Eureka Titanium Alloy Nib Manual

* More details will be continually updated to the current version of the manual in the future.
 
◆ Basic Detail Regarding the Nib
1) Material: Titanium alloy Grade 23 ( = Grade 5 ELI )
"Extra low interstitial" (ELI) refers to a grade of titanium alloy, specifically Ti-6Al-4V (Grade 5) ELI, where "ELI" stands for "Extra Low Interstitials". This designation indicates a version of the standard Ti-6Al-4V alloy with significantly reduced levels of interstitial elements like oxygen, nitrogen, and carbon. 
The reduced interstitial content results in improved ductility, fracture toughness, and biocompatibility, making it suitable for demanding applications. 
2) Material Origin: Germany or USA (will be specified on the each pen on sale)
3) Nib size: Vertical line M (0.6~0.7mm) / Horizontal line F (0.4~0.5mm)
4) titanium alloy hardness: Moh 6~6.5
* typical "iridium-point" hardness: about Moh 6.5~7.5. Really hard ones estimated to be Moh 7.5+
* stainless steel = ~6 / iridium = 6.5 / osmium = 7 / tungsten = 7.5 / hardened steel = 7~8 / tungsten carbide = 9 / diamond = 10 
5) this nib will spring back even if a large force is applied. the material has great returning properties, like a spring. Way more springy than typical gold or steel nibs that I experience.
* a very strong writing force is not recommend for this type of nib, because the tip is less hard than typical nib points.
* the ebonite feeder will provide ample amount of ink. Using the ink as lubricant and with light pressure, you will be able to glide the nib on the paper effortlessly. This will decrease friction and increase nib longevity.
6) this nib is 100% precision-machined from a solid titanium rod
7) nib fixation method: thread-type. Easy disassembly, cleaning, and maintenence.
8) O-ring seal applied for the frontal grip area, so ink will not seap out between grip frontal hole area.
9) Nib - Feed assembly method: angular fixation + thread locking (precision within 0.05mm, appropriate tolerance for easy assembly) 
10) nib hole / feeder OD tolerance 0.05mm (appropriate tolerance for easy assembly)
11) Ultem / Ebonite feeder precision (outer diameter) = ±0.01mm
12) a powerful surface hardening treatment applied
13) initially the nib point is grinded in such way slight resistance is felt. however this resistance will disappear as the pen is used. Initial taming of the point is faster than conventional nib point alloys. After initial taming the nib will become very smooth.
 
 
◆ Nib size: Vertical line M (0.6~0.7mm) / Horizontal line F (0.4~0.5mm)
Left: Vertical line thickness
Right: Horizontal line thickness

 

◆ Maximum effective nib point length = 5mm
1) because the titanium point is less hard than typical nib point alloys, the titanium point design is much elongated to maximize the nib longevity.
2) multiple regrind of the nib is possible by the user. 
3) the user can grind the nib thickness and shape, if needed.
* it is less demanding to to grind than typical nib point alloys. so regrinding the nib point is relatively easier.
* do note that the titanium alloy is harder than stainless steel, so it may take some effort to grind the titanium.
 

 
 
◆ Feeder design optimized to maximize the effective nib point length (at 45 degrees).
Robust feeder design, so accidental breakage while disassembly is unlikely.

* when first filled with ink, initially ink flow may be greater than usual as the feeder is not fully wetted yet. But this should stabilize within several hours, and afterwards it will fully normalize.
* when first filled with ink, please point the nib upwards while carrying around to prevent any leakage.
after the feeder normalizes, this may not be necessary (except extreme circumstances).

 
 
initially developed ULTEM feeder (currently not on sale due to hydrophilicity issue, more research is needed to make it fully functional)

 
 
Instead of the ULTEM feeder, Ebonite feeder has been subsequently developed.
Considerable structure design changes are applied, compared to the ultem feeder.
All current models that uses titanium nib will be equipped with the ebonite feeder.

 

◆ The nib point is designed in such a way, so that the writing thickness will be even across all range of the nib point length.
* initially the thickness will be thin because the end of the point is rounded.
* as the round point wears down, the writing thickness will increase (unless a regrind is done).

 
◆ How to remove / install Nib & Feeder
see here: https://eurekafp.com/977

How to remove / install feeder (for titanium nib)

 

◆ methods of pen ink refill.
1. standard method of removing the cartridge and directly filling the cartridge with syringe / spoid.
2. after removing the titanium nib (open counterclockwise), directly filling into the grip section hole with syringe / spoid.

3. when filling ink, you must aim at the inner wall of the cartridge and inject slowly. If you don't follow these, ink will not be able to flow down the wall, and ink will get stuck and spill out from the opening hole.

 
 
◆ writing test video
https://www.youtube.com/watch?v=yTHn1FBCksU