The machine shop is an add-on to the terranfactory building. The machine shop allows the user to build more advanced armor units such as the siege tank as well as upgrades for the various units that are created in the factory. It has been in use since the Guild Wars.
The machine shop does not appear in StarCraft II; instead the factory can be attached to a tech lab.
This greatly increases the damage and range of the siege tank's attacks, and gives them splash damage, but prevents the tank from moving. In siege mode, the siege tank has a minimum range it cannot attack within.
Gives each vulture three spider mines. Vultures cannot replenish their supply of mines once expended. New mines may only be created with new vultures.
Mines burrow where deployed and are not player-controllable. Each mine causes 125 damage and has 20 hit points. Mines do not benefit from any upgrades. Air and hovering ground units do not activate mines. Mines can sense and attack nearby cloaked ground units such as ghosts or dark templar even without the aid of a detector. They will not, however, reveal cloaked enemy units. It is possible for ranged units to pick out the mines before being hit.