You can buy pre-gapped cores where only the centre face gets ground back.
Since the rims aren't ground back, the core remains self-shielding.
Some people really don't like having their bad ideas criticised.
If it was as wonderful as you seem to think, there wouldn't be any market for cores where on the central part was ground down.
The people you've worked for might not have known enough to have adopted that solution, but there are clearly some better-informed people around.
-- Bill Sloman, Sydney
Bill Sloman wrote in news:f6566bc0-282b-414d- snipped-for-privacy@googlegroups.com:
Don't need a primer from a retard... and particularly not from a retard like you.
Bill Sloman wrote in news: snipped-for-privacy@googlegroups.com:
You are an idiot. Different application, you stupid f*ck.
People making several M of some lame, noisy switcher use weak consistency, mass produced crap like that.
Folks making a one off or three for a mil contract tend to like tuning their circuits by hand. That means precise adjustment, and NO, leakage is NOT an issue.
IOW, you are still proving yourself to be a goddamned idiot.
Bill Sloman wrote in news: snipped-for-privacy@googlegroups.com:
We characterized both, you retarded piece of shit. HOAD.
What makes you think that?
You can use a screw in adjustor to do that. It does make small changes to the effective gap, and will vary the coupling between separate coils a little, but this doesn't usually matter.
To your idiosyncratic satisfaction. Your grasp of what might constitute "proof" isn't impressive.
-- Bill Sloman, Sydney
Well, you clearly do need some kind of primer. Your judgement about what you know versus what you need to know isn't exactly impressive.
-- Bill Sloman, Sydney
Bill Sloman wrote in news: snipped-for-privacy@googlegroups.com:
No, idiot. An adjustable inductor has been around that long.
A pot core with a center post gap does NOT "adjust the ground-in gap" using the central hole and some screw device.
Closing such a gap using pressure from your screw? would cause the core to crack or put it into restriction, affecting saturation point and eddy heating effects (that magnetostriction you know nothing about)(the mechanically introduced variety)
Opening it would also open the apron of the core and defeat your entire argument. Oops.
So the ONLY thing you could possibly offer as "adjustment" by this "screw" is adjustment of the inductance by the introduction of a ferrous screw.
That does exactly nothing to a transformer.
THAT is NOT the goal, you stupid f*ck.
Bill Sloman wrote in news: snipped-for-privacy@googlegroups.com:
You are wrong. A physical adjustor could not close the gap without stressing the ferrite media. Opeing the gap would involve exposing a new gap at the rim since your precious gapped core is only gapped at the center post.
So I know that is NOT how ANY "adjustor" would work.
You jacked off at the mouth about some 'data sheet', but I do not see it here.
I think you read that wrong too (where is this data sheet). Machining specs are rarely given in microns for parts this big.
Obviously not. The adjustor contains a chunk of ferrite the bridges the gap to some extent. This isn't the same as moving the ground bits of of core a round but it does vary the total reluctance of the magnetic circuit.
No. Moving a small chunk of ferrite in a plastic carrier close to or into t he gap.
ation point and eddy heating effects (that magnetostriction you know nothin g about)(the mechanically introduced variety).
Magnetostriction (good that you've managed to learn the right word) doesn't have anything to do with eddy heating. Eddy heating is caused by eddy curr ents. Magnetostriction is a small mechanical movement caused by a change in magnetic field. A slow change in magnetic field will cause slow a change i n the shape of the core, but no perceptible heating.
shows the adjustor on page ten. It's clearly designed to slide up and down inside the centre hole, rather than bending the ferrite.
I wonder what DLUNU thought he was saying there. "Apron of the core" is new to me.
It is not ferrous. What moves is a small lump of ferrite. When it's inside one or other core half, it doesn't do anything. When it starts bridging par t of the gap it does have an effect.
So why are they still being sold?
-- Bill Sloman, Sydney
Bill Sloman wrote in news: snipped-for-privacy@googlegroups.com:
Ferrite media is decidedly ferrous, you stupid twit.
Inductor. NOT transformer.
PKB, you stupid f*ck.
page ten show the adjustor which slides up and down inside the centre hole.
When it is bridging the gap, it reduces the relunctance of the magnetic circuit around the coil. There's no new gap.
You are quite correct. That's not how it works. You need to understand how it does work.
This may take some time.
I've re-posted it, again.
The dimensions are mostly in millimetres. The gaps on page three run from 0.04 mm (40 micron) to 0.49 mm (490 micron).
Those are given as approximate values because the actual gap is ground to give the right inductance factor - Al - in nano-Henries per root turn.
-- Bill Sloman, Sydney
Restoring the bit of your text that you snipped
"screw" is adjustment of the inductance by the introduction of a ferrous screw.
But the ferrite that moves isn't any kind of screw. It gets moved by a scre w which the data sheet describes a "tube core with thread and core brake ma
Polyterephthalate isn't ferromagnetic.
A transformer is an assembly of coupled inductors.
You were telling us to change the ringing of a circuit by changing the gap in the transformer, which mainly changes the inductance of each of the coil s in the transformer.
You then insisted that you can do it more "precisely" with lumps of transfo rmer tape, which doesn't happen to be right.
-- Bill Sloman, Sydney
Not true, if this is a high frequency component. The 'grounding' is not nearly as important as completing the wrap and having conduction around the circumference. One frequently sees the shorted-winding wrap around E-cores, as well (but it's more effective with pot cores).
Gapping the INNER magnetic poles of a core does the performance improvement, but does NOT keep it from being self-shielding. So, you can get both self-shielding and gapped performance. The kicker is, it can't be done with a tape spacer, it has to be a center-leg-grind operation.
Bill Sloman wrote in news: snipped-for-privacy@googlegroups.com:
You are an idiot. I know more about fits and tolerances than you ever witl.
I gave the cranshaft example.
I also fitted king pins, which are an order of magnitude more tightly toleranced and fitted than a crankshaft journal.
I also made a tool head that was so fast that it could turn a square peg on a lathe. It is used to produce optical grade surface quality finishes on large diameter contact lens molds that end up in thoroughbred horses. It had a 2mm transition and was fired at 2kW by our amplifier from 20 to 20,000 Hz per customer spec. It is used to this day. It used a 4.5 inch long piezo stack and a 2:1 rocker arm. So the piezo stack had a 1mm transition through the frequency range, and the feedback loop allowed them to dial out all mechanical backlash in the lathe. They could literally turn optical grade surfaces first pass.
They have since blossomed as a company and have everything integrated into their cabinets now. The early unit was our 2KW amp, and the tool head that went onto and stood beside their lathe. But that is still the same piezo stack tool actuator as the one we designed.
Nice try though, Silly Billy.
I also have more Drafting, CAD, and modeling experience and training than you do. Years more.
So, I do know how to measure. I measured you up as the 100% asshole dipshit I touted you as, and you prove it every time you post. My experience is vastly greater than yours with transformers AND precision measurement.
Probably not true.
Which was an example of working within tolerances. The ideas involved in setting them up seem to have escaped you.
You may know how - that isn't difficult to learn. You don't seem to know why, or what influences how accurately you need to measure.
-- Bill Sloman, Sydney
Bill Sloman wrote in news: snipped-for-privacy@googlegroups.com:
No, Idiot. It involved measuring as built clearances.
That assembly stack DOES vary. The elements and their tolerances are bigger.
The 1 mil tape spacer on my pot cores DOES NOT VARY. The elements involved and their tolerances do NOT vary. Not one iota!
Crankshaft: Three Thousandth inch differences matter. They vary enough that each and evry one gets read when assembling an engine.
Pot core: one ten thousandth inch differences DO NOT matter! Any variances are so small that not only does each and every one NOT need to be read, but NONE need to be read after the proto builds.
Bill Sloman wrote in news: snipped-for-privacy@googlegroups.com:
No shit, dumbfuck. Knowing when where and how matters. Pretty plain that you are not able to do so.
You keep making this retarded dumbfuck assertion. It makes you look more like a retarded dumbfuck than your other posts. Even though you already carried that image.
Yes, I do, idiot. I know two orders of magnitude more about it than you do and why. I have seen bed heaters on the slates of carom tables. But I am quite sure you are lost one that one too.
I have been posting pics of the new kilogram standard. It is the most perfectly round, highest polished device ever made by man.
I know WAY MORE than you about it. Fuck you, Bill Sloman.
Bill Sloman wrote in news: snipped-for-privacy@googlegroups.com:
No, you retarded f*ck. That is not what you snipped.
You snipped the device details I told you about that could produce optical quality surface cuts on a lathe.
You snipped it because it further proved that your lame assertion that I do not know what is going on is bullshit.
You, Bill Sloman, are bullshit.
Also known as diamond turning. It's been around for a while.
Actually, it demonstrated it once again.
You do seem attached to this comforting delusion.
-- Bill Sloman, Sydney
Bill Sloman wrote in news:31c147c0-25e9-45b5- snipped-for-privacy@googlegroups.com:
No, it has not. And that is not what it is called.
Turning a shaft with a tool against it is "turning". This 'tool' transitions at up to 20kHz and can turn curves surfaces and even turn a shaft into a square peg. Standard lathes do not do that. With that system, both the lathe and the tool head transitions and all the backlash gets taken out. There is no diamond.
And the US also now has laser assisted turning that yields an even higher quality surface.
You? You are the has been. And that is even in question as to whether you ever was an anything been.
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