Answer :
Final answer:
Hand grinding of lathe tools and drills requires maintaining correct angles like the relief, rake, and side cutting edge angles, using tools like bench grinders with properly dressed wheels. Drills have a general grinding angle of approximately 118 degrees, with symmetry being crucial for effectiveness. Grindstones and jigs assist in ensuring precision.
Explanation:
Methods and Techniques to Hand Grind Lathe Tools and Drills
Hand grinding lathe tools and drills is a precision task that requires understanding the correct angles and procedures for creating sharp, effective edges for various applications. Lathe tools are generally ground to create specific geometries with angles suited for the material being machined and the type of operation, such as turning or facing.
For lathe tools, it is essential to maintain the correct relief angle, rake angle, and side cutting edge angle. The tool's tip should be ground to a sharp point with the appropriate rake angle — positive for soft materials and negative for harder materials. A bench grinder is commonly used with aluminum oxide wheels that are dressed to preserve wheel shape and cleanliness. When grinding, the tool should be held securely, moved back and forth against the wheel with smooth, consistent motions, and cooled intermittently to prevent overheating, which can lead to loss of temper and softening of the steel.
For drills, the cutting edge should be ground to an angle of approximately 118 degrees for general-purpose drilling, with variations for different materials. The chisel point should be ground to a slight angle to facilitate cutting. Symmetry is critical; an off-center tip can cause the drill to wander. Grinding jigs and fixtures can ensure consistent angles and precision.
Drills and lathe tools may require different methods, such as using a fine-grit wheel for finishing edges or trying different grinding techniques like plunge grinding for forming drill tips. With practice and patience, hand grinding tools can be mastered to produce precise and efficient cutting tools necessary for metalworking operations.
Learn more about Grinding Lathe Tools and Drills here:
https://brainly.com/question/32312934
#SPJ11
