Verified application · Medical Devices
Low-backlash transmission for surgical-robot joints
A compact reducer gear package for surgical robot joints, built around low backlash, high torsional stiffness, clean documentation and lot-level traceability.
Customer context
A medical device OEM needed a repeatable transmission package for a compact surgical robot joint. The design team was not only buying gears; they needed an assembled motion stack that could be reviewed by mechanical, quality and supply-chain teams without creating a new round of questions at every prototype build.
Application challenge
Three constraints that define performance
Wolfer solution package
Review every critical interface as one drivetrain
- Class 5 ground gear set with controlled tooth contact and backlash window.
- Micro gear shafts manufactured to the same datum strategy used in the customer assembly.
- Zero-backlash flexible coupling selected for torsional stiffness and misalignment allowance.
- Keyless locking connection to avoid fretting and simplify joint serviceability.
Engineering approach
From drawing review to inspection release
Reviewed backlash stack-up from gear pair to coupling interface instead of treating each part independently.
Aligned inspection datums with the customer's joint housing and bearing seats.
Marked matched components and provided lot traceability for prototype, pilot and reorder builds.
Validation evidence
Validation records available with delivery
- ✓Gear inspection report with lead, profile and pitch data.
- ✓CMM dimensional report for shafts and critical mounting features.
- ✓Material certificate and heat-treatment record.
- ✓Serialized packing label and reorder drawing reference.
Result
Project outcome and reorder value
- The assembled joint stack verified backlash under 5 arc-min, with ±0.005 mm pitch error on the Class 5 ground gear set.
- Mechanical, quality and supply-chain review passed in one round — every part arrived with gear report, CMM data, material certificate and heat-treatment record.
- The serialized documentation package carried unchanged from prototype to pilot build, so reorders referenced the same drawings and lots.
VERIFIED OUTCOME
Low-backlash reduction drives with full inspection documents and batch traceability
For surgical-robot joints, Wolfer engineers around low backlash and high torsional stiffness — shipping tooth-contact, hardness / heat-treat records and batch traceability with every order; high-precision helical gears with optimized profiles absorb vibration and shock and cut running noise to meet medical requirements for accuracy and quiet operation.
< 5 arc-min
Backlash target
100% inspection + traceability
Document pack with every shipment
Low noise
Helical / optimized profile
Information needed to start
Prepare these inputs for a faster engineering review and quotation
- Joint layout or reducer drawing with center distance, ratio and envelope limits.
- Backlash target, torque range, duty cycle and expected service life.
- Required certificates, inspection format and serialization requirements.