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Thread: Drilling holes in spheres

  1. #1
    Supporting Member mklotz's Avatar
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    Aug 2015
    LA, CA, USA
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    Drilling holes in spheres

    A friend asked me to drill holes in some wooden spheres. The procedure I used to get the holes on diameter can be used on spheres of almost any diameter and material.

    I drilled holes of diameter a bit smaller than the sphere diameter in some plywood plates. Bolts through these plates and anchored in the mill T-slots allowed me to trap the ball and clamp down on it so it couldn't move under the action of the drill. Here's a view of the setup from above...

    This side view shows the bolts and the way the sphere is trapped...

    and the finished product(s)...

    Once the sphere was clamped, I found its diameter by taking a very slight pass across its top with an endmill. This produced a tiny flat on the top the center of which I eyeballed (hey, it's wood after all). A center in the mill chuck then allowed me to line up on the diameter.

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    Last edited by mklotz; Jul 6, 2017 at 10:39 AM.
    Regards, Marv

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  2. The Following 4 Users Say Thank You to mklotz For This Useful Post:

    jere (Sep 3, 2015), kbalch (Sep 3, 2015), that_other_guy (Jan 7, 2019), Workshopshed (Aug 14, 2016)

  3. #2
    kbalch's Avatar
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    Jun 2012
    Clermont, FL
    Thanked 523 Times in 377 Posts
    Thanks Marv! I've added your Sphere Hole Drilling Method to our Drilling and Drill Presses and Workholding categories, as well as to your builder page: mklotz's Homemade Tools. Your receipt:

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