# How to calculate the speed of the grinding wheel of a vertical double surface grinder?

Grinding a workpiece is a common machining operation and is performed when very tight tolerances and surface finishes are required. Operators of vertical surface grinders must be familiar with the machine tool itself, as well as how to select and use grinding wheels, workpiece fixtures, and coolant in order to successfully perform grinding operations. This article will mainly introduce how to calculate the speed of the grinding wheel of a vertical double surface grinder.

Vertical surface grinder machine tools are usually designed for grinding processes and require appropriately manufactured grinding wheels. On the other hand, when the lower grinding wheel is used for surface grinding of various types of high-alloy and high-strength workpieces, very low grinding wheel speeds, about 3,000 to 4,000 fpm, are required as a means to minimize heat generation. In addition, there are certain types of materials and workpieces that are particularly sensitive to heat. The speed of the grinding wheel depends on the type of grinding operation, such as external or internal grinding or cutting operations. The working speed depends on the type of work, the type of grinding and the desired finish. For higher working speeds, it is recommended to use harder grinding wheels and vice versa.

To calculate the rotational speed of the grinding wheel of a vertical surface grinder, it is necessary to consider that the circumferential wheel traversed by the circumference of the wheel on the abrasive particles was once a round of the wheel. So their speed is equal to the circumference (in feet) multiplied by the revolutions per minute (RPM).

In addition, do you know what RPM represents in the rotational speed of the grinding wheel of a vertical end face grinder? RPM = revolutions per minute; defined as the complete shaft speed per minute. SFPM = surface feet per minute; defined as the distance of any kind of abrasive particles moving on the cutting surface per minute. The speed of the grinding wheel is usually given in SFPM, and the machine speed is usually expressed in RPM.

Moreover, how fast does the grinding wheel spin? The grinding wheel speed should be maintained in the range of 5000 to 6500 feet per minute (1525 to 1980 meters per millimeter), unless there are special conditions or the use of equipment and grinding wheels specifically designed to significantly increase the speed of the grinding wheel.

How to calculate surface velocity from RPM? Multiply the angle of the processed object by the peripheral speed to measure the rotational speed. For example, if it rotates at 400 rpm: 87.98×400=35,192. This is the surface speed of the object, measured in inches per minute. Divide this answer by 63,360, the number of inches in one mile: 35,192÷63,360=0.555.

Do not over speed the grinding wheel. It is necessary to compare the speed of the vertical surface grinder with the speed marked on the grinding wheel or packaging to ensure that the speed of the machine is equal to or lower than the maximum working speed of the grinding wheel. The risk of exceeding this level is not only wheel damage, but also the safety of workshop personnel.

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