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Old 23rd March 2014, 03:18 PM   #11
popilin is offline popilin  Argentina
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Tip#1 The winding lathe

Almost anything that spins, a drill with variable speed, or the mom's old sewing machine.

You have to put a screw and tightened with nuts and washers two pieces of wood to hold the bobbin.

To count the turns of wire, place a small magnet on the part that rotates, on the fix part, a reed switch connected with the "=" key on a cheap calculator, type "1" and "+" and each time the magnet pass over the reed switch it be counted a turn.
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Old 23rd March 2014, 04:28 PM   #12
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I prefer my Bobifil winder

Nice document you made.

Quote:
Originally Posted by popilin View Post
Tip#1 The winding lathe

Almost anything that spins, a drill with variable speed, or the mom's old sewing machine.

You have to put a screw and tightened with nuts and washers two pieces of wood to hold the bobbin.

To count the turns of wire, place a small magnet on the part that rotates, on the fix part, a reed switch connected with the "=" key on a cheap calculator, type "1" and "+" and each time the magnet pass over the reed switch it be counted a turn.
 
Old 23rd March 2014, 04:41 PM   #13
popilin is offline popilin  Argentina
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Hi Martin
Good to see you around here.

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Originally Posted by esltransformer View Post
I prefer my Bobifil winder
Of course, if you already have a winding machine, things are a lot easier.

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Originally Posted by esltransformer View Post
Nice document you made.
Thank you very much !
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Old 23rd March 2014, 05:16 PM   #14
kevinkr is offline kevinkr  United States
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Font size of first two posts reduced due to complaints about the size.
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Old 23rd March 2014, 05:34 PM   #15
popilin is offline popilin  Argentina
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Tip#2 How to start a winding

For me it is the hardest part, we start by straightening the wire making it a little run through your fingers without exerting too much pressure.
Then we wrap the wire with tape type "Scotch" as shown in fig 1, and then put the wire over the tape so it is snug, and we can continue winding.
Every few more turns, with a soft plastic spatula, we press the wire so that they are as together as possible.
Attached Files
File Type: pdf FIG1.pdf (149.5 KB, 87 views)
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Old 23rd March 2014, 05:55 PM   #16
Mooly is offline Mooly  United Kingdom
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I've tidied this up somewhat and deleted posts that were straying and starting to get personal.

Stick to the topic in hand folks, and let the only winding be on your transformers, not winding up each other.
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Old 23rd March 2014, 07:09 PM   #17
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You need something like this:
Click the image to open in full size.
Quote:
Originally Posted by popilin View Post
Tip#2 How to start a winding

Click the image to open in full size.


For me it is the hardest part, we start by straightening the wire making it a little run through your fingers without exerting too much pressure.
Then we wrap the wire with tape type "Scotch" as shown in fig 1, and then put the wire over the tape so it is snug, and we can continue winding.
Every few more turns, with a soft plastic spatula, we press the wire so that they are as together as possible.
 
Old 23rd March 2014, 07:24 PM   #18
popilin is offline popilin  Argentina
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Hey, that's not fair, you are a professional, and your transformers are amazing!

Here we have a saying "It is counting money in front of the poor"
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Old 23rd March 2014, 07:31 PM   #19
popilin is offline popilin  Argentina
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Tip#3 Interlayer insulation

Modern magnet wire has a breakdown voltage of more than 4 KV, so no need a great insulator, unless you make a very high voltage transformer.
However there are two more reasons for use insulation between layers

1- Decrease mechanical stress between layers

2- Decrease interlayer capacitance

One or two layers of 0.05mm polyester would be enough.
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Old 23rd March 2014, 07:42 PM   #20
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Small correction, I am not a professional. I do this for a hobby and i have just a normal job at daylight



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Hey, that's not fair, you are a professional, and your transformers are amazing!

Here we have a saying "It is counting money in front of the poor"
 

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