The Wheel and the Micro-Chip

One of the first things a woodturner needs to learn is how to sharpen woodturning tools. This is different than the sharpening of most other tools in the workshop but it is neither difficult nor expensive to setup and learn.

Many woodturners come form a background of flat wood work where chisels and planes are common tools. These require frequent sharpening although not as frequently as do wood lathe tools. However, the sharpening implements used for most tools are not used for lathe tools. The razor edge left by water stones or sandpaper systems and the like will not hold up to the abuse of quickly spinning rough wood, especially if there is grit in the bark. Woodturners move to the grinder and from the grinder to the lathe.

Most workshops have a grinder used to remove nicks in plane irons or chisels and the like. This can be altered to become a woodturner’s sharpening station. First of all the wheels need to be replaced. For odd reasons of the metallurgical world harder wheels are needed for softer steels and vice versa. In terms of the workshop, this means that those grey carborundum wheels that came with the grinder need to be replaced with aluminum oxide to accommodate the high speed steel of most woodturning tools as opposed to the high carbon steel of other woodworking tools.

While a lot of space is giver over to the color and softness of the grinding wheels for high speed steel, color is added to aluminum oxide for the convenience of the manufacturer and most wheels available to the home workshop are sufficiently soft to be effective. In fact, the very expensive wheels promoted by many woodturners and woodturning suppliers are very soft which prevents overheating but wear quickly and need quick frequent replacement. Since overheating is not a problem with high speed steel, this is more an advantage for the seller than the buyer of expensive grinding wheels.

Now that aluminum oxide wheels are on the grinder with one of coarse grit around forty to fifty for shaping tools and one of fine grit around eighty to one hundred for shaping tools, it is necessary to think of holding the tools for sharpening. Usually the tables on home shop grinders are too small and not easily adjustable for good use. Replace them with either good after market tables or home made ones. An excellent idea is to use a table under the coarse wheel for heavy reshaping and a sharpening jig under the fine wheel for regular sharpening. If the grinder will still be used for other types of tools in the shop, frequent cleaning will necessary and a dresser should be used.

With these simple and inexpensive changes to the grinder, woodturners will be ready to meet the challenges of needing sharp tools. All that is needed is to enjoy the sharpening process amid the delight of turning wood.

Darrell Feltmate is a juried wood turner whose web site, Around the Woods, contains detailed information about wood turning for the novice or experienced turner as well as a collection of turnings for your viewing pleasure. You too can learn to turn wood, here is the place to start. Wondering what it looks like? There are many free videos on the site dealing with everything from sharpening to making a bowl.
For full instruction in getting your tools sharp and in particular how to make a very inexpensive sharpening jig, check out making and using the sharpening jig. Using only short time, some shop scraps and a couple of dollars you can make a jig that will perform like a hundred dollar tool and easily sharpen your wood lathe tools.

Making your own cup of coffee can sometimes be tricky. It not only depends on the coffee beans you buy, but is also largely dependent on your coffee grinder. The perfect coffee grinder is able to extract well the rich bitter flavor of coffee.

A good ใบเจียร  quality grinder makes the best tasting coffee. Coffee grinders have tons of selections, showcasing different functionalities. Choose a model that suits your preferences and needs. Check out the important features and qualities of what you will buy.

Here are a few guides to help you select the model fit for you.

A good grinder should produce a consistent ground size. There should not be any uneven extractions and mess at the cup bottom. It should grind very finely or coarsely, just like raw sugar. There should never be any burning. A good grinder creates little friction. It should not produce excessive heat that affects coffee flavors.

Coffee grinders meant for home usage are simple appliances. If you’re planning a business such as a coffee shop, commercial grinders are made with more components of metal, making them more expensive. They have large hoppers that can serve lots of customers.

In a commercial set up, one can select from either a doser or a doserless grinder. Dosers can handle volumes of coffee by allowing the beans to have batch grinding. It can hold up to 6 dosages of grounds. The need for freshly ground coffee outweighs the static problem. Dosers can result to the consumption of un-used grounds. Most coffee owners prefer a doserless grinder.

There are two types of grinders you can choose from. Blade grinders have a sharp metal blade that can chop coffee beans into grounds. It is suitable for drip coffee makers. However, it is not recommended for espresso machines.

Burr grinders, on the other hand, use a revolving grinding wheel that can produce more consistent coffee grounds. It allows even wetting and stuffing of grounds. Burr grinder is the most expensive type.

Burr grinders have two types – wheel and conical. Wheel burrs are plate-shaped, spinning very fast. The conical type retains a lower speed, for the aromatic and flavorful effect of the grounds.

Wheel burrs are best for espresso machines. Conical burrs are the ideal type for grinding oily coffees that won’t clog up. Some prefer to buy conical grinders because it is marketed for home usage, with the use of a plastic burr carrier. It is much better with a flat style that has a metal burr assembly.

The grind adjustment is important, especially for grind control. One can choose between stepped and stepless adjustment grinders. Stepless has unlimited number of settings of grind sizes. Stepped adjustment has preset stops.

A good grinder should be easy to maintain. Look for a grinder design that has a removable compartment, for easy dishwasher cleaning. A grinder should be mess-free during regular operations.

Braun is the most common brand, receiving good reviews in both categories of model grinders. Other popular and best quality brands include Burr, Solis, Krups, Capresso and Kitchenaid. In general, these popular brands have been trusted by many users and have received many positive feedbacks already. That should serve as guide for you in choosing the next model to buy.

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