Penultimate
Member
Greetings
I purchased a piston and piston barrel with ink window (#20223 & 20226) from Richard Greenwald and thought I'd share my design.
The parts are inexpensive I think the piston was $8 and the barrel was $0.30.
As you can see from the photo the barrel consists of an ink window with a turn down area for the section and a black barrel with the same diameter as the ink window. The piston is nicely made with a straight knurled cap to advance and retract the piston.
For my design the barrel needs some modifications. The section area has a thread but I couldn't identify what type of nib unit it accepts. It doesn't accept a #5 or 6 nib unit.Luckily, that there was a small bore close to the ink window that I could drill out and tap for a #5 Schmidt nib. The black tube presented some design challenges as well. I thought I could turn down the OD a little and thread a 7/16-20 for a blind cap to cover the knurled piston nob. There wasn't enough wall thickness and I didn't check it so I messed it up and had to shorten the tube a little. I turned the black tube down to 7/16 so i could bore out the body. That leaves the body a little proud of the ink window. The 1/2-32 thread on the section is also proud of the ink window a little.
I used the nib cover provided and it seat the nib/section nicely but something happened and it didn't seat deep enough in the cap. I intention was for the ink window to be covered when capped. Oh well, I'll figure it out next time.
I like the assembly and will probably make another.
The clip is handmade.
Thanks for looking. I posted more finished pen photos in SOYP
I purchased a piston and piston barrel with ink window (#20223 & 20226) from Richard Greenwald and thought I'd share my design.
The parts are inexpensive I think the piston was $8 and the barrel was $0.30.
As you can see from the photo the barrel consists of an ink window with a turn down area for the section and a black barrel with the same diameter as the ink window. The piston is nicely made with a straight knurled cap to advance and retract the piston.
For my design the barrel needs some modifications. The section area has a thread but I couldn't identify what type of nib unit it accepts. It doesn't accept a #5 or 6 nib unit.Luckily, that there was a small bore close to the ink window that I could drill out and tap for a #5 Schmidt nib. The black tube presented some design challenges as well. I thought I could turn down the OD a little and thread a 7/16-20 for a blind cap to cover the knurled piston nob. There wasn't enough wall thickness and I didn't check it so I messed it up and had to shorten the tube a little. I turned the black tube down to 7/16 so i could bore out the body. That leaves the body a little proud of the ink window. The 1/2-32 thread on the section is also proud of the ink window a little.
I used the nib cover provided and it seat the nib/section nicely but something happened and it didn't seat deep enough in the cap. I intention was for the ink window to be covered when capped. Oh well, I'll figure it out next time.
I like the assembly and will probably make another.
The clip is handmade.
Thanks for looking. I posted more finished pen photos in SOYP