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One way easy core base for a 25" swing lathe

Discussion in 'Woodturning Discussion Forum' started by Breck Whitworth, Nov 16, 2017.

  1. Tom Albrecht

    Tom Albrecht

    Feb 8, 2014
    Midwest USA
    I can go down and measure mine in the a.m., but that's ridiculous that Oneway can't answer the questions by phone. I have had similar issues with them recently, if Kim or her brother are not around when you call it's a problem. (On the other hand, Roger at Craft Supplies is very knowledgeable and helpful). Like a lot of others, I like the Oneway coring system, but their product support videos and and website are a bit dated.
  2. Bill Boehme

    Bill Boehme Administrator Staff Member

    Jan 27, 2005
    Dalworthington Gardens, TX
    Home Page:
    I am not very familiar with the Oneway other than watching another turner show me how it is used. I have the McNaughton coring system, but one thing that all coring systems have in common is that the blades must be a perfectly circular arc so that they won't bind in the kerf.. If I'm not mistaken, because of the support arm curvature, the Oneway coring system has to be set up on or very near centerline. So for a blade of a particular radius, the maximum depth will be the radius minus the distance from the pivot point to the wood. A limitation of the Oneway coring system is that the depth of the core and the diameter are constrained by the blade curvature and the distance from the pivot point to the wood. This means that you wouldn't be able to have a core that is 12" diameter and 3½" deep. However, you aren't necessarily constrained to making only hemispherical bowls ... by making thicker and fewer cores, you will have some latitude in making shallower bowls that are more elliptical or parabolic in shape.

    There is no perfect coring system. The McNaughton gives you a lot more flexibility in choosing the desired depth for a given diameter, but on the other hand it has a very steep learning curve that can drive you crazy. The Oneway is more or less plug and play.
  3. John Spitters

    John Spitters

    May 11, 2011
    Abbotsford B.C.
    The knives of the OneWay easy core have radius’s of 5”, 6 1/4”, 7 1/4” and 8 1/2”
    The pivot point for these radius’s at it’s closest point to the turning blank is 1” outside of the face of the blank. The radius’s on the knives are at the outside diameter of the cut that the knife produces, the cutting tip on the knives are 3/8” thick so you would need to extract this difference from your radius for the cored out blank. So with the largest knife being 8 1/2” less 1” less 3/8” your deepest cored out blank will be 7 1/8” max, but let’s just call it 7”.

    As a side note:
    With the OneWay system the knives can be moved of center by approx. 1” +/- from the center point of your turning blank. So the largest knife can yield a core of up to 18” diameter and as small as 15” diameter yet the maximum depth of the cored blank will not exceed 7”.
    Last edited: Dec 6, 2017
    Owen Lowe and Bill Boehme like this.
  4. Breck Whitworth

    Breck Whitworth

    Nov 1, 2013
    Gulfport, MS
    Home Page:
    Thanks John and all that have given me input on these questions I had!

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