Pelikan 800 nib unit thread spec's

[fountainbel]

Can one of you Pelikan adepts please confirm the fixation thread of an M800 nib unit ?

I made me an OS demonstrator plunger filler, being a tribute to the plunger filler of the golden era ( see "pen making & turning" forum)

The Pelikan 800 nib unit looks just the size I need

According my measurements it looks an M8 x 0.7 mm, but this is not a standard size ( M8x 0.75 is)

Is is really an M8x0.7mm thread, and if yes, any idea were I can buy a tap ( and die)?

Thanks in advance for you help !

Francis

[Jarno]

Hello Francis,

 

If you like I can double check the thread dimensions on one of the Nikon profile projectors we have overhere. It'll have to wait till monday though, because I didn't bring the big Pelikan (805) to work today.

As to the required tap, I will check if we have a good address for these. Our modelshop used to do a lot of special stuff, and they have some weird and wonderful reamers and taps lying around.

Have you got pictures of your pen, I'm especially interested to see how you did the piston mechanism (can you tell I'm a mechanical engineer?). One of these days I'll design a new mechanism for my Tibaldi (alu cylinder and piston). Anyone want to donate their defective Tibaldi to help me experiment?

 

Edit: I have seen the pen, it looks great! Really interested in the drawings! This surely makes me want to "roll my own".

 

Best regards,

 

Jarno.

Edited March 7, 2008 by Jarno

[Rapt]

Been considering "rolling my own" as it were also.

 

Potentially with an eye to putting it into production if its viable, I've always thought the Pelikan nibs were the way to go.

[Jarno]

If the thread size is indeed M8x0,7, I haven't been able to find taps on my short google search. I'll check with our modelshop on monday.

Apparently the thread size does exist, because there is a company in Schwitzerland which uses it for magnetic sensors (www.olitronic.ch). With each of these sensors, two nuts are used to fasten it.

A "hack" solution could be to turn these nuts on the lathe to the smallest diameter you're comfortable with, and then glue these in. I think you'd still need about 9,5mm ID, perhaps this is not feasible.

 

Starting to look like a thread for the pen turning and making, right (although I rarely check these fora)? Moderators?

 

Best regards,

 

Jarno Verhoeven.

 

Edit:

RAPT, we could design the "guts" of the pen together so we can each incorporate them in our own pens.

Edited March 7, 2008 by Jarno

[Rapt]

RAPT, we could design the "guts" of the pen together so we can each incorporate them in our own pens.

 

Certainly sounds like a possibility. It'd be good to have a common design to reduce costs of production.

[SMG]

Francis, why use a tap and die? I would prefer a single point tool and turn the thread in, you will end up with a much more precise thread if you have a lathe.

 

Cheers,

 

Sean

[fountainbel]

Thanks for the confirmation on the thread spec's Jarno & Rapt, I'll try to localize a vendor & keep you informed.

Sean, I see cutting the thread with a single point tool as my "fall back" solution.

Given the bore diameter is only 7.4 mm, the thread is starting approximately 3mm in the bore & there is no groove at the end were the thread ends, I prefer using a tap diameter.

Francis

[Jarno]

That's a rather small tool, although it _is_ just plastic you're turning. Not sure about the statement of the more accurate thread though, me thinks there's a lot more to go wrong than with a plain old tap (mainly tool geometry).

 

Regards,

 

Jarno.

 

[SMG]

Don't take my word for it, email David Broadwell and see what he says. A cut thread will exhibit better geometry every time than a tapped thread, especially in plastic of thin wall construction. The plastic deformation which happens due to cutting forces distorts the plastic and is greater if there is more than one cutting edge. With a single point tool, there is only 1 cutting edge and thus less deformation. Additionally taps tend to tear plastic rather than cut it so the thread flanks are less smooth.

 

I understand what Francis is saying, there is not alot of room to get a tool in there. But that would be the best way in my opinon to do it. To each his own.

 

Cheers,

Sean

[fountainbel]

Note that polycarbonate is a rather hard plastic.

Ive used taps & dies for the section & barrel fit , they fit without any backlash, are fully transparent & smooth as a baby bottom.

As you say Sean ,each is own way, I prefer taps & dies.

Francis

[Rapt]

We want pics when its done!

[Jarno]

My experience is mainly in metalworking, but for plastic I can imagine that having one very sharp tool leads to lower deformation and better cutting, thus better threads, good point.

 

Regards,

 

Jarno.

 

 

Don't take my word for it, email David Broadwell and see what he says. A cut thread will exhibit better geometry every time than a tapped thread, especially in plastic of thin wall construction. The plastic deformation which happens due to cutting forces distorts the plastic and is greater if there is more than one cutting edge. With a single point tool, there is only 1 cutting edge and thus less deformation. Additionally taps tend to tear plastic rather than cut it so the thread flanks are less smooth.

 

I understand what Francis is saying, there is not alot of room to get a tool in there. But that would be the best way in my opinon to do it. To each his own.

 

Cheers,

Sean

 

[fountainbel]

Contrary to what one should expect from a German company, it looks Pelikan uses inch treading on their nib assemblies.

According my latest measurements the Pelikan "screw-in" nib assemblies feature the following thread spec's:

9/32"- 36TPI M400/600 Pelikan nib

11/32"-36TPI M800/1000 Pelikan nib.

I contacted Pelikan asking them if I could install their nibs in my "PF Tribute"pen, unfortunately the answer was negative.

Consequently I did not make the female threads to check if they fit properly, although I'm 99% sure they will.

I decided to use Bock nib assemblies.

Francis

 

 

 

 

Can one of you Pelikan adepts please confirm the fixation thread of an M800 nib unit ?

I made me an OS demonstrator plunger filler, being a tribute to the plunger filler of the golden era ( see "pen making & turning" forum)

The Pelikan 800 nib unit looks just the size I need

According my measurements it looks an M8 x 0.7 mm, but this is not a standard size ( M8x 0.75 is)

Is is really an M8x0.7mm thread, and if yes, any idea were I can buy a tap ( and die)?

Thanks in advance for you help !

Francis

 

[Rapt]

Contrary to what one should expect from a German company, it looks Pelikan uses inch treading on their nib assemblies.

According my latest measurements the Pelikan "screw-in" nib assemblies feature the following thread spec's:

9/32"- 36TPI M400/600 Pelikan nib

11/32"-36TPI M800/1000 Pelikan nib.

I contacted Pelikan asking them if I could install their nibs in my "PF Tribute"pen, unfortunately the answer was negative.

Consequently I did not make the female threads to check if they fit properly, although I'm 99% sure they will.

I decided to use Bock nib assemblies.

Francis

 

Thanks for the update... I'm not sure how they can dictate what you do with a nib once you buy it. If I want to smoke it or insert it in my car how can they prohibit that? I'd talk to a lawyer...

[Dr.Grace]

You could always let the purchaser acquire a Pelikan nib separately (maybe even from you), as they're readily available.

[Rapt]

You could always let the purchaser acquire a Pelikan nib separately (maybe even from you), as they're readily available.

Another good option.

[Gretchen]

Taps for the 9/32 36TPI threads???

Has anyone come upon a source for these? I don't have a lathe, but I do have a tap wrench, and would like to add some threads to the existing ones in some sections to allow them to take other threaded nib units that have the same size, but put their threads in different places. (Hope that makes sense!) For example, I've got a gorgeous italic nib that will thread into both Esterbrooks and smaller Pelicans, but because it has almost triple the length of threads, and its threads are very low on the unity, it doesn't go in far enough.

Thanks for any suggestions.

Gretchen

[Bill D]

Taps for the 9/32 36TPI threads???

Has anyone come upon a source for these? I don't have a lathe, but I do have a tap wrench, and would like to add some threads to the existing ones in some sections to allow them to take other threaded nib units that have the same size, but put their threads in different places. (Hope that makes sense!) For example, I've got a gorgeous italic nib that will thread into both Esterbrooks and smaller Pelicans, but because it has almost triple the length of threads, and its threads are very low on the unity, it doesn't go in far enough.

Thanks for any suggestions.

Gretchen

 

Hi Gretchen,

 

You might also want to ask about this over in the Pen Turning and Making forum. This sounds like an interesting project. Please keep us filled in about how it goes.

 

Bill

[Gretchen]

Will do, thank you for the suggestion!

Gretchen

 

[fountainbel]

Correction on the thread spec's of the M1000 nib unit.

The threads for the different versions are :

9/32"- 36TPI M400/600 Pelikan nib unit

11/32"-36TPI M800 Pelikan nib unit.

3/8"- 36TPI M1000 Pelikan unit.

 

5 bottoming taps, each for M400/600 & M800 are actually being on order. I will keep 2 of each & sell the others.

Cost will be around $ 64.00/tap, registered shipping is $12.00

Please contact me when interested.

Francis

 

 

 

Contrary to what one should expect from a German company, it looks Pelikan uses inch treading on their nib assemblies.

According my latest measurements the Pelikan "screw-in" nib assemblies feature the following thread spec's:

9/32"- 36TPI M400/600 Pelikan nib

11/32"-36TPI M800/1000 Pelikan nib.

I contacted Pelikan asking them if I could install their nibs in my "PF Tribute"pen, unfortunately the answer was negative.

Consequently I did not make the female threads to check if they fit properly, although I'm 99% sure they will.

I decided to use Bock nib assemblies.

Francis

 

 

 

 

Can one of you Pelikan adepts please confirm the fixation thread of an M800 nib unit ?

I made me an OS demonstrator plunger filler, being a tribute to the plunger filler of the golden era ( see "pen making & turning" forum)

The Pelikan 800 nib unit looks just the size I need

According my measurements it looks an M8 x 0.7 mm, but this is not a standard size ( M8x 0.75 is)

Is is really an M8x0.7mm thread, and if yes, any idea were I can buy a tap ( and die)?

Thanks in advance for you help !

Francis