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Questions and Answers
What is the main purpose of a surface grinding machine?
What is the main purpose of a surface grinding machine?
- To finish internal surfaces
- To finish flat surfaces (correct)
- To finish external cylindrical surfaces
- To finish tapered surfaces
Which type of grinder is used to finish external cylindrical surfaces with straight, tapered, steps, or profiles?
Which type of grinder is used to finish external cylindrical surfaces with straight, tapered, steps, or profiles?
- Plain centre type cylindrical grinder
- Universal cylindrical surface grinder
- Form cylindrical grinder
- All of the above (correct)
What is the main difference between a plain centre type cylindrical grinder and a universal cylindrical surface grinder?
What is the main difference between a plain centre type cylindrical grinder and a universal cylindrical surface grinder?
- The orientation of the grinding wheel
- The type of grinding wheel used
- The movement of the table (correct)
- The type of surface finish obtained
Which type of internal grinder is used for thread grinding?
Which type of internal grinder is used for thread grinding?
What is the purpose of a horizontal spindle and reciprocating table in a grinding machine?
What is the purpose of a horizontal spindle and reciprocating table in a grinding machine?
What is the main advantage of a universal cylindrical surface grinder?
What is the main advantage of a universal cylindrical surface grinder?
Which type of grinder is similar to plain milling?
Which type of grinder is similar to plain milling?
What is the main difference between a form cylindrical grinder and a universal cylindrical surface grinder?
What is the main difference between a form cylindrical grinder and a universal cylindrical surface grinder?
Which type of internal grinder is used for grinding internal surfaces without using a centre?
Which type of internal grinder is used for grinding internal surfaces without using a centre?
What is the main purpose of a cylindrical grinding machine?
What is the main purpose of a cylindrical grinding machine?
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Study Notes
Grinding Wheel Operations
- Truing of a grinding wheel is an operation of bringing back the original shape of the grinding wheel using a diamond-tipped tool, and it should be done often.
- Dressing of a grinding wheel is an operation of removing glazing and loading from a grinding wheel using a tool called dresser.
Grinding Process Parameters
- Conventional grinding: Vc (20-30 m/s), Vw (1-30 m/min), Depth of cut (0.01-0.5 mm)
- Creep feed grinding: Vc (60-80 m/s), Vw (0.05-0.5 m/min), Depth of cut (0.1-30 mm)
- High efficiency deep grinding (HEDG): Vc (>80 m/s), Vw (0.5-10 m/min), Depth of cut (0.1-30 mm)
Specification of Wheels
- Geometrical specifications
- Compositional specifications
Compositional Specifications of Conventional Wheels
- Abrasive: Al2O3 (for soft and ductile material), C-Carbide (SiC)/CBN (for hard and brittle material), D-Diamond
- Grain/Mesh/Grit size: 10-30 (coarse), 30-80 (medium), 80-200 (fine), 200-600 (very fine)
- Grade or hardness of wheel: A-H (soft), I-P (medium), Q-Z (hard)
- Bonding: Vitrified, Resinoid, BF-Resinoid reinforced
- Structure: Gap between grains (0-7 dense, 8-16 open)
Compositional Specifications of Super Abrasive Wheels
- Manufacturer's material identifier: B for cBN, D for Diamond
- Grit: Varies
- Hardness: Varies
- Concentration: 25% volume occupied by diamond, 24% volume occupied by cBN
- Bond type: Varies
Internal Grinding Machines
- Chucking type internal grinder: used for grinding internal surfaces of cylindrical parts
- Planetary internal grinder: used where the workpiece is of irregular shape or heavy and cannot be rotated conveniently
- Centreless internal grinder: used for grinding cylindrical and tapered holes in cylindrical parts
Grinding Machines
- Surface grinding machine: used to finish flat surfaces
- Cylindrical grinding machine: used to finish external cylindrical surfaces
- Form cylindrical grinder: used to finish external cylindrical surfaces with steps or profiles
- Universal cylindrical surface grinder: used to finish external cylindrical surfaces
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