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Tag Archives: cnc mill workshop

PLASMA BEAM MACHINING

A great deal of interest and development of plasma beam has occurred in recent years. Plasma is created by passing a gas through an electric arc. The gas is ionized by the arc, and an extremely high temperature results. Temperatures in plasma arcs can exceed ( ), many times hotter than any arc or flame …

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HYDROJET MACHINING

The cutting tool in this process is an extremely high pressure water jet. Pressures of several thousand pounds per square inch are used to pump water through a small nozzle, thus abrasive material directing a narrow stream at the workpiece. The efficiency of the process is enhanced by adding an abrasive material to the water. Thus, …

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ELECTROCHEMICAL MACHINING AND ELECTROCHEMICAL DEBURRING

Electrochemical machining (ECM) is essentially a reverse metal-plating process (Figure M-112). The process takes place in a conducting fluid or electrolyte pumped under pressure between electrode and workpiece. As workpiece material is deplated, it is flushed away by the flow of electrolyte. Workpiece material is removed from the electrolyte by a filtration system. Advantages and …

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SINGLE-POINT THREADING

One of the considerations in threading is the lead-in and ending of a thread (Figure M-69). When the threading operation begins, the spindle is rotating at the correct spindle speed, but the tool is not moving. Distance A, or at least part of it, is traveled while the feed rate is accelerating from zero to a …

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GENERAL PROGRAMMING TECHNIQUE

There are no hard-and-fast rules for CNC programming. Ten different machinist programmers will probably come up with 10 variations in developing a program for the same part. Your experience in manual machining will provide the basis for developing a CNC program, and like all things, your programs, at least early on, will go through …

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RECTANGULAR AND POLAR COORDINATES

Consider a blank sheet of paper on the desk before you and imagine that you wish to define specific locations on the paper relative to the center of the sheet. You could start by drawing a vertical and a horizontal line on the paper and identifying these by the letters X and Y (Figure …

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ADDITIONAL CAPABILITIES OF THE TOOL AND CUTTER GRINDER

Additional capabilities of this machine include sharpening of reamers, taps, drills, and single-point cutting tools. Having a power-driven workhead permits cylindrical grinding (Figure L-179). The workpiece may be held in a threejaw chuck (Figure L-180) or on a magnetic grinder chuck (Figure L-181). The internal grinding attachment permits internal cylindrical grinding (Figure L-182). The swiveling capability of the workhead permits regrinding of lathe …

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CYLINDRICAL GRINDING A LATHE MANDREL

A lathe mandrel is a common and useful machine shop tool. Precision mandrels are finished by cylindrical grinding after they have been machined and heat-treated. Finish grinding the mandrel will provide you with basic experience in cylindrical grinding. Refer to a working sketch (Figure L-130) to determine the required dimensions. Selecting the Wheel For a hardened …

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IDENTIFYING MACHINE PARTS AND THEIR FUNCTIONS

On the center-type cylindrical grinder (Figure L-110), the workpiece is mounted between centers much as it would be in the lathe. The plain cylindrical grinder (Figure L-111) has a fixed wheelhead that cannot be swiveled, only moved toward or away from the center axis of the workpiece. The table can be swiveled to permit the …

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GRINDING VEE BLOCKS

The vee block (Figure L-87) is a common and useful machine shop tool. Precision types are finish machined by grinding after they have been rough machined oversize (about .015 in.) and heat-treated. Finish grinding of vee blocks will provide you with a variety of surface grinding experiences. Refer to a working drawing (Figure L-88) …

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