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Thread: Drill Press Size Clarification

  1. #1
    Join Date
    Mar 2007
    WNY, Buffalo Area

    Drill Press Size Clarification

    My understanding of Drill Press sizes was that you take the inch size (12in, 16in etc...) and divide it by 2. This is will be the distance between the post and the center of the chuck/drill bit. With a 16in DP you could drill into the center of a 16in wide piece of stock (hole at 8in). I have a Delta 12in bench top model and it is 6in from the post to the center of the chuck.....I just measured after reading the information below.

    I receive the free Woodworker's Jounal eZine. I was looking through it and saw the following question and answer on drill press size, and it baffeled me.

    Was my original understanding correct, and they are wrong? Or am I wrong and Delta mis-printed my 12in DP, as it should be a 6in DP?

    I'm pretty sure I'm right (like 99.5%), but they are the magazine people, so......

    Q: The advertisements for drill presses say 10-inch,12-inch, 15-inch and so on. To what does that measurement refer?

    Andy Rae: Like a band saw, the measurement refers to the distance from the business end of the tool — in your case, the centerline of the quill, chuck, or drill bit — to the post. For example, on a 12-inch drill press, you should be able to drill into the middle of a 24-inch wide panel. Be advised that the manufacturer’s stated size is nominal; your actual drilling capacity may vary by an inch or so.

    Richard Jones: The distance between the pillar and the centre of the chuck.
    We create with our hands in wood what our mind sees in thought.
    Disclosure: Formerly was a part-time sales person & instructor at WoodCraft in Buffalo, NY.

  2. #2
    Join Date
    Nov 2006
    Monroe, MI
    Either you are right and they are wrong, or Steel City just ripped me off

  3. #3
    Join Date
    Nov 2006
    Mountain Home, Arkansas
    My Grizzly is rated as a 14" swing but measures 7" from center of chuck to post. It there a standard for describing this?
    "Folks is funny critters."

    Think for yourselves and let others enjoy the privilege to do so, too. ~Voltaire

  4. #4
    Join Date
    Dec 2006
    Floydada, Tx
    Well if they are correct, then both my 9" and 16.5" DP are miss labled. The 9" measures 4.5" and the 16" .5 measures 8.25". That would be nice if they whork the way they stated. Could you imagin the size of some of these DP if that was correct?

  5. #5
    Join Date
    Jan 2007
    Honolulu, Hawaii

    Drill Press Size Clarification


    As you stated, you are correct. In my case, my Delta 14" measures about 7 1/8" post to chuck center, and my 22" Duracraft measures 11" post to chuck center.

    The calculation is the same as for a lathe swing. The distance between the bed and the centerline of the spindle or chuck equals 1/2 of the swing. (5" distance = 10" swing)

    Those other guys have been misinformed.

    Aloha, Tony
    Last edited by Tony Baideme; 08-15-2007 at 09:29 PM.
    "You got to learn from the mistakes of others. You won't live long enough to make them all yourself". (Author unknown)

    "Time flies like..... an arrow,,,Fruit flies like..... a banana." Groucho Marx

    Ah,,,to live in Paradise!

    Registered voting member

    Fighting for all I am worth, and praying every day.

  6. #6
    Join Date
    Apr 2007
    No, not all of SoCal is Los Angeles!
    Your divide by 2 method is correct although like in bandsaws, they fudge a bit now and then.
    Any sufficiently advanced technology is indistinguishable from magic.
    - Arthur C. Clarke

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