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A line drawing showing some basic concepts of speeds and feeds in the context of lathe work. The angular velocity of the workpiece (rev/min) is called the "spindle speed" by machinists. Its tangential linear equivalent at the workpiece surface (m/min or sfm) is called the "cutting speed", "surface speed", or simply the "speed" by machinists.
A machinist calculator is a hand-held calculator programmed with built-in formulas making it easy and quick for machinists to establish speeds, feeds and time without guesswork or conversion charts. Formulas may include revolutions per minute (RPM), surface feet per minute (SFM), inches per minute (IPM), feed per tooth (FPT). A cut time (CT ...
It relates to spindle speed via variables such as cutter diameter (for rotating cutters) or workpiece diameter (for lathe work). SFM is a combination of diameter and the velocity ( RPM ) of the material measured in feet-per-minute as the spindle of a milling machine or lathe . 1 SFM equals 0.00508 surface meter per second (meter per second, or ...
Spindle speed is derived from cutting speed, but cutting speeds and feeds deserve an article of their own, especially from a metalworking perspective. I'm not altogether happy with the intro and point form layout but I wanted to include woodworking and grinding as they are both affected by spindle speed slightly differently.
A compressor map is a chart which shows the performance of a turbomachinery compressor.This type of compressor is used in gas turbine engines, for supercharging reciprocating engines and for industrial processes, where it is known as a dynamic compressor.
The ABEC scale is an industry accepted standard for the tolerances of a ball bearing.The ABEC scale is designed to provide bearing manufacturers dimensional specifications that meet the standards of precision bearings in a specified class.
This means that it is possible to feed a round directly into the chamber, as is possible with push-feed designs. Push feed mechanisms on the other hand have an extractor which is designed to move around the rim of an already chambered round, and the cartridges can therefore either be fed via the magazine or hand fed directly into the chamber ...
Taffrail Log Rotator Mechanical speed logs called patent logs [1] or taffrail logs, operating on physical principles in a manner similar to a car's odometer by towing a vane or rotor from the stern (or taffrail) by a long line, were developed in the eighteenth century (or earlier) but became practical in the nineteenth century and replaced the ...