Monte Rosa Cracked Feed Question

[Mookli]

Greetings,

I have a Monte Rosa with broken feed collar.

Is this part available anywhere, or does this require a donor pen?

 

http://www.maryhatay.com/Mark/Fountain-Pens/Mixed-Pens/i-LxmBHT4/0/L/Broken-L.jpg

 

[piscov]

Than I know of, that part can only be found in a donor pen, but try Speerbob, he has lots of replacement parts from Montblanc and he is a really nice seller.

I believe that a 342, 032, 252 collar will fit there.

 

But why not machining one with hard rubber? It is not hard.

[Mookli]

But why not machining one with hard rubber? It is not hard.

 

That could almost be a pun !

 

Yes I was just thinking that.

Even though I was considering polycarbonate for its elasticity and strength.

I doubt the collar does much but hold the good parts together. If it is dimensionally correct it should work.

M

[piscov]

No pun intended Mookli!! It is really hard to do subtle humour in a language that is not your own and after some failed tries I gave up

 

It was really just a suggestion as I know you master the lathe very well and that is probably a 30min to 1 hour job ( i´m not fast), faster and cheaper than sourcing out a new one, and a lot more fun!!

 

I have never tried with Polycarbonate, but with hard rubber I have made one for a Pelikan 101N I have .The original ones were made in hard rubber and they are very robust and have some elasticity to accommodate the feed and nib.

 

If I am not mistaken the thread there should be 36TPI, but please check it first.

[hari317]

I would be interested to buy a few such sleeves.

[Mookli]

piscov,

I think I will use hard rubber, as they say, If it works, don't fix it.

 

 

Hari317,

I will let you know if I have extras.

Mark

[Mookli]

I carefully checked out the ferrule today and made a drawing

The original is a injection molded, my guess would be Acrylonitrile butadiene styrene. I successfully glued the Ferrule with methyl ethyl ketone, . The repair is only good enough for measuring the part, and it still should be replaced.

The center bore is a precise fit to the feed and a counter bore provides additional room for the nib and additionally controls the depth of the nib.

 

http://www.maryhatay.com/Mark/Fountain-Pens/Mixed-Pens/i-5sxmFTq/0/X2/Monte%20Rosa%20Ferrule-X2.jpg

[hari317]

I carefully checked out the ferrule today and made a drawing

The original is a injection molded, my guess would be Acrylonitrile butadiene styrene. I successfully glued the Ferrule with methyl ethyl ketone, . The repair is only good enough for measuring the part, and it still should be replaced.

The center bore is a precise fit to the feed and a counter bore provides additional room for the nib and additionally controls the depth of the nib.

 

 

wonderful. Thanks for sharing.

 

0.634 pitch is nearly equivalent to a 40TPI thread(0.635mm), ME (model engineer) range.

 

would a modern material like PEEK be better for making the new housing?

[Mookli]

wonderful. Thanks for sharing.

 

0.634 pitch is nearly equivalent to a 40TPI thread(0.635mm), ME (model engineer) range.

 

would a modern material like PEEK be better for making the new housing?

Yes, and actually I think a 1/4-40TPI die will work.

I will let you know, I have one coming in.

and Yes, if you had some peek laying around, it should work OK.

 

No mater what material you use, a little trial and error will be required to fine tune the final dimensions.

The critical feature being the friction fit between the feed, nib and Ferrule.

As you probably noticed I didn't tolerance my drawing. My plan is to go high on that number and lap in the last few thousands by hand.

Mark

[TLMG]

I think that you can easily make this with a tap, die, and lathe. Won't be a problem, frankly... just a bit more care is needed.

[Mookli]

I think that you can easily make this with a tap, die, and lathe. Won't be a problem, frankly... just a bit more care is needed.

You are absolutely right, the part is basic, you don't even need a die, it could be cut single point.

 

My only problem is, i make parts all day long and by quitting time I really don't want to spend more time in the shop!

Eventually I will come in on a Sunday and knock out a bunch of stuff I need.

[Mookli]

OK, I finally got around to making a few.

So yes, a acorn die will compress down far enough to cut a 6mm - 40Tpi thread.

I used black Delrin, a nice strong material.

I drilled the hole on the tight side and lapped in in for a good fit on the feed.

and all worked as planned.

 

Hari317 I have some extra as promised. PM me if still interested.

Mark

 

http://www.maryhatay.com/Mark/Fountain-Pens/Mixed-Pens/i-LhT3CnF/0/XL/IMG_7143-XL.jpg

[hari317]

wonderful job, sending you a PM.

[FredRydr]

Very cool. Monta Rosas will be saved from the indignant end in pen show dollar boxes!

 

Fred

[hari317]

[Fedor]

All good health! Dear Mookli, is it possible for me to purchase this item? I have exactly the same pen without the above-mentioned sleeve. I live in Russia.

Best regards, Fedor.

Edited November 8, 2017 by Fedor

[Mookli]

Fedor,

I am sorry to say I don't have any more at this time. If I make some again, I will let you know.

M

[nermash]

I must admit that I registered only to post on this thread

I have an old Monte Rosa 041 that my late aunt left me. It holds a great emotional value to me.

During last cleaning I overtightened the ferule with the nib and feed, and it cracked.

 

Dear Mookli, if you make any new sleeves, I would greatly appreciate if you could give me a chance to purchase one. Thanks for the great info in this thread!

[piscov]

I believe I have a few sleeves available. If anyone wants one Pm me, please.

[Spitbull]

I believe I have a few sleeves available. If anyone wants one Pm me, please.

Hi Piscov

I too have an afflicted Monte Rosa. Do you have any more ferrules? Please help.

Thx Bill

Edited December 18, 2018 by Spitbull