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IndustryArena Forum > MetalWorking > MetalWork Discussion > When to use forming tap
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  1. #1
    Join Date
    May 2008
    Posts
    666

    When to use forming tap

    I would like to know when it is best to use ordinary tap or forming tap.

    What condition should be considered to use a forming tap, is it the futur of tapping?

    Do they provide better result when you need 2A tapped hole.

    At the end, is the result always better with forming tap.


    Thanks for your time.


    Jeff

  2. #2
    Join Date
    May 2004
    Posts
    4519
    As almost all machining, this does not have one simple answer that covers every situation.

    Forming taps can be preferred when tapping blind holes because essentially there are no chips.

    Forming taps can also be preferred when tapping "softer" metals because the forming (actually extruding) action somewhat work hardens the metal making stronger threads.

    Forming taps apply more cutting forces to the material and to the tool, which can lead to tool breakage. Forming taps generally take more horsepower because of this.

    Cutting taps (what you call ordinary taps) make chips. Chips can bind the tap causing breakage.

    Forming taps make more consistent threads than cutting taps.

  3. #3
    Join Date
    Apr 2006
    Posts
    3206
    Here's a little overview for you....as noted, forming torque is higher, but I have NEVER had a problem with that, in copper, brass, aluminum, or stainless steel.

    Threads Will Roll

    I love forming taps whenever I can use them. They are more expensive, but the biggest issue is controlling the drill diameter. It is critical. Little variations in hole diameter translate into Big variations in the thread height.

    I've tapped hundreds of class 3 0-80 blind threads in 304 SS with a forming tap.
    One thing I love is the increased strength of the threads and the beautiful finish.

  4. #4
    Join Date
    May 2008
    Posts
    666
    Thanks for those replies guys, really appreciated.

    Is it always accepted by the industry, does the thread have the same specification, like if I use a thread gauge to inspect a hole tapped with a forming tap, say a 1\4-20 2A, will it be accepted by all your clients.


    Again, thanks a lot.


    Jeff

  5. #5
    Join Date
    Mar 2007
    Posts
    2083
    Hi Jeff


    a "friction drill" and a thread forming tap ( or thread forming screws eg taptite ) are used to produce a strong thread in thin metal

    John

  6. #6
    Join Date
    May 2004
    Posts
    4519
    @Jeff - Yes. Unless specified differently on the print, threads should be considered to be to industry standards and you would use the same thread gage for checking.

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