRZg

  3. #3
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    Re: Citizen L32 programming question on using G75

    ...using a "-" sign can cause a problem sometimes with P's and Q's or K's in canned cycles...depends on CNC.

  4. #4
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    Re: Citizen L32 programming question on using G75

    Quote Originally Posted by deadlykitten View Post
    hello pls find attached infos about g75

    is this what you are looking for ? to cut the part, or a groove ? or you wish for the LFV ?

    if it is about:
    ... cutting/grooving, i never use g75, but simple g-code, for more control; if you wish, i will share an example
    ... LFV, then i may select infos from the manuals, and share it to you; i just searched, there is something, but it seems to be much more, in comparison to g75



    i saw this later, it seems you are looking for LFV ... infos are spread all over the manuals, i will search later today

    until then, just try this :
    ... increase your feed
    ... decrease your rpms

    chips are broken by increasing the feed; also, if you work at an rpm that breaks your chips, increasing the rpm may no longer break them, but make them tangle arround ... thus a greater rpm may break your chips at a higher feed rate

    i would start with a minimal M/min, and increase the feed

    however, some soft materials simply don't break easy into smaller chips; i will be back with infos on LFV / kindly
    My machine does not have the LFV but with the G75 i am looking to do kind of the same thing. I do it all the time on our Fanuc controlled Lathes. I am just looking to straight turning, I have tried everything with feeds and speeds but the material just does not break up consistently to run unattended.

  5. #5
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    Re: Citizen L32 programming question on using G75

    hire a pro..

  6. #6
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    Re: Citizen L32 programming question on using G75

    If you can use macro's try this it works well on a mitsubishi m70




    G0X.400Z-.05
    G1Z0.F.0025


    #100=0(start point)
    #101=.030(peck dist.)
    #102=.700(depth)
    #103=.003(chip break)

    WHILE[#100LT#102]DO1

    IF[#100LT#102]GOTO100
    #100=#103(IF #100 GE #103 MAKE #100 THE SAME AS #103)(THIS AVOIDS OVER RUNNING THE FINAL DIM.)
    N100



    G1Z[#100+#101]F.0025
    G1W-#103(BREAK CHIP could be a dwell also to break the chip)


    #100=#100+#101
    END1

    G1X.500
    G0Z-.1

  7. #7
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    Re: Citizen L32 programming question on using G75

    hy jim, please, what are you doing on the fanuc, that you wish to do also on the mitshubishi/citizen ?

    is it similar to the code shared by rcs ?

    the material just does not break up consistently to run unattended
    if possible, use an endmill to cut a longitudinal groove : this should break the chips when turning; obviously, this will require to lower your turning specs, and use an insert that can handle that bump, but may deliver a ' clean ' part

    another trick may be to rough towards reverse_Z, thus the oposite way ( may require an insert with bigger nose radius, so not to break during plunging ); this won't break your chips, but may throw them into the chipconveyor;

    * in both cases, may be required to adjust your operation in respect to guide bushing length / kindly
    Ladyhawke - My Delirium, https://www.youtube.com/watch?v=X_bFO1SNRZg

  8. #8
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    Re: Citizen L32 programming question on using G75

    Quote Originally Posted by rcs60 View Post
    If you can use macro's try this it works well on a mitsubishi m70




    G0X.400Z-.05
    G1Z0.F.0025


    #100=0(start point)
    #101=.030(peck dist.)
    #102=.700(depth)
    #103=.003(chip break)

    WHILE[#100LT#102]DO1

    IF[#100LT#102]GOTO100
    #100=#103(IF #100 GE #103 MAKE #100 THE SAME AS #103)(THIS AVOIDS OVER RUNNING THE FINAL DIM.)
    N100



    G1Z[#100+#101]F.0025
    G1W-#103(BREAK CHIP could be a dwell also to break the chip)


    #100=#100+#101
    END1

    G1X.500
    G0Z-.1
    Thanks it worked out well

  9. #9
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    Re: Citizen L32 programming question on using G75

    your welcome

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