CBN wheel for the Tormek.
A CBN wheel for the Tormek. Boron Nitride is a ceramic material with almost the hardness of diamonds. Cubic Boron Nitride Grinding wheels (CBN wheels) are extremely suitable for grinding HSS and the harder "pro PM" and "2060 steel". There is hardly any force on the discs to be exerted, there is little heat development, little sparks and the grinding result is stunning! Another great advantage is that the surface of the wheel does not wear out! And no more dust happens because your grinding stone must be made flat again! For most wood-turners, a CBN wheel will last a lifetime. The wheel of 200 mm is made for the Tormek. This machine runs so slowly that balancing is not necessary. The Natslijpende Tormek is then a dry grinder. This wheel is sprinkled with a finer grain than the 15 and other 20 cm wheels and yields a result that equals the result of the Natslijpende machines. This wheel is also usable on the Tormek look-a-likes like the Scheppach and the Record Power natslijpers. This grinding wheel is supplied including the adapter (to 12 mm) to mount the wheel on the axle of the Tormek. If you want to try the CBN grinding wheels make an appointment and take your chisels with you!
Important information for use:
1-do not exert pressure on the wheel. Do not use extra pressure on the chisel that you sharpen. The weight of the chisel itself is sufficient! Too much pressure can lead to damage to the grinding wheel due to heat formation. (The granules change a bit of shape at 400 degrees Celsius, real damage only occurs at an even higher temperature. (For comparison: A diamond stone already creates damage at 170 degrees)
CBN Grinding wheels.
A few years ago a damaged copy of the producer was received after a demonstration. Due to the thought of the sound that would arise if I were to print a steel chisel on a metal grinding disc, the grinding wheel was located in the box under the Slijpbok for a few months. Once it opzat there is no more going on. (that dreaded sound was hardly there…)
What IS CBN?
CBN means Cubic Boron Nitride. They are square grains of the ceramic material Boron Nitride. A material ever developed by General Electric. In the years 50 they were already testing with it and in 1969 it was put on the market. It was revolutionary! It did last 50 times longer than diamonds! The grain was initially much more expensive than diamonds. But because the material is now produced in larger quantities (and especially in China) the price is comparable to gold. It remains expensive stuff so.
Why a CBN grinding wheel?
CBN wheels are extremely suitable for grinding HSS and the harder steels with cobalt additions. There is hardly any force on the discs to be exerted, there is little heat development, little sparks and the grinding result is stunning! Another great advantage is that the surface of the wheel * does not wear out! And no more dust happens because your grinding stone must be made flat again! * For most wood-turners, a CBN wheel will last a lifetime. These grinding wheels also have CBN on a part of the side. Very useful! What kind of grain does such a CBN wheel? The standard "grid" on a wheel is similar to about grain 150. Then there is a type with the grain "fine". This is comparable to grain 240. Finally, there is still one of the type super fine. To be compared with grain 280. This is information from the producer. If I were to gamble on the basis of the sharpening result, then I would have estimated the grain coarseness much higher. In My assortment are almost all wheels with standard grid. This gives a fantastic tightly cut crease. When I have dragged my gouge again I can never fail to shave, by way of test, some hair from my arm… The wheel with a diameter of 250 mm I have only with the fine sprinkling. This wheel is not balanced because it is made to replace the stones of a natslijper. I find the standard granule slightly too coarse.
At what speed should CBN wheels run?
The wheels are balanced, just like a wheel to your car, so that they also do not cause vibrations at higher revs. CBN Wheels perform best at the following speeds: a 150 mm wheel – rpm between 1700 and 3000 rpm. A 200 mm wheel between 1400 and 2100 rpm. In general, you can say that a CBN wheel performs better if the speed is higher up to the above-mentioned limit. The wheels with a diameter of 250 mm are, as said, made for the Tormek and other natslijpers. This machine runs so slowly that balancing is not necessary. These wheels I have therefore only in stock in the sprinkling "fine". It works very well but there is 1 little annoying thingy. When sharpening, the tip of your chisel is always a bit magnetic. Normally it is not because of the speed of the wheel that metal grit is thrown away. Here, however, the speed of the wheel is so low that if your chisel is cut, you have to pull the magnetic particles off the edge with a swab.
The CBN wheels can be obtained in 150 mm, 200 mm and 250 mm. The widths are 20 mm or 40 mm. The hole is always 32 mm. There are gradients (recording flange) available for the most common asdiktes. namely: 12 mm, 12, 7mm, 15mm, 16mm and 20 mm. There is also an auxiliary piece that allows you to mount the wheel on the axle of your lathe. Then you can choose your own speed to sharpen!
If a CBN wants to be put into use for the first time it can be very aggressive. If you have sharpened a few chisels, this will be less. Don't be afraid! It is not that the wheel wears very quickly. After the first few chisels, it keeps its sharpness very long.
Can it break down?
Yes! If you drop a wheel on a concrete floor it can break or deform it. If you exert too much pressure on the wheel, the CBN granules can deform slightly as a result of heat development, which will decrease performance. This happens only from 400 degrees. (For info: At a diamond wheel that is already from 170 degrees) If you want to try the CBN grinding wheels make an * appointment * and take your chisels with you! In my work place a 200mm CBN wheel has been running on a large grinding machine for a few years and a CBN wheel on the Tormek for a few weeks. Other applications The CBN sprinkling is also applied to law languages. This is of course the finest grain. They are in the form of a marker and in a flat plane. There is also one with a flat surface and a marker shape. The flat surface I use for the chisel (skew) The both bended sides for my large and small scales guts respectively. Well… that has become a long story and for many people maybe a bit boring, but I hope someone has something to it. If you want to work with such a CBN wheel yourself, please call or mail me. And take your chisels with you!