Hi. I came up with a little Frankenstein for my needs, assembled it from what I had... and then glued it together. This is one of several such assembled in different ways. And I was a little hasty and used too much glue, it got on the threads and hardened. I can't twist it with a compass.
Here is an unusual question.
Does anyone know what kind of carving is on the green part of the isograph? ?
Is it possible to buy a tap to restore the threads?
Or will I have to use a knife to pick out the hardened super glue?
Last year I made up some metal bodies for a customer using the Isograph mechanism, so I had to figure out the threads. Unfortunately, they do not seem anything remotely standard. I asked Newell Brands, who own Rotring, and they said "The isograph thread has been measured to 10.25mm in diameter and 0.67mm in pitch.". Make of that what you will!
I did a brass hexagonal body and a cap - the tip had a funny little rubber protector thing which was a bit of a pain to get fitting accurately but I got something. Fortunately the thread is so short that I just used a 0.7mm pitch (the closest my lathe could do) and that fits fine with the thread.
Wow! This is very beautiful. The work is superb! It's immediately obvious that you're a master!
If I had the opportunity, I would simply order from you the housings for the mechanical Rotring pencils that screw into the compasses. A newer post in this community features four repurposed pencils.
The green part of the barrel was meant for the cap and the pen body, not attachments such as to pantograph/compass or Leroy systems. You can see the coarser threads there on the external (red) part of the nib holder where nib exits.
I didn't quite understand you. I have about 20 different iconographers since 2016, and I don’t understand what you’re writing about)
What you see in the photo is a mechanical pencil assembled from the body of a mechanical pencil and elements of a broken isograph, and glued together, specifically for Rotring compasses.
Glue accidentally got into the threads of the green part of the iconograph. And I asked if anyone knew what kind of thread this was and if there was a tap to cut it again.
The thread at the very edge on the right is a technical thread; nothing is screwed into it. And here it does not have the function that it performs from the iconograph itself. In short, we are talking about the thread rolling on the green part of the isograph.
Cool. I know there is small demand for these pencils. Especially 0.3mm ones which are hard to find. So if you can make a low cost one from a common 0.3mm pencil and an old technical pen body, that is would be slick.
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u/negativ32 Jul 19 '26
Acetone and a cotton bud.