A mechanic whose occupation is to build mills, or to set up their machinery.

a workman who designs or erects mills and milling machinery

a technician who specializes in installing and repairing industrial machinery

Derived from the trade of carpentry, a millwright originally was a specialised carpenter who was trained as a carpenter and as well had working knowledge of gear ratios, driveshaft speeds, and other equations. The "mill" in millwright refers to the genesis of the trade in flour mills. Biographies of some millwrights who were located in Norwich, England can be found http://www.norfolkmills.co.uk/Millwrights/millwrights.html here.

a sort of troubleshooter

a skilled tradesman responsible for moving and assembling office furniture

one who designs or builds mills. Example