Grinding & Abrasive Techniques

Question 1

Bonding Material Properties

Answer 1

• must withstand centrifugal forces and high temperatures

- must resist shattering during shock loading of wheel

Question 2

what is dressing the wheel

Answer 2

resharpening the wheel by rotating the disc/abrasive stick/griding wheel against the wheel being dressed as it rotates as this removes chips clogged in the wheel and breaks off dulled grits to expose new sharp grains

Question 3

what is truing the wheel

Answer 3

using a diamond pointed tool fed slowly and precisely across the wheel as it rotates. Only a small depth. This then sharpens the wheel and also restores the disc’s true shape and insures straightness across the outside perimeter.

Question 4

occring damages during sharpening process

Answer 4

• surface burns/cracks

- residual stresses in work surface

Question 5

how to avoid damages during sharpening

Answer 5

• decrease depth of cut
• reduce wheel speed
• increase work speed
• use a grinding fluid
• reduce density of wheel structure

Question 6

general grinding rules

Answer 6

• use a large grit size and more open-wheel structure to maximize material removal rate
• use small grit size and dense wheel structure, higher wheel speeds, lower work speeds, and smaller depths of cut to optimize surface finish
• for soft metals use large grit size and harder wheel grade
• for hard metals, use smaller grit size and softer grade wheel