Mb149 Repair

[Rowbo]

Given that the C-ring can, sometimes, pull out without damaging the spindle then, if there is enough broken spindle remaining to get hold, it might be that it could be forcibly pulled out. The spindle might break again, but so what. I suppose there is a risk of cracking the cone or damaging the C-ring groove.

 

If one could gain access to the outside diameter of the ring then it might just be possible to hook it out with a dentists 'toothpick' or other very hard and sharp implement. This would need a slot to be cut, or possibly melted, on the inside face of the cone. Only part of the groove would be damaged.

 

Alternatively, a tool like a ~6mm diameter hole saw - if there is such a thing, to open out the bore to the outside diameter of the C-ring groove - would allow it to be easily pulled out. It would than be necessary to design and make a sleeve insert to replace the material that was removed. This could be either glued or preferably screwed in place.

 

Your thoughts?

[fountainbel]

The C-ring being extracted when screwing a" very thight" piston up was in fact a lucky coincidence !

Alternatively the leadspindle will shear-off ,as it happens in most cases.

As for getting the C ring out with a toothpick, I've tried this also several times with no succes

.

Rowbo ,on the alternative approach you suggest, I've been there,and it works

Adapting the filling knob bore "sleeve seat " perfectly concentric on the lathe, and making the enclosure sleeve with a thight fit is however much more work as the appraoch I actually use .

And.... future removal remains very difficult.

Francis

Edited March 10, 2012 by fountainbel

[Rowbo]

Fountainbel, many thanks for your response. Now, how to reverse engineer the spindle ... Hmmm :hmm1:

[fountainbel]

Fountainbel, many thanks for your response. Now, how to reverse engineer the spindle ... Hmmm :hmm1:

 

As Hari already suggested :

 

A brass lead spindle would be a solution....

 

Francis

[Rowbo]

I remember seeing one of these brass spindles in a photo somewhere in another thread some months ago. It was not commented on, as I recall. I have been looking for it ...

 

Francis - it occurred to me that it might be (or rather, probably is) one of your creations, so I wondered if it was you who had posted the photo ...

 

Now here's a thing. Does anyone else feel slightly uneasy about looking through another person's previous postings without being invited? Is it considered impolite? :embarrassed_smile: In the case of Fountainbel it is exceedingly informative and highly recommended!

 

Sadly, lack of time does not permit a thorough 'rummage'.

[fountainbel]

I remember seeing one of these brass spindles in a photo somewhere in another thread some months ago. It was not commented on, as I recall. I have been looking for it ...

 

Francis - it occurred to me that it might be (or rather, probably is) one of your creations, so I wondered if it was you who had posted the photo ...

 

Now here's a thing. Does anyone else feel slightly uneasy about looking through another person's previous postings without being invited? Is it considered impolite? :embarrassed_smile: In the case of Fountainbel it is exceedingly informative and highly recommended!

 

Sadly, lack of time does not permit a thorough 'rummage'.

 

 

Hi Rowbo,

I've posted on my prototype demonstrator piston filler (maybe a year ago.)

 

This pen was equipped with a brass lead screw I made.

 

See : https://www.fountainpennetwork.com/forum/index.php?/topic/176321-fountainbel-ftdemonstrator/page__hl__%2Bfountainbel+%2Bpiston+%2Bfiller

It looks the pictures on this posting are elimintaed, so here is a picture again ;

http://i62.photobucket.com/albums/h89/fountainbel/Fountg002Kopie.jpg

 

Is this the posting you referred to?

 

This pen will not go in production since I've designed my "bulk filler" a few months later.

 

The "bulk filler" is – at least in my (and the "testers") experience- superior to a piston filler. The bulk filler pen is also very maintenance friendly, and can be completely dis assembled in 5 minutes.

 

Major advantage being the fact that it can hold at least 50% more ink as a piston filler with the same barrel length.

 

The "L E pre-series" demonstrator version – made by CONID- will become available mid- April this year.

 

See : http://www.fountainp...filling-system/

 

Francis

Edited March 11, 2012 by fountainbel

[Ghost Plane]

FYI, SpeerBob who sells on here and eBay occasionally has spare bits for MBs in case anyone breaks anything they can't machine.

[Rowbo]

Fountainbel:

Is this the posting you referred to?

 

I regret, no. I recall it as showing fitted to a standard 146/149, side-by-side with a plastic one, but that was not the point of the photo, I think it was possibly showing differences in piston assemblies. Memory is something I forget with these days.

 

Love the new filler.