New bowl turner - Lathe RPM and Bowls

Discussion in 'Newbie' started by Ron Robbins, Apr 23, 2012.

  1. robo hippy

    robo hippy

    Joined:
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    Eugene, OR
    Rob,
    Probably # 1 cause of catches is having the flutes of the gouge too vertical, and the wing will catch. This happens mostly on the inside of the bowl, and most often in the transition area going from the side of the bowl to the bottom. Most of us in our earlier turning days made bowls with steep sides, and a fairly sharp transition area. This style has been referred to as a 'dog bowl'. One of my favorite personal bowls is this design. Having a more open/flatter design with a smooth even curve is a lot easier to do. A sharp[ transition area is difficult to get a tool through. Roll the flutes away from the wood you are turning.

    If you go to You Tube and type in robo hippy, I have a couple of clips up that might show this better than I can explain it in words.

    robo hippy
     
  2. hockenbery

    hockenbery AAW Advisor Staff Member

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    And maybe #2 is having the tool rest too low.
    Basically if the wood can drive onto the tool it will.
    I have my students set the tool rest so that the tool is cutting on center with the handle parallel to the floor.
    It is a good starting point.

    Have fun
     
  3. Thomas Stegall

    Thomas Stegall

    Joined:
    Feb 3, 2011
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    Niles, IL
    Robo,

    He said tear out not catches. If you have a lot of tear out with a shear scraping cut vs. only a small amount of tear out, one of four possible things are going on. 1) You are making the cut in the wrong direction relative to the grain structure. With many woods, they shear scrape better in one direction than the other. 2) You are appying to much pressure. Shear scraping works better as a final cut vs stock removal. 3) Your gouge may not be ground/sharpened/shaped properly (common with new bowl turners) 4) Some wood species just don't seem to cooperate with scraping at the end grain as much as others.
     
    Last edited: May 4, 2012

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