Time for a new Warpinverter build

Author	Message
rogerdw Guru Joined: 22/10/2019 Location: Australia Posts: 955	Posted: 10:24am 01 Mar 2021       Thanks for the compliments Haxby and Murph, that is very encouraging.   Quote   I see you did not use a rounded cheek spacers on the cores,  perhaps that is the reason your fingers are sore    . I did not use any gloves nor masking tape on the fingers  . I was only planning on using the rounded cheek spacers on the largest #1 transformer, where I'll be fitting a 5mm spacer between the core and the first winding  ...  though now I can see it probably would have been worthwhile doing it for all of them. ...  plus I'm a bit of a softy just doing technical work all the time with rarely any hard physical stuff. Maybe this'll at least toughen up my fingers.     Quote   Re doing it standing up, you would not even consider it if you had my bad back. I used one of those B&D workbenches which was just the right sitting height, it even had a foot rest. Sorry to hear you have back troubles, that would certainly take the fun out of it. I did play around with different ideas, but being pretty tall I find it hard seeing underneath and then up and over the top  ...  so I'll persevere with the standing method. I suppose it's no different to all those in the gym doing all sorts of exercises  ...  at least I can see something for my efforts.     Quote   Good idea that hoop support with your big hula hoop, my smaller hoop was OK without that refinement. You might remember seeing a picture of that split PVC tubing I hammered into the hole after each layer but before applying the mylar. The PVC outside was waxed, the epoxy I poured down there securely locked the layer in place while it was pressed against the hole. This allowed only one layer per day but I think was very worth while. My toroid transformers are very quiet, the only hum comes from the choke if the two halves are not clamped very very tight. Yeah, I was really pleased how the hoop stand worked out. Early in the planning I was thinking about all sorts of complicated ideas of supporting it with rollers and all that stuff  ...  but the way its turned out, I can still hold the wire taut with one hand and easily spin the hoop around with the other. I do recall seeing your method for keeping the inner windings tight, which is an excellent idea  ...  especially when loading the epoxy and keeping that to a minimum. I did have a discussion earlier in this thread with Tony about using epoxy or not  ...  and I decided to go without. That may turn around and bite me on the butt  ...  but I'm willing to take a chance. It's another reason my fingers are copping a hammering because I'm making a really concerted effort to keep it tight all the way around and not letting up anywhere. The inverter will be housed in my shed adjacent to my workshop  ...  and a long way from the house  ...  so unless it's really bad, the idea of a bit of hum is not worrying me too much  ... ...  plus I can always have them dipped in transformer varnish if it does become an issue. My lovely wife came home tonight with a bundle of finger tip protectors  ...  like little rubber thimbles they used to use for counting money etc. I'll give them a whirl on my sensitive fingers. Sound like a real girl now.