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Different grinders of the Dremel. What to use? Answered

I use a dremel-clone. It has a set of grinders of three colors: blue, red-orange, and pink, the three in the same set.

I can't see differences in hardness, but it must be differents, so...

Can you help me in what color use in which task?

Thank for your time!

Discussions

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infob
infob

8 years ago

I'm sorry about not google-search the grinders.
I did not do it because I have no names for the materials... but I could see the colors in a graphical search. Sorry.

It looks like green/grey/blue has the most hardness, and pink is the finest.
Orange looks the all-terrain one, good for steel, but not suitable for aluminum.

Thanks to all.

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canucksgirl
canucksgirl

Best Answer 8 years ago

It looks like the pieces have different grit. The darkest one looks like a rougher grit, where the orange might be a medium grit and the pink looks like a finer grit.

I would google the brand name you're using, and look at the company's website for replacement parts, they should tell you (based on color etc), what the difference is.

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paul.orozco88
paul.orozco88

6 weeks ago

Those are grinding stones! They come in many different shapes and sizes. Color determines grit. The darker the color, the coarser the grit. The most coarse being darkest charcoal grey, up to a whitish for fine grit. Coarse will grind fast, or help edge your tool/workpiece quickly, the colors refine that further, and the white/fine is used for honing/polishing, and is usually accompanied by a green paste called polishing compound.
Use a spray bottle with water to cool your metals while grinding, to not overheat them.
Coarse grit stones are very soft and will change shape quickly, while fine grits are very hard and dense.
Manufacturers may differ slightly, but my best guess is that your stones are coarse(blue), medium(red-orange), medium-fine/fine. Here’s a pic of a few of mine, for reference.

C57039E3-A867-44A6-B09E-24CE13BC8BE4.jpeg
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capitancobre
capitancobre

6 weeks ago

Try not to use grinding stone for soft metal like aluminum or copper. It gets stuck in the abrasive and is very hard to get off the tool.

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kack85
kack85

2 months ago

From georgiagrinding..

The specification

Contrary to what you may think, the long codes associated with grinding wheels actually can be interpreted and generally have a clear meaning. Most all manufacturers will list the grit type, grit size, wheel hardness, structure and the bond in every grinding wheel produced. It is important to note that there is NO STANDARD among grinding wheel manufacturers. Each will use their own unique identifying method of marking; However, there are some common rules - at least here in the USA. A typical grinding wheel specification might be 'A60-I10-VS'. 'A' is the grit type (in this case aluminum oxide), '60' is the grit size, 'I' is the relative hardness, '10' is the structure, and 'VS' is the type bond (VS for this company means vitrified bond. There are variations too. For example, one might see this '97C80 +F/-G -B11-DC'. In this case, 97C is the grain/grit type (here 'C' probably is silicon carbide), 80 is the grit size, +F/-G indicates a zoned or graded wheel of an in-between hardness. -B11 is the bond (B11 is probably a resin bond). The DC is some process done to the wheel such as slots or grooves or holes or induced porosity. Other suffixes are added by each individual manufacturer for special conditions. Only by looking at the manufacturing record or process sheet will anyone know for certain what exactly made up that particular grinding wheel - The specification alone will not tell the whole story.

As noted above, generally one cannot take a grinding wheel from one manufacturer that is marked similarly and substitute for another manufacturer's grinding wheel of equal marking. In the first place, it is highly likely they will not be marked similarly and secondly, variations in factory production methods typically make grinding wheels of different construction. Unless one is not very picky about their grinding wheel or not doing exacting work and is willing to accept some grief, we would not recommend anyone try to make substitutions without some guidance from an engineer familiar with the process and the manufacturers. This is where we come in: We work with the factories to get you the proper grinding wheel. It is also important to note that the end user should expect some TRIAL & ERROR when converting from one brand of wheel to another. Sometimes a manufacturer may need two or even three tries to finally hit on the exact hardness, grit, bond, etc.. Patience and time are key to any successful conversion and testing.

Grit type and color

Grit type is generally either aluminum oxide (white, pink, ruby red, brown, grey, etc.) silicon carbide (black or green), ceramic (blue and pink) or any combination of these. Aluminum oxide is by far the most popular. It is available in the following colors: White, pink, red, ruby red, brown, and grey. Each color has it's own grinding characteristics. Grey and brown grit are the workhorse grits used in bench grinding and production grinding. Tough and inexpensive they are the most 'general purpose' grit found. Can be used on low to high carbon steels. The pink and white grits are typically used on your harder steels which need a cool, friable cutting action to avoid burns. The ruby red grit is a special tough grit also used on tool steels. These grits are a little bit more expensive than the grey/brown. Ruby red is very expensive. Silicon Carbide grits are commonly either black or green. Black silicon carbide is used to grind non-ferrous metals such as aluminum and brass and also on plastics, rubber, and stone products such as marble and granite. Black silicon carbide is a very sharp grit. Green silicon carbide is an even sharper grit than black and is used primarily for carbides, titanium and plasma sprayed materials. One interesting characteristic of silicon carbides is the effect they have on steels. Due to the sharpness of these grits, one would think that they would be too aggressive and not provide a good finish. In fact, on steels, silicon carbide is used as a sort of polishing/finishing grit. It is used in tumbling processes as a surface finishing product. Also, manufacturers will often blend a small percentage of silicon carbide in with aluminum oxide grit in grinding wheels and honing stones to achieve a better workpiece surface finish on steels. The grit will actually dull and provide a rubbing action on steels which produces a better surface finish.

A newer grit that is available is ceramic (also referred to as SolGel® or SG®). Ceramic grit has the characteristic of not dulling -- It will break down or fracture into sharp corners rather than dull and pull out of the bond. This makes the wheel typically last longer and it will also provide excellent aggressive stock removal without heat build up. This grit is only made by a couple of producers and is very expensive, typically two or three times as expensive as aluminum oxide. You will normally not see a 100% ceramic grit wheel. The grit is typically mixed with aluminum oxide in various percentages from 10% up to 50%. Ceramic is used in tool steels and lower carbon steels equally well. These grinding wheels typically require a good bit of custom engineering for your specific application and process to achieve profitable results.

Grit types are sometimes mixed in combination for achieving certain cutting characteristics. Grits are also called friable (white) or semi-friable (pink, brown and grey, red, etc.). Friable grit breaks down more easily and is useful for cutting harder materials.

1
jeasterl
jeasterl

7 years ago

pink and orange is aluminum oxide used for cutting and shaping hard metals: iron, steel tool steel ect
the other green or bluish green is silicone carbide i think, used for stone glass and sometimes softer metals like aluminum or soft brass and copper

seems silly but aluminum oxide is the same material as rubies one of the hardest natural materials
watch your speeds and materials ( neither will sharpen tungsten carbide you need diamond for that)

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knife141
knife141

8 years ago

If this is a clone, a google search probably wont be much help, and if the stones are a Chinese import, the colors may not mean anything. Just pick the grinding stone that matches the size you need, and be sure to wear eye protection.

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infob
infob

Answer 8 years ago

Very good observation about chinese import colors. The color may be a missdirection to simulate variety. Thanks.

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katala
katala

Answer 7 years ago

Yes. If its not a Dremel or a similar brand, you can't be sure what it does.

I'd take a piece of scrap metal and try it out. Then you know for sure what it does, and don't take the colors to mean anything until proven.

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steveastrouk
steveastrouk

8 years ago

The green one is "Green grit" which is a special kind of abrasive for tungsten carbide. The pink is a common grit for steel tool sharpening.