Do I need a new grinder or a new bowl gouge? - Woodworking Talk - Woodworkers Forum
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post #1 of 10 Old 08-21-2017, 11:54 PM Thread Starter
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Do I need a new grinder or a new bowl gouge?

I just bought an hurricane 1/2" bowl gouge from Amazon it had 4.5 stars. I also bought the wolverine one way sharpening system with the vari grind attachment. When trying to sharpen my bowl gouge on my 6" skil bench grinder with an 80 grit stone it immediately blued the gouge. I was very frustrated and I tried using water and motor oil to keep the gouge from blueing but neither worked. So then I said screw it I will grind the gouge at a 90 degree angle past the blue part and then re-grind the correct angle but when grinding it at even a 90 degree angle the gouge is smoking and just continues to blue. Therefore I cant just start over with it. The gouge was about $33 and I don't have a lot of money right now to be buying new gouges and grinders. The grinder I have is not a slow speed grinder. I was going to try a finer grit but I can not find grinder wheels in the stores near me. I use a craftsman 1" belt sander for my other turning tools as it has an adjustable platform. But I cant use the wolverine system with the belt sander

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Adam
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post #2 of 10 Old 08-22-2017, 04:29 AM
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The stone is likely the problem. Assuming you aren't completely ham-fisting the gouge into the grinder, its likely the wheel has glazed over with particles from previously ground materials, so its rubbing more than grinding. A new stone would work but is overkill, all you really need is to dress the wheel:
http://www.homedepot.com/p/POWERTEC-...-Dresser-71003

Oh, and good news, if your gouge is a newer one made with high speed steel, you can't really overheat the edge. Those kinds of steels are made to stay hard up to red-hot heats. Now, you don't want to intentionally overheat the edge of course, but you aren't completely boned the way you are with carbon steels

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post #3 of 10 Old 08-22-2017, 04:17 PM Thread Starter
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I actually just bought a brand new I believe 80 grit wheel after the 60 grit wheel that came with my grinder chewed up my gouge. unless the brand new wheel needs to be dressed I can't see that being the problem. I am assuming the gouge is HSS I didn't actually check when I bought it because i assumed they were all HSS now a days. I am touching the gouge to the stone as lightly as I can but it still heats up to much. After being on the grinder it does leave a fairly sharp edge but the edge is a mess with knicks in it and its not straight. I also have to re-sharpen it every couple minutes because it wont hold the edge for to long.
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post #4 of 10 Old 08-22-2017, 08:06 PM
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Is your new wheel an aluminum oxide (white) or the older gray type.
The gray type will burn the metal much much quicker.
I have several Hurricane bowl gouges and have never had a problem. I do have 6" wheels and do not have slow speed.
If you do have the white wheel I would call Woodturning and see what they suggest.
http://www.thewoodturningstore.com/w...s/bowl-gouges/
It may not be likely but possible that you got one that was not hardened?

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post #5 of 10 Old 08-22-2017, 09:28 PM Thread Starter
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The wheel I have is in fact an aluminum oxide wheel.
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post #6 of 10 Old 08-22-2017, 09:55 PM
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I had the same problem when I first started sharpening gouges. A finer grit wheel will make the problem worse because it's generating more heat since it's not removing metal as quickly. I think you're going to have to have a really light touch with a small wheel at high speed. Before I got a bigger slow speed grinder, I used a bucket of ice water to chill the gouge before I started grinding and would only grind for a couple of seconds before putting it back in the ice water.
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post #7 of 10 Old 08-23-2017, 03:35 PM
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for a while I used a wen electric wet stone. The stone turned in a pool of water and the edge was almost too fine. It is meant for wood chisels and plane blades. But it works good for some other cutting edges. I sharpen skew chisels by hand with an oil stone. I am just about to try my wolverine for a fingernail grind with my grinding wheel. fingers crossed and dreading a similar problem.
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post #8 of 10 Old 09-14-2017, 03:51 PM
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Unless your grinder has a Slow Speed option, most grinders spin at 3200 RPM. WAY to fast. You want a roughly half that speed. A two speed grinder where at slow is around 1750 RPM. Regardless!!! you want a container of water nearby so you can cool the tool.

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post #9 of 10 Old 09-14-2017, 07:30 PM
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You didn't say what RPM the grinder turns. 3450 is too high unless you use a very,very light touch. I have one but spent $$$ on a Rikon low speed grinder and Wolverine Grinding Jig. It's two steps from the lathe.
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post #10 of 10 Old 09-14-2017, 10:41 PM
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I got an older grinder, craftman brand.. 6 inch dia wheels. I would like to know what brand of grinding stone and in what grit to use to touching up the turning tools? I am looking at 80 grit Norton brand.. a
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