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Parker 50 (Falcon) Feed Removal

liquid nitrogen glue

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13 replies to this topic

#1 Mookli

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Posted 13 August 2015 - 16:10

Greetings,

I have a Parker 50 Falcon with a bent nib, and although I gauge the chance of a perfect repair very slim, I will try my best.

 

The initial problem was the glued in feed. I applied all the reasonable force as I dare, but it didn't budge.

And then I remembered the coefficient of linear thermal expansion!

Approximate numbers are, Stainless  16 X 10-6 and ABS Thermoplastic 73 X 10-6

(meter per meter per degree kelvin)

So cooling it down will make the plastic shrink more than the stainless. Besides that, adhesives generally don't perform well cold.

 

So I made sure it was completely dry, stuck it is liquid nitrogen for about 30 seconds, felt a small pop, and the nib / section came right off.

I could have tried a regular freezer first, but LN is more fun!

 

Everything warmed back up with no damage.

 

Parker%2050%20nib-L.jpg

 

 


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#2 Flounder

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Posted 13 August 2015 - 16:41

You rock!


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#3 Sasha Royale

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Posted 13 August 2015 - 21:26

What of the plastic ?   Please keep us posted.  


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Verweile doch, du bist so schön ! 


#4 Mookli

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Posted 13 August 2015 - 22:39

Went OK, not 100% but functional.

 

Parker%2050%20nib-fix-L.jpg


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#5 Mookli

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Posted 13 August 2015 - 22:43

What of the plastic ?   Please keep us posted.  

Plastic is fine.

It might be brittle when cold so I just left it alone to warm up.

I cleaned it in the ultrasonic, and avoided contamination from fingers. (oil)

It friction fit back into the section / nib


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#6 Flounder

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Posted 14 August 2015 - 01:07

Reading through the PCA manuals, these were epoxied in, so you did well to get the section apart. Nib looks good.

 

These are surprisingly small pens in the hand!


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#7 sweilem

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Posted 27 March 2016 - 20:01

Great chemistry in action!!!


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#8 therealnibcreep

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Posted 03 June 2016 - 08:48

Very handy little trick. I was looking for a way to remove the nib from the feed, and this is the only hands on advice. Since I don't have access to liquid nitrogen I used spray on chewing gum remover to achieve the same effect.

 

I have a description on my blog.

 

Thanks so much for providing this method!


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#9 Gloucesterman

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Posted 07 June 2016 - 21:56

Darn, I just gave away my last supply of liquid nitrogen to the local fish processing plant! Now I have to go out and get some more just in case I need it again. :mellow: :mellow: :mellow: !


“Don't put off till tomorrow what you can do today, because if you do it today and like it, you can do again tomorrow!”


#10 ac12

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Posted 07 June 2016 - 23:04

How cool :)
Now to find a source of just a quart of liquid N.

Edited by ac12, 07 June 2016 - 23:04.

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#11 Mookli

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Posted 09 June 2016 - 04:27

Hi all,

 

They make a series of spray can freezers.

Google   "freeze in a can"  to see a bunch.

They use 1, 1, 1, 2-Tetrafluoroethane. a common Refrigerant gas, The expanding gas will generate temperatures down to about -60 deg.

 

I use this stuff

http://www.amazon.co...r/dp/B000ICBP68

 

This might be more practical for small thermal shock projects.

 

Mark


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#12 spaceink

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Posted 21 February 2017 - 21:50

Hello, I've recently acquired a Falcon 50 TX with flow issues, even after numerous soaks. I want to get to the feed for a thorough cleaning but don't think I'll have any liquid nitrogen on hand soon and want to avoid having to get a coolant can if possible.

 

Has anyone tried this with some time in the good ol' freezer? How did it go?

 

Also, am assuming that I'll have to push the feed out from the exposed part in front towards the back end?

 

Thanks ahead for any answers. 



#13 Mookli

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Posted 22 February 2017 - 00:52

I think the freezer will work too, It should not require a lot of pushing, but just come free.

Make sure it is dry before putting it in the freezer.

Good luck and let us know how it went.

 

Mark


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#14 spaceink

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Posted 22 February 2017 - 05:56

Well, after a few rounds of freezing for about an hour and attempts at coaxing out the feed, nothing has popped out. The upside is that each time, some very dark gunk also seemed to be seeping out, as made apparent by my blackened fingers. The nib seems to be flowing a bit better when I last fitted the pen's converter with some Diamine ink. So feed removal failure via my attempted freezer approach, it appears, but I may not need it done now. Thanks for your advice in any case. Cheers!


Edited by spaceink, 22 February 2017 - 05:57.






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