The vertical grinder is one of the best power tools for use in woodturning. These are also known as disc grinders and come in a variety of sizes, shapes, and designs. A vertical grinding spindle is used for turning small pieces of wood or plastic and is ideal for all around work. They can do a very good job of polishing as well.
The main advantage to using a vertical grinder over a circular one is that the disc will stay on plane. This means that the distance between centers of the chuck will be the same throughout the turn. This makes the workpiece directly opposite the grinder less severe and allows for a more accurate diameter. With a rotating tool there is an inconsistency with the distance, the chuck will stay on the plane and the workpiece will not always be exactly centered. In some cases this can cause greater problems because there is not as much room to play with and work within the dimensions.
In recent years, there have been a number of changes made to both the design and the construction of the vertical grinder. The most common is the introduction of a two-piece housing that contains a chuck that can be locked into place. These new units have a greater degree of accuracy than the original versions, but they still need to be manually turned to ensure the smoothest and most accurate results possible. There are also a number of different types of housing including flat top, round nose, and flat nose, among others.
One of the other major changes made to these vertical grinders is to the grinding wheels used. Flat top wheels were originally designed for material removal applications but they are now used for many other applications as well. A significant advantage of the flat top units is that they are lighter and are less bulky than the round nose wheels. Some of the materials that they can be used to include laminates, aluminum, copper, brass, and stainless steel. Another advantage of the flat top units is that they often have more teeth than the round nose units and they are able to handle greater torque levels.
Many people are also concerned about the level of clamping force that is used when using the vertical grinder. Grinding wheels are not held in place by any means and there is a potential for excessive force to be used during the grinding process if the wheels are clamped improperly. This leads to an increase in the level of distortion caused by imperfections in the material as well as from a decrease in the angularity of the finished surface. However, the improvement in clamping force is offset by the decreased level of accuracy with which the final product will be completed. Since the new design includes a more efficient clamping system, the level of distortion should be lessened overall and the accuracy of the finished surface should be greater.
Some of the other issues that are commonly associated with the use of the vertical grinder wheels relate to material removal and reduction of surface irregularities. There are generally two types of material removal that can occur when grinding wheels are used; either radial action or directed action. The former occurs when the top surface of the grinding wheel moves past the base material causing it to scrape back or push material out of the material. The latter involves the grinding wheels pushing material into the material at an angle which causes the material to be lifted off the grinding plate.