May-Jun, 2006
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In This Issue
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State of the Art
Commentary:
Designer's Block
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Design Files
Mechanical Relays
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Fundamentally So..
Norton's Theorem
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Book Reviews
Franklin D. Jones:
Ingenious Mechanisms for Designers and Inventors
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Reader's feedback
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About Us
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Conditions of Use
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Designer's Block

Everyone has heard of writer's block - it is when the words do not seem to come and a writer is stuck at some point in the story process. At times even the best designers go through the same thing. There is no common name for it because, thankfully, there are a lot less wannabe designers then writers. So, let's just call it designer's block.

For designers (and most likely writers too), the cause of the blockage can be a paradox - it is not that the designer runs out of options, but there are two many options to choose from, and the decision which to include and which to exclude can be excruciatingly frustrating. Afraid of omitting something critical, or choosing an implementation path that turns out to be expensive and difficult to debug, a design can come to standstill while the the designer pounders and fusses.

So, what are some methods of overcoming designer's block?

First, do your up-front planning first and before you start actual design, have a comprehensive set of product requirements and a product specification. If you do not know where you are going, not only will any path will get you there, but you also have a real chance of not knowing where you are when you get there - or for that matter not knowing if you are even there yet! A good specification should help eliminate design "fluff."

Second, when stuck on a technical detail, call in the vendor's technical support team. Don't be afraid to ask questions, it's their job to provide answers. These guys (and gals, too!) know their product, and have seen a lot of different designs. Most likely they can both answer your technical questions, and guide you to a solution you never thought of - all at the same time. Remember, as a designer you are responsible for the function of the whole product. Have the experts guide you on best way to use their product to achieve that function.

Third, sometimes you just need to step back and take a breather. Usually, the missing solution is right there, but you need some time for your mind to shift through the minutia of cluttering extraneous details and background noise before you see it clearly. The best designers I know usually have at least two projects going on at a time, or if the project is large enough, have broken the design into two or more subsections they can work on independently. It is funny how the "solution" pops into your mind so easily when you are doing something else.

Finally, there are what experienced designers call "24hr" problems. These are points in a design where you know what you need to do, but the complexity is such that you cannot start and restart again without spending most of your restart time remembering all the little details of where you left off. You get into a kind of a tail spin process, seeming to never get beyond the same point at quiting time. Every designer will have a couple of these in their careers. The only solution here is to kiss the spouse and kids good bye, lock the doors and work the problem out to a final solution. You WILL reach the solution, and when you do, it will be one of the most satisfying moments of your career..





Mechanical Relays.

When you need to switch a heavy load with a light current, or need to physically isolate a switched circuit, the relay is one of the best components available. Cheap and rugged, the mechanical relay comes in a variety of sizes and rating. But to effectively use a relay, you need to understand how it operates and its limitations

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Norton's Theorem

Norton's Theorem states that any linear combination of voltage and current sources and resistances can be replaced by a single ideal current source Ig and a single parallel resistor Rg.

Norton equivalent circuits are transformations of Thevenin equivalent circuit - if you know either equivalent, the other is easily derived.

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Franklin D. Jones: Ingenious Mechanisms for Designers and Inventors.

In today's design (perhaps outside of automobile and heavy machinery), rarely do you see much mechanical linkages. Motion control is usually done directly with cheap servo motors, and microprocessor control. Even so, if the "end" movement of the drive needs to deliver a specialized motion profile - this set of books most likely has a solution already worked out for you.

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We would like to hear from you!

The Mechatronics Designer is news letter for practitioners of the art of Mechatronics Design. We would like to hear from you any comments about the content, and suggestions for new topics to cover.

You can drop us a line on the Contact page




Our Mission

Mechatronics Designer is a publication of McGourty Associates, LLC. The mission of this news letter is two-fold: first to announce to interested designers our latest product development efforts, and second to provide a forum for industry news and application ideas.



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