Motorization is sometimes used to eliminate the need to turn handles manually, but is most often employed to greatly improve the precision, resolution and repeatability of positioning. The space between the two Teflon rotary seals is differentially pumped so the platform can operate at UHV pressures. Three different types are offered. It is recommended for light loads. Some models have electrical feedthroughs to take power to the mounting plate on the probe.
Magnetic drives are useful for low-torque applications such as rotating a sample for cleavage.
Magnetic drives cannot be motorized. It is particularly useful for sample transfer with a docking mechanism that needs rotation. Both linear motion and rotation can be motorized. With the sample entry port at atmosphere, the sample is mounted on a linear drive through the vacuum door. The door is closed and the load lock evacuated to base pressure with its own pumping station.