MAC 161-162 Machine Shop Practices I-II (3 cr.) (3 cr.) Introduces safety procedures, bench work, hand tools, precision measuring instruments, drill presses, cut-off saws, engine lathes, manual surface grinders, and milling machines. Prerequisite: MAC 161 is a prerequisite or corequisite for MAC 162. Lecture 2 hours. Laboratory 3 hours. Total 5 hours per week.