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Starrett 1202 Series Dial Calipers, Inch, Stainless Steel
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Product Specifications
- Accuracy
- N/A
- Brand Name
- Starrett
- Dial Face Color
- N/A
- Graduation
- N/A
- Manufacturer Series Number
- 1202 Series
- Material Type
- Stainless Steel
- Max Groove Depth
- N/A
- Range
- N/A
- Specific Uses For Product
- N/A
- Specification Met
- N/A
- System of Measurement
- Inch
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Key Features
- Precise dial graduations of 0.001", with one revolution equivalent to 0.100"
- Positive double pinion anti-backlash control for precise measurement
- Lock screw holds the sliding jaw in position, to ensure a consistent measurement
- Rack teeth point down to keep foreign matter from clogging the gear
- Hardened stainless steel bar, measuring surfaces, rack, gears, and depth rod for accuracy and long life
Product Description
The Starrett dial caliper has an accuracy of 0.001", sharp black graduations every 0.100" on the no-glare, satin-finished bar. It measures in inches and has crisp lines on the white dial face and knife edge contacts on the jaws. These calipers are for use in taking inside dimensions (ID), outside dimensions (OD), and depth measurements.
One full revolution of the dial is equivalent to 0.100”. The knife-edge contacts can be used to scribe parallel lines on the workpiece. This caliper can be used with one hand through operating the fine adjustment roll with the thumb. The lock screw locks the dial bezel and holds the sliding jaw in position. The depth rod is integrated into the rack of the caliper, unlike many calipers which offer a detachable depth rod, or none at all. The hardened stainless steel components, including the bar, measuring surfaces, rack, gears, and depth rod, offer corrosion resistance, increased accuracy, and long life. Positive double pinion anti-backlash control offers increased accuracy over standard gear configurations. Backlash is the amount of clearance between mated gear teeth in the caliper controls – which prevents the gear teeth from jamming. It is undesirable to have much backlash due to the lack of precision offered by the increased amount of play between gears. Certain gear designs can minimize or eliminate backlash. Double pinion anti-backlash systems have two round gears (also called pinions) in contact with the rack gear that extends down the length of the caliper itself. The two pinions have a lower chance of disengaging with the rack gear than a single gear, thereby keeping the caliper more accurate than a single gear anti-backlash system. The rack teeth point down to keep foreign matter from clogging the gear operations. This prevents measurement errors where metal chips could interfere with proper caliper operation.
Calipers measure the distance between two opposing sides of an object. They make inside, outside, depth, or step measurements, according to their type. Calipers are commonly used in architecture, metalworking, mechanical engineering, and machining. The simplest calipers have two legs to mark the two points and require a ruler to take the measurement. More complex calipers use two sets of jaws instead of legs and have up to two graduated scales. Vernier, dial, and digital calipers give direct and accurate readings and are functionally identical, having a calibrated scale with a fixed jaw, and another jaw with a movable pointer that slides along the scale. The vernier caliper has a scale sliding parallel to the main scale for an additional, fractional reading to improve measurement precision. The dial caliper has a circular dial with a pointer on a toothed gear rack replacing the second vernier scale. As with the vernier, this second measurement is added to the reading from the main scale to obtain the result. The digital caliper takes a differential by zeroing the display at any point along the slide, with an LCD that displays a single value in English and/or metric units.
The L. S. Starrett Company was founded in 1880, originally manufacturing bench vises, squares, and other tools. They acquired other companies throughout the years, expanding their services into making precision measurement instruments and tools, such as calipers, micrometers, saw blades, and gauges. Starrett is headquartered in Athol, Massachusetts and has manufacturing facilities in Brazil, the United Kingdom, China, and other locations.
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