Shearing my method for capring "swaging"

[fountainbel]

Thanks for the compliment Gerry, I surely understood it as such!

 

 

I meant it as a compliment to Francis, and I'm sure it was understood that way. The common meaning is professional, reliable, competent. If you prefer narrowness, suit yourself.

Gerry

[penboard.de]

Hi Doug,

The workpiece ( the loose cap ring) is forced through a confining die ( the steel band in the collet in our case ) to reduce its diameter.

In fact the process is a sort of controlled shrinking, in which -at least theoretically - the thickness of the cap ring will somewhat increase, since its material volume remains equal.

In our situation - the cap band being very thin - there are surely limitations to this "shrinking"

Loose cap rings mostly only need a diameter reduction around 0.1- 0.2 mm to "settle" back firmly in the cap groove.

This will normally work fine, since the ring will contact its back-up surface- the cap groove - before loosing its cylindrical form I expect however a 0.4 mm diameter reduction will be problematic, since the ring would bend inwards & deform before contacting the cap groove.

I hope this clarifies the process a little.

Regards, Francis

 

<!--quoteo(post=663739:date=Jul 8 2008, 04:38 PM:name=Douglas)--><div class='quotetop'>QUOTE(Douglas @ Jul 8 2008, 04:38 PM) 663739[/snapback]</div><div class='quotemain'><!--quotec-->Francis,

 

Can you explain in layman's terms how the swager works? I've never understood how swaging makes a solid ring of metal shrink in diameter. thanks, doug<!--QuoteEnd--></div><!--QuoteEEnd-->

 

thanks, dear Francis, for sharing what most of the pen guys keep as their secrets... about shrinking vintage rings - when I find a too loose cap ring, freely dancing above the groove, I give him a first go on the cap right besides the groove, if its sitting tight there, you can push it over the goove and give him the final touch.

 

About shrinking tiny cap bands - before knowing the clutch trick, I went to see a tool maker, showed off the grooves and the rings and asked for a tool made. He would not believe the rings were to be shrunk. The tool maker proposed I try some type of glue. :-)

 

But then he correctly refused to make a tool, instead told me to take a set of ER32 or ER25 ...

 

Regards

Tom

[penboard.de]

Hello again,

 

here is the vintage tool, I found years ago.

it now takes the old inserts as well as new ones taken from a set of ER32

 

 

Best regards

Tom

[Donna]

Nice improvement on cap ring swaging...thank you

 

Francis is always very helpful especially when a few years ago

 

'repairers secrets' were only kept to themselves selfishly except

 

our Belgium friend.

 

 

[sztainbok]

Francis. I have a cap with very loose rings that can actually come out of the cap. My question is how to make sure that the ring gets inserted in the groove all around and doesn't end up with parts of it tight against the cap outside the groove.

Thank you,

Victor.

[fountainbel]

Hi Victor,

In this case you should first swage the ring on the outer cap diameter ( i.e. besides the groove), as Tom already suggested in his response.

When the ring sits tight there, you slide it in the groove and swage again till it sits tight in the groove.

Wishing you success !

Francis

Francis. I have a cap with very loose rings that can actually come out of the cap. My question is how to make sure that the ring gets inserted in the groove all around and doesn't end up with parts of it tight against the cap outside the groove.

Thank you,

Victor.

[sztainbok]

Thank you Francis.

Victor.

[fountainbel]

Hi all,

Attached a picture showing my improved swaging set-up, which I've already sheared with a few of you.

Instead of using a shim-plate strip inside of the collet. I now use intermediate bushings- sleeves - made in a hard though plastic, being "Ketron Peek ".

The shim-plate strip I've used initially still created the riks of unwanted deformation of the cap ring at the overlap of the shim.

Using the intermediate Peek bushings this risk is completely eliminated.

There is no need at all to slit the rings, the material allows enough radial deformation during swaging, and returns promptly to its initial larger diameter if made within the dimensions specified on the attached sketch.

The outer diameter "D" of the bushing is made just sliding in diameter of the collet.

While the inner diameter "d" should best be 0.1-0.2 mm larger as the un-swaged ring.

Wall thickness of the Peek rings being in between 0.3 and 0.7mm.

Using a wall thickness below 0.3mm one risks the material will enter the lengthwise collet slots during swaging , using a wall thickness over 0.7mm radial deformation forces become rather high.

Only drawback of this approach is the fact that one needs to make a range of different bushings/sleeves, hence a lathe is needed…

Note using rings made of POM ( Delrin) ring may work, but risks are high the soft Delrin will protrude in the lengthwise slots of the collet during swaging hence permanently reduce the diameter of the sleeve.

Hope this helps !

Best regards,

Francis

http://i62.photobucket.com/albums/h89/fountainbel/Repair%20suggestions%20to%20forum/P1010303.jpg

[che63]

Any chance someone still has this jpg.  the link doesn't work.  thanks. Arron.

[che63]

Francis was kind enough to email me the jpg and asked that I post it, so here it is.

[che63]

If anyone has the ability to make these sleeves, I would happily pay for a set.  Please send me a message and we can talk price.  Thank you.  Arron.

[FarmBoy]

It isn’t a set. You need make a “set” for each cap you encounter. Diameter in a few steps does and width to match the band. 
 

I often make them a just use once and relegate them to the tray to be recut later. 
 

You also want a mandrel to support the cap. 

[fountainbel]

Here a picture of my final swaging approach

[ChristianEl]

Amazing, Thank you so much @fountainbel! Is there a way of making this Peek sleeves without professional equipment?

[ChristianEl]

And one more question: What does the varying wall thickness of 0,3–0,7mm depend on, which sleeves have which wall thickness? Thank you very much!

[hari317]

How are the Omas 360 cap rings swaged? Triangular instead of a circle. 

[FarmBoy]

8 hours ago, hari317 said:

How are the Omas 360 cap rings swaged? Triangular instead of a circle. 

Same way but with a triangular die.

[fountainbel]

On 2/21/2024 at 2:51 PM, ChristianEl said:

And one more question: What does the varying wall thickness of 0,3–0,7mm depend on, which sleeves have which wall thickness? Thank you very much!

One has to compromise between the diameter of the diameter of the ring (which  has to be swaged ) and the standard bore diameter of the tool.