Construction (Main Parts of Horizontal Reciprocating Table Surface Grinder)

Construction (Main Parts of Horizontal Reciprocating Table Surface Grinder) Points : Construction (Main Parts of Horizontal Reciprocating Table Surface Grinder), Base, Table, Wheel Head, Coolant System, Capacity, Wheels The major parts of the Planer type horizontal-spindle surface grinder and are briefly discussed below. 1. Base The base of the horizontal surface grinder has a column at the back for supporting the wheel-head. The saddle which supports the table is mounted on carefully machined ways at the front of the machine. 2. Table The table on most grinders is similar to the table on the milling machine. It is fitted to the saddle by carefully machined ways. It can be moved right or left traverse travel under the grinding wheel. This kind of table' is called reciprocating. The table carries adjustable reversing dogs which may be set to limit table travel. Hand table feeds can be used as well as automatic power feeds. On some machines, the table can be moved in or out from the vertical column which supports the wheel-head. This movement is known as cross feed. Slide ways. On other machines, the wheel and driving motor (wheel-head) move on cross-slide ways. 3. Wheel Head The wheel-head is mounted on the column. It moves on carefully machined way by which it can be raised or lowered. A hand wheel which turns a lead screw is used to move it up and down on the- column. A spindle for revolving the grinding wheel is mounted in the head in. a horizontal position. Hence machine is called horizontal. The heart of any precision grinding machine is the grinding wheel spindle and bearing.
Any wear in the bearings that permits the spindle to vibrate will make the machine useless for precision work. A disk wheel is mounted on the horizontal spindle. The: wheel grinds the work-piece as it feeds and reciprocates under the wheel.
An electric motor is built into the machine to furnish power’ to turn the grinding wheel. The wheel is usually driven by pulleys and belts or direct spindle drive. 4. Coolant System A coolant must be used to regulate the temperature of the work. The coolant is directed to the work by pipes from a pump and a tank. 5. Capacity Grinders are described in terms of work capacity. This is usually given as the maximum working space provided by the work-holding device, which usually is the magnetic chuck. A machine size of 152.4 mm by 457.2 mm (6 inches by 18 inches) designates the dimensions of the working area of the chuck or table. 6. Wheels The wheels used in the horizontal machine are usually plain wheels which cut on the periphery in grinding shoulders; a recessed wheel may be used. In grinding V’s and other shapes, wheels with formed edges are used.