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2. Speeds and feeds - Wikipedia

   en.wikipedia.org/wiki/Speeds_and_feeds

   The cutting conditions will affect the value of this surface speed for mild steel. Schematically, speed at the workpiece surface can be thought of as the tangential speed at the tool-cutter interface, that is, how fast the material moves past the cutting edge of the tool, although "which surface to focus on" is a topic with several valid ...

3. Trencher (machine) - Wikipedia

   en.wikipedia.org/wiki/Trencher_(machine)

   It is cheaper to operate and maintain than chain-type trenchers. It can work in hard or soft soils, either homogeneous (compact rocks, silts, sands) or heterogeneous (split or broken rock, alluvia, moraines). This is particularly true because a cutting wheel works by clearing the soil as a bucket-wheel does, rather than like a rasp (chain ...

4. Built up edge - Wikipedia

   en.wikipedia.org/wiki/Built_up_edge

   The built up edge effectively changes tool geometry and rake steepness. It also reduces the contact area between the chip and the cutting tool, [1] leading to: A reduction in the power demand of the cutting operation. [1] Slight increase in tool life, since the cutting is partly being done by the built up edge rather than the tool itself. [4]

5. Cutting tool (machining) - Wikipedia

   en.wikipedia.org/wiki/Cutting_tool_(machining)

   The main features of the cutting edge are: form of the cutting edge: radius or waterfall or trumpet (reverse waterfall) cutting edge angles; form and size of the chamfers; The measurement of the cutting edge is performed using a tactile instrument or an instrument using focus variation. To quantify a cutting edge the following parameters are used:

6. Bucket-wheel excavator - Wikipedia

   en.wikipedia.org/wiki/Bucket-wheel_excavator

   A bucket wheel excavator (BWE) consists of a superstructure to which several more components are fixed. The bucket wheel from which the machines get their name is a large, round wheel with a configuration of scoops which is fixed to a boom and is capable of rotating. Material picked up by the cutting wheel is transferred back along the boom.

7. Dragline excavator - Wikipedia

   en.wikipedia.org/wiki/Dragline_excavator

   A dragline bucket system consists of a large bucket which is suspended from a large truss-like boom (or mast) with wire ropes. The bucket is maneuvered by means of a number of ropes and chains. The hoist rope, powered by large diesel or electric motors, supports the bucket and hoist-coupler assembly from the boom. The dragrope is used to draw ...