Announcement

Collapse
No announcement yet.

Correct size Pilot Hole for #8 screw

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • Correct size Pilot Hole for #8 screw

    Hey, I know it is a silly question but thought someone might know the correct size pilot for the PE #8 x 1" Deep Thread Pan Head Screws Black into MDF. for attaching the drivers.

    http://www.parts-express.com/pe/show...number=081-425

    I just want to get it right since the tweeter is near the edge of the mounting hole. Almost done with the RB's. The paint job is not perfect but good enough for me.
    cuggie
    "What's Time To A Pig?"

  • #2
    Re: Correct size Pilot Hole for #8 screw

    http://www.engineershandbook.com/Tab...pilotholes.htm
    Facebook Page - Ocean State Acoustics

    Comment


    • #3
      Re: Correct size Pilot Hole for #8 screw

      Originally posted by cuggie View Post
      Hey, I know it is a silly question but thought someone might know the correct size pilot for the PE #8 x 1" Deep Thread Pan Head Screws Black into MDF. for attaching the drivers.

      http://www.parts-express.com/pe/show...number=081-425

      I just want to get it right since the tweeter is near the edge of the mounting hole. Almost done with the RB's. The paint job is not perfect but good enough for me.
      cuggie
      Fow what it's worth, most drivers take a number 6/8, so I keep the 7/64" and 1/8" bits handy. Sometimes a little smaller bit for a #6, depending on the screws, but those are my most popular.
      Later,
      Wolf
      "Wolf, you shall now be known as "King of the Zip ties." -Pete00t
      "Wolf and speakers equivalent to Picasso and 'Blue'" -dantheman
      "He is a true ambassador for this forum and speaker DIY in general." -Ed Froste
      "We're all in this together, so keep your stick on the ice!" - Red Green aka Steve Smith

      *InDIYana event website*

      Photobucket pages:
      http://photobucket.com/Wolf-Speakers_and_more

      My blog/writeups/thoughts here at PE:
      http://techtalk.parts-express.com/blog.php?u=4102

      Comment


      • #4
        Re: Correct size Pilot Hole for #8 screw

        If I don't know what size hole to drill. I usually hold the screw up to light. Look at the shaft of the screw, solid part without the threads. Hold a drill bit up in front of it, right against it, until you find one that is the same size. That way when you screw the screw in the hole only the threads bite. To small of a hole will mushroom out the MDF. To big of a hole you won't get a good bite.
        Dave
        http://www.pellegreneacoustics.com/

        Trench Seam Method for MDF
        https://picasaweb.google.com/101632266659473725850

        Comment


        • #5
          Re: Correct size Pilot Hole for #8 screw

          Safest route: Do a test in a scrap piece of MDF. Pick a couple of drill bits (I use Davepellegrene's method, or measure with calipers). Drill a hole with each bit, then drive some screws in. Pick the best one to use on your project.
          Statements: "They usually kill the desire to build anything else."

          Comment


          • #6
            Re: Correct size Pilot Hole for #8 screw

            Originally posted by davepellegrene View Post
            If I don't know what size hole to drill. I usually hold the screw up to light. Look at the shaft of the screw, solid part without the threads. Hold a drill bit up in front of it, right against it, until you find one that is the same size. That way when you screw the screw in the hole only the threads bite. To small of a hole will mushroom out the MDF. To big of a hole you won't get a good bite.
            Dave

            This was what I was taught in shop class -- 'O so many years ago. I thought going with the smaller hole was being more conservative. But the logic of the small hole compressing/mushrooming out the MDF makes sense.

            Comment


            • #7
              Re: Correct size Pilot Hole for #8 screw

              Originally posted by jclin4 View Post
              This was what I was taught in shop class -- 'O so many years ago. I thought going with the smaller hole was being more conservative. But the logic of the small hole compressing/mushrooming out the MDF makes sense.

              I too will start with a smaller hole if not sure. I also found out the hard way if you drill to small of a hole in hardwood you end up twisting the head off of the screw. Especially the little ones. Hate that.
              Dave
              http://www.pellegreneacoustics.com/

              Trench Seam Method for MDF
              https://picasaweb.google.com/101632266659473725850

              Comment

              Working...
              X