Grinding turning steel - how does it work?

Turning steels are made of very hard and high quality material. But after a while, they too become dull and have to be reground. How to do that and what to look for is explained in detail in this article.

Unloved work

Just who is new when turning, is often a bit afraid, nachzuschleifen the turning steels themselves. The fear is unfounded, with some care, turning steels can usually grind pretty well. However, you need the right equipment and should always pay attention to some basic things.


bench grinder

The most important thing for grinding turning steels is, of course, the grinding block. Here the most important criterion is a really round running disc in the appropriate grain, which can also deliver high numbers of revolutions (for grinding of turning steels from HSS). Silicon carbide should also be included. Grit 60 is ideal for the disc.

The disc itself should be treated regularly with a whetstone. As a result, it remains evenly sharp and is kept even with each treatment with the whetstone.

The trestle should always be firmly bolted to a firm surface. A wandering trestle is a serious security risk and also affects the quality of the work considerably.

Personal protective equipment

Working without eye protection (goggles) are grossly negligent! Never use safety goggles when grinding turning steels!

Tips for execution

Regular cooling

Always cool the rotating steel with water and make sure you always have water in reach in a suitable container.

Always press steel firmly

Do not be too hesitant when sanding. Press the steel firmly onto the pane without it hopping and fluttering. This is the only way you can grind properly, otherwise the surface will be uneven. Discolouration on the steel are irrelevant, they do not weaken the tool.

Accurate angle

The angle between the two cutting surfaces must always be less than 90°. This means that you also have to grind accordingly. Always concentrate on keeping the required angles exactly. If you make mistakes here, the tool will flutter later and make noises, making it very difficult to work with the turning tool. If the angle is greater than 90°, you can not reach the corners properly with the tool.

Sand first on the side of the point, then on the side of the heel first.

Tips & Tricks

Of course, the type of sanding always changes slightly, depending on whether it is an internal or external turning steel, and whether it is clockwise or counterclockwise. The basic rules always remain the same.

Video Board: Grinding HSS Tools