{"id":1369,"date":"2022-08-10T17:24:55","date_gmt":"2022-08-10T08:24:55","guid":{"rendered":"https:\/\/rpv.shin-test3.net\/?p=1369"},"modified":"2022-08-16T13:27:28","modified_gmt":"2022-08-16T04:27:28","slug":"%e3%83%90%e3%83%b3%e3%82%b8%e3%83%a7%e3%83%bc%e3%83%95%e3%82%a3%e3%83%83%e3%83%86%e3%82%a3%e3%83%b3%e3%82%b0-%e3%81%ae%e5%86%85%e9%83%a8%e6%a7%8b%e9%80%a0","status":"publish","type":"post","link":"https:\/\/rpv.shin-test3.net\/en\/blog\/1369\/","title":{"rendered":"Observation of the internal structure of banjo fittings by X-ray CT"},"content":{"rendered":"

Hello, RPV.<\/p>\n

In the midst of the Corona disaster, I have been too lazy to go far away from home and have been devoting my energies to the maintenance of my motorcycle.<\/p>\n

I made a stainless steel mesh brake hose with banjo fittings. I can't find any manuals on how to make it, so I made it my own way, but the internal condition of the hoseI was curious about the inside of the body, so I decided to scan the inside of the body with an X-ray CT.<\/span><\/p>\n

First, scan only aluminum fittings that are easily penetrated by X-rays.<\/p>\n

\"\"<\/p>\n

 <\/p>\n

The figure below is a CT scanned cross-sectional image. The internal structure can be clearly seen. There was a tightening allowance of approximately 6.5 turns of the nut.<\/p>\n

\"\"<\/p>\n

 <\/p>\n

 <\/p>\n

It consists of three parts: banjo body, olive, and nut.<\/p>\n

\"\"<\/p>\n

Trim the ends of the stainless steel mesh hose to be used.<\/p>\n

\"\"<\/p>\n

 <\/p>\n

Attach the olive to the hose. At this time, the stainless steel mesh should be installed as it is, with the end faces aligned with the internal Teflon hose, and without cutting it particularly short.<\/p>\n

\"\"<\/p>\n

 <\/p>\n

The key point at this point is to push the olive in just enough to contact the Teflon hose, as shown in the CT cross-sectional image below.<\/p>\n

\"\"<\/p>\n

 <\/p>\n

I inserted the hose into the banjo and tightened the nut about 5 turns.<\/p>\n

\"\"<\/p>\n

 <\/p>\n

The image below is a cross-sectional image. I thought the stainless steel mesh would surround the olive a bit more and go deeper into the banjo side, but not as much.<\/p>\n

\"\"<\/p>\n

 <\/p>\n

For your information, I used stainless steel banjo fittings (20\u00b0) for my vehicle. I covered the nut and hose with waterproof type heat-shrinkable tubing to prevent adverse effects of car wash and rainy weather (e.g., corrosion of olives).<\/p>\n

\"\"<\/p>\n

 <\/p>\n

For reference, here is a cross-sectional image. I think the stainless steel mesh is fastened in a nice way at the taper of the olive and nut. The stainless steel mesh tends to shorten laterally in the image below because it tapers open when incorporated. The Teflon hose is thin and hard to see in the image because the x-ray energy was increased to penetrate the stainless steel.<\/p>\n

\"\"<\/p>\n

This time it was about the internal structure of the stainless steel mesh hose. It is nice to have a CT like this to see what the inside looks like without having to disassemble it!<\/p>\n

See you later.<\/p>","protected":false},"excerpt":{"rendered":"

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