M-221 - M-226 High Resolution DC-Mike Actuators

M-222.20, M-224.20, M-226.20 DC-Mikes

M-222.50, M-224.50, M-226.50 DC-Mikes

• 10, 25 & 50 mm Travel Ranges
• Sub-micron Resolution
• Closed Loop DC Motor
• Sub-nm Resolution with Optional PZT Drive

M-222 through M-226 are compact, ultra-high resolution linear actuators providing linear motion up to 50 mm with sub-micron resolution. They consist of a micrometer drive with non-rotating tip driven by a closed loop DC motor/gearhead combination with motor shaft mounted encoder. Compared to conventional rotating tip micrometer drives the non-rotating tip design offers the following advantages:

• elimination of torque-based stage platform tilting
• elimination of wear at the contact point
• elimination of tip angle dependent wobble

All models feature an extremely low stiction/friction construction allowing for resolution in the 0.1 micron range and below. All models come with standard flat tips (click here for spherical tips and other options).

Versions with the part number extension .50 employ an even higher resolution motor/gearhead/encoder combination, providing design resolution of 8 nanometers and velocity up to 1.5 mm/sec. The high resolution encoder also provides better speed regulation at very low speeds.

An optional piezo tip features 20 µm travel with sub-nanometer resolution for dynamic scanning and tracking (click here).

For mounting, the DC-Mikes are clamped around the 19 mm diameter. Clamping around the 16 mm diameter sleeve should only have a supporting function; high forces at this point will increase friction and reduce accuracy and resolution. For the same reason lateral forces on the tip must be avoided.

Vacuum Versions:
Vacuum compatible versions (10^-6 Torr) of all .20 versions are available. Vacuum modifications are: vent holes, non anodized parts, special vacuum greased motors/gears/drive screws and encoders with Teflon cables. To order a vacuum model, change last digit to 3, e.g. M-224.23.