Post by thread:[EE] Supplier of washers for toroids?

Are you just looking for a fender washer, available at any common hardware store? Big washer, little hole? Or do these things need to be made of a special material? --Danny Harold wrote regarding '[EE] Supplier of washers for toroids?' on Thu, Dec 29 at 11:27: > Anyone know of a US wholesale supplier of washers for mounting toroid > inductors? These things are something like 2 inch diameter.

> Are you just looking for a fender washer, available at any common > hardware store? Big washer, little hole? Or do these things need to > be made of a special material? > > --Danny No special material - I think the ones we've been getting are steel. Finding "fender washers" with about a 2.5 inch diameter is difficult. When we do find them, no one has a package of a thousand or so. Better than a flat washer would be one that is "dented" where the center is in a different plane than the outside. This helps keep the chokes from wandering around the bolt. Any ideas? Thanks! Harold -- FCC Rules Updated Daily at http://www.hallikainen.com

Harold Hallikainen wrote: > No special material - I think the ones we've been getting are steel. > Finding "fender washers" with about a 2.5 inch diameter is difficult. When > we do find them, no one has a package of a thousand or so. Better than a > flat washer would be one that is "dented" where the center is in a > different plane than the outside. This helps keep the chokes from > wandering around the bolt. Any ideas? Mcmaster-Carr... or your local CNC sheet metal fabricator.

Harold wrote regarding 'Re: [EE] Supplier of washers for toroids?' on Thu, Dec 29 at 12:13: > No special material - I think the ones we've been getting are steel. > Finding "fender washers" with about a 2.5 inch diameter is difficult. When > we do find them, no one has a package of a thousand or so. Better than a > flat washer would be one that is "dented" where the center is in a > different plane than the outside. This helps keep the chokes from > wandering around the bolt. Any ideas? Oh, I guess that is kinda big - the places that come up first in a Google search all stop at 2 inch. Well, that sucks. Do you have to use a washer? Couldn't you use a flat piece of the right diameter, which would be easier to bend in to fit as well? --Danny

> Anyone know of a US wholesale supplier of washers for mounting toroid > inductors? These things are something like 2 inch diameter. Hmmm... how about... http://www.toroid.com/mounting_hardware/poly_mount.htm or http://www.toroid.com/mounting_hardware/washer.htm -- Mark

On 12/29/05, Marcel duchamp <spam_OUTmarcel.duchampTakeThisOuTsbcglobal.net> wrote: > Harold Hallikainen wrote: > > No special material - I think the ones we've been getting are steel. > > Finding "fender washers" with about a 2.5 inch diameter is difficult. When > > we do find them, no one has a package of a thousand or so. Better than a > > flat washer would be one that is "dented" where the center is in a > > different plane than the outside. This helps keep the chokes from > > wandering around the bolt. Any ideas? > > Mcmaster-Carr... or your local CNC sheet metal fabricator. > Mcmaster has 'em for $6.90 for ten, part 98264A175. Seems expensive. A lot of the power supplies (consumer electronics) I've opened hold the toroids to the PCB with a couple of zip ties. Regards, Mark markrages@gmail -- You think that it is a secret, but it never has been one. - fortune cookie

I have seen plastic spacers or wood dowling used down thru any hole that is left. Then a big flat washer or flat stock with the red silicon rubber under it as a buffer? Use plastic bolts or all-thread, you don't want to add a shorted turn in the hole or couple voltage to the top washer. {Original Message removed}

Thanks! I've passed this on to purchasing. Harold {Quote hidden}>> Anyone know of a US wholesale supplier of washers for mounting toroid >> inductors? These things are something like 2 inch diameter. > > > Hmmm... how about... > > http://www.toroid.com/mounting_hardware/poly_mount.htm or > > http://www.toroid.com/mounting_hardware/washer.htm > > -- Mark > > > -

On Thu, 29 Dec 2005, Marcel duchamp wrote: > Harold Hallikainen wrote: >> No special material - I think the ones we've been getting are steel. >> Finding "fender washers" with about a 2.5 inch diameter is difficult. When >> we do find them, no one has a package of a thousand or so. Better than a >> flat washer would be one that is "dented" where the center is in a >> different plane than the outside. This helps keep the chokes from >> wandering around the bolt. Any ideas? > > Mcmaster-Carr... or your local CNC sheet metal fabricator. CNC ? Surely you mean metal punch operator ? Peter

On Thu, 29 Dec 2005, Danny Sauer wrote: > Oh, I guess that is kinda big - the places that come up first in a > Google search all stop at 2 inch. Well, that sucks. > > Do you have to use a washer? Couldn't you use a flat piece of the > right diameter, which would be easier to bend in to fit as well? I think that the idea is to have something that does not bend easily after being formed. For 2.5 in it should be about 1mm thick mild steel, or even more. Peter

Peter wrote regarding 'Re: [EE] Supplier of washers for toroids?' on Fri, Dec 30 at 14:02: > On Thu, 29 Dec 2005, Danny Sauer wrote: > > Do you have to use a washer? Couldn't you use a flat piece of the > > right diameter, which would be easier to bend in to fit as well? > > I think that the idea is to have something that does not bend easily > after being formed. For 2.5 in it should be about 1mm thick mild steel, > or even more. If it sucked in a little when tightening, the spring effect could potentially be useful, and would prevent damage due to overtorquing. Though I was talking about forming a bracket before assembly - something along the lines of -\__/- as viewed from the side (ugh, ASCII art) would be pretty easy to create with just a vice and a hammer (or a proper metal bending brake). Not that this matters much, given that a supplier was located yesterday... :) --Danny

> > > On Thu, 29 Dec 2005, Marcel duchamp wrote: > >> Harold Hallikainen wrote: >>> No special material - I think the ones we've been getting are steel. >>> Finding "fender washers" with about a 2.5 inch diameter is difficult. >>> When >>> we do find them, no one has a package of a thousand or so. Better than >>> a >>> flat washer would be one that is "dented" where the center is in a >>> different plane than the outside. This helps keep the chokes from >>> wandering around the bolt. Any ideas? >> >> Mcmaster-Carr... or your local CNC sheet metal fabricator. > > CNC ? Surely you mean metal punch operator ? > Yep! CNC, as I recall, is Computer Numeric Control, to contrast it from those good ol' hand positioned punches. We've got a quote from our local CNC shop, and, from what I hear, it's high. Someone also suggested a rectangular piece of metal with four bends in it (ascii art was something like --\__/-- ). We tried something like that and the middle part got "sucked in to" the middle of the cores as the bolt was tightened. Eventually the chokes came loose as the metal continued to bend. THANKS for the ideas thus far! Harold -- FCC Rules Updated Daily at http://www.hallikainen.com

On Fri, 30 Dec 2005, Harold Hallikainen wrote: > Someone also suggested a rectangular piece of metal with four bends in it > (ascii art was something like --\__/-- ). We tried something like that and > the middle part got "sucked in to" the middle of the cores as the bolt was > tightened. Eventually the chokes came loose as the metal continued to > bend. There is a better way to make the bracket: /---\ x b | C ---/ C | --- \---/ x The x is where the bolt goes and C where the core goes. Covered with thick heat shrink tube to avoid damaging the wire. At 'b' it must curl back to avoid making a hole in the wire with the sharp edge. This part can be made to retain a nut (preventing it from spinning). Peter