What is the primary piece of safety equipment in the machine shop? - Answer - Safety Glasses
What can you do if you wear prescription eyeglasses? - Answer - Wear safety goggles or a full face shield. Prescription safety glasses may also be worn.
Describe proper dress for Machine Shop. - Answe...
what is the primary piece of safety equipment in the machine shop
what can you do if you wear prescription eyeglasses
describe proper dress for machine sho
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DML Test 1 Questions And Answers
What is the primary piece of safety equipment in the machine shop? - Answer - Safety
Glasses
What can you do if you wear prescription eyeglasses? - Answer - Wear safety goggles
or a full face shield. Prescription safety glasses may also be worn.
Describe proper dress for Machine Shop. - Answer - Closed toed shoes, short sleeves,
short or properly secured hair, no rings and wristwatches, shop apron, or a shop coat
with no sleeves.
What can be done to control grinding dust? - Answer - Use of cutting fluid and vacuum
dust collectors.
What hazards exist from coolants, oils, and solvents? - Answer - They may cause skin
rashes or infections.
Describe proper lifting procedure. - Answer - bend knees, squat and lift with your legs,
keeping your back straight.
Describe at least two compressed air hazards. - Answer - Compressed air can propel
chips through the air, implant dirt into skin, and possibly injure eardrums.
Describe good housekeeping procedures. - Answer - Good housekeeping includes:
cleaning up spills, keeping material off the floor, and keeping aisles clear of
obstructions.
How should long pieces of material be carried? - Answer - In vertical position, or with a
person on each end.
List at least five points from the safety checklist for a machine tool. - Answer - Do I know
how to operate this machine? What are potential hazards?
Are all guards in place?
Are my procedures safe?
Am I doing something I probably should not do?
Have I made all proper adjustments and tightened all locking bolts and clamps?
Is the workpiece secured properly?
Do I have proper safety equipment?
Do I know where the stop switch is?
Do I think about safety in everything I do?
What is the difference in a bolt and a screw? - Answer - A bolt goes through parts being
assembled and is tightened with a nut. A screw is used when a part is internally
threaded and no nut is needed.
,How much thread engagement is recommended when a screw is used in an assembly?
- Answer - The minimum recommended thread engagement for a screw in an assembly
is as much as the screw diameter; a better assembly will result when 1.5 times the
diameter is used.
When are class 3 threads used? - Answer - Class 2 threads are found on most screws,
nuts, and bolts used in the manufacturing industry. Studs used on many types of
machines are examples of class 3 fits.
What is the difference between a machine bolt and a cap screw? - Answer - Machine
bolts are not machined to the precise dimensions of cap screws. Machine bolts have
coarse threads, whereas cap screws may have coarse or fine threads. Machine bolts
have many uses in the construction industry, and cap screws are usually used for
precision assemblies.
What is the outside diameter of a No. 8 machine screw? - Answer - D = (number of the
machine screw [8]) x .013in + .060in. So, the outside diameter of a No. 8 screw
is .164in.
Where are setscrews used? - Answer - Setscrews are used to secure gears or pulleys
to shafts.
When are stud bolts used? - Answer - Stud bolts can be used instead of long bolts. Stud
bolts aid in the assembly of heavy parts by acting as guide pins.
Explain the difference between thread forming and thread cutting screws. - Answer -
Thread-forming screws form threads by displacing material. Thread-cutting screws form
threads by cutting grooves and making chips.
Where are castle nuts used? - Answer - Castle nuts can be secured on a bolt with a
cotter pin to prevent their accidental loosening.
Where are cap nuts used? - Answer - Cap nuts are used because of their neat
appearance. They also protect projecting threads from damage.
When is an internal-external-tooth lock washer used? - Answer - Internal-external-tooth
lock washers are used on oversized holes or to provide a large bearing surface.
What is the purpose of a helical spring lock washer? - Answer - A helical spring lock
washer prevents the unplanned loosening of a nut and bolt or screw assemblies.Spring
lock washers will also provide for a limited amount of take-up when expansion or
contraction takes place.
When are dowel pins used? - Answer - Dowel pins are used to achieve accurate
alignment between two or more parts.
, When are taper pins used? - Answer - Taper pins accurately align parts that have to be
disassembled frequently.
When are roll pins used? - Answer - Roll pins are used to align parts. Holes to receive
roll pins do not have to be reamed, which is necessary for dowel pins and taper pins.
What are retaining rings? - Answer - Retaining rings are used to hold bearings or seals
in bearing housings or on shafts. Retaining rings have spring action and are usually
seated in grooves.
What is the purpose of a key? - Answer - Keys transmit the driving force between a
shaft and a pulley.
When is a Woodruff key used? - Answer - Woodruff keys are only used where light
loads are transmitted.
When is a gib head key used? - Answer - Gib head keys are used to transmit heavy
loads. These keys are installed and removed from the same side of a hub and shaft
assembly.
Explain two reasons why flat washers are used. - Answer - Flat washers protect the
surface of parts from being marred by the tightening of screws or nuts. They also
provide a larger contact area than nuts and screw heads to distribute the clamping
pressure over a larger area.
Why is it important to know how to used the arbor press properly and how to setup
pressing operations correctly? - Answer - To use the arbor press without instruction is
unsafe for the operator; also, expensive equipment may be damaged or ruined.
What kinds of arbor presses are made? What makes them different from large
commercial presses? - Answer - Arbor presses are hand powered and can be
mechanical or hydraulic. Large power-driven presses do not provide the "feel" needed
when pressing delicate parts.
List several uses of the arbor press. - Answer - installing and removing mandrels,
bushing, and ball bearings- the shop press is also used for straightening and bending.
A newly machined steel shaft with an interference fit is pressed into the bore of a steel
gear. The result is a shaft ruined beyond repair; the bore of the gear is also badly
damaged. What has happened? What is the cause? - Answer - the shaft has seized or
welded in the bore because it was not lubricated with pressure lubricant.
The ram of an arbor press is loose in its guide and the pushing end is rounded off. What
kind of problems could be caused by this? - Answer - A loose or rounded ram could
cause a bushing to tilt or twist sideways while pressing and thus be ruined. In any case,
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