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A tachometer (revolution-counter, tach, rev-counter, RPM gauge) is an instrument measuring the rotation speed of a shaft or disk, as in a motor or other machine. [1] The device usually displays the revolutions per minute (RPM) on a calibrated analogue dial, but digital displays are increasingly common.
A rev limiter is a device fitted in modern vehicles that have internal combustion engines. They are intended to protect an engine by restricting its maximum rotational speed, measured in revolutions per minute (RPM). Rev limiters are pre-set by the engine manufacturer. There are also aftermarket units where a separate controller is installed ...
The "feeds" may be for the X-axis or the Z-axis (typically mm/rev or inch/rev for lathe work; sometimes measured as mm/min or inch/min). Notice that as the tool plunges closer to the workpiece's center, the same spindle speed will yield a decreasing surface (cutting) speed (because each rev represents a smaller circumferential distance, but ...
Several mechanical counters Mechanical counter wheels showing both sides. The bump on the wheel shown at the top engages the ratchet on the wheel below every turn. Early IBM tabulating machine using mechanical counters. Mechanical counters are counters built using mechanical components. They typically consist of a series of disks mounted on an ...
The CD V-700 (often written as "CDV-700") is a Geiger counter employing a probe equipped with a Geiger–Müller tube, manufactured by several companies under contract to United States federal civil defense agencies in the 1950s and 1960s. While all models adhere to a similar size, shape, coloring and form-factor, there were substantial ...
A tally counter is usually cased in metal and is cylindrical in shape. Part of the circle is flattened out and contains a window of plastic or glass. Inside the counter are a number of rings with the numbers from 0 to 9 in descending order going clockwise. Most counters have four such rings, allowing the user to count up to 9999.
The Astrarium had seven faces and 107 moving parts; it could show and predict the positions of the sun, the moon, stars and the five planets then known, as well as religious feast days. [ 9 ] Pascaline , 1642 – Blaise Pascal 's arithmetic machine primarily intended as an adding machine which could add and subtract two numbers directly, as ...
ISO 2372:1974 Mechanical vibration of machines with operating speeds from 10 to 200 rev/s — Basis for specifying evaluation standards [Withdrawn: replaced with ISO 10816-1] ISO 2373:1987 Mechanical vibration of certain rotating electrical machinery with shaft heights between 80 and 400 mm — Measurement and evaluation of the vibration ...