Welcome To Signs101.com: Largest Forum for Signmaking Professionals

Signs101.com: Largest Forum for Signmaking Professionals is the LARGEST online community & discussion forum for professional sign-makers and graphic designers.

 


  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Tap and Die Question

Discussion in 'General Signmaking Topics' started by ams, Sep 19, 2018.

  1. ams

    ams Very Active Member

    2,219
    298
    83
    Oct 28, 2010
    Virginia
    I am putting in a 1/4-20 tap into 1/2" acrylic that is 3/8" deep. I've tried using a cone shaped tap and it's got too much of a taper on it, so after research apparently I need a bottoming tap.

    Amazon carries a set of 3 taps, one of which is bottoming, but I don't think I need the other two since they taper. I found a single one on Grainger, just the flat bottoming one, so I really don't need the taper ones correct? I don't think they work with 1/2"

    tapdie1.jpg

    tapdie2.jpg
     
    Tags:
  2. Joe House

    Joe House Active Member

    886
    188
    43
    Feb 5, 2004
    WA
    You should be able to find a 1/4-20 bottoming tap at your local Ace or True Value store. It's a pretty common size. Sometimes it's easier to just go put eyes on the thing. Also, you may need to start it with the normal tapered tap just to get some light threads started.
     
  3. bob

    bob Major Contributor

    5,257
    303
    83
    Nov 4, 2005
    earth
    Why a bottom hole? Why not a through hole, far simpler to tap. A bottoming tap is a b1tch to start, usually you start with a tapered tap and then finish with a bottoming tap.
     
    • Like Like x 1
    • Agree Agree x 1
  4. ams

    ams Very Active Member

    2,219
    298
    83
    Oct 28, 2010
    Virginia
    I can't do a through hole, it's separate letters and a routed graphic and all, like 30 pieces. All local stores only have taper, so I ordered a bottom one on Amazon
     
  5. Nuagedesigns

    Nuagedesigns Member

    267
    6
    18
    May 7, 2007
    Seymour, CT
    Take A tapered tap also known as a gun tap and take to belt sander. Lightly grinding away the tapered tip do not burn use water to cool at intervals. Now you have a bottoming tap that will actually tap threads all the way to the bottom. Always use a tapered tap first and bottoming tap second to assure your threads are straight.
     
    • Agree Agree x 1
  6. ams

    ams Very Active Member

    2,219
    298
    83
    Oct 28, 2010
    Virginia
    That is an idea, but at $5 for the tap, I might as well buy it
     
Loading...

Share This Page

 


Loading...