u/CountDeMounteCristo

I'm a beginner so these questions may sound simple, but I appreciate if you can give me the answers.

I recently disassembled a pneumatic jack to service it (a few parts were damaged). During disassembly I came up with some questions that I just cannot solve.

1. Why the piston has these extended legs? Why not remove them like a shock absorber piston? I know they help with the alignment of the piston so it doesn't tilt but we have a bushing for the shaft that aligns it all the time.

2. The extended leg goes inside the end cap and there is a seal with weird geometry (castle like) for it! Why go there and why seal it???

3. There is a adjustment valve on the side. What is the purpose of that?

Btw the end cap and piston are both damaged badly and I'm replacing them. Attached a photo of the piston to see how it failed!

I'm a beginner so these questions may sound simple, but I appreciate if you can give me the answers.

I recently disassembled a pneumatic jack to service it (a few parts were damaged). During disassembly I came up with some questions that I just cannot solve.

1. Why the piston has these extended legs? Why not remove them like a shock absorber piston? I know they help with the alignment of the piston so it doesn't tilt but we have a bushing for the shaft that aligns it all the time.

2. The extended leg goes inside the end cap and there is a seal with weird geometry (castle like) for it! Why go there and why seal it???

3. There is a adjustment valve on the side. What is the purpose of that?

Btw the end cap and piston are both damaged badly and I'm replacing them. Attached a photo of the piston to see how it failed!

We have a manual lathe at our workshop that we added an controller to and we can program it now. It was unable to thread however. I designed an encoder mount and a synchronous pulley system to add to the existing base. There are three ABS 3d printed parts and an aluminium milled part. We connected this encoder to our controller to add threading capability to it.

We have a manual lathe at the workshop which we turned into semi-cnc and we can program it. However it was unable to do threads because of the lack of an encoder. I did a design consisted of three 3d printed parts and an aluminium machined part to place the encoder without interference and with a tightening function.