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Type: Posts; User: sinha

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  1. Replies
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    Yes, provided you are using G41/G42.

    Yes, provided you are using G41/G42.
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    -0.5 on radius means that you are specifying a...

    -0.5 on radius means that you are specifying a smaller radius, whereas the tool has a larger radius. So, it will overcut. But, this will come in picture only if you are using radius compensation....
  3. According to Fanuc manual, the retraction...

    According to Fanuc manual, the retraction distance is not dependent on rpm.
  4. Definitely a good and safe practice.

    Definitely a good and safe practice.
  5. What I still do not know is why, even today, ...

    What I still do not know is why, even today,

    1. Memory is an issue with CNC ?
    2. The in-built calculator of an ordinary computer is more accurate than CNC ?
  6. Typically, an error of 10 to-the-power -10 gets...

    Typically, an error of 10 to-the-power -10 gets introduced in each arithmetic calculation. Therefore, #501 is definitely not equal to -0.675 after 20 additions. However, it would not show up on the...
  7. Rounding/Truncation in axis addresses

    Another thing to mention is, rounding/truncation is automatically done by the control if there are more number of decimal digits than the least-input-increment decimal digits (3 in metric and 4 in...
  8. As explained by Bill, it was caused by floating...

    As explained by Bill, it was caused by floating point error in calculations, not because of rounding to 0.0337
    If the DOC is added 20 times, it may not be exactly 0.675
    Even if it is 0.67495, the...
  9. Replies
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    In my opinion, Fanuc NC Guide is the only...

    In my opinion, Fanuc NC Guide is the only simulation software which can be relied upon 100%.
  10. Replies
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    CNC is not my regular day-to-day activity. I am...

    CNC is not my regular day-to-day activity. I am in a teaching job where CNC is one of the subjects. I studied Macro B in quite detail and also experimented a lot on fanuc machines to verify my...
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    The Operator's Manual does cover G83 and G87, but...

    The Operator's Manual does cover G83 and G87, but it will have to be read in association with the parameter manual for complete information. For example, the manual says that R is always incremental...
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    Depending too much on a CAM software can be...

    Depending too much on a CAM software can be dangerous. All machines are slightly different because of parameter settings. A perfect post-processor is a myth. Sufficient knowledge of manual part...
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    You may like to have a look at this...

    You may like to have a look at this.
    The information I gave was copied from this only. There is a lot more to read.
  14. Replies
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    Quite a few things are parameter dependent. The...

    Quite a few things are parameter dependent. The following information is for Fanuc ...

    Position of R-point
    In G-code system B and C, depending on certain parameter settings, R would either always...
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    Are you using g-code system A, B or C ? Are you...

    Are you using g-code system A, B or C ?
    Are you in absolute or incremental mode ?
    G83 is for front drilling and G87 is for side drilling.
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    NC Plot is not 100% compatible with Fanuc Macro...

    NC Plot is not 100% compatible with Fanuc Macro B.
    For example, the following statement copied from their manual would alarm out on a Fanuc:

    Comparison examples:
    #100 = #101 EQ #102
    If #101...
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    Is it because T1 M6 needs a small delay on this...

    Is it because T1 M6 needs a small delay on this machine ?
  18. Replies
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    Sticky: You got no answer because your requirement is not...

    You got no answer because your requirement is not very clear.
  19. Replies
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    Fair enough. But, what is the harm in using...

    Fair enough.
    But, what is the harm in using P--10-- in the parts you have machined (where machining up to the shoulder was not required)?
    It surely takes the pressure off the insert gradually which...
  20. Replies
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    You have given some good information to us. Thank...

    You have given some good information to us. Thank you!

    Based on your experience, I am of the opinion that, for LARGE threads, one must use P--10-- or a higher value such as 15.
    The last thread...
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    That was with P--10--. The reduced depth of the...

    That was with P--10--. The reduced depth of the last thread can be seen.
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    Yes, it is happening in every pass. This may have...

    Yes, it is happening in every pass. This may have some effect if the helix angle is large. Otherwise, how can the increased load on the insert be explained, as observed by Brent?
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    Brent has observed increased load on insert at Z...

    Brent has observed increased load on insert at Z end when zero chamfer distance is specified.
    This is probably caused by the insert suddenly cutting excess material by its leading edge when the feed...
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    I have now come to the conclusion that this...

    I have now come to the conclusion that this feature is useless and one should always program P--00--, with the understanding that, in most cases, the last one thread will have incorrect pitch. In...
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    I stand corrected. With the default 45 deg...

    I stand corrected. With the default 45 deg retraction, P--10-- would have partial threads.
    If the parameter for pullout angle is modified to have 90 deg pullout, then it would leave one lead...
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