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13th August 2013, 04:57 PM #16Hewer of wood
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Good result Colin.
As an aside, I can't see why a slow speed grinder is necessary.
If you can turn spindles at speed (and this is part of the game we learn) you can grind metal at high speed.
With HSS you can get to dull blue/grey at the edge without trashing the tool temper.
You do have to be assiduous at cleaning and truing AlOx wheels regardless of speed or tool steel. I've posted some of my experience with that here: Cleaning and truing bench grinder wheels » Ern's websiteCheers, Ern
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13th August 2013 04:57 PM # ADSGoogle Adsense Advertisement
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13th August 2013, 05:32 PM #17Deceased
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13th August 2013, 06:07 PM #18Hewer of wood
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In the realm of AlOx wheel innovation, IME the Norton SG (or 3x) wheels are great all-rounders. Here in Aus they're 3-4x more expensive than white, pink or ruby but well worth it in terms of slow rate of glazing and keeping true. Only come in #46 and #80 though.
See Jim Davey Planes & Sharpening - eShop - Sales - Abrasives & GrindingCheers, Ern
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14th August 2013, 04:41 PM #19Senior Member
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CBN wheels are like variable speed lathes. Once you have one, you will never go back. Just way too many advantages. Perhaps the only down side is the price, which is more than standard wheels, but they are worth every penny and a far better value. I am a platform sharpener. I blame Allan and Stuart Batty for starting me on that. For production turning, if you think of all the times you put a gouge in a jig, then take it out, and compare that to just putting it on a platform, it is a huge time savings. Any one who has basic turning skills has all the necessary skills for platform sharpening. Anchor the tool on the tool rest, rub the bevel, and cut. Like Yogi Berra said, 'it is 90% mental, and 10% in your head'.
robo hippy
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14th August 2013, 05:32 PM #20Hewer of wood
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New-material wheels have been hashed over in this forum extensively.
Peeps I respect, as I do you Reed, speak well of the CBN. Already having a diamond resin bond wheel I'm not ready to make the change but maybe in time.
I gather CBN is optimal for HSS inc. high vanadium varieties.
The price of the Norton 3X wheels in relation to diamond and CBN still make them worth investigating IMO for those on limited budgets but who want something more versatile and easier to live with than white, pink or ruby AlOx wheels. The slow rate of wear attests to the makers' claims and they more importantly work well with high carbon tools which is important when you pick up shaggy dog bench chisels or plane blades that need tough love.Cheers, Ern
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14th August 2013, 10:55 PM #21
The best recent article on Grinding Wheels that I have read was written by Bill Neddow; sadly passed away now.
Only quibble I had was his comment that "on metals with a ferrous content the diamond literally disappears". I know that is the advice given by the abrasives industry, but having both CBN and diamond wheels I can't say that has been my experience.
But, if I had neither, I would probably start with a CBN wheel, which are now cost competitive with diamond. That is only a recent development. One advantage of diamond is that it also does tungsten, if that is a consideration.
And, if I had a good new alox wheel that came with a new grinder I would probably also use that up for a while before parting with the extra dollars for either a CBN or diamond wheel. Call me McNeil...Stay sharp and stay safe!
Neil
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18th August 2013, 11:52 AM #22Novice
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- Feb 2013
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- USA
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- 10
I use dry grinding with aloxide for shaping tools, I have a 7inch high speed Baldor, and a Tormek T7 for sharpening. Both have the tool rest that Tormek sels. The first works great if you have a soft touch and you need it only once, the second is marvelous for the final sharpening and takes not more that 20 seconds of work. This sistems is excellent in my opinion for all type of steels and also for shaping soft metals.
Regards.
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