The rotational speed of the spindle measured in revolutions per minute. This number is multiplied by the workpiece diameter on a lathe or the tool diameter on a milling machine to get the cutting spee [..]

Bandsaws have an upper blade guide (and another under the table). Saws built in the last 30 years have a guard built into the guide to reduce the liklihood of getting cut. The guard covers the blade f [..]

The small, stray peice of material left along the edge of the part after a cut. They should be sanded off. C

A very short, stiff drill used for accurately starting drilled holes. center finder

A tool used for making small, conical depressions in ductile materials (doesn't work in glass, etc) to mark the location of holes. These depressions are then used by the machinist (using acenter [..]

A machinist's compass is used for layout work. Basically the same object as used in high school math classes. coolant

Cutting speed is usually expressed in units of "surface feet per minute". The cutting speed of a tool is the maximum relative speed between the workpiece and the part of the tool that is in [..]

People are sloppy with this term. A dial indicator has a rod that is displaced along its axis. The rod is connected to a gear rack on manual indicators and to who knows what on the electronic ones. Th [..]

The tip of a mechanical edgefinder moves to indicate that the edge of the part has been located relative to the centerline of the tool. On electric edgefinders, which are becoming more common, a light [..]

Hand feeds and power feeds are screws, driven by hand cranks or motors, that move the axes of machine tools. fillets