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IndustryArena Forum > MetalWorking > MetalWork Discussion > G74 What am I doing wrong??
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  1. #1
    Join Date
    Jan 2008
    Posts
    76

    G74 What am I doing wrong??

    I am running a lynx 200L lathe with a fanuc 21i-t control. I keep getting an invalid decimal point error. I don't know what I am missing, the manual isn't to clear and I don't get what the error code is saying.

    (END MILL .5 DIA.)
    (TOOL - 5 OFFSET - 5)
    G0 T0505
    G97 S2000 M03
    M8
    G0 G54 X0. Z.25
    Z.1
    G74 R0.1
    G74 Z-.4586 Q.1 F.002
    G0 Z.25
    M9
    G28 U0. W0. M05
    T0500
    M01

    I am still new at programing a lathe so any help would be appreciated.

    Hennessy

  2. #2
    Join Date
    Mar 2003
    Posts
    2932
    Q doesn't accept a decimal point. Try this:

    G74 Z-.4586 Q1000 F.002

    Also, I don't know if you're aware of the Daewoo/Doosan forum on this site...

  3. #3
    Join Date
    Jan 2008
    Posts
    76
    Quote Originally Posted by dcoupar View Post
    Q doesn't accept a decimal point. Try this:

    G74 Z-.4586 Q1000 F.002

    Also, I don't know if you're aware of the Daewoo/Doosan forum on this site...
    Ah I see... now I get why Parameter 5139 is 1000. So how do I call out a peck depth?

    Quote Originally Posted by dcoupar View Post
    Also, I don't know if you're aware of the Daewoo/Doosan forum on this site...
    Ya I posted here because I needed a quick reply. I got thrown in to the fire today. We needed some tooling made for in house use and of course it needs to be done ASAP. So I had 2 choices surface them on the mill which would take 2.5 hours a part, or run them on the lathe at 10 min a part. I also figured this was more just my lack of knowledge on using a code (not machine specific). Thanks for the quick reply it would have taken me forever to figure that one out.

    Hennessy

  4. #4
    Join Date
    Mar 2003
    Posts
    2932
    Quote Originally Posted by Hennessy View Post
    Ah I see... now I get why Parameter 5139 is 1000. So how do I call out a peck depth?
    Just put a Q value in the G74 block. Parameter 5139 will update. If you don't include a Q in your G74, it will peck by the current value of 5139. I always include the Q as I want to be sure what my peck amount will be.

  5. #5
    Join Date
    Jan 2010
    Posts
    3

    g74

    You need to change Q.1 to Q1000

    Your canned cycle works using trailing zero's and not decimal programming

    hope this helps,

    sam

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