Product Description:

The HS35R03006342 hollow-shaft encoder is built by Danaher and belongs to the Dynapar Encoders series. Designed for feedback loops in motion control, it mounts over a machine shaft, monitors angular displacement, and returns timed pulse trains to variable-speed drives or PLC high-speed counters. By matching its bore to the driven shaft and using a ring tether, the device supplies accurate position and speed data without the backlash that can occur with belt or gear couplings.

A factory-machined 12 mm bore aligns the optical disk concentrically with the host shaft. The internal code wheel is incremental and generates 300 PPR, so one full revolution yields 300 evenly spaced pulses that downstream electronics can interpolate for finer resolution. High-speed operation is supported by a minimum frequency response of 100 kHz, allowing clean pulse reproduction even when the encoder spins near its upper speed limit. Output drivers follow the 7272 line driver standard, sourcing and sinking equal current into differential receivers while protecting signals against wiring noise. Field wiring terminates at a keyed 10-pin connector, and the cast aluminum housing with Buna seals carries a NEMA 4/IP66 enclosure rating for washdown or dusty plant areas. The moment of inertia is 7.9 × 10⁻⁴ oz-in-s², and running torque remains below 4.5 oz-in during steady motion.

The maximum mechanical speed is 3600 rpm, and duplex bearings tolerate a 40 lb radial load plus a 30 lb axial load without loss of accuracy. Starting friction is limited to 5.0 oz-in, which keeps acceleration torque requirements low on small servo axes. Overall mass does not exceed 16 oz, so the encoder places minimal additional load on the motor assembly. The low running torque and small moment of inertia help the unit track rapid changes in rotational direction. This operating behavior makes it suitable for indexing tables, pick-and-place heads, and other applications that experience frequent reversals.