Guru
Joined: 22/10/2019
Location: AustraliaPosts: 955
| Posted: 09:39am 28 Feb 2021 |
Okay ... for those of you wondering if I've given up or not!!!
I'll upload some photos, that'll save some typing
I've taken the lead from Klaus and 'frackers' and am using a hoop through the core rather than small reels.
First photo is of some tools I made to help with the winding.
The one on the left is shaped so it sits in the slot of the hoop to help open it, plus push the wire around as I load the hoop. Works great, I seemed to have fluked the shape so it stays in the slot and I just push the wire around and into the hoop which closes up behind it.
The middle tool has a small roller on the end so I can roll the windings into place if they are raised too high for when I wasn't careful enough ... and the last one is just a poker/push stick for shaping the windings and getting them closer together.
They're all made out of an old plastic cutting board I've used in the workshop for 20 years or so.
The hoop is an old kids hula hoop which I slit using a plastic cutting disc in my Dremel. The hoop has an OD of about 19mm ... and I am surprised just how much wire can fit inside.
Using some 1.7mm wire from an old 3kW AeroSharp toroid which was 52mtrs long ... all of it wound easily inside the hoop. I have no doubt I could get at least another 50 mtrs inside it if I needed to.
It is 670mm diameter ... so 2.1mtrs of wire per turn
Here I'm loading the hoop with the 52mtrs.
This will be the first winding on my #4 transformer ... 2 windings of 169 turns.
Not sure why the site is rotating my pictures. Anyone know how to fix that?
edit:
Mmmm ... and I've tried to add more photos to this post and an additional post ... but the images won't show at all.
Edited 2021-02-28 20:40 by rogerdw