A machinist is a tradesperson or trained professional who operates machine tools, and has the ability to set up tools such as milling machines, grinders, lathes, and drilling machines.
Machinist, operating a metal lathe
Machinery repairman creates helicopter part aboard an aircraft carrier
Many women worked as machinists in the United States during World War II, sometimes referred to as 'Rosies'.
A machinist operating a drill press in 1917
A tradesperson or tradesman/woman is a skilled worker that specialises in a particular trade. Tradesperson (tradesman/woman) usually gain their skills through work experience, on-the-job training, an apprenticeship program or formal education.
Welder
A tradesmen's entrance in London