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  1. #1
    Join Date
    Jun 2008
    Location
    Hill top in East Tn.
    Posts
    228

    Default 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. #2
    Join Date
    Nov 2007
    Location
    Lil' Rhody
    Posts
    3,933

    Default Re: Correct size Pilot Hole for #8 screw


  3. #3
    Join Date
    Sep 2005
    Location
    Indiana
    Posts
    19,854
    Blog Entries
    29

    Default Re: Correct size Pilot Hole for #8 screw

    Quote 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
    "We don't just make a crossover, we make a statement!" - Lawrence Fishburne for Cadillac

    *InDIYana 2014 event*

    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

  4. #4
    Join Date
    Mar 2008
    Location
    Malvern, Ohio
    Posts
    3,430

    Default 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

  5. #5
    Join Date
    Mar 2009
    Location
    CT
    Posts
    776

    Default 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.

  6. #6
    Join Date
    Oct 2005
    Location
    'Upstate' NY
    Posts
    1,823
    Blog Entries
    3

    Default Re: Correct size Pilot Hole for #8 screw

    Quote 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.

  7. #7
    Join Date
    Mar 2008
    Location
    Malvern, Ohio
    Posts
    3,430

    Default Re: Correct size Pilot Hole for #8 screw

    Quote 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

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