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NSB
Double Ended Outside Calipers 240mm Long Woodturning Bowl Calipers
$27.90Unit price /UnavailableIn stock -
40% off
NSB
Spring Outside Calipers 8in Square Arms Carbon Tool Steel
$17.90$29.90Unit price /UnavailableIn stock
Outside Calipers for Measuring External Dimensions with Precision
Outside calipers are a traditional yet highly effective tool used to measure the external dimensions of workpieces. Commonly used in woodworking and metalworking, they are ideal for checking thickness, diameters, and widths where a direct reading tool may not be practical. Rather than displaying a measurement, outside calipers transfer dimensions, allowing users to compare sizes against a ruler, vernier caliper, or reference gauge.
These tools are especially useful in turning applications, such as on a lathe, where accurate diameter checks are essential. By adjusting the caliper legs to fit snugly around a spinning or stationary workpiece, users can quickly assess whether they have reached the desired size. Spring joints or firm-joint designs help maintain consistent tension, ensuring repeatable measurements without slipping during use.
Proper technique and maintenance are important for reliable results. The contact points should be kept smooth and free from damage to avoid marking the workpiece. Consistent hand pressure and a light touch help achieve accurate transfers, while periodic checks against a known standard ensure the tool remains true. Outside calipers remain a simple, durable, and dependable option for precise external measurement in the workshop.
FAQs
What are outside calipers used for?
Outside calipers are used to measure or compare the external dimensions of an object, such as thickness or diameter.
How do outside calipers differ from vernier calipers?
Most outside calipers transfer measurements without displaying a reading, while vernier calipers provide a direct numerical measurement.
Can outside calipers be used on a lathe?
Yes, they are commonly used in turning to check diameters while shaping a workpiece.
How do I ensure accurate measurements with outside calipers?
Use a light touch, ensure the legs are evenly positioned, and compare the measurement against a reliable reference tool.
How should outside calipers be maintained?
Keep them clean and dry, lightly oil moving parts if needed, and store them safely to prevent damage to the measuring tips.