1. Join the Go-To Source for Woodturners!

    Please read the new sticky announcement here for full details.

    Dismiss Notice

Bowl Gouge Flute Shapes

Discussion in 'Newbie' started by Ed Nygard, Oct 4, 2017.

  1. Ed Nygard

    Ed Nygard

    Joined:
    Oct 3, 2017
    Messages:
    3
    Location:
    Chehalis, WA
    Bowl gouge flutes are variously labeled “V-shaped”, “U-shaped”, “Parabolic-shaped”, and “Compromise-shaped”, etc. I’d be interested in users’ experience with the different styles of flute and what makes any one more suitable for a given type of turning. This is closely related to the different possible grinds, which should be considered as well in responding. Thank you.
     
  2. Bill Boehme

    Bill Boehme Administrator Staff Member

    Joined:
    Jan 27, 2005
    Messages:
    8,505
    Location:
    Dalworthington Gardens, TX
    Home Page:
    There are some recent threads discussing this topic. I believe that the answer is personal preference. Everybody has a reason that they like a particular flute shape. However, different flute shapes can fill a need for a particular purpose such as a "bottom feeder" or hogging out wood or shear cutting. Personally, I don't like the narrow V flutes nor the broad U flutes, but that's just me and my two cents.
     
    odie likes this.
  3. john lucas

    john lucas AAW Forum Expert

    Joined:
    Apr 26, 2004
    Messages:
    6,052
    Location:
    Cookeville TN USA
    I love my V shaped Thompson. I also have an older HSS tool that has a deep wide flute. I like it for certain pull cuts because the way I sharpen it the "wings" are very thin and super sharp. Flute shape is a discussion that can go on forever. I think basically it's the shape you use the most. That's the one you learn to use and sharpen and consequently like the best.
     
    Bill Boehme likes this.
  4. hockenbery

    hockenbery AAW Advisor Staff Member

    Joined:
    Apr 27, 2004
    Messages:
    4,504
    Location:
    Lakeland, Florida
    Home Page:
    Flute shapes become important for certain grinds and certain cuts.
    Flute shape is less important if you don’t use a grind or cut tha works better with a particular flute.

    I like the parabolic flute or the super flute for the Ellsworth grind and find it produces a better profile and more usable edge.
    I use a shear cut with the leading edge of the wing. This cut is easy for me with a parabolic flute. Really challenging with a fee flute.

    Vee flutes are nice for pull cuts and peeling cuts which use only the wing.

    My favorite gouge has become the Jamieson mae by Thompson.
    The flute takes the Elsworthnquite nicely.
    I also have a Thompson Vee I just use for roughing and for some pull cuts this gouge is just too point for me.
    I also have a bunch of Henry Taylor gouges and a crown with thenparabolic flute.
     
    Bill Boehme likes this.
  5. robo hippy

    robo hippy Barely Scraping By

    Joined:
    Aug 14, 2007
    Messages:
    1,921
    Location:
    Eugene, OR
    I tend to hold my gouges more level for finish cuts as opposed to the dropped handle cuts that many use. For my style, the more open flutes like the U and parabolic work better for me because they give the nose a bigger sweet spot. I don't use a swept back grind at all any more. I use scrapers for all of my roughing cuts, and for all of my shear scraping. My go to scraper is a Big Ugly tool that is 1 inch wide and 3/8 thick. I can easily stall my 3 hp Robust with it. I am a bit of a brute... I did try the V from Glaser long time ago, and it was way too deep of a V and plugged up a lot. Doug's V is more open than the Glaser.

    robo hippy
     
    Zach LaPerriere likes this.
  6. Mike Devers

    Mike Devers

    Joined:
    Nov 20, 2017
    Messages:
    7
    Location:
    Millbrook, Alabama
    Was thinking of making my own tool. Will a ball endmill cut an acceptable flute in hss? Or is a different type of endmill used to do this?
     
  7. john lucas

    john lucas AAW Forum Expert

    Joined:
    Apr 26, 2004
    Messages:
    6,052
    Location:
    Cookeville TN USA
    I made mine using a round over mill. The finish on the inside of mine sucks but then I'm not a good machinist and don't have quality equipment to do the job. It does work and lets me play with shapes to learn more about flute shapes and that's why I tried making my own. Ideally a horizontal mill with a custom made cutter so you could make V, U or other shapes or possibly a surface grinder with a custom ground stone for finishing.
     
  8. hockenbery

    hockenbery AAW Advisor Staff Member

    Joined:
    Apr 27, 2004
    Messages:
    4,504
    Location:
    Lakeland, Florida
    Home Page:
    odie, Bill Boehme and Gary Beasley like this.
  9. Mike Devers

    Mike Devers

    Joined:
    Nov 20, 2017
    Messages:
    7
    Location:
    Millbrook, Alabama
    Whats the difference between a round over mill and a ball endmill? Im wanting the u shape.
     
  10. Bill Boehme

    Bill Boehme Administrator Staff Member

    Joined:
    Jan 27, 2005
    Messages:
    8,505
    Location:
    Dalworthington Gardens, TX
    Home Page:
    This is what I think of as a corner roundover end mill ... similar to a router radiusing bit.

    image.jpeg
     
  11. Mike Devers

    Mike Devers

    Joined:
    Nov 20, 2017
    Messages:
    7
    Location:
    Millbrook, Alabama
    I think the ball nose end mill would produce
    the result. Here's pic.
     

    Attached Files:

    Bill Boehme likes this.
  12. john lucas

    john lucas AAW Forum Expert

    Joined:
    Apr 26, 2004
    Messages:
    6,052
    Location:
    Cookeville TN USA
    Mike posted what I call a round over bit. A ball end actually looks like a ball. What Bill showed I call a radius bit.
     
  13. Bill Boehme

    Bill Boehme Administrator Staff Member

    Joined:
    Jan 27, 2005
    Messages:
    8,505
    Location:
    Dalworthington Gardens, TX
    Home Page:
    John, the ones that have an actual ball on the end are called undercutting mills or sometimes referred to as lollipop mills.

    The picture that Mike posted is a ball end mill. Woodworkers refer to router bits like that as cove cutting bits or sometimes as veining bits if they are small.

    The one that I posted above is a roundover mill because it is used to round over square corners. Router bits that resemble a roundover mill are called by various names depending on whether they have a bearing, a sharp point, or a square tip, etc.
     

Share This Page