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Re: Carbide wheel
my understanding is the material is actually a sintered combination of carbon and tungsten which forms tungsten-carbide particles.
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Machine tool cutters are formed by combining the particles with a softer cobalt (sometimes with nickel) matrix. The result is "cemented carbide". mike --- In 7x12minilathe@..., Leo Cormier <leocor@...> wrote:
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Re: Carbide wheel
Ray Kornele
Mildly so. Not deafening, by a long shot. Just a moderate sound of air escaping. What surprised me was, in 1980 something, it only cost about $200. But, we had to install a refrigerated air dryer to supply air. Withouit the drier, the cooler kept shooting ice bullets, from frozen condensate from the air.
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We had some machining to do that had to be cooled, but, couldn't take liquid coolant. I don't think it was a hilsch. I assume that is a brand name? KrazyKyngeKorny (Krazy, not stupid) On Tue, Oct 11, 2011 at 9:42 AM, John Brookes <haiticare2011@...> wrote:
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Re: Carbide wheel
hilsch vortex cooler. holy smokes! Was it noisy?
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John B On Oct 11, 2011, at 12:24 PM, Ray Kornele wrote:
Most carbide tools are high-temp BRAZED! I, too worked in a machine shop, |
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Re: Carbide wheel
Ray Kornele
Most carbide tools are high-temp BRAZED! I, too worked in a machine shop,
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and ordered many of the tools, including M-5 for some special jobs that could not be cooled with coolant. I, also, ordered, and, installed a vortex cooler. Keeps things cool by producing super cold air. KrazyKyngeKorny (Krazy, not stupid) On Tue, Oct 11, 2011 at 7:41 AM, Leo Cormier <leocor@...> wrote:
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Carbide wheel
Leo Cormier
¿ªÔÆÌåÓý
"The green wheels don't actually grind the carbide, they pull little pieces of carbide away & grind the binder."
What binder? Carbide is a sintered material, which means that tiny pieces of carbide (almost powder) are compressed under great force and heated until it binds together as one piece. As far as "pull little pieces of carbide away" goes, that is exactly what grinding is. I spent 12 years in vary large machine shops (in shipyards) and we always used the green wheel to rough the brazed carbide tools and the wet diamond wheel to put a polish on just the carbide part of the tool. In a pinch, you can get by without the diamond. Leo |
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Re: carbide wheel
A cheap alternative to a diamond wheel is the diamond knife sharpening blocks sold widely in places like harbor freight for 15$. They have a mix of grits, and are perfectly adequate for sharpening carbide tools. Typically you use water on them. I use it for sharpening both steel and carbide with excellent results.
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Tools have been sharpened by hand for thousands of years, and you get a better edge by hand. Its an interesting question if sharpening an insert is worth the trouble. I have a Silicon Carbide stone that Kennametal sells, but the diamond cuts much cleaner. The only time you need a diamond wheel is if you need to sharpen a lot of edge quickly, e.g., a professional knife sharpener, and there is really no reason to get it for sharpening a carbide lathe tool occasionally. I am a tool addict, so I bought a HF tool grinder and a diamond wheel from Enco. Total about $240. But since Ive got it, Ive used it maybe 5 minutes in 3 months! Another thing to consider is that a wheel produces an inferior result often. This is because hand sharpening has more control and hand-eye coordination. The wheel cuts so fast it is over in a few seconds, much too fast to control by hand. You basically shove the tool at the wheel and hope for a good result. Drills are easier on the wheel, and I have never sharpened a drill on the diamond block by hand. But it should be possible. I have no doubt a better result would happen. Recommendation: -Buy a 15$ diamond knife sharpening block from HF -get a squirt bottle for occasional water on block -optional- get a baking pan to contain the water. -Buy a fluorescent magnifying lap from HF. With a coupon, about $28. I have about 5 of them. A really good light, well-made. This will help you see the work piece edge. -optional - buy a stereo microscope from ebay. (120$). You will get spectacular results with it, because you will see the edge close up. JB On Oct 11, 2011, at 7:04 AM, john brookes wrote:
go diamond if you can. |
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Re: carbide wheel
I'm thinking of getting a green wheel for my bench grinder for carbideI vote for 60, maybe 80 but not 120. I have a 120 and it's way too slow. Do any fine tuning with a diamond lap. |
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Re: shaft and bushing for the B/C change gears
Dave
For bushings, particularly those carrying shafts that rotate at high speeds, I prefer to use Molyslip gearbox additive - straight from the can - rather than grease. This is quite a viscous fluid and seems to remain in place better than grease and a top-up spot or two, applied every year or so, penetrates easily.
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All of my power tools have had this treatment and in over 30 years I have never had any seize or noticed excessive wear. Dave. --- In 7x12minilathe@..., "mattdbartlett" <mattdbartlett@...> wrote:
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Re: carbide wheel
go diamond if you can.
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jb On Oct 10, 2011, at 4:55 PM, Jerry Durand <jdurand@...> wrote:
I'm thinking of getting a green wheel for my bench grinder for carbide |
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Re: carbide wheel
The green wheels don't actually grind the carbide, they pull little pieces of carbide away & grind the binder.
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Roy --- In 7x12minilathe@..., "GadgetBuilder" <John@...> wrote:
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Re: carbide wheel
Ray Kornele
Without the slightest doubt.
KrazyKyngeKorny (Krazy, not stupid) On Mon, Oct 10, 2011 at 5:33 PM, Jerry Durand <jdurand@...> wrote: ??????? I believe we are in agreement here...aren't we? |
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Re: carbide wheel
Jerry Durand
¿ªÔÆÌåÓýI believe we are in agreement here...aren't we?On 10/10/2011 05:23 PM, Ray Kornele wrote: Whenever you use a grinder, you should use a particle mask. Even though many kinds of dust are non-toxic, over a long period, they can lead to lung disease, including cancer. Do as you like, but, be forewarned. -- Jerry Durand, Durand Interstellar, Inc. tel: +1 408 356-3886, USA toll free: 1 866 356-3886 Skype: jerrydurand |
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Re: carbide wheel
Ray Kornele
Whenever you use a grinder, you should use a particle mask. Even though many kinds of dust are non-toxic, over a long period, they can lead to lung disease, including cancer. Do as you like, but, be forewarned.
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KrazyKyngeKorny (Krazy, not stupid) On Mon, Oct 10, 2011 at 4:45 PM, Jerry Durand <jdurand@...> wrote:
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Re: carbide wheel
Ray Kornele
Best to have two green wheels- one 60 or 80 for roughing, and, a 120 for fine finish.
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The 120 will work if you grind slow, so you don't burn the carbide. overheating carbide makes it brittle. KrazyKyngeKorny (Krazy, not stupid) On Mon, Oct 10, 2011 at 1:55 PM, Jerry Durand <jdurand@...> wrote:
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Re: carbide wheel
Jerry Durand
Pretty much any dust is toxic in some way (may "only" be a severe
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irritant) so that's always good advice. On 10/10/2011 04:43 PM, GadgetBuilder wrote:
The low cost diamond wheels are typically about 4" resin bonded, meant for cutter grinders. See Shars or CTC Tools. You could make an adapter and use a 4" wheel on your present grinder, or rig something else up. 6" diamond wheels are available on eBay but price is considerably higher. --
Jerry Durand, Durand Interstellar, Inc. www.interstellar.com tel: +1 408 356-3886, USA toll free: 1 866 356-3886 Skype: jerrydurand |
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Re: carbide wheel
The low cost diamond wheels are typically about 4" resin bonded, meant for cutter grinders. See Shars or CTC Tools. You could make an adapter and use a 4" wheel on your present grinder, or rig something else up. 6" diamond wheels are available on eBay but price is considerably higher.
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One caution in grinding carbide: the dust is toxic so take appropriate precautions. John --- In 7x12minilathe@..., Jerry Durand <jdurand@...> wrote:
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Re: 7X14 mini-lathe
¿ªÔÆÌåÓýAs
long as you're happy that's all that matters. Good to hear that the supplier was
eager to step up and take care of any problems you had.
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Re: carbide wheel
Jerry Durand
Any recommendations? My grinder takes 6" x 3/4" wheels.
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On 10/10/2011 02:33 PM, GadgetBuilder wrote:
The consensus on green wheels for carbide is that they work but cause micro cracks leading to early failure of the edge. --
Jerry Durand, Durand Interstellar, Inc. www.interstellar.com tel: +1 408 356-3886, USA toll free: 1 866 356-3886 Skype: jerrydurand |
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Re: carbide wheel
Jerry Durand
I use 80-grit belts on my sander for HSS stuff and that seems to work
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fine (I'm not trying for super polished razor edges here). Being as carbide is so hard it *seems* that the finer grit would be ok and not clog. On 10/10/2011 02:06 PM, MERTON B BAKER wrote:
Dunno, myself, I just bought the ones HF sells with its tool grinder, and --
Jerry Durand, Durand Interstellar, Inc. www.interstellar.com tel: +1 408 356-3886, USA toll free: 1 866 356-3886 Skype: jerrydurand |
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Re: carbide wheel
The consensus on green wheels for carbide is that they work but cause micro cracks leading to early failure of the edge.
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Better to use diamond -- diamond wheels are reasonably priced now and should last a long while in a home shop. John --- In 7x12minilathe@..., Jerry Durand <jdurand@...> wrote:
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