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IndustryArena Forum > MetalWorking Machines > CNC Swiss Screw Machines > Star sa 12 broken drill detector
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  1. #1
    Join Date
    May 2003
    Posts
    323

    Star sa 12 broken drill detector

    Do you guys have any suggestions.
    What i can buy to put in machine and detect for broken drill on a axis.

    Drill size .016

    Thanks

  2. #2
    Join Date
    Oct 2011
    Posts
    0
    Buy an operator with a good eye and attention to detail

  3. #3
    Join Date
    May 2003
    Posts
    323
    How is an operator going to save the tool in blink of an eye.

    Operator would say ooooppppps i did not catch it.

    There goes 100.00 tool.

    Great Job Operator.

  4. #4
    Join Date
    Oct 2011
    Posts
    0
    Nothing you put in the machine is going to save the drill in a blink of an eye either.

    You may save a few scrap pieces at most.

    Id be looking into making your hundred dollar tooling work before you drop thousands to simply detect if it broke or not.

  5. #5
    Join Date
    May 2003
    Posts
    323
    Its not the 100 dollar tool that breaks its the .016 dia drill before it
    I have set a tool live counter to to avoid breakage but that's not 100%

  6. #6
    Join Date
    Apr 2009
    Posts
    101
    We have a Middex WK2 on our 20mm machine.

    It works well as described, easy to interface in the machine. Each check is also very quick (<1 second).

    I would have to agree with the idea of solving the root cause. I rarely even add the M code to check drills anymore, I just have the drill cycles tuned to avoid breaking drills. It took a lot of work to get there, however.

  7. #7
    Join Date
    May 2003
    Posts
    323

    Detector

    Thanks for the info.
    I investigated the drill breakage.
    I even changed cutting oil to coolant and guess what on oil the same drill lasted 20-40 pcs.
    On coolant 140 -200

    Yes i even recorded every change to the program speed, feed, drill type.
    To make sure everything by the book

    Custom macro drilling

    OR

    I MAYBE I SHOULD PUT OPERATOR ON IT TO WATCH IT


    Best

  8. #8
    Join Date
    Apr 2009
    Posts
    101
    What material are you working with?

    What tool are you using to spot drill?

    Maybe some of the guys here could make some recommendations.

  9. #9
    Join Date
    May 2003
    Posts
    323

    tools

    TOOLS USED

    CDRILL

    DRILL .055

    DRILL .0160

    ANY SUGESTIONS HOW TO VERYFY FOR BROKEN DRILL

    CAN I PUT A MICRO SWITCH TO CHECK THAT SMALL DRILL
    Attached Thumbnails Attached Thumbnails DRILLING.jpg  

  10. #10
    Join Date
    May 2003
    Posts
    323
    Did anyone ever added a micro switch to check the drill.

    How to do it?

  11. #11
    Join Date
    Jan 2005
    Posts
    304
    If you are relying on the point of the .055" drill to be the spot for your .016" drill you will have constant trouble. You need to look at what make "first contact" when the small drill hits material. The point of the larger drill will leave a small FLAT at it's tip and the tiny drill will hit that, and start walking, then break. Oil lubricates, coolant cools! This means that with oil you may need to pull out more often to cool the tool.

  12. #12
    Join Date
    May 2003
    Posts
    323

    Drill tip

    I am using coolant

    .055 drill is 118 deg
    .016 drill is around 121 deg

    When measuring flat tip of .055 drill it is .014 wide
    on .0156 it is .005 wide

    It looks to me that the .016 drill starts to cut on dia first.

    I measured it on cmm.
    Attached Thumbnails Attached Thumbnails drill tip.jpg  

  13. #13
    Join Date
    Feb 2008
    Posts
    267
    For the breakage you could use this type of "signature" based detection.
    I've never used it, but have heard it has great ability to detect small changes in a given process.

    This Mitsubishi product does a great job for starting small drills.
    This I have tried and it works as described.

    HTH!
    Good luck!
    Control the process, not the product!
    Machining is more science than art, master the science and the artistry will be evident.

  14. #14
    Join Date
    Feb 2008
    Posts
    267
    Quote Originally Posted by ChrisW View Post
    Did anyone ever added a micro switch to check the drill.

    How to do it?
    I've not done it but what you would do is...

    Add a micro switch (normally closed)
    Wire an Mcode to the switch input.
    Connect the output to and external alarm terminal.
    Position the tool and touch the switch.
    Fire the Mcode.
    If the tool not broken, the Mcode will stop at the switch which is now open.
    If the tool is borken, it will pass through to the alarm and stop the machine.
    Control the process, not the product!
    Machining is more science than art, master the science and the artistry will be evident.

  15. #15
    Join Date
    Jul 2006
    Posts
    65
    Caron Engineering (CARON Engineering : Tool Monitor Adaptive Control System (TMAC) protects your CNC machine) makes alot of differant options for tool monitoring, and breakage detection. But the cost gettings something that is non contacting, that will work they way you would probably want it to, will probably be more than your machine is worth. I'd try to stop breaking drill's before bothing with checking, which I know is easier said then done, especially with that A-Arm, which floats all over the place, and and a real pain the align perfectly with spindles...

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