Re: [CAD_CAM_EDM_DRO] Re: Tawagawa Seiki steppers

"Scott M. Thomas" wrote:

>
> If you read my response to Ward you will see that I have also decided this
> argument to be useless, but for other reasons than you state below.
>
> It is generally a bad thing to cause a transistor to conduct backwards, that
> is why we protect them with reverse biased diodes.

Well then your thinking on why it works it still completely wrong.
Those diodes only catch the spikes for when the transistor is switched
off. They don't have anything to do with why the voltage doesn't go
negative in braking mode. Like I said before, take two 2n2222
transistors and hook them to a coil from a stepper. It brakes when
they're on, period. No diodes, no other coils involved. You've
replaced your previous incorrect thinking with even worse thinking.
Worse because on the surface it can LOOK plausible, and you've already
convinced yourself it's true even with no testing or evidence, so you
will make more errors based on this bad knowledge in the future. When
you correct your knowledge base you find out the REAL, CORRECT answer.
Otherwise your technical thinking will improve much more slowly, always
having to fix every other related assumption based on all these little
bits of bad information.
Ego often clashes with leering. You're more interested in proving
yourself at least partially right than figuring out what is really
correct. That's no doubt why you haven't taken two transistors and
proven yourself wrong, you don't want to prove yourself wrong. Just
like it's apparent you also have breezed through my previous posts, you
don't want to see the right information. I stated exactly that it
worked with just the transistors and a seperate coil, nothing else.
You're supposed to suppress your ego and find out the RIGHT answers,
then let your ego build up later from knowing you have real knowledge.
You should use your ego to work for you, 'I have to know the real right
answer!', instead of using it to protect false knowledge.

>
> And if you factor in your earlier statement about 5 phase steppers in a
> pentagon configuration providing a pull up for the end I was concerned about
> going negative I have two things (the diode and the other coil) working to
> solve what i was considering a problem.

Neither of which have anything to do with why it REALLY brakes. I
only mentioned the other coil to show that it wouldn't even be high
impedance even IF your other thinking was correct. It isn't.

>
> See, no magic at all! ;)

Like I'm wrong and you're explaining the real right idea to me??
LOL! See, no magic is involved on my end either, but I'm correct
because I have worked out and tested what's really going on. Objective
reality is on my side, because I've made sure my thinking is on it's
side. None of your unsubstantiated theorizing can ever change that.
You're the one using pseudo science (worse than magic) to support your
ideas, with no real knowledge behind it..

> Truce?

Who needs a truce? I couldn't care less, you have a perfect right to
your incorrect ideas, you even have the right to replace them with more
wrong thinking if you like. Reality is objective, I'm correct and
you're not. You're the one thinking that it's somehow personal, and
that you can actually 'win' somehow by keeping coming up with different
answers. I don't say you're wrong, I say what really happens in circuit
proves you're wrong. But you really should check your ideas before you
spread them on the list, just like you cover your mouth before you
cough, or don't leave a dump in someone else's living room. At any rate
I can type fast so it only takes a few minutes to put out this correct
information, and that at least will help others on the list keep from
catching your bad ideas because they don't know any better, and because
you say them like you know what you're saying is true. It isn't a
personal attack, it really doesn't matter and I learned long ago you
just can't fix some people's thinking. But on the other hand if you
keep putting them out there, don't get upset when I make it clear
they're wrong when they are, so that other people don't think they're
right..

Alan