Kitless pen with magnetic cap

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AbleSnail

AbleSnail

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Hey,
do you have any proven solutions for a kitless pen with a magnetic cap? I will gladly preview your ideas and projects.
greetings
Grzesiek from AbleSnail
 
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I did one a few years ago....... you can see the thread here. The magnetic cap design is really simple. One in the cap and one on the body. They basically just replace the threads.
1590493129446.png
 
skiprat said:
I did one a few years ago....... you can see the thread here. The magnetic cap design is really simple. One in the cap and one on the body. They basically just replace the threads.
View attachment 239701
Click to expand...
What type of magnet cause i am assuming you need to turn it to the proper shape and size so you can install it onto the pen cap and body. Where can I get them. I am in Europe so where you get them i am sure i can get also. Thanks skiprat
 

An 'Attractive' White Ti affair

I was gonna call it 'Magnetic DCE Al SS Ti PR Sementation' but that was a bit of a mouthful !!:rolleyes: This has titanium segmented with white pr. There are small neodymium ring magnets recessed into both the cap and the body. The nib is stainless steel which is screwed into an aluminium...
www.penturners.org

supermagnetman.com

Ring Magnets

Strong Neodymium ring magnets, versatile and allow for smaller designs They work well as speaker magnets, holding magnets, and more. We can make custom sizes
supermagnetman.com supermagnetman.com
 
Just for the record..... for this pen, I completely worked around the dimensions of the magnets. After discovering just how brittle magnets are, I made no attempt to machine or bore them at all.
good luck. Let us know how you get on.
 
Completely true Dan, but I think using just one magnet can make your design quite complex. You need the cap to 'pull' the parts together .
I also found that the damned magnets would pick up crap from everywhere. ;)
 
skiprat said:
Completely true Dan, but I think using just one magnet can make your design quite complex. You need the cap to 'pull' the parts together .
I also found that the damned magnets would pick up crap from everywhere. ;)
Click to expand...

I was going to try one a while back and got some 440c SS rod but never got around to it. I thought of making a ring on the body with a magnet in the cap.


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That would work of course, and sounds simple and logical.....provided the nib / grip section isn't also ferric.
 
The magnetic system (magnet and ferritic pieces) will seek a state with the least "reluctance". Reluctance is sort of the magnetic term for resistance (if you think of it like an electric circuit). So magnets and ferritic materials have low reluctance and the air obviously has high reluctance.

So if your nib/section is ferritic, the magnet may try to center itself on the section instead of pulling up against the metal in the body.

It's all about minimizing the magnetic potential in the system, so if you can set it up to have one clear magnetic circuit then it will hold together well. If the whole body is metal that may make it the easiest to design a magnetic circuit that holds the cap on. With acrylic parts you should sketch out where all the magnetic and paramagnetic (ferritic) pieces are to see the path that the magnetic flux will take to complete its circuit.

-Hank


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