Precision Measurement

Measurement

100

List 4 types of micrometers

inside, outside, depth, thread pitch, Vernier, standard

200

List two criteria in how to select the proper size for an outside micrometer, in terms of how they are classified?

range

precision or accuracy

300

Explain the difference between draw filing and cross filing

draw filing, finish filing, hold file in left hand pull towards

cross filing, rough filing, moving file across the work

400

What two ways can surface finish be measured?

profilometer & scratch test

500

Name the parts of the Micrometer

1. Frame

2. anvil

3. spindle

4. lock nut

5. sleeve

6. thimble

7. ratchet

Semi-Precise

100

Semi-precision measurement is defined as?

greater than 1/64, 1/100, 1 degree, .5mm

200

List the names of 5 tools that are used for semi-precision measurement

steel rule, protractor, tape measurer, machinist square, combination set, fillet and radius gages, screw pitch gage

300

What are two major categories that classify hand tools?

cutting and non-cutting

400

List two major safety practices that one must do upon entering a shop environment?

always wear PPE

know where the emergency exits are located

look for any spills or slick spots

beware of lockout/tagged out equipment

500

List two uses of a dial indicator

dialing in a part on the lathe

measuring travel (depth of cut)

measuring runout

Precision

100

Precision measurement is defined as:

smaller than 1/64, 1/100, 1 degree, .5mm

200

List the names of 5 tools that are used for precision measurement

micrometers

calipers

gage pins

gage blocks

height gage, surface plate

thread wires

300

name one reason why industry uses gage blocks?

field check measurement tools, gage block build up

400

List the names of the tools for semi-precise and precise layout.

semi precise (use these tools)

precise (use these tools)

semi precise ( combination square , scribe)

precise (surface plate, sine bar, height gage)

500

How many threads per inch are in a inch micrometer?

Explain why you can prove that?

40 TPI

1/40 = .025, each revolution is .025 

Technical Info

100

Explain each of the following items: (6 points) 1/4-20 UNC RH-1A

1. 1/4-__________________________________________

2. 20__________________________________________

3. UNC_________________________________________

4. RH-__________________________________________

5. 1__________________________________________

6. A_________________________________________

major diameter

tpi

unified national course

right hand

class of fit

external

200

what tool is used in a drill press or mill that removes very little material and maintains a very accurate hole?

reamer

300

define the following terms:

limits and tolerance

limits: maximum & minimum permissible dimension

tolerance: total permissible error

400

Define the following terms:

allowance & fit

allowance: intentional difference in size

Fit: range of tightness between parts (clearance, interference, force fit)

500

What part of the thread profile are you measuring when you use a thread pitch micrometer or thread wires? (minor diameter, major diameter, pitch diameter, root, crest etc)

pitch diameter

Sara's Choice

100

How do machinist refer to the machinery's handbook?

the bible

200

What is Sara's Philosophy about helping students outside of class?

1. Schedule an appointment

2.  She will put as much effort into helping you, as you do yourself

300

A guy was on date with a girl, he was trying to be flirtatious he said baby i run a lathe "Im a machinist, I turn it down and "______  __  _____".

take it off

400

How has the coronavirus pandemic affected the Mexican beer market?

https://www.boredpanda.com/quarantine-coronavirus-jokes/?utm_source=bing&utm_medium=organic&utm_campaign=organic 

500

What temperature do you set your cooker at to heat a bearing to the proper temp?

between porkchop and pancake