Plus or minus 5 degrees of motion
Resolution of 2 micro-radians
Repeatability 2.5 micro-radians

That would be the MicroTheta-5 direct drive rotary table!

. Ultra-compact: Only 20mm high x 54mm wide x 88mm long!
. 2 micro-radian (0.4 arc-second) resolution, repeatability & stability
. +/- 5° travel
. 360° per second top speed
. 15mm through-bore
. 15,000 counts per second 2 angular acceleration

Micromech is pleased to introduce the MicroTheta-5 Rotary Stage, which is an ultra-compact direct drive rotary table and provides very high performance rotary positioning in an exceptionally small package (20mm high x 54mm wide x 88mm long).

It is ideally suited for photonic alignment and life science applications by providing ±5° of motion with a resolution, repeatability, and stability of only two micro-radians (0.4 arc seconds). The direct drive motor has no contacting parts and drives the rotary table directly via magnetic fields. The motor is a two wire, single phase design, and can hence be driven by any brush type servo amplifier.

A 15mm through-bore allows optical paths or cables to be routed through the main bearing. The MicroTheta-5 Stage features built-in limit switches as well as a unique index signal repeatable to two micro-radians. A removable cover on the side of the unit allows large angle manual rotation through 270°; in conjunction with a master sphere ball, this allows precision location of the rotary axis.

Note: A pair of these stages can be co-mounted so as to produce a high performance actual (as opposed to virtual) pivot, of considerable value in fibre, collimator, and filter alignment

Specification

Table Diameter                                38mm
Through-bore Diameter                 15mm
Accuracy                                            ± 90 micro-radians (± 18 arc seconds)
Resolution                                        2 micro-radians (0.4 arc seconds)
Bi-directional Repeatability           2.5 micro-radians (0.5 arc-second)
Maximum Speed                             360°/s
Maximum Angular Acceleration    15,000 counts per second 2
Axial Motion                                       <2 microns
Radial Motion                                   <2 microns
Tilt Motion                                          <40 micro-radians
Axial Load Capacity                         5kg centered about vertical axis
Axial Stiffness                                   8.6 x 10 7 N/m
Radial Stiffness                               2.7 x 10 6 N/m
Torsional Stiffness                          4.2 x 10 3 N-m/Rad
Total Mass                                        0.31kg
Connector Mass                              0.14kg
Rotational Inertia                             5.50 x 10 -5 kg-m 2
Motor Torque Constant                   0.07 N-m/A
Back-emf Constant                         0.07V/Rad/s
Coil Resistance                               4.3 Ohms
Coil Inductance                                1.28 mH
Continuous Current                         1.2 A
Peak Current                                     3.6 A
Motor Continuous Torque               0.085 N-m
Motor Peak Torque                           0.250 N-m
Fundamental Motor Constant         0.034 N-µWatt
Motor Type                                          Direct Drive
Travel                                                  ±5°