HRE-KIT / KEEP THE JOINT CENTRE OPEN
Shaftless Hollow Ring Kit Encoders
Bearingless off-axis ring and readhead concepts for robotic joints and compact rotary assemblies.
Ø15–110 mm target ring ID
17–21-bit target requests · BiSS-C / SPI
BORE ID × HOUSING OD × OUTPUT
Match the shaft before the signal.
The machine bearing supports the ring. The encoder readhead senses angle without a separate encoder bearing, leaving the centre available for cables or services.
| Model | Hollow bore ID / mounting | Housing OD | Resolution | Output circuit / protocol | Max RPM |
|---|---|---|---|---|---|
| HRE-KIT-R | Ring ID Ø15–110 mm project envelope | Ring OD & readhead footprint confirmed together | 17 / 19 / 20 / 21-bit target requests | BiSS-C / SPI / SSI / RS485 / ABZ by configuration | Confirm by gap & interface |
| HRE-KIT-LP | Open centre · bearingless | 6.5 mm stack-height design target, drawing review | Singleturn / multiturn method to confirm | Controller format and calibration review | Confirm by ring diameter |
Configuration request envelopes, not a released datasheet. Max RPM, exact bore, housing, resolution and protocol combinations require written confirmation. Inch and metric sizes are distinct.
Send your exact diameter and controller requirements →APPLICATION FIT / HRE-KIT
Robotic joints · direct-drive axes · rotary stages
Bring the machine constraints into selection before ordering a prototype.
- Readhead gap, radial eccentricity, axial runout and bearing play
- Ring inside and outside diameters plus complete axial stack
- Calibration method, latency, accuracy and multiturn power-loss behavior
01 / CHOOSE THE MECHANICAL INTERFACE
One shaft. Three ways to read it.
Through-hollow
A continuous bore lets the shaft pass through the encoder. Check clamp access and shaft clearance.
Blind hollow bore
A closed bore fits the shaft end. Check insertion depth and avoid bottoming out the shaft.
Shaftless ring kit
A ring and readhead use the machine bearing. Check sensing gap, runout and calibration.
Original engineering concepts. Not to scale; final housing, ring and mounting dimensions require an approved drawing.
HRE-KIT / ENGINEERING QUESTIONS
Resolve the fit before release.
Is HRE-KIT a confirmed AksIM-2 or Orbis equivalent?
No. RLS AksIM-2 and Orbis are comparison starting points. Confirm ring geometry, readhead envelope, accuracy and complete interface behavior.
Does 21-bit resolution prove 21-bit accuracy?
No. Specify your permitted angular error across speed and temperature separately from digital resolution.
ENGINEERING HANDOFF / HRE-KIT · Shaftless Hollow Ring Kit Encoders
Start with your shaft.
We’ll review the fit.
Send the exact bore, signal and application. Request a configuration review, quotation and matching STEP drawing in one inquiry.
[email protected] ↗Drawings and detailed specifications are confirmed for the selected configuration. Please include your original full model code for a replacement review.