Aluminum and acrylic Schmidt RPS

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More4dan

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I’ve had some free time on my hands lately and I’ve been wanting to try the Schmidt RPS Rollerball. This lets you use fountain pen ink in a rollerball tip. Supposedly you can swap the RPS with a #5 FP nib to make a convertible pen. I’ve found that to be not so easy with a JOWO #5 feed, the dimensions are different. Maybe the Schmidt #5 is closer. The body and cap are 6061 Aluminum finished with a brushed finish to help hide future wear. The section is Acrylic Acetate, made to accept the Schmidt K6 threaded ink converter.

All the parts were turned on a 7 x10 metal lathe using a pattern tracing modification to make the tapers. Using my new slow speed feed left a surface finish that only required sanding at 500 grit for the final brushed finish. The clip is from a PSI seam ripper kit. The section threads are M9 x 0.75 and the Cap threads are M11 x 0.80 triple start. The body is 11mm diameter and the cap is 13mm.

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Danny
 
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magpens

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VERY beautiful !!!

Thanks for the detailed specs !

I like the symmetrical ends ... no doubt due to your pattern tracing mod.

You musta had a seam ripper left over from a prev. project, eh ? ... :)

Where did you buy the nib ?
 

bmachin

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More4dan

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It certainly should be since Schmidt designed them to work that way. Although here's a link to a thread discussing the system from a few years back where somebody quotes Mike Redburn as saying that the JOWO #5 is a direct replacement(?).

https://www.penturners.org/threads/does-anyone-still-use-the-schmidt-prs.146836/#post-1911158

FWIW,
Bill

I’ve come up with a section design that should work for both the JOWO #5 FP and the Schmidt PRS. The JOWO section has a smaller diameter feed but has a larger diameter section at the very end near the nib. I think I can drill the front section designed for the Schmidt to also fit the front of the JOWO and work for both.

I want to try it out first, then I’ll post a drawing. I’d like to come up with a design that lets me switch back and forth between the two. Thanks for the link, I’ll check it out.

Danny


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More4dan

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I’ve successfully designed and made a front section that will work with a Schmidt PRS rollerball, a Schmidt #5 FP, and a JOWO #5 FP. I’ll make a separate post with details,photos, and dimensioned drawings.

Danny



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magpens

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Very nice, Danny !!! . Looking forward to the diagram(s) that you plan to post, now that you have achieved your goal ! . Thanks !
 
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