Designing Nut and Orifice fittings (brass)

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Discussion Overview

The discussion revolves around the design of a modified 1/4" BSP nut and orifice fitting, specifically focusing on the challenges of creating accurate CNC drawings and ensuring proper tolerances for the olive component to avoid issues with fit.

Discussion Character

  • Technical explanation, Debate/contested, Experimental/applied

Main Points Raised

  • One participant expresses difficulty in creating a CNC drawing for a modified fitting due to small tolerances and the need for precise design criteria.
  • Another participant suggests measuring existing components using small drills or piano wires as gauges and emphasizes the importance of Go/NoGo gauges for quality control.
  • A third participant provides a resource link for finding tolerances and dimensions related to BSP threaded fittings.
  • The original poster clarifies that the issue lies specifically with the design of the olive, which must be correctly sized to ensure proper fit without being too tight or too loose.

Areas of Agreement / Disagreement

Participants have not reached a consensus, as there are differing views on how to approach the design and measurement of the fitting components, particularly regarding the olive design.

Contextual Notes

Limitations include the lack of specific design criteria for the olive and the potential variability in material flow characteristics that may affect the fitting design.

GregFisk25
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Hi,
I get parts made in China, and I need to make a full CNC drawing.
It is a modified 1/4" BSP nut and orifice fitting. I cannot find anywhere how to draw the nut and orifice so they work correctly. This is the part they make the most mistakes with, as the tolerances are small.
It is not practical for me to try and measure the sizes and angles of an existing one. There must be design criteria available somewhere?
 
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Do you have a link to a similar product?

Why can you not measure an existing one?
Use a set of very small drills or piano wires as diameter gauges.
You will probably need Go/NoGo gauges later for QC on the delivered product.

What material flows through the orifice? What flow rate? What drives the flow?
 
Hi,
Thanks for the help.
It is not the orifice or thread I am having trouble with, purely the design of the olive - they need to be designed just right so they are not too tight or too loose.
 

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