tutorials:learn:calipers:index.html
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tutorials:learn:calipers:index.html [2010/12/03 16:05] ladyada |
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| - | Dial calipers use a mechanical system consisting of a rack and pinion, there's a gear-set inside as well that moves the dial in increments of one hundredth of an inch (or tenth of a mm). To read, the 'most significant' value is read from the rule and the fractional value from the dial. The nice thing about dial calipers is that they don't use batteries and although are not waterproof, work well even if damp. | + | Dial calipers use a mechanical system consisting of a rack and pinion, there's a gear-set inside as well that moves the dial in increments of one thousandth of an inch (or hundredth of a mm). To read, the 'most significant' value is read from the rule and the fractional value from the dial. The nice thing about dial calipers is that they don't use batteries and although are not waterproof, work well even if damp. |
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| - | To replace the battery, just snap of the top cover, the battery is **44 **size 1.5V alkaline button battery, available in any hardware or grocery store. | + | To replace the battery, just snap of the top cover, the battery is **LR44/SR44 **size 1.5V button battery, available in any hardware or grocery store. The Silver Oxide SR44 costs more, but will last longer. |
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| - | The first measurement is using the 'outer' jaws. Use the flat part if possible, to avoid any skewing. Use the thumb-wheel to get a good tight grip on the material. You'll not it's not exactly 20mm, that's from the manufacturing tolerances, not the calipers. | + | The first measurement is using the 'outer' jaws. Use the flat part if possible, to avoid any skewing. Use the thumb-wheel to get a good tight grip on the material. You'll not3 it's not exactly 20mm, that's from the manufacturing tolerances, not the calipers. |
| [[http://www.ladyada.net/images/calipers/outer.jpg|{{ http://www.ladyada.net/images/calipers/outer_t.jpg?nolink&500x333 |}}]] | [[http://www.ladyada.net/images/calipers/outer.jpg|{{ http://www.ladyada.net/images/calipers/outer_t.jpg?nolink&500x333 |}}]] | ||
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