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Electronics for dummies - McComb G.

McComb G., Boes E. Electronics for dummies - Wiley publishing, 2005. - 433 p.
ISBN: 0-7645-7660-7
Download (direct link): electronicsfordummies2005.pdf
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Youíre probably most familiar with fractional size drill bits: %>-inch /8-inch, /4-inch, and so on. You refer to drill bits in between the standard fractional sizes by a number value. A #58 drill bit, common in electronics because itís just the right size for making holes for component leads in printed circuit boards, is a wee 0.042 inches in diameter. The closest common fractional size is Xe inch (0.040 inch). In non-fractional terms, you call a Xe-inch drill bit a #60 drill bit.
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Chapter 3: Outfitting Your Electronics Bench 53
Cutting things to size with a table saw or circular saw
A table, or circular, saw is a handy item that makes cutting through large pieces of wood and plastic easier. Use a guide fence, or fashion one out of wood and clamps, to ensure a straight cut. Consult the userís guide that came with your saw if youíre unsure what a guide fence or any other part of your saw is, or how to use it. Remember: safety first.
Be sure to use a fine-tooth saw blade if youíre cutting through plastic. Using a saw designed for general woodcutting can cause the plastic to shatter.
Getting intricate with a motorized hobby tool
The motorized hobby tool, such as the model in Figure 3-6, may look like a small drill motor, but it spins much, much faster: 25,000 revolutions per minute and higher. (By comparison, most drill motors spin at under 2,500 revolutions per minute.) The better hobby tools, such as those made by Dremel and Weller, have adjustable speed controls.
Use the right bit for the job. For example, donít use a wood rasp bit with metal or plastic because the flutes of the rasp fill with metal and plastic debris too easily. The instructions that come with the hobby tool help you match the bits to the material that youíre dealing with and the work that youíre doing.
Figure 3-6:
A motor hobby tool spins at a very high speed, and you can use it to drill, cut, and shape almost any material.
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54
Part II: Aisle 5, Component Shack: Stocking Up
Keeping Things Clean and Well-Oiled
Itís a fact of life: Electronics donít like dirt. Circuitry, components, and everything you use in your electronics projects must be bright, shiny, and clean, or things may not work right. You especially should start with a clean slate if youíre soldering parts to a circuit board. Dirt makes for bad solder joints; bad solder joints make for projects that either donít work at all or work only some of the time. Here are some products and techniques you can use to keep your electronics clean and tidy.
Spic-and-span electronics
You may already have most of the cleaning supplies that you need for electronics, so you may just want to make a quick run around your house to be sure that youíre stocked up. Hereís a checklist that you can use:
Soft cloth: Keep your workshop and tools dust-free by using a soft cloth. Avoid using household dusting sprays because some generate a static charge that can damage electronics.
Compressed air: You can remove dust from delicate electronic innards with a shot of compressed air. You can buy compressed air in cans, such as the one in Figure 3-7.
Figure 3-7:
Canned air? You bet, and itís great for blowing dust and dirt off delicate electronics.
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Chapter 3: Outfitting Your Electronics Bench
55
Household cleaner: Lightly spray a household cleaner, such as Formula 409 or Fantastik, to remove stubborn dirt and grease from tools, work surfaces, and the exterior surfaces of your projects. Because these cleaners are water-based, donít use them around powered circuits or you may short something out.
^ Electronics cleaner/degreaser: Use only a cleaner/degreaser made for use on electronic components when applying directly on parts and circuit boards. You can find the cleaner in a spray can and a bottle with a brush applicator.
Some electronics parts, especially motors, require a certain amount of grease or oil to operate. Be careful not to clean off the grease or oil that these parts need to function. If you must clean a part that requires lubrication, be sure to add fresh oil or grease when youíre done.
Oil and grease to keep parts slippery
Electronics projects that use mechanical parts may require both initial lubrication and periodic re-lubrication. Case in point: a walking robot. The leg joints need a dab of oil now and then to keep things running smoothly. Whether you use oil or grease depends on what youíre lubricating:
For parts that spin, use a light machine oil, such as the kind you use for sewing machines or musical instruments. Avoid using oil with anti-rust ingredients because these ingredients may react to plastic parts and cause them to melt.
For parts that mesh or slide, use a synthetic grease, such as lithium grease.
You can buy both light machine oil and synthetic grease at Radio Shack and other electronics stores, as well as many music, sewing machine, hobby, and hardware stores.
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