dml midterm

lab tools, hw1, hw2, safety, etc.

tap

creates internal threads

tap handle

holds the tap so toque to be applied

tap guide (spring loaded)

holds tap perpendicular to workpiece

endmill

rotating cutting tool that can cut with it’s end (axially) or side(radially)

center drill

short, still cutting tool that accurately starts a hole

regular drill

rotating cutting tool that only cuts axially (with its end) to create holes

edge finder

locate edges (datums) of part or feature

center finder

locates center of cylindrical parts or features

* pointy, conical tip

reamer

creates extremely accurate holes, used only as final operation after drilling a hole 1/64” away from the final size

countersink

creates conical holes in which flathead screws can sit flush or slightly below surface of part

lathe turning

A metal cutting process used for the generation of cylindrical surfaces. Normally the workpiece is rotated on a spindle and the tool is fed into it radially, axially, or both ways simultaneously, to produce the desired surface. The term, in the general sense, refers to the generation of any cylindrical surface with a single point tool

held in a CHUCK

workpiece clamped in rotary chuck containing 3 or 4 jaws

held in a COLLET

workpiece held in precision cylindrical bushings

held between centers

workpiece is supported between 2 mandrels

True or False: All standard tool holders are designed to cut with the cutting edge or point located on the centerline of the machine and workpiece.

True

define milling

generating machined surfaced by progressively removing a predetermined amount of material or stock from the workpiece

advanced at a relatively SLOW rate of movement or feed to a milling cutter rotating at a comparatively HIGH speed.

end milling

using the end and sides of a cutting tool to create a shoulder or pocket

face milling

using the end or tip of a tool to create a flat workpiece surface (think of when you face a part)

what are most solid milling cutters and drills made of? why?

high speed steel (HSS) because of toughness and cost

workholding device for a milling machine

vise

true or false: majority of holes are produced by drilling

true

lathe operations: knurling

a cross-hatch pattern produced on surface through metal forming

lathe operations: boring

a single-point tool is fed linearly and parallel to the  workpiece axis to enlarge a hole made by a previous process

lathe operations: chamfering

tool cuts the corners of a cylinder at an angle; creating beveled edges

lathe operations: threading

external or internal threads achieved by feeding pointed tool literally across the outside or inside surface of a rotating part

lathe operations: profiling

both modes of tool feed are simultaneously desired to create specific tapered and contoured surfaces

lathe operations: parting

cutting off the end of a part by feeding a tool radially into a rotating workpiece at a specific location along its length.

lathe operations: facing

surface positioned perpendicular to the axis of the workpiece, radial feed dominates

lathe operations: drilling

producing a hole by feeding a drill into a rotating workpiece along its axis

lathe operations: turning

the generation of any cylindrical surface with a single point tool

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the feeding motion is axial with respect to the machine’s spindle.

limit tolerance / dimension tolerance

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unilateral tolerance

\

bilateral tolerance

fit

allowance

clearance fit

interference fit

datum dimensioning

chain dimensioning

1 in to mm

25\.4 mm

1 m to ft

3\.28 ft

1 lb to N

4\.448 N

1 kg to lb

2\.205 lb