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RE: [TCML] Looking for pulse cap - Free Samples & Criminals
Agree - though in the past I have honestly told a mfgr rep that I am experimenting and will need one or two of whatever the item is, and would like to buy them and have gotten free samples for my experiment - deception is seldom a path to friendship.
> Date: Thu, 17 Sep 2009 16:21:38 +1200
> From: stephenhiscock@xxxxxxxxx
> To: tesla@xxxxxxxxxx
> Subject: Re: [TCML] Looking for pulse cap - Free Samples & Criminals
>
> I agree with Quarkster... its pretty shameful to pretend to be
> manufacturing components with the intent to receive Free or even
> discounted components on the pretense that the company will recoup costs
> if you choose to use their product.
>
> If you tell a manufacturer that you intend to make 10,000 items of a
> product and you wish to "evaluate" their components to see if they will
> suit your product, but after receiving the product you only make one
> Tesla coil or Pulse Gun (because that is all you ever intended to make),
> then you are a CRIMINAL - ie you have commited FRAUD...
>
> On the other hand there is nothing wrong if you REALLY do intend to
> manufacture something, and tell them exactly what you will be using it
> for and how many products you will make.. But I doubt if a manufacturer
> will give free samples in the hope that in 10 years time your HOBBY
> might turn into a business selling Tesla coils or Rail Guns.
> -Stephen
>
>
> Quarkster wrote:
> > Shannon -
> >
> > Sorry, but in my opinion presenting a manufacturer with a totally
> > fraudulent "manufacturing plan" to try and "trick" him into providing
> > free samples is completely unethical. It may even be illegal.
> >
> > All "sample" parts provided by manufacturers cost money to fabricate,
> > test and ship. Manufacturers provide samples to Engineers and product
> > developers to stimulate usage of the parts in real-world products,
> > which results in volume sales of that component and profit for the
> > company. By lying to a manufacturer about your bogus "product
> > requirements" and potential future sales, and obtaining samples based
> > on those fraudulent claims, you are negatively affecting that
> > manufacturer's bottom line.
> >
> > American manufacturers are slowly being squeezed out of business by
> > many factors. Don't add to their problems by cheating. Unfortunately,
> > most component manufacturers don't really have the resources to check
> > the legitimacy of sample requests.
> >
> > If you REALLY have an interesting or unique application for a
> > manufacturer's components, talk to someone in the company's Marketing
> > department, and let them know that while your project is simply an
> > amateur experiment, it may be an interesting new application for their
> > product, that you would like them to consider helping to support your
> > project, and that you will send them a report and photos of the
> > completed widget. If they agree, great. If not, then just save your
> > pennies and buy parts like the rest of us.
> >
> > If you can't affort to purchase the parts for your Tesla projects,
> > take up a different hobby.
> >
> > Regards,
> > Herr Zapp
> > ----- Original Message ----- From: "Weinhold Shannon L"
> > <Shannon.L.Weinhold@xxxxxxxxxxxxxxx>
> > To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> > Sent: Wednesday, September 16, 2009 10:04 AM
> > Subject: RE: [TCML] Looking for pulse cap
> >
> >
> > You could always try to obtain samples from Cornell Dubilier...
> > They are pretty motivated to provide them if you present them with a
> > well written usage plan indicating that you intend to incorporate them
> > into something that you are manufacturing and intend to purchase a lot
> > more in the future.
> > I'm not going to say how many they sent me, but they are plenty generous
> > to potential customers.
> >
> >
> > "Failures are divided into two classes
> > those who thought and never did,
> > and those who did and never thought."
> > John Charles Salak
> >
> >
> > -----Original Message-----
> > From: Dave Leddon [mailto:dave@xxxxxxxxxx]
> > Sent: Tuesday, September 15, 2009 1:25 PM
> > To: Tesla Coil Mailing List
> > Subject: Re: [TCML] Looking for pulse cap
> >
> > Phillip, Steve,
> >
> > Thanks for your insight. You both responded almost simultaneously with
> > the suggestion that I raise the value of my tank cap to 1 uf which has
> > several advantages, not the least of which is that it reduces the
> > capacitor count down to something almost manageable. Using the
> > 940C8W2K-F caps ($5.99 at rell.com) I could get by with 9 strings of 17
> > each and given that I already have 38 of these on hand my out of pocket
> > expense would only be, ka-ching $690. Still a bit more than I can
> > justify. So if anybody knows where I can score 1 uf at around 10,000
> > volts for less money, please let me know.
> >
> > Thanks,
> > Dave
> > Pleasanton, ca
> >
> > At 11:20 AM 9/15/2009, you wrote:
> >> Herr Zapp,
> >>
> >> The lower voltage ratings you may have seen were for 2 reasons: less
> >> current and secondly, they were over stressed.
> >>
> >> I used to run my MMC caps with peak AC voltages at the DC rating, and
> >> after enough time, one by one, the caps would fail. Testing shows that
> >
> >> the cap makers arent fibbing about the VAC ratings, stick with that and
> >
> >> it will last for a really long time.
> >>
> >> Dave,
> >>
> >> Id suggest going up higher than .5uF, perhaps to 1uF or so (i didnt
> >> specify this in our correspondence). Im running 1.25uF on an
> >> experimental setup at 1500A, but a lower frequency. While you get less
> >
> >> amp-turns in the primary, you do arrive at the higher peak current
> >> level faster, which translates to achieving a certain top voltage on
> >> the toroid faster, which is more efficient (in my data i saw a 20%
> >> efficiency improvement going from 8 cycles to 5 cycles of operation by
> >> increasing the tank cap value). You have current to spare with those
> >> big CM600s, so you should have no problem producing well over 10 foot
> >> sparks (id guess in the 14-16 foot range, secondary coil withstanding).
> >>
> >> Steve
> >>
> >> On Tue, Sep 15, 2009 at 10:48 AM, Quarkster <quarkster@xxxxxxx> wrote:
> >>
> >> > Matt -
> >> >
> >> > Eh??
> >> >
> >> > Clearly, my post contained no answers whatsoever, only questions to
> >> > try to gain a better understanding of Dave's rather unique capacitor
> > requirements.
> >> >
> >> > Most of the large DRSSTCs that I've seen get by using a cap with a
> >> > lower voltage rating, but they may not actually be attaining a
> >> > primary current of 2400A.
> >> >
> >> > Regards,
> >> > Herr Zapp
> >> > ----- Original Message ----- From: <mddeming@xxxxxxx>
> >> > To: <tesla@xxxxxxxxxx>
> >> > Sent: Monday, September 14, 2009 5:37 PM
> >> >
> >> > Subject: Re: [TCML] Looking for pulse cap
> >> >
> >> >
> >> >
> >> >> Hi Herr Zapp,
> >> >>
> >> >>
> >> >>
> >> >> Interesting questions, but how do they relate to answering the
> >> >> question Dave asked?
> >> >>
> >> >> Matt D.
> >> >>
> >> >>
> >> >>
> >> >> -----Original Message-----
> >> >> From: Quarkster <quarkster@xxxxxxx>
> >> >> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> >> >> Sent: Mon, Sep 14, 2009 4:36 pm
> >> >> Subject: Re: [TCML] Looking for pulse cap
> >> >>
> >> >>
> >> >>
> >> >> Dave -?
> >> >> ?
> >> >> A few questions:?
> >> >> ?
> >> >> 1. How are you calculating the voltage requirements for the tank
> > cap??
> >> >> ?
> >> >> 2. How large a multiplier are you using to define the capacitor's
> >> >> voltage margin (safety factor)??
> >> >> ?
> >> >> 3. What is the manufacturer's voltage rating for the IGBTs you will
> >
> >> >> be using??
> >> >> ?
> >> >> 4. What is the calculated peak primary current??
> >> >> ?
> >> >> Regards,?
> >> >> Herr Zapp?
> >> >>
> >> >>
> >> >>
> >> >>
> >> >> ----- Original Message ----- From: "Dave Leddon" <dave@xxxxxxxxxx>?
> >> >> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>?
> >> >> Sent: Monday, September 14, 2009 11:19 AM?
> >> >> Subject: [TCML] Looking for pulse cap?
> >> >> ?
> >> >> Hi all,?
> >> >> ?
> >> >> ? I'm working on a fairly large DRSSTC and I find that an MMC
> >> >> adequate to
> >> >>
> >> >> ?the task may be out of my financial reach. If I were to push the
> >> >> igbt
> >> >>
> >> >> ?bridge to its limits I would require a cap rated at 20 kv at 0.5
> > mfd.
> >> >>
> >> >> ?This begins to sound like pole pig territory. If anyone has a cap
> >> >> like
> >> >>
> >> >> ?this that they would consider selling, or if they know of a
> >> >> resource that
> >> >>
> >> >> ?I can pursue, please let me know.?
> >> >> ?
> >> >> Thanks,?
> >> >> Dave?
> >> >> Pleasanton, Ca?
> >> >> ?
> >> >>
> >> >>> _______________________________________________?
> >> >>> Tesla mailing list?
> >> >>> Tesla@xxxxxxxxxxxxxx?
> >> >>> http://www.pupman.com/mailman/listinfo/tesla ?
> >> >>>
> >> >> _______________________________________________?
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> >> >>
> >> >> _______________________________________________
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> >> >>
> >> >
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