My First Programmed Mill Part - Part with holes

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For preparing and milling operations follow these steps:

  1. Make sure the Mill is in clean condition and ready for use. Follow the Maintenance and Cleaning Steps taped on the side of each mill in the Machine Shop.
  2. Obtain a 3”x 2”x .25” Aluminum 6061 stock, or a larger size stock.
  3. Place 1/8” X 1 ½” X 6” parallels on vise and set piece on top oriented as shown on part diagram. Ensure at least half the height of piece is exposed and remaining part is held by vise. About 0.25” of part should stick out from the side of the vice.
  4. Load 2 - Flute 1/2” End Mill and climb mill 0.02” from side sticking out.
  5. Turn part and climb mill opposite side to dimension part. Note: Consult TA or instructor before conducting both operations if you are unsure of how to proceed.
  6. Load Edge Finder and set origin on top left corner of the piece against the fixed jaw of the vise.
  7. Erase old program: Press** MODE – EDIT – ERASE PROG- YES**
  8. Confirm mill is set to 2 axis mode. If in 3 axis, press SYS – GO TO 2 AXIS – MODE
  9. Set up the tools. Press MODE – SET UP – TOOL TABLE
  • Use the DATA UP and DATA DOWN Keys to scroll to Tool #1.
  • For TOOL DIAMETER, type 0.25 and press ABS SET
  • Press 1 - ABS SET for drill
  • Repeat the same for Tool #2.
  • Repeat the same for Tool #3, setting diameter to .113
  • Repeat the same for Tool #4, setting diameter to .5

    10. Programming the drill events:

  • Press** PROG – GO TO BEGIN – POSN DRILL**
  • For “X End”, type 0.625 and press ABS SET
  • For “Y End”, type -0.3725 and press ABS SET
  • For “RPM” type 1500 and press ABS SET
  • For “Tool #”, type 1 then press ABS SET
  • Press POSN DRILL
  • For “X End”, type 2.375 and press ABS SET
  • For “Y End”, type -1.625 and press ABS SET
  • For “RPM” type 1500 and press ABS SET
  • For “Tool #”, type 1 then press ABS SET
  • Press POSN DRILL
  • For “X End”, type 0.625 and press ABS SET
  • For “Y End”, type -1.625 and press ABS SET
  • For “RPM” type 1500 and press ABS SET
  • For “Tool #”, type 2 then press ABS SET
  • Press POSN DRILL
  • For “X End”, type 2.375 and press ABS SET
  • For “Y End”, type -0.375 and press ABS SET
  • For “RPM” type 1500 and press ABS SET
  • For “Tool #”, type 2 then press ABS SET
  • Press POSN DRILL
  • For “X End”, type 1.5 and press ABS SET
  • For “Y End”, type -1.375 and press ABS SET
  • For “RPM” type 2000 and press ABS SET
  • For “Tool #”, type 3 then press ABS SET
  • Press POSN DRILL
  • For “X End”, type 1.5 and press ABS SET
  • For “Y End”, type -0.625 and press ABS SET
  • For “RPM” type 2000 and press ABS SET
  • For “Tool #”, type 3 then press ABS SET
  • Press POSN DRILL
  • For “X End”, type 1.5 and press ABS SET
  • For “Y End”, type -1.00 and press ABS SET
  • For “RPM” type 1000 and press ABS SET
  • For “Tool #”, type 4 then press ABS SET
  • Press LOOK to confirm profile

    11. Checking tool path exists:

  • MODE – SET UP- TOOL PATH. Note: Consult a TA or instructor if an error message appears

    12. Selecting tools:

  • “1/8”, “5/16”, “1/2” drill bits and 5/16 - 18 tap and corresponding drill bit. Refer to charts on side of lathe cabinet for correct size drill bit.
  • Drill Chuck
  • 1/4” and 3/8” Center drills.

    13. Conducting a trial run:

  • Load 1/4” Center drill
  • Close guard doors
  • Note: The spindle must be retracted such that tool is above part/vise surface before carrying out the trial run)
  • Press MODE – RUN – TRIAL RUN – GO
  • Ensure that the machine follows the correct tool path

    14. Running the program:

  • Close guard doors
  • Press** MODE – RUN – START - GO**
  • Start the spindle, adjust the air then press GO for “CNC RUN”. Make sure tool is retracted above work piece/vise before hitting GO
  • When prompted Set Z, drill a center drilled hole with major diameter less than given hole dimension. Use 1/4” Center Drill for the first 6 events.
  • Retract the spindle after each centert drill event and before pressing GO to avoid crashing tool on vice or part during rapid feed.
  • For event #7, load 3/8” center drill when prompted to LOAD TOOL #4. Press GO and drill. Note: If not enough room to load tool, close guard door and press STEP Z – STEP UP to move spindle up, then press STEP DOWNwhen finished. Press RETURN to run program
  • After program runs over, press MODE – DRO and load Drill Chuck.
  • Ensure Drill Chuck is about 3” above work piece
  • Rerun the program
  • When prompted to LOAD TOOL,secure respective drill bit firmly on chuck using the Spindle Break.Use the STEP-Z feature as necessary.
  • Drill the hole ensuring that the spindle is raised after each event to avoid crashing tool on part or vice during rapid feed. Ensure that the air is on, and drip coolant into the drill hole as necessary.
  • Close guard doors and press GO to position drill then drill through.
  • Turn off spindle and air.

    15. Tapping

  • Rerun events 3 and 4
  • Press MODE-RUN-START EVENT #-3-ABS SET
  • Press GOand load the Spring Loaded Centerwhen prompted to LOAD TOOL #2.Note: DO NOTturn on the spindle for tapping event
  • Close guard doors and press GO.
  • Secure tap on a tap handle and align it on the hole using the Spring Loaded Center
  • Put a few drops of tap fluid on the tap and start threading. Note: Take care not to break tap inside the work piece. Consult TA or instructor
  • Press MODE after event 4 in order to stop the program
  • Unclamp part and use a Deburring Tool to remove sharp burrs from part edges and Counter Sinks to remove burrs from the holes.
  • Your part is ready for inspection
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