- Joined
- Sep 3, 2023
- Messages
- 339
I work in a hydraulic rebuilding shop. I ran across an odd pipe size today. It is on an internal port tube, inside the chrome OD rod of a cylinder. This is because both ports to this cylinder are connected thru the rod end mounting.
The piston end of the port tube is sealed in the end of the rod with two o-rings. Somewhat typical.
The other end is threaded into the rod end mounting. With tapered threads. The OD of the port tube is .750”. Here is the wierd part, the threads are 16 TPI.
Ok, so maybe not so wierd, since the tube is in between 3/8” pipe and 1/2” pipe size. Pipe threads are usually 18 TPI.
So my co-machinist asked me to do these threads for him. He has never used the taper attachment on his lathe, and I have several times. This will be the first time making tapered threads though.
I’m guessing the OEM manufacturer had special tooling made up to make this originally.
We would have liked to reuse the old port tube , but it took on the z shape of the bent rod.
Sent from my iPhone using Tapatalk
The piston end of the port tube is sealed in the end of the rod with two o-rings. Somewhat typical.
The other end is threaded into the rod end mounting. With tapered threads. The OD of the port tube is .750”. Here is the wierd part, the threads are 16 TPI.
Ok, so maybe not so wierd, since the tube is in between 3/8” pipe and 1/2” pipe size. Pipe threads are usually 18 TPI.
So my co-machinist asked me to do these threads for him. He has never used the taper attachment on his lathe, and I have several times. This will be the first time making tapered threads though.
I’m guessing the OEM manufacturer had special tooling made up to make this originally.
We would have liked to reuse the old port tube , but it took on the z shape of the bent rod.
Sent from my iPhone using Tapatalk