Types of Machine Tools:
Lathes: In a turning or facing operation on a lathe, the workpiece rotates to provide the cutting motion, and the feed is by motion of the cutting tool. Lathes are used for the production of all kinds of components which are symmetrical about their axis of rotation.
( This and other pictures are from "Manufacturing Engineering" April - September 1996 magazines)
Drilling Machines: The cutting action results from the rotary movement of the cutting tool or workpiece, with a feed motion of the workpiece or tool, in the direction of the rotating axis. Drilling machines are used for drilling, boring, counter-sinking, reaming and tapping operations.
Vertical Drilling Center
Milling Machines: Similar to drilling. In the case of milling, both the tool and the workpiece can move horizontal or vertical direction. Milling machines are used to produce flat surfaces, sink, and slot.
Machining Centers (Horizontal / Vertical)
Transfer Machines: A number of work stations (turning, drilling, milling, etc.) aranged behind each other, linked by the means of an automatic work transportation unit, which governs their positions and the timing cycle.
Grinding Machines: Basicaly, the cutting tool provides the cutting movement on grinding machines. The contact between the workpiece and the grinding wheel is either on the wheel periphery or on the wheel face.
Honing Machines: The fundamental difference between honing and grinding techniques, is that when honing, the aim is only for an improvement in surface finish and dimensional accuracy.
Horizontal Machining Center
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Slides and Rails: Guildeways are frame elements that carry the workpiece table or spindles. There are two way types: box ways and roller ways.
Picture of way and frame
Electric motor are the prime movers for most machine tool functions. They mostly use 3-phase ac power supplied at 220 or 460 V. Today's spindles generally operate around 10,000 rpm or higher, ranges from 5-150 hp (3.7-112 kW).
Controls are the brain of all machine tool operation. Earily machine tool relied on operators to turn the wheels and pull the leverthat moved cutting tools and the workpiece. Today's machine tool are mostly relied on numeric control (NC), computer numerical control (CNC), programmable logic controller (PLC) and/or microprocessors.
Today, engineers create both parts design and the manufacturing programs to make them on a computer. First, an enginner designs a part using computer-aided design (CAD), then the design goes to a computer-aided manufacturing program (CAM). CAM will generate the tool-paths. Finally, the CNC on the machine tool will execute the tool-paths commands.
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Cutting tools remove metal from a workpiece are usually made of tungsten carbide which is form into inserts that are clamped onto a holder. In more recent times, high-speed steel are used for makeing tools. These steels are alloyed with chromium, tungsten,and cobalt to make them hard, strong, and resistant to mavhing heat at the cutting edge.
A tool holder is a device that holds the cutting tool. On milling and drilling machines, almost all toolholders are derivatives of Morse taper designs developed in the early 1900s. Despite the diversity in today's design, all tooholder have these common elements: a retention stud or threaded hole on one end, an external taper that nests in an internal spindle taper, a keyway on the front that drives the toolholder, and a means for holding a tool shank.
Tools (Inserts) & Toolholders
last modified 3/12/98 by email@example.com