No matter which grinding machine you use the most difficult part in sharpening woodturning tools is to exactly replicate the shape and the edge angle. Now we offer the Bench Grinder Mounting Set BGM-100 which makes the patented Tormek woodturning system also available for bench grinders.
Why would Tormek, the pioneer in water cooled sharpening, introduce their jigs also for bench grinders?
We believe that the water cooled Tormek machine is superior in sharpening virtually every edge tool in your shop. However, there is no secret that when it comes to woodturning tools the initial shaping can be done faster on a bench grinder. We know that some woodturners dedicated to Tormek also have access to a bench grinder and use it for the first rough shaping. It is difficult to control by hand and it is easy to remove more steel than necessary. Now you can use the same precise Tormek jigs through the whole sharpening process. There is no longer trial and error in getting the right shape on the bench grinder. You can benefit from the fast steel removal on the bench grinder and also get the finest surface on the Tormek water cooled grindstone and the leather honing wheel – all in one jig system.
If you do not yet have a Tormek machine you can still benefit from the precise Tormek jig system on your bench grinder and easily get the desired shape and edge angle. Since the Tormek system controls these factors, the tools will behave in exactly the same predictable way all the time at the lathe. The principle for setting the shape and edge angle is the same regardless of which machine you use. If you later choose to add a Tormek to your shop, you will already have the jigs you need for your turning tools.
Bench Grinder Mounting Set BGM-100
The package includes a Universal Support, a Horizontal Base, a height adjustable block, hardware, feet for the base you will build and comprehensive instructions.
Mount the set on either side of the grinder, or buy two sets and mount on both sides and you get a versatile sharpening system.
Which jigs can I use on a bench grinder?
With the BGM-100 you can use all Tormek woodturning jigs on your bench grinder; the Gouge Jig SVD-185, the Multi Jig SVS-50 and the Tool Rest SVD-110.
About Bench Grinders
Using the right type of grinding wheel
Not all grinding wheels are suitable for the precision sharpening of edge tools. The standard wheels mounted on the grinder are often too hard and become glazed easily and clogged, which reduces steel removal and causes overheating of the tool. Worn grains must wear away so that new ones come into play. If not the grains will rub instead of cutting, which will increase the friction and heat development. Use an aluminium oxide wheel with the right binding – not too hard to avoid glazing and not too soft to avoid grooves.
The wheel surface must be kept fresh and clean. Use a diamond wheel dresser to maintain the surface in a good shape and condition.
Influence of heat on HSS steel
HSS steel can stand a much higher temperature than carbon steel without decreasing the hardness. However, at the very tip of the edge, which is very thin, the temperature can easily rise to a level which will affect the hardness. Therefore grind cautiously at the tip of the edge and do not allow it to become blue. Overheating HSS steel can cause a decrease in the hardness by as much as 4 HRC, which shortens the life of the edge. If you cool it in water, do not cool abruptly from a high temperature, since this can cause micro cracks invisible to the naked eye.
The fine dust from the grinding wheel and steel particles from the tool can be a health hazard. It is best to use a dust extraction system, so the dust does not pollute the air. You must use a separate extraction system and not the same system as for your wood dust, since a spark could light a fire in the inflammable fine dust.