Servo Grade Worm Drive Gearboxes

Servo Belt Rotary Stage (SBR)

ServoBelt Rotary is a series of compact, high-torque rotary stages that offer through hole size and speed comparable to direct-drive rotary tables costing thousands more.

Big Through Holes, Small Package. Available in 50-, 100- and 200-mm through holes and profiles under 67-mm, these belt-drive stages are easy to integrate into tight machine envelopes. The large through holes leave plenty of room optics, utility connections, slip rings or more.

Direct Drive Performance. Designed for NEMA 23 motors, the belt-drive stages offer speeds up to 1,000 rpm, continuous torque to 6.6 N-m and accuracies down to 0.27 arc-sec with Renishaw ring encoders. Motor-to-table ratios optimized for inertia matching at high speeds.

Robust Bearings. ServoBelt Rotary incorporates large angular contact bearings for its size, imparting moment and load capacities far in excess of its usual application requirements. This excess load capacity, along with a lubed-for-life design, translates into virtually limitless bearing life.

Cost Effective. ServoBelt Rotary offers an economical solution for a variety of medium-duty rotary motion jobs such as driving carousel tables on packaging and assembly machines and providing fourth-axis rotary motion for laser cutting and mini CNC machines.

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TECHNICAL SPECIFICATIONS	SBR-50	SBR-100	SBR-200
Type	NEMA 23 3:1 Belt Drive Rotary	NEMA 23 5:1 Belt Drive Rotary	NEMA 23 or 34 11:1 Belt Drive Rotary
Bearing type	Preloaded duplex angular contact
Motor and Encoder Type	3-phase brushless motor, with 16KCPR encoder or ring encoder
Through hole	50.8 mm (2.00 in.)	101.6 mm (4.00 in.)	203.2 mm (8.00 in.)
Accuracy (±arc-sec)Deviation from commanded angle.	16KCPR: 90 Ring: 16	16KCPR: 75 Ring: 16	16KCPR: 60 Ring: 16
Kinematic wobble (±arc-sec)Tilt of rotary axis irrespective of table flatness or physical runout of table top OD.	16	8	8
Kinematic radial runout (µm TIR)In-plane wander of rotational centerline irrespective of table roundness or physical runout of table top OD.	8	8	10
Table top parallelism to base (µm TIR)Total indicated worse-case parallelism top to bottom.	25	25	35
Table top physical radial runout (µm TIR)Total indicated runout of the outer diameter of the rotating table under stationary indicator at the table’s outer edge.	10	10	15
Bi-directional repeatabilityWith motor encoder versions only, assumes 0.2 degrees lost motion at pinion, divided by ratio.	16KCPR: ±120 arc-sec Ring: Control Dependent, ±1 count possible	16KCPR: ±40 arc-sec Ring: Control Dependent, ±1 count possible	16KCPR: ±100 arc-sec Ring: Control Dependent, ±1 count possible
Uni-directional repeatabilityAngular conversion of 10μm at bull gear radius.	16KCPR: ±30 arc-sec Ring: Control Dependent, ±1 count possible	16KCPR: ±12 arc-sec Ring: Control Dependent, ±1 count possible	16KCPR: ±15 arc-sec Ring: Control Dependent, ±1 count possible
Resolution choices	16KCPR: 16k @ motor Ring: 1 μm, 0.5 μm, 0.2 μm, 0.1 μm (100 mm ring)	16KCPR: 16k @ motor Ring: 1 μm, 0.5 μm, 0.2 μm, 0.1 μm (150 mm ring)	16KCPR: 16k @ motor Ring: 1 μm, 0.5 μm, 0.2 μm, 0.1 μm (255 mm ring)
Table resolution (KCPR)Measured in thousands of pulses per revolution of the table (KCPR).	16KCPR: 48 Ring: 314.9, 629.8, 1574, 3149	16KCPR: 80 Ring: 472, 944, 236, 4720	16KCPR: 176 Ring: 800, 1600, 4000, 8000
Speed limit (RPM)Note that maximum speed for ring encoder units decreases as resolution increases.	16KCPR: 1300 Ring: 1300-134	16KCPR: 800 Ring: 764-66	16KCPR: 360 Ring: 374-52
Continuous torque (N-m, motor)RMS torque allowed at table. Assume peak torque to be 3 times RMS torque for no longer than 3 seconds.	2.4(-2), 3(-3), 4.0(-4)	4.1(-2), 5.1(-3), 6.6(-4)	NEMA 23: 9.0(-2), 11.2(-3), 14.5(-4) NEMA 34: 20(-2), 30(-3), 38(-4)
Load capacity axial/radial (kN)Load capacity for L10 rating life of 1 million table revolutions. Load capacity is not equivalent to payload. The ability to servo control a given payload is dependent on inertia, motion profile, duty cycle and control architecture.	8.6 / 7.7	14.0 / 11.7	25/21
Maximum moment (N-m)Moment loads are for L10 rating life of 1 million table revolutions.	120	370	1050
Rotational inertia (kg-m²)Rotational inertia of table.	16KCPR: 0.00018 Ring: 0.00047	16KCPR: 0.005 Ring: 0.006	16KCPR: 0.037 Ring: 0.046
Stage weight (kg, less motor)	1.32	3.3	7.5
Recommended payload maximum, kgBearing capacity is far in excess of these numbers for enhanced bearing life. Ability to control recommended payloads entirely dependent on move profile and moment of inertia.	10	25	100

Servo Belt Rotary Stage (SBR)

Servo Belt Rotary Stage (SBR)

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