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The Woodturning Forum - Woodturner's Resource › Woodturning Forum › Tips & Techniques › Gouge grind for the transition cuts of a bowl

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Gouge grind for the transition cuts of a bowl (Read 720 times)

Breck Whitworth

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Gouge grind for the transition cuts of a bowl
04/05/12 at 07:46:47

I have been using a 1/2" DEEP V fluted gouge with a traditional grind for the transition cuts from the sides of the bowl to the middle. Do any of you feel the u-shaped gouge with the traditional grind works better for this? And any tips on sharpening the traditional grinds to make them better at thoses transition cuts would be appreciated. Also how do each of you sharpen your traditional grinds (bottom feeders)

May the Lord Bless the work of our hands! And Necessity is the mother of invention:

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Bill Bolen

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Re: Gouge grind for the transition cuts of a bowl
Reply #1 - 04/05/12 at 08:29:17

I generaly use a re-ground 1/2 bowl gouge with the traditional grind inside bowls most especially that transition point from walls to the bottom of the bowl. The important thing here is the angle of the bevel. A blunt angle at 60* to 70* will help you manage that transition right across the bottom. You might want to go to the Dway site and look at his bowl gouges. My gouge is shaped much like his "bottom feeder" and should give you a good idea of the angle required.

« Last Edit: 04/05/12 at 08:31:19 by Bill Bolen »

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robo_hippy

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Re: Gouge grind for the transition cuts of a bowl
Reply #2 - 04/05/12 at 11:07:25

Getting through the transition and across the bottom of the bowl is probably about 70% bevel angle, and 30% flute design. With a 45 degree bevel, you can go down a 45 degree cone easily. You can go down the walls, but not make the transition without coming off the bevel. The bottom feeder/traditional type of gouges are ground similar to the spindle roughing gouge, almost square across the top/nose, with little or no sweep/wings. They have a more blunt angle, in the 60 to 70 or even 80 degree range. This keeps the handle away from the bowl rim as you turn, and you can keep the bevel rubbing through the cut.

The difference between a V and a U or even ) shaped flute is how you cut with it. On the inside, you have the handles more level because the tool rest and bowl rim tend to get in the way. You also have the flutes more on the side rather than up and down. So, when you roll the gouge on the side, a V gouge has a very small sweet spot for cutting and a ) shaped flute has a large area for cutting. I prefer the fluteless gouge from Doug Thompson, which is very similar to the bowl skew (Dave Hout I think) and a few others. It was a new tool to me, but apparently has been around a long time. The traditional gouge can be a bit more flute up when making the cut, but most of the cutting is going on at the center of the flutes, and just a tiny bit on the up hill side.

robo hippy

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Al Wasser WR Supporter Offline WR Rocks! Posts: 176 Gender:	Re: Gouge grind for the transition cuts of a bowl Reply #3 - 04/05/12 at 11:37:42 Breck, I've not turned to number of bowls that Robo has and probably never will. I have 6 or so bowl gouges. I find the Thompson 5/8" U gouge the best for the bottoms and leading into it. It's ground at 60. Sometimes nothing seems to get the smoothness I want and 3/4" round nose scraper works well.
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Larry Matchett WR Supporter Offline Be One with your Tool! Posts: 922 Gender:	Re: Gouge grind for the transition cuts of a bowl Reply #4 - 04/05/12 at 13:05:47 Breck, I generally use a 3/8 traditional grind. When I get in trouble there is always the EWT finisher but I still like the final cuts to be made with the bowl gouge.
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Breck Whitworth

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Re: Gouge grind for the transition cuts of a bowl
Reply #5 - 04/05/12 at 13:44:34

I have been using a 50 degree traditional grind and seems to handle the transition cuts for me fine, but I notice that as I sharpen it for each bowl and sometimes twice I probably need a little advice on sharpening. I think I will take my gouge to the club meeting on sharpening and see if I can get better at what I need to do. I would really like a 60 degree bottom feeder as well as my 50 degree one. Oh and by the way where can I see a fluteless gouge. The web address for doug's tools doesn't show that particular tool. Or at least I can't seem to find it. Any help there would be appreciated. Robo thanks for your info, as always it is just what I needed to hear.

May the Lord Bless the work of our hands! And Necessity is the mother of invention:

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Mike Baber WR Addict WR Supporter Offline When all else fails, ask someone who knows! Posts: 5952 Gender:	Re: Gouge grind for the transition cuts of a bowl Reply #6 - 04/05/12 at 14:24:09 Here's some pictures of Doug's flute less gouge. Its 12 1/8" OA w/out a handle and 7 1/4" on the flat.
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Larry Matchett WR Supporter Offline Be One with your Tool! Posts: 922 Gender:	Re: Gouge grind for the transition cuts of a bowl Reply #7 - 04/05/12 at 17:36:37 Multimedia File Viewing and Clickable Links are available for Registered Members only!! You need to or Here is page with the bottom feeders.
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