This technical information has been contributed by
Pacific Swiss & Manufacturing, Inc.

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CNC Swiss Screw Machining Glossary

CNC Swiss Screw Machining

TermDefinition
American-type single-spindle screw machineA modified automated lathe distinguished by a turret that approaches a workpiece from the axial orientation.
automatic bar machineA turning machine that continuously cuts a number of parts from a piece of bar stock, one after another. The bar stock advances through the spindle and is held by the collet during the operation. A bar machine is traditionally called a screw machine.
axial approachA tool approach that runs parallel to the axis of a workpiece. Also called the parallel orientation.
bar stockRaw material purchased from metal manufacturers in the form of long bars. Bar stock may be round, square, or hexagonal.
bar stock magazineA chamber that allows the feeding of bar stock, one at a time, into a machine.
boringThe process of using a single-point tool to enlarge a preexisting hole.
bushingA guide for bar stock on the Swiss-type single-spindle screw machine that enables the creation of very small parts with excellent tolerances.
camA circular or cylindrical machine component that converts rotational movement into linear movement. A cam controls the feed rate and depth of cut of cutting tools on the automatic bar machine.
chipAn unwanted piece of metal that is removed from a workpiece. Chips are formed when a tool cuts or grinds metal.
chuckA device that holds a workpiece in place as it rotates. The chuck commonly has three or four jaws that can be adjusted to fit various sizes of parts.
chucking machineA general name for any lathe that uses a chuck to hold the part. An operator must load and unload each individual workpiece.
CNC turning centerA sophisticated CNC machine that specializes in turning, boring, drilling, and threading operations, all at the same location.
colletA slitted device that holds a workpiece in place as it rotates. A collet has a hole through which the workpiece passes, and it is designed to hold specific dimensions. Collets can also be used to hold cutting tools.
computer numerical controlA sophisticated machine tool that uses a computer and special programs to carry out various machining operations. The turning center is an example of a lathe equipped with computer numerical control (CNC).
cross slideOn a lathe, the tool-holding components that allow tools to approach a workpiece from a perpendicular, or radial, orientation.
cutoffAn operation performed on the lathe that uses a cutting tool to separate a finished part from the rest of the stock.
cycle timeThe time it takes to make one part.
depth of cutThe amount of material that is removed with one pass of a cutting tool.
drillingThe process of using a multi-point tool to penetrate the surface of a workpiece and make a round hole.
drive shaftLocated in the base of a turning machine, the device that transfers power from the motor to all machine components.
engine latheThe original and most basic type of lathe.
facingAn operation performed on a lathe that feeds a single-point tool across the end of a cylindrical workpiece to create a flat surface.
feedThe linear movement of a cutting tool into a part to remove material.
followerA machine component that traces the outline of a cam and thus controls the way a workpiece is cut.
form turningAn operation performed on a lathe that feeds a tool into a workpiece in order to impart the tool's shape in the workpiece.
headstockThe end of a lathe that holds the spindle and the drive that rotates the workpiece.
horizontal axisAn imaginary line that passes through the center of an object and is parallel to the floor.
ID groovingThe process of cutting an internal channel or passageway into a drilled hole.
indexThe changing of machine components to a different position.
inner-diameter operationA cutting operation that takes place on the interior surface of a cylindrical workpiece.
latheA machine tool commonly used to create cylindrical parts. A lathe holds a cylindrical workpiece on one or both ends. The cutting tool is gradually passed along the surface of the rotating part.
machine motorThe primary source of power that is located in the base of a lathe.
mechanical safety clutchA safety device that disengages the drive shaft from the motor.
multiple-spindle screw machineAn automatic bar machine that contains more than one spindle, usually 4, 6, or 8. Multiple spindles allow multiple tools to cut multiple workpieces simultaneously.
OD chamferingAn operation performed on a lathe that feeds a tool to create an angled edge on the workpiece.
OD threadingAn operation performed on a lathe that cuts a long, spiraling ridge down the outer surface of a workpiece.
outer-diameter operationA cutting operation that takes place on the outer surface of a cylindrical workpiece.
radial approachA tool approach that runs perpendicular to the axis of a workpiece. Also called the perpendicular orientation.
reamingThe process of using a multi-point tool to smooth the interior surface of a hole.
screw machineAn automated turning machine that continuously creates a number of finished parts from bar stock. Bar stock advances through the spindle and is held by a collet. It is also commonly called a bar machine.
setupTime that is spent setting up the fixtures and tooling, calculating tool offsets, and performing all the necessary tasks to produce the first accurate part.
single-point cutting toolA cutting tool that uses a single cutting edge to remove material.
single-spindle screw machineAn automatic bar machine that contains one spindle. The spindle rotates one piece of bar stock, which is cut by one tool at any given time.
spindleThe part of the machine tool that spins. On a screw machine, the spindle holds the workpiece.
Swiss-type single-spindle screw machineA modified automated turret lathe distinguished by a sliding headstock and fixed bushing. Swiss-type machines are capable of creating very small parts with excellent tolerances.
tailstockA device located at the end of a lathe opposite the headstock that supports the end of longer workpieces.
taper turningAn operation performed on a lathe that feeds a tool at an angle to the length of the workpiece in order to create a conical shape.
tappingThe process of cutting internal threads in a workpiece with a multi-point tool.
toleranceAn unwanted but acceptable deviation from a given dimension. Tolerances indicate the allowable difference between a physical feature and its intended design.
turningA machining operation used to make cylindrical parts. A single-point cutting tool passes along the outer surface of a cylindrical workpiece as it rotates and gradually removes a layer of material.
turretThe component of a lathe that holds a number of cutting tools. The turret rotates to place tools in the cutting position.
turret latheA lathe with a mounted device that holds multiple cutting tools. The turret rotates to position one specific cutting tool in place after another.
vertical turning machineA turning machine in which the spindle is perpendicular to the ground floor. Vertical turning machines are often used for very large or heavy parts.
workholderA device used to locate and hold a workpiece in place.

This technical information has been contributed by
Pacific Swiss & Manufacturing, Inc.

Click on Company Name for a Detailed Profile


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