Discussion Overview
The discussion revolves around the search for bearings or bushings that can operate underwater without housing, focusing on their resistance to rust and corrosion in various water conditions, particularly saltwater. Participants explore different materials and their suitability for long-term underwater applications.
Discussion Character
- Exploratory
- Technical explanation
- Debate/contested
Main Points Raised
- One participant inquires about bearings or bushings that can function underwater without housing and with minimal rust.
- Another suggests stainless steel bearings, noting that oxidation may be less of a concern than lubrication in underwater environments.
- A participant expresses skepticism about stainless steel's rust resistance, particularly for long-term underwater use, and emphasizes the need for lubrication.
- Discussion includes the importance of the type of stainless steel, with Stainless 316 mentioned as a marine-grade option that offers high corrosion resistance, though not completely corrosion-proof.
- Concerns are raised about galvanic corrosion in saltwater environments, prompting a request for clarification on this issue.
- Participants discuss the use of seals, o-rings, and gaskets as best practices for underwater bearings to retain lubrication.
- One participant expresses frustration over the lack of options for bearings or bushings that can operate without sealing in underwater conditions.
- A specific polyacetal bushing from Misumi is mentioned as a potential option, with questions about its compatibility with saltwater and a stainless steel shaft.
- Another participant suggests contacting Misumi Customer Service for specific guidance on the polyacetal bushing's suitability.
- Examples of existing underwater mechanisms using saltwater-impervious bushings are cited, raising questions about the materials used in those applications.
- There is a mention of Lignum Vitae as a potential material for underwater applications.
- Ceramic bearings are noted for their saltwater resistance, although they may only be available in smaller sizes.
Areas of Agreement / Disagreement
Participants do not reach a consensus on a specific solution for bearings or bushings that can operate underwater without housing. Multiple competing views and uncertainties regarding material suitability and application specifics remain evident throughout the discussion.
Contextual Notes
Participants highlight the importance of application specifics, including the type of water and the need for lubrication, which remain unresolved in the discussion. There is also a lack of definitive information on the performance of suggested materials in saltwater environments.