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NC
Numerical Control. A form of programmable automation (http://www.jjjtrain.com/vms/glossary_a.html#automation) in which the machine tool is controlled by punched tape (http://www.jjjtrain.com/vms/glossary_t.html#tape). NC code contains a program (http://www.jjjtrain.com/vms/glossary_p.html#part program) of instructions and commands, which consists of numbers, letters, and other symbols. See also CNC (http://www.jjjtrain.com/vms/glossary_c.html#cnc)
CAD
Computer Assisted Design. A computer (http://www.jjjtrain.com/vms/glossary_c.html#computer) based design and drafting tool. See CAM (http://www.jjjtrain.com/vms/glossary_c.html#cam)
CAM
Computer Assisted Manufacturing. In general, CAM uses a computer (http://www.jjjtrain.com/vms/glossary_c.html#computer) to assist in any or all phases of manufacturing. But more specifically CAM in the machine shop deals with automatic programming (http://www.jjjtrain.com/vms/glossary_p.html#program) of CNC (http://www.jjjtrain.com/vms/glossary_c.html#cnc) machinery. See also CAD (http://www.jjjtrain.com/vms/glossary_c.html#cad)

http://www.jjjtrain.com/vms/Media/glossary_c/CAM.gif

Card reader
A machine that reads punched cards into a computer.

http://www.jjjtrain.com/vms/Media/glossary_c/teletype_console.jpg




Center
1) A point around which anything revolves or rotates.
2) In the machine shop this often refers to a centering device usually affixed to the tailstock (http://www.jjjtrain.com/vms/glossary_t.html#tail stock) of a lathe (http://www.jjjtrain.com/vms/glossary_e.html#engine lathe), which is used to support a work piece with a pre-drilled center hole (http://www.jjjtrain.com/vms/glossary_c.html#center drill). The center and the pre-drilled hole have 60 degree (http://www.jjjtrain.com/vms/glossary_d.html#degree) included angles (http://www.jjjtrain.com/vms/glossary_a.html#angle). The center usually has a Morse taper (http://www.jjjtrain.com/vms/glossary_m.html#morse taper) on the opposite end for snug fitting into the tailstock (http://www.jjjtrain.com/vms/glossary_t.html#tail stock). Live-centers have ball bearings (http://www.jjjtrain.com/vms/glossary_b.html#bearing) for rotation. Dead centers do not rotate and require lubrication. The top image is a dead center. The bottom image is a live-center.
http://www.jjjtrain.com/vms/Media/glossary_c/lathe_center_dead.jpg
http://www.jjjtrain.com/vms/Media/glossary_c/lathe_center_live.jpg




Center cutting end mill


An end mill (http://www.jjjtrain.com/vms/glossary_e.html#end mill) that is capable of axial as well as radial cut. Two opposing cutting flutes (http://www.jjjtrain.com/vms/glossary_f.html#flute) are so close together that the mill can act as a drill (http://www.jjjtrain.com/vms/glossary_d.html#drill). Below left is a center cutting end mill. Below right is a hollow coolant (http://www.jjjtrain.com/vms/glossary_c.html#coolant)-flow end mill capable of side cutting but not down cutting.

http://www.jjjtrain.com/vms/Media/glossary_c/center_cutting.jpghttp://www.jjjtrain.com/vms/Media/glossary_c/non_center_cutting.jpg
Chamfer



To bevel an edge. This can be a straight edge, curved edge, or a hole
.http://www.jjjtrain.com/vms/Media/cutting_tools_csink_cbore_spot/csink_green.jpg

Chamfer gage
Tool used to measure the width of chamfers/countersinks (http://www.jjjtrain.com/vms/glossary_c.html#chamfer) at the top of a hole.

http://www.jjjtrain.com/vms/Media/glossary_c/conutersink_gage.jpg
Chuck
Work holding device that is mounted on a lathe (http://www.jjjtrain.com/vms/glossary_e.html#engine lathe)spindle (http://www.jjjtrain.com/vms/glossary_s.html#spindle), drill press (http://www.jjjtrain.com/vms/glossary_d.html#drill press) spindle, or mill (http://www.jjjtrain.com/vms/glossary_m.html#millinf machine)table (http://www.jjjtrain.com/vms/glossary_m.html#machine table) to hold and revolve a work piece or cutting tool (http://www.jjjtrain.com/vms/glossary_s.html).
http://www.jjjtrain.com/vms/Media/glossary_c/chuck.gif



Clamp, edgehttp://www.jjjtrain.com/vms/Media/glossary_c/clamp_edge.gif
An edge clamp is any of a number of different clamps that hold the work piece by “pinching” sideways instead of by tightening downward. The edge clamp shown uses a dovetail arrangement that forces the end piece down a ramp via a socket screw. This closes lateral distance

.
Clamp, radius endhttp://www.jjjtrain.com/vms/Media/glossary_c/clamp_end_radiused.gif
A common strap used as a work holder

Acme
.

An internal or external type of screw thread (http://www.jjjtrain.com/vms/glossary_t.html#thread crest) that has an included angle (http://www.jjjtrain.com/vms/glossary_a.html#angle) of 29 degrees (http://www.jjjtrain.com/vms/glossary_d.html#degree). Acme threads are used on most vertical milling machines (http://www.jjjtrain.com/vms/glossary_m.html#millinf machine) as they are very strong and can compensate for wear. See also unified screw thread (http://www.jjjtrain.com/vms/glossary_u.html#unified), whitworth, (http://www.jjjtrain.com/vms/glossary_w.html#whitworth)American national form (http://www.jjjtrain.com/vms/glossary_a.html#american national form)
http://www.jjjtrain.com/vms/Media/glossary_a/acme.gif

American National Thread Form
An American standard (http://www.jjjtrain.com/vms/glossary_a.html#american standard)thread (http://www.jjjtrain.com/vms/glossary_t.html#thread crest) used in U.S. industry. See also unified screw thread (http://www.jjjtrain.com/vms/glossary_u.html#unified), acme (http://www.jjjtrain.com/vms/glossary_a.html#acme), whitworth (http://www.jjjtrain.com/vms/glossary_w.html#whitworth)
http://www.jjjtrain.com/vms/Media/glossary_a/anf_thread.gif


American Standard Taper Pipe Thread
An American standard (http://www.jjjtrain.com/vms/glossary_a.html#american standard) pipe thread (http://www.jjjtrain.com/vms/glossary_t.html#thread crest) used in U.S. industry.
http://www.jjjtrain.com/vms/Media/glossary_a/tap.gifPipe tap shown


Angle
The space between two lines diverging from a common point and expressed in numerical form. See degree (http://www.jjjtrain.com/vms/glossary_d.html#degree)
http://www.jjjtrain.com/vms/Media/glossary_a/angle.jpg



Automatic bar feeder

A bar feeder that incrementally feeds a single long bar of round stock (http://www.jjjtrain.com/vms/glossary_s.html#stock) through the spindle (http://www.jjjtrain.com/vms/glossary_s.html#spindle) of a CNC (http://www.jjjtrain.com/vms/glossary_c.html#cnc) lathe. A CNC M code actuates the bar feeder directly from the parts program (http://www.jjjtrain.com/vms/glossary_p.html#part program). When one length of bar is used up another is automatically placed in the system.

http://www.jjjtrain.com/vms/Media/glossary_a/auto_feeder.jpg

Axis
A reference line from which distances or angles (http://www.jjjtrain.com/vms/glossary_a.html#angle) are measured in a the Cartesian coordinate (http://www.jjjtrain.com/vms/glossary_c.html#cartesian coordinate system) system. In the picture below these lines are labeled X, Y, and Z.
1) A straight line about which a body or geometric object rotates or may be conceived to rotate. In the picture below the rotational axes are labeled A (rotation about the X axis (http://www.jjjtrain.com/vms/glossary_x.html)), B (rotation about the Y axis (http://www.jjjtrain.com/vms/glossary_y.html)), and C (rotation about the Z axis (http://www.jjjtrain.com/vms/glossary_z.html)).
http://www.jjjtrain.com/vms/Media/glossary_a/axis.jpg
Glossary D Data
For a CNC (http://www.jjjtrain.com/vms/glossary_c.html#cnc) machine tool or a PC (http://www.jjjtrain.com/vms/glossary_p.html#personal computer) data is information in numerical form that can be digitally transmitted or processed. In a statistical sense data is factual information such as measurements used as a basis for discussion or calculation









Datum

A reference point from which movements or measurements (http://www.jjjtrain.com/vms/glossary_m.html#measurement) are made. A datum can lie anywhere on the surface of a work piece. A datum can be a coordinate (http://www.jjjtrain.com/vms/glossary_c.html#coordinate) but does not have to have a physical feature (http://www.jjjtrain.com/vms/glossary_f.html#feature).
http://www.jjjtrain.com/vms/Shared/datum.gif

Depth micrometer
A micrometer used to measure the depth of slots, steps, and other features (http://www.jjjtrain.com/vms/glossary_f.html#feature).
http://www.jjjtrain.com/vms/Shared/depth_mic.jpg


Dial caliper

A caliper (http://www.jjjtrain.com/vms/glossary_c.html#caliper)-like measuring (http://www.jjjtrain.com/vms/glossary_m.html#measurement) device which uses a rack and pinion (http://www.jjjtrain.com/vms/glossary_r.html#rack and pinion) to move an indicator dial. Usually one revolution of the dial denotes .100 inch of movement.
http://www.jjjtrain.com/vms/Media/glossary_r/calipers.jpg



A reference point from which movements or measurements (http://www.jjjtrain.com/vms/glossary_m.html#measurement) are made. A datum can lie anywhere on the surface of a work piece. A datum can be a coordinate (http://www.jjjtrain.com/vms/glossary_c.html#coordinate) but does not have to have a physical feature (http://www.jjjtrain.com/vms/glossary_f.html#feature).

Digital Read Out (DRO)
An electronic instrument consisting of a set of very precise linear scales that are attached to the axis or slides of a machine. Optical readers read positional data and display it digitally.

http://www.jjjtrain.com/vms/Shared/dro.jpg


Dog

A driver that is clamped to a rotating work piece and used to rotate it with the spindle (http://www.jjjtrain.com/vms/glossary_s.html#spindle). Usually driven by a face plate (http://www.jjjtrain.com/vms/glossary_f.html#face plate)http://www.jjjtrain.com/vms/Media/lathe_functions/lathe_dog.jpg.



a twist drill (http://www.jjjtrain.com/vms/glossary_t.html#twist drill) used to make holes.
http://www.jjjtrain.com/vms/Shared/twist_drill.jpg

2) the process of drilling using a drill with two cutting edges ( as a twist drill) to make a hole in firm material..

Drill press
A machine designed to rotate and feed (http://www.jjjtrain.com/vms/glossary_f.html#feed) end-cutting tools for drilling (http://www.jjjtrain.com/vms/glossary_d.html#drill), reaming (http://www.jjjtrain.com/vms/glossary_r.html#reaming), tapping (http://www.jjjtrain.com/vms/glossary_t.html#tap), countersinking (http://www.jjjtrain.com/vms/glossary_c.html#countersink), counter boring (http://www.jjjtrain.com/vms/glossary_c.html#counterbore), spot facing, and boring (http://www.jjjtrain.com/vms/glossary_b.html#boring)operations. Similar to a vertical mill (http://www.jjjtrain.com/vms/glossary_m.html#millinf machine) except the drill press does not have an articulated worktable.
http://www.jjjtrain.com/vms/Shared/drill_press.jpg

Parallels
A set of steel (http://www.jjjtrain.com/vms/glossary_s.html#steel) bodies ground to exact likeness in size and parallelism (http://www.jjjtrain.com/vms/glossary_p.html#parallel). They are often used for machine and inspection (http://www.jjjtrain.com/vms/glossary_i.html#inspection) setups.
greet http://www.jjjtrain.com/vms/Media/glossary_p/parallels.jpgtknk@@
wafk من اخيكم عبدالظاهر

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auto cad

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