How to create a magnetic lock: Phase III: Winding the bobbin, not the core.

In the previous post. I mention how to make a 1 time use bobbin. Now I am going to do windings in the bobbin, insulate it and put it into the E core.

Remember that bobbin I made?

It has no holes, we(suppose to me my group mate and I but the uncle helped) have to drill 1 hole in the middle, so that we can attach it to the winding device.


Drill the bobbin using electrical driller.


It's very embarrassed that I didn't make the bobbin smooth enough, so I have to add a layer of plastic. If it happens to doing the same project, stupidly follow my previous instruction on doing the 1 time bobbin, you probably need to cover up the non-smooth surface like I did.


To avoid unwanted movement the device has to be stabilize.

I was dizzy busy learning from uncle Teng (below) that I forgot to capture some steps.

We poke holes in each edge(the model board is soft enough to be poke by needles, advantage of using model board) then have the needles to through it. 4 thread is now hanging on each edge.(I beg you can't understand, should have remember to take pictures). The intention is to tie the copper wires together tightly before taking the copper wire out from bobbin, so that It can remain in 1 piece plus remain the shape just like in the bobbin.

The winding device counts how much winding is currently hold. In this magnetic lock project, more winding is better, but the number of windings does not change the magnetic field of the core. The magnetic field is inversely proportional to the core's/winding's length. Will explain more on the calculation phase.

Then, the copper wire is insulated by tapes. Do not tape the threads in. Remove the thread on each section before rolling it with insulator aka tapes. After insulating the whole windings, and removing the threads, put the copper winding into the E core.


You may test your magnetic core now.
I supply 6 V of DC, as to remain 0.5A of current in the circuit.(If you supply more current rating than the copper wire can take up, it will over heat may explode burn)
I will show and explain more on the calculation in next few post.

You may also interested in:

-How to create a magnetic lock: Phase I: Research

-How to create a magnetic lock: Phase I: Ask Professionals

-How to create a magnetic lock: Phase I : Try and error

-How to create a magnetic lock: Phase II: Buy materials

-How to create a magnetic lock: Phase III: E core's Bobbin

-How to create a magnetic lock: Phase III: Winding the bobbin, not the core

-How to create a magnetic lock: Phase IV: Housing

DiGi iPhone 4 Me!!!!!

Remember I said my phone pass away and revived the other day?
Well, my SE G900 has follow me for more than 1 year.

Maybe I just not very good in taking care of her. She got scratches and wounds all over her lovely red body





I didn't dump her for all this reasons.

I was pissed by her attitude.
She become slower and slower everyday.
This lil old lady gets lag when I open a few application at the same time, not to mention the worst nightmare.

Restart phone!!!



However, I still keep her though she always put on a show of bad temper,coz

Notice what I wanna tell?

Not the Red table cloth lah!

It's the yellow Sim card.


Thats right! Digi, always the Smartest Choice!

I didn't change any phone yet because I am attach to the Digi D'campus plan.
All other smart phone have to subscribe to data plan, else not internet=no smart phone :/
I even did a blog post about the D'campus plan because I was so in love with it that time.


Don't worry neither Digi nor Nuffnang bribe me to do so.

It's funny that a red devil like me didn't took up the hotlink red plan but choose the yellow man instead.
Digi is one and only Telco service provider since I own my first phone.
I did wanted to change to a BB when my SE G900 passed away and before revived.
However, the data plan pulls me back.

Now, instead of paying a huge amount for a new phone, I can have a new iPhone 4 with lower rate of post paid plan! Isn't that great?!

It's like having a cheaper data plan plus after purchasing a brand new phone

OMG!!! Isn't that cool?

iPhone 4!!!




Muacks!!! I lover Digi 4evar!!!!!!!!!

Courtesy to Nuffnang and Digi, one lucky winner will get this iPhone 4!!!
so~~~


Please?

How to create a magnetic lock: Phase III: E core's Bobbin

Remember the E core I shown you on previous post?

According to the Uncle that teach me to do winding, we can't do the winding in the core. We must first make a bobbin, do the winding in the bobbin, then only take out the winding and put it into the core.
Note that, bobbin are usually made by plastics or woods. The model that I show here is not the common way of making a bobbin. This is a self impress creative babe's idea to do a one time bobbin. If it happens to be very useful, don't forget to let me know.


First design the measurement that we wanted. Some place must the slightly longer and some place must be slightly smaller so that the winding can still fit in the core after the winding is coated with insulated.

I use Model board to do it. Sort of recycle item.


Then, use white glue to attach them together.


I compress the glued model board so as to minimize the space/length take up by glue when it stack up.

This is how to bobbin looks like. I did 4 sets, but I only manage to finish 1 winding. Will take about that later on the next post.

You may also interested in:

-How to create a magnetic lock: Phase I: Research

-How to create a magnetic lock: Phase I: Ask Professionals

-How to create a magnetic lock: Phase I : Try and error

-How to create a magnetic lock: Phase II: Buy materials

-How to create a magnetic lock: Phase III: E core's Bobbin

-How to create a magnetic lock: Phase III: Winding the bobbin, not the core.

-How to create a magnetic lock: Phase IV: Housing

How to create a magnetic lock: Phase II: Buy materials

After going to a few wrong turn, I finally make my mind to burn cores instead of trying to get free core from junk which is impossible which also testify the idioms: No free lunch.
So, I go to this transformer which was told by the uncle in few previous post.

This is the only transformer shop that I can find in Jalan Pasar, KL.
Address:
No1, Jalan Beruang,
Off Jalan Pasar,
Pudu, 55100,
Kuala Lumpur
03-2213533
03-2233163

(in case you don't know, Jalan Pasar in so call the electronic 1 stop center in KL)


This is it, this is the E core I kept mentioning in my MSN.
The core's shape looks just like an capital letter E.


I bought 9 sets of them. RM35 per set of 1.31cm.
Should have get 11.7cm, but they gave we 14cm.
Well, the more the better (thought I am not gonna use so much anyway).

Other than core, I will also need some copper wires. The Insulated one, but not those for house wiring.

Got confuse but all the numbers and measurement, so just simply pick one.
As long as not so thick and not so thin (later I found that it's a very wrong decision to simply pick the diameter)

Bought 1 kg or them.
I also can't imagine how much I need so I just bought the smallest portion possible.
(Later on I regret, coz I think I just use less than 2 % of the whole role)
I got some left out after the project, wanna sell it to other group that doing different title.
Took a picture of the wires. They taught the bobbin is as small as a thread.
Let me show you the really size



Are you gonna call him tiny again?

You may also interested in:

-How to create a magnetic lock: Phase I: Research

-How to create a magnetic lock: Phase I: Ask Professionals

-How to create a magnetic lock: Phase I : Try and error

-How to create a magnetic lock: Phase II: Buy materials

-How to create a magnetic lock: Phase III: E core's Bobbin

-How to create a magnetic lock: Phase III: Winding the bobbin, not the core.

-How to create a magnetic lock: Phase IV: Housing

How to create a magnetic lock: Phase I : Try and error

After getting advice from my junior's father, where he advice me to get the E core from some old unwanted transformers.

This is the one I get from the junk store opposite to my house.



And get some others from my dad and brother's friends.

After trying to dissect them, this is the result:

creats a mess and get nothing.

Then, I ask my dad to help. After a few knocking, he gave up and said:
"How could this possibly be open?! It's glue together. "

Leaving me with my confuse face.

What the ~~~~
Shouldn't you make a mess and trash at least 1/2 of what I created before giving up?
Oh God. I can't think of anything worst than this.
That leaves me no choice but to buy a set of brand new core.
P/S: If you are doing what I'm doing, you can definitely skip this phase.

You may also interested in:

-How to create a magnetic lock: Phase I: Research

-How to create a magnetic lock: Phase I: Ask Professionals

-How to create a magnetic lock: Phase I : Try and error

-How to create a magnetic lock: Phase II: Buy materials

-How to create a magnetic lock: Phase III: E core's Bobbin

-How to create a magnetic lock: Phase III: Winding the bobbin, not the core.

-How to create a magnetic lock: Phase IV: Housing

New Moon Cake Flavour: Moldy Moon Cake

Moon cake these days are so fancy. From classical lotus paste and nuts to chocolates and fruits, not to mention Jelly moon cake is my current favorite.
Past few years there was this big ass company introduced some fancy little Sakura flavor moon cake that cost an ass. They brought the Sakura leaves and flowers fresh from Japan.
How knows, this year a "new" flavor introduced. It's the snow Japan Winter snow flakes flavor.

o^^0 Yay!!!

Woops!

What is that?!

A closer look:



It's a moldy Moon cake.
It is not expired yet (refer picture 1)

My parent has a nibble on the other side. When my brother pick his nibble, then only my parents realise it is moldy.

Luckily the sales person willing to exchange a new 1 for us.
P/s: the moon cake is from Six Happiness.

Home made Absolut Vodka

Have you ever try a purple version of Absolut Vodka?

I have one with me ^^
Hehehe... home made nia


The "wine"(enzyme @ 酵素 @ こうそ ) is made from Dragon fruit and lemon.


The process to refining the "wine"


Some how I know you wouldn't wanna try.

Few years back, I read an article about how to make strawberry wine. The process is just the same, that my mom is now using dragon fruit and lemon instead of strawberries. I wounder Muslim can consume this? >.<

How to create a magnetic lock: Phase I: Ask Professionals

From the last post, since I am limited source and information, I found out that one of my junior's parents is having a electronic repair shop in Kepong. They can do windings for me. Thus, I try my luck and visited them yesterday. Well, I should say it is not a smooth one. When I reach Kepong, it rains heavily. I am not familiar with Kepong and still tailing my junior's car. However, we still reach the destination.
When we (my groupmate and I) reach there, his dad took out some copper wire and a mechine to do winding.

Machine to make windings


Copper wires with different diameters

However, this 2 thing is not helpful since my knowledge towards the subject is not correct. The ferromagnetic core that I get from my senior can't be use because as told by the uncle, a ferromagnetic core is suitable on high frequency AC transformer but not on DC device.

Well, guess I have to start all over again.
He suggested me to find some old transformer to get the E shape core.
The cons is that the transformer is very hard to dissemble (dissect).


Sigh... the project just getting more complicated

You may also interested in:

-How to create a magnetic lock: Phase I: Research

-How to create a magnetic lock: Phase I: Ask Professionals

-How to create a magnetic lock: Phase I : Try and error

-How to create a magnetic lock: Phase II: Buy materials

-How to create a magnetic lock: Phase III: E core's Bobbin

-How to create a magnetic lock: Phase III: Winding the bobbin, not the core.

-How to create a magnetic lock: Phase IV: Housing

How to create a magnetic lock: Phase I: Research

Been a long time not writing anything about my projects and assignment. I have done a few quite interesting project, but not yet post it here. This magnetic lock project is what I am currently working on.

Well, basically, This is how the commercial magnetic lock looks like.

From what I know, this kind of device usually takes in DC. Some device might work on Ac too but of course, the strength is lesser.

I'm gonna do one just like it, but try not to look very similar.
I am not improving the lock, but just for the sake of learning and completing assignment.

I dissect a lock. The internal core and winding looks like this:

It has a E shape metal core and insulator around it. With my dad's help I manage to tore the insulator down.


Shockingly, not as what I expect, it's not a bar nor a circular ring that we usually see or not even the U shape core that theoretical so call strongest. Note that the ends of the "E" is not insulated, it is open to the surrounding, not in the core. When the the device turns on, the ends of the "E" attracts metals which we call it electromagnet.



It's quite lengthy and bulky.


On the other hand, lets look on the metal plate that attach the the door which later the electromagnet attracts. I assume the plates should be very thick else when the switch is on, the magnetic is pull by a human force, if the metal plate can't withstand the force, it will bend.
I hope I can find something similar to this in scrap metal dumping field.


A senior of mine gave me these. It's ferromagnetic core. According to him, it's the core that makes transformers.


Hmmm... I hope this could be useful.

I'm bring this material to find my junior's dad which is a professional in transformer. Hope he can help me to do some winding or at least give me some advice on the theory part of the project .
Wish me luck!

You may also interested in:

-How to create a magnetic lock: Phase I: Research

-How to create a magnetic lock: Phase I: Ask Professionals

-How to create a magnetic lock: Phase I : Try and error

-How to create a magnetic lock: Phase II: Buy materials

-How to create a magnetic lock: Phase III: E core's Bobbin

-How to create a magnetic lock: Phase III: Winding the bobbin, not the core.

-How to create a magnetic lock: Phase IV: Housing