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fingernail grind (Read 136 times)
 
Bill Moschler
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fingernail grind
Jul 4th, 2024 at 11:59am
 
As a somewhat struggling wood turner I am really glad to see this forum up and running again. My success of the day is finally figuring out how to grind a fingernail tip on a gouge. Now to figure out how to use it. I am keeping my bottom grinds because I know I can work a transition with them.

I am using white oxide grinding wheel of maybe 100 grit.  Maybe 120.  The tools "seem sharp enough".  I am thinking about a CBN wheel.  What grit?  I am thinking 180 might be good all around?
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Ed Weber
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Re: fingernail grind
Reply #1 - Jul 4th, 2024 at 12:56pm
 
If you get a CBN wheel (which I highly recommend if you continue to turn) a 180 grit is a great all around grit to choose.
!80 grit is coarse enough to "grind" and fine enough to sharpen.
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Bill Moschler
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Re: fingernail grind
Reply #2 - Jul 4th, 2024 at 2:14pm
 
Thanks Ed/

More immediate problem.  My first attempt turning with the new grind was humbling.  Got a lot more to learn and work on here before edge sharpness gets to be the problem.
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Don Stephan
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Re: fingernail grind
Reply #3 - Jul 4th, 2024 at 5:52pm
 
On another forum long time well regarded turner said he felt results the same whether gouge sharpened with 80 grit or much finer grit.

Are you turning bowls?  U, V, or parabolic flute?  Bar diameter?  Shape of the nose?  Green or dry wood?
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David Moeller
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Re: fingernail grind
Reply #4 - Jul 4th, 2024 at 6:22pm
 
I have a 180cbn for light reshaping and agree the edge is adequate for general turning. Especially good for my roughing gouge. My go-to wheel is 600cbn for fine turning such as finials. The honed edge it produces leaves finished cuts requiring little or no sanding.
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Don Stephan
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Re: fingernail grind
Reply #5 - Jul 5th, 2024 at 6:12pm
 
Curious David, would you make a comparison on a test finial with cutting edge sharpened with the two grits of your grinding wheels, compare the results for sanding needed, and report?  I'll try to remember to do the same.
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David Moeller
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Re: fingernail grind
Reply #6 - Jul 5th, 2024 at 6:55pm
 
Having never made a direct comparison HEY!, I'll try it. Have to make some criteria here. Same chisel. My Wolverine will match the grind on both wheels. For me, some Poplar (can be pecky or fuzzy), spindle orientation. Cut some coves the 'wrong' way i.e. uphill. Maybe compare with a sanded section but what grit? By golly, I hope this won't prove me wrong! Undecided
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David Moeller
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Long gone: Shopsmith, Myford ML8, Homebuilt bowl lathe, NOVA benchtop, Delta 46-715 and a Unimat.

Re: fingernail grind
Reply #7 - Jul 6th, 2024 at 4:48pm
 
Spent about an hour this morn comparing cbn 180 & 600.  3"dia air-dry poplar. 1800+rpm. Glazer Stocksdale gouge. Tried various cove, bead, V shapes. 'Detuned' gouge on 180 first then sharpened again at 600. Did that twice.
   Conclusion? Very little difference. Nothing a swipe w/240 paper can't fix. I bow to those who recommend 180 as all around grit. Smiley
   I like to use the 600 to touch up the edge during turning. But that is really splitting hairs (fibers). Roll Eyes

   
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Bill Neff
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Re: fingernail grind
Reply #8 - Jul 7th, 2024 at 9:42am
 
Bill,   Are you using a sharpening system or freehanding the sharpening?  It's much easier for me to sharpen with the wolverine system than free handing.  I know there are turners who have tons of experience with free hand sharpening and can get a good edge, I'm not one of them.
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Bill Moschler
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Re: fingernail grind
Reply #9 - Jul 7th, 2024 at 10:05am
 
Been working on my sharpening skills this week. Yes, I am using the Wolverine jig. I did not understand the adjustments and really messed up some angles. Going to cost me about 3/8" on one gouge. I finally found Dave Thompsons site and instructions for setting up the jig. Going to do it "his way" for a while now before I get experimental again. I have also concluded that I did not really need a long fingernail grind with the side flutes. I do my outside scraping with a Easy Wood carbide now. Getting ready to order a 8" CBN wheel in 180 grit mostly just because I can now. Suggestions on supplier or brand or width? I am an Amazon shopper mostly because of the free shipping but also like to buy from speciality suppliers every once in a while.

Turning and buying tools has been sorta hit or miss over a few years for me. Upon examination I found out for bowl gouges I have three 1/2 inch bowl gouges and no other sizes. One is a Thompson tool set up with their "bottom feeder" grind and it works fine for me. Two are Sorby. I do not understand their sizing designations at all. Both are 1/2 inch diameter. Both say "10 mm". Neither the diameter nor the inside width of the flutes is close to 10 mm on either one. I thought I bought one of them as a "3/8'. Not sure I need any more gouges at this point. Not sure what I would buy if I did. A unhandled Thompson and a handled Sorby are about the same price to my door. I like them both.  I like turning handles a lot.
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« Last Edit: Jul 7th, 2024 at 10:10am by Bill Moschler »  
 
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Ed Weber
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Re: fingernail grind
Reply #10 - Jul 7th, 2024 at 3:54pm
 
Bill Moschler wrote on Jul 7th, 2024 at 10:05am:
Yes, I am using the Wolverine jig.  I did not understand the adjustments and really messed up some angles.


Here is what the adjustments do on a very basic level.
1. Nose angle, by moving the arm in and out
2. Wing angle, by changing the jig angle adjustment
3. Wing length, by changing the amount of protrusion.

Adjustments should be one at a time as each one slightly effects the other two, especially in the transition area between the nose and wing.
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Bill Moschler
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Re: fingernail grind
Reply #11 - Jul 9th, 2024 at 9:58am
 
Thanks Ed. I seem to be a slow learner. But...I think I understand it now. Thanks for the simple explanation. And...for now I am pretty much going to go with the same protrusion and wing angle until I see a need to change it.


I now feel confident enough with the jig and sharpening process that I went ahead and ordered a 180 grit CBN wheel. Not here yet but soon. Maybe today.
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« Last Edit: Jul 9th, 2024 at 10:02am by Bill Moschler »  
 
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Bill Moschler
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Re: fingernail grind
Reply #12 - Today at 8:55am
 
New CBN 180 wheel installed. Ground 3 tools with it yesterday. They look and feel good. Have not turned with one yet but the edge does "feel" sharper than the edge from the 120 grit white wheel I was using before.  The grind looks finer. The wheel cuts with little heat.  Progress.

I am just going to grind everything with the same protrusion and the same leg angle.  I am making a chart of the exact distance of the wheel to the tool rest for each tool to aid in re-sharpening.
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« Last Edit: Today at 9:00am by Bill Moschler »  
 
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Bill Neff
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Re: fingernail grind
Reply #13 - Today at 9:32am
 
I used to hold a ruler on the gouge to measure the depth.  Easiest thing is to build a jig to get the same depth as your protrusion.  When I built my grinder stand I put in a recess that's the depth I need.  Easy to put the gouge in the Wolverine, put the gouge tip in the hole, slide the Wolvie up to the edge, tighten and go sharpen.
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