- #31
evi7538
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I got pretty good results with NEMA 14 stepper and ceramic ABEC5 bearings: the positioning noise is around 3 arcsec RMS, good enough for my project
What Are the Best Low-Friction Bearings for Precision Positioning Mechanisms?
- Thread starter evi7538
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- Friction
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Discussion Overview
The discussion revolves around the selection of low-friction bearings for a precision rotational mechanism intended for angular positioning of an optical element. Participants explore various bearing types, their specifications, and alternative methods for achieving high positioning repeatability and low noise in a compact and cost-effective design.
Discussion Character
- Exploratory
- Technical explanation
- Debate/contested
- Mathematical reasoning
Main Points Raised
- One participant describes the need for a mechanism with a total rotation of about 50 degrees, requiring high repeatability below a few arc seconds, and discusses the limitations of using stepper motors with precision planetary gears.
- Another participant suggests magnetic levitation as a potential solution but notes concerns about power consumption and orientation issues.
- Some participants propose investigating voice coil actuators and servo mechanisms as alternatives to stepper motors for precision control.
- A participant shares a link to a comprehensive catalog on super precision rolling element bearings, emphasizing that seals are a significant source of friction and suggesting the use of filtered air to eliminate them.
- There is a discussion about the effectiveness of non-contact seals versus sealed bearings, with differing opinions on their ability to prevent dust ingress while minimizing friction.
- One participant mentions that cage friction is generally small with proper lubrication, but acknowledges that it could be a concern in low-load applications.
- Another participant highlights the importance of bearing specifications, including ABEC classes and materials, in achieving low friction and noise.
Areas of Agreement / Disagreement
Participants express a range of views on the best bearing options and methods for achieving low friction and high repeatability. There is no consensus on a single solution, and multiple competing ideas and approaches remain under discussion.
Contextual Notes
Participants note that the effectiveness of various bearing types and seals may depend on specific application conditions, such as load and environmental factors. Some discussions reference the limitations of certain bearing designs and the need for careful consideration of lubrication and sealing methods.
Who May Find This Useful
This discussion may be useful for engineers and designers working on precision positioning systems, particularly in optics and related fields, as well as those interested in bearing technology and its applications in low-friction mechanisms.
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