what is manual cylindrical grinding machine and its accessories and how it is different from mechanical cylindrical grinding machines

 A manual cylindrical grinding machine is a machine tool used for grinding cylindrical workpieces manually. The workpiece is rotated between centers or held in a chuck and the grinding wheel is moved back and forth over the surface to remove material and achieve the desired shape and size. 

Picture :- Pentagon Manual Cylindrical Grinding Machine

Accessories for manual cylindrical grinding machines may include:

1. Grinding wheel - the abrasive tool used to grind the workpiece. Different kinds of grinding wheels are available for various materials and applications.

2. Centers- the workpiece is typically held between centers, which are pointed metal cones that fit into the ends of the workpiece.

3. Chuck - an alternative to centers is a chuck, which is a device that holds the workpiece rigidly in place.

4. Dressing tool - used to shape and true the grinding wheel.

5. Workpiece support - a support bar or rest that helps hold the workpiece in place during grinding.

6. Coolant system - to prevent overheating and reduce friction, a coolant system can be used to provide a steady stream of coolant during the grinding process. 

7. Workholding devices - various devices can be used to hold the workpiece securely including magnetic chucks, collets, and fixtures.

The main difference between manual and mechanical cylindrical grinding machines is the method of operation. 

Manual cylindrical grinding machines are operated by hand, with the operator controlling the movements of the grinding wheel and workpiece using a handle or lever. These machines require skilled operators who are proficient in maintaining precise control over the grinding process. 

On the other hand, mechanical cylindrical grinding machines are automated and operate using a computer program. The grinding wheel and workpiece are controlled by a motorized mechanism, which allows for precise and repeatable grinding. These machines are generally faster and require less operator skill, but may be less flexible than manual machines. 

Overall, the choice between a manual and mechanical cylindrical grinding machine depends on the application and the level of precision required. For small-volume production or one-off jobs, a manual machine may be sufficient, while for high-volume production or precision work, a mechanical machine may be more suitable.