NPT G CODE by aoa29226

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									                                                                                                                   NPT G CODE


                      PROGRAM FOR NPT & NPTF THREADS Only                                                           NOTE!!! ONLY CHANGE THESE VARIABLES TO GET PROGRAM
Thread description and tool #:                                                                                          Major             Cutter         Pitch      Full Thd        SFM     Feed per       # of
Start point at center of hole in X & Y and top of part in Z                                                            Diameter          Diameter        (TPI)     Depth(MAX)                tooth        flutes
                 M3        S 1284                                                                                        1.889             0.595         11.5         0.681          200     0.0015          4
    G01          G91                                   Z- 0.69187                                      F   30.0
                 G41       X 0.3235 Y 0.3235            D (offset#)
                 G03      X- 0.3235 Y 0.3235            Z 0.01087          i-   0.3235    j      0     F    5.28                                 Threadmill Pitches
                 G03      X- 0.6477 Y- 0.6470           Z 0.02174           i      0     j-   0.6477   F    5.28                           Sizes       TPI          Lead
                 G03       X 0.6477 Y- 0.6484           Z 0.02174           i   0.6484    j      0     F    5.28                      1/16 & 1/8 NPT    27        0.03704
                 G03       X 0.6490 Y 0.6484            Z 0.02174           i      0      j   0.6490   F    5.28                      1/4 & 3/8 NPT     18        0.05556
                 G03      X- 0.6490 Y 0.6497            Z 0.02174          i-   0.6497    j      0     F    5.28                      1/2 & 3/4 NPT     14        0.07143
                 G03      X- 0.3249 Y- 0.3249           Z 0.01087           i      0     j-   0.3249   F   10.56                        1" - 2" NPT    11.5       0.08696
    G00          G40       X 0.3249 Y- 0.3249                                                          F    30.0
    G00                                                 Z 0.58317
                 G90


Note: (offset #) is for the cutter comp. If you are using tool 18, put in D18




NOTE: THIS SHEET IS NOT WRITE PROTECTED.                                                                              R1 9/17/03
       PLEASE SAVE A COPY BEFORE CHANGING
                                                                                                                      NOTES:
Diameters for threads with a depth equal to L1+L3                                                                     -The Major Diameter is the part diameter listed to the left
               Cutter        Major         Depth                                                                      -The cutter diameter is the tool diameter listed to the left
   Thrd.        Dia           Dia         (L1+L3)                                                                     -The pitch is the number of threads per inch (see chart above)
   1/16        0.237         0.309         0.271                                                                     - The full thread depth is the depth listed to the left and is equal to L1 + L3 in the NPT specs
    1/8        0.237         0.401         0.273
    1/4        0.292         0.533         0.395                                                                      -SFM is the surface feet per minute to run the machine spindle. The program will
    3/8        0.292         0.668         0.407                                                                      use the cutter diameter and this number to calculate the required RPM's. The
    1/2        0.475         0.832         0.534                                                                      values for SFM for different materials are in the Feeds and Speeds chart
    3/4        0.477         1.043         0.553                                                                      on the website or in the brochure. For pipe threads multiply the speed by .7
    1"         0.593         1.305         0.661                                                                      -Feed per tooth is the chipload per tooth required for that specific material. The
   1-1/4       0.595         1.650         0.681                                                                      values for specific cutter diameters are listed in the Feeds and Speeds chart.
   1-1/2       0.595         1.889         0.681                                                                      For pipe threads, multiply the chipload per tooth by .7
    2"         0.596         2.362         0.697                                                                      -The number of flutes can be found on the product offering/price list. The program
                                                                                                                      will use this, the RPM's and "/tooth to calculate the required inches per minute to
                                                                                                                      cut the thread.

                                             SPEED & FEEDS FOR UN , NPT & NTPF THREAD MILLS
      WORKPIECE                Speed                             FEEDRATE (inches/tooth) Tool Cutting Diameter
       MATERIAL                 SFM             1/8         3/16         1/4        5/16        3/8            1/2                          5/8
Aluminum                     800-1400       .0005-.001  .001-.0015 .0015-.0025 .002-.003    .003-.0045    .0035-.0055                    .005-.007
Magnesium                    800-1400       .0005-.001  .001-.0015 .0015-.0025 .002-.003    .003-.0045    .0035-.0055                    .005-.007
Brass                         600-800       .0005-.001  .001-.0015 .0015-.0025 .002-.003    .003-.0045    .0035-.0045                    .005-.006
Bronze                        500-600       .0005-.001  .001-.0015 .0015-.0025 .002-.003    .003-.0045    .0035-.0045                    .005-.006
Hard Bronze                   200-300      .0004-.0008 .0007-.0012    .001-.002  .001-.002 .0015-.0025      .002-.003                    .003-.004
Low Alloy Steels <25Rc        350-500       .0005-.001  .001-.0015 .0015-.0025 .002-.003 .0025-.0035        .003-.004                    .004-.005
High Allow Steels >25Rc       250-400      .0003-.0006  .0005-.001 .0008-.0015 .001-.002 .0015-.0025        .002-.003                    .003-.004
Stainless                     150-250      .0004-.0008  .0006-.001   .001-.0015 .0015-.002 .0015-.0030     .002-.0035                    .003-.004
Cast Iron - Soft              250-350      .0004-.0008 .0007-.0013 .0007-.0013 .0015-.002    .002-.003      .002-.004                    .003-.005
Cast Iron - Hard              200-300      .0003-.0006  .0005-.001 .0008-.0015 .001-.002 .0015-.0025        .002-.003                    .003-.004
Titanium                      80-150       .0003-.0006  .0005-.001 .0008-.0015 .001-.002 .0015-.0025 .0015-.0025                        .0025-.0035
Inconel                       60-100       .0003-.0006  .0005-.001 .0008-.0015 .001-.002 .0015-.0025 .0015-.0025                         .002-.003
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