1. machined surfaces
2. unfinished surfaces
3. loose piece pattern
4. never used in pattern marking operation
never used in pattern marking operation
1. oblique red trips
2. yellow cross strips
3. black cross strips on yellow
4. oblique red strips on yellow
oblique red strips on yellow
1. 1-5 m/m
2. 5-10 m/m
3. 10-15 m/m
4. 15-20 m/m
10-15 m/m
1. shrinkage and finish
2. distortion
3. both (a) and (b)
4. do not exist
both (a) and (b)
1. gate
2. runner
3. riser riser vertical passage
4. vertical passage
vertical passage
1. finish is uniform and reasonably smooth
2. no complex wooden pattern with loose piece pattern is required
3. no cores are required
4. no allowance and less metal is required
5. all of the above
all of the above
1. provide benting
2. induce directional solidification
3. compensate shrinkage
4. support the core
support the core
1. mould cavity
2. pattern
3. casting during solidification
4. casting after solidification
casting after solidification
1. 1:1
2. 2:1
3. 1:2
4. 1:1.5
2:1
1. split pattern
2. skeleton pattern
3. solid pattern
4. sweep pattern
sweep pattern