The mechanical capabilities We must have a good understanding of mechanical, because if we do not understand the device that will help us do the job. Our work may not be smooth.
Skill Machinery We must have an understanding of engineering as well. If we do not understand and that will help us work. Our work may not be smooth enough.
Mechanical ability We need to understand the mechanical as well. Because if we don't understand the equipment to help us work. Our work may be not smooth as it should be.