Since you can only have one at a time, the available ability called "Turret Recovery" allows you to force a turret to leave the battle.

Another major feature of the Machinist is the Turret. There are two kinds of turrets. The Autoturret Rook has an elongated shape and can fire against a single enemy. Autoturret Bishop has a round shape and can perform attacks to enemies in an AoE around itself. Unlike Summoner Egis which are intended to persist with the Summoner, turrets are stationary and so they must be reinstalled from time to time. They have no endurance so they can't be used to tank, but they are quite dependable as a supporting attacker.The turrets also have further support effects. By using a specific action, the turret's mode can be changed to recover TP while consuming MP. The effect range is about the same as that of a Bard song. Bards have also seen upgrades so there should be no worry that Machinists will unseat them completely, but they will doubtless be an attractive option for long range physical attacks.