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  1. #1
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    Feb 2006
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    1770

    G71 type I and type II cycles

    Earlier, there was only type I cycle (I think so). Type II cycle was introduced to take care of undercuts or pockets along the length of the job. The control identifies these two cycles on the basis of whether only X is programmed in the P block, or both X and Z are programmed. Earlier, Z was not allowed in the P block (in type I cycle). My question is that, if we program both X and Z in the P block, for a job which has monotonic increase in both X and Z (i.e., has no undercuts, hence suitable for type I cycle), what will happen?

  2. #2
    Gold Member
    Join Date
    Jul 2005
    Posts
    12177
    I don't know about any other machine but on a Haas nothing unusual happens if you have X and Z in the P block; the cycle runs fine whether it is monotonic or non-monotonic.
    An open mind is a virtue...so long as all the common sense has not leaked out.

  3. #3
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    Feb 2006
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    949
    nothing should working fine.
    The best way to learn is trial error.

  4. #4
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    Feb 2006
    Posts
    1770

    radius compensation in Type II G71 turning

    Fanuc 0i manual says in G71 type II section:
    "The offset of the tool tip radius is not added to finishing allowances. In turning, the offset of the tool tip radius is assumed to be zero."
    Does it mean that radius compensation (G41/42) is not possible in type II turning?

  5. #5
    Gold Member
    Join Date
    Jul 2005
    Posts
    12177
    On some machines tip compensation is not active during the G71 but is applied in the G70 cycle. It is necessary to make the finish allowance large enough to include the compensation amount. As far as I know this applies to both type I and II.
    An open mind is a virtue...so long as all the common sense has not leaked out.

  6. #6
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    Join Date
    Sep 2008
    Posts
    48
    examples
    G71 TYPE 2

    O1234
    G97M3S1500
    T0202
    G0 X71 Z1

    G71 U3 R1
    G71 P1 Q2 U1 W0,5 F0,25

    N1 G0 X50 W0,1

    G1 Z0.
    X60 Z-5
    Z-20
    X57 Z-23 **********
    Z-30 *********

    N2 G1 X70
    G0 X150 Z200

    M30


    (ATTENTION TOOL ANGLE)

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