SSD in abrasive machining

a$.$ refers to micro cracks in ductile workpieces.

b$.$ refers to dislocation in brittle workpieces.

c$.$ is pore and impurity.

d$.$ mainly refers to micro cracks in brittle workpieces.

Use system approach and use tribology terms and methods to deal with abrasive

machining processes are due to

a$.$ challenges of elastic and plastic deformation in high precision.

b$.$ challenges of micro cutting of HSS abrasive cutter.

c$.$ challenges of multiple cutting edges of elastic and plastic high precision

diamond grains.

d$.$ challenges of elastic and plastic deformation, micro cutting, and multiple

cutting edges of abrasive grains.

Ductile mode machining

a$.$ is possible for brittle materials if depth of cut is extremely small.

b$.$ is possible for brittle materials if depth of cut is extremely large and ductile.

c$.$ is possible for brittle materials if material is controlled at high precision.

d$.$ is possible for brittle materials if form error is controlled at high precision.

Abrasive machining

a$.$ has one cutting edge of high precision.

b$.$ is the same or similar to diamond turning for nano precision machining.

c$.$ has many cutting edges due to many cutting grains.

d$.$ has one cutting edge due to number of cutting grains being limited to one.

Truing

a$.$ is the same as dressing.

b$.$ is to get true shape of micro cutter to produce precision parts.

c$.$ is to get correct profile of tool and concentricity of profile to rotational axis.

d$.$ is to get sharpness of abrasive grains for effective machining.

Uncut chip thickness model

a$.$ shows tool is infinitely soft and workpiece is infinitely hard.

b$.$ indicates we have in total $5$ possible ways to improve abrasive machining's

precision.

c$.$ depends on contact length to achieve high precision.

d$.$ shows a small uncut chip aspect ratio of abrasive ductile elastic grain of

precision. Best $/$ most suitable choice:

Uncut chip aspect ratio $l\frac{g}{?}$ hcumax in surface grinding

a$.$ is typically ${10}^2.$

b$.$ is typically ${10}^{-2}.$

c$.$ is typically ${10}^3.$

d$.$ is typically ${10}^{-3}.$

Centerless grinding means

a$.$ cylindrical workpiece being machined has no center.

b$.$ cylindrical tool being used has no center.

c$.$ cylindrical workpiece being machined is not supported through center.

d$.$ cylindrical tool being used is not supported through center.

Abrasive machining

a$.$ typically has a big normal cutting force as workpiece material is brittle.

b$.$ typically has a big normal cutting force as tool material is brittle.

c$.$ typically has a small normal cutting force as workpiece material is brittle.

d$.$ typically has a small normal cutting force as tool material is brittle.

Contact length

a$.$ will be smaller when contact force induced workpiece deformation grows.

b$.$ will be smaller when contact force induced tool deformation grows.

c$.$ will be bigger when contact force induced tool deformation grows.

d$.$ will be bigger when contact force induced workpiece deformation grows.

Workpiece surface precision

a$.$ becomes better when workpiece speed is increased.

b$.$ becomes better when tool speed is decreased.

c$.$ becomes worse when depth of cut is increased.

d$.$ becomes worse when depth of cut is decreased.

A tool of mesh count $C=400$

a$.$ will lead to better workpiece surface finish than a tool of mesh count $C=800.$

b$.$ will lead to worse workpiece surface finish than a tool of mesh count $C=800.$

c$.$ will lead to better tool surface finish than a workpiece of mesh count $C=800.$

d$.$ will lead to worse tool surface finish than a workpiece of mesh count $C=800$Best $/$ most suitable choice:

Precision abrasive machining

a$.$ is the same as polishing.

b$.$ deals with form and roughness.

c$.$ deals with size precision only.

d$.$ deals with all features of precision.

Form accuracy is

a$.$ a high precision feature of spatial frequency.

b$.$ about the accuracy of a geometric form.

c$.$ a medium spatial frequency quantity for precision control.

d$.$ a high spatial frequency quantity for quality control.