|
Click on links below to enter your destination.
Home
Up
| |
STUDY GUIDE Exam #2
Dimensioning
-
What is the purpose of dimensioning? Dimensions allow
you to __ the product.
-
What are the two types of dimensions? Dimensions of __
& __.
-
Where are dimensions placed? __ views and __ the
views.
-
What spacing for dimensions is conventional? Dimension
lines __ from the object, __ gap between the extension lines & feature,
__ overhang past arrowhead.
-
Know the rules of dimensioning, i.e. Holes dimensioned by
their __ and arc by their __, and do you dimension hidden line features?
-
Are dimension lines thick or thin, light or black?
-
What other lines can extension lines cross?
-
What lines should extension lines not cross?
-
Know the difference between aligned and unidirectional
systems.
-
Know the difference between general practice and structural
practice of dimensioning.
-
What is a datum?
-
Know the difference between cumulative and coordinate
dimensioning.
Tolerance
-
Know the difference between allowances and tolerances.
-
Know the meaning of normal and basic size.
-
Know the three classes of fit.
-
Which class of fit requires selective assembly?
-
Interchangeable assembly is used for __ & __ fits.
-
In the case of the basic hole system, the basic size is
assigned as the __ hole.
-
In the case of the basic shaft system, the basic size is
assigned to the __ shaft.
-
Know how to use the tables in the appendix to calculate
tolerances, i.e. RC1 .
-
Know the differences between positive and negative
allowances.
-
Know how to determine minimum and maximum allowances.
Section Views
- Know the purpose for creating a section view.
- What is the major distinguishing feature of a section view.
- Is crosshatching (section lining) thin & black or thick & black?
- What is the usual place ( pitch) between the crosshatched lines?
- Is crosshatching always at 45 degrees?
- Which items are usually not crosshatched?
- How is the cutting plane line drawn and what is its purpose?
- What do the arrowheads on the end of a cutting plane indicate?
- Are section views drawn exactly as though the object were cut apart?
- An object that appears as though it was cut in half is called a __
section.
- Are hidden lines usually drawn in section views? If not why not?
- An object that appears as though 1/4 was removed is what type of section?
- An object with the section cut all the way across the object, but in an
irregular route to reveal more features is called a __ section.
- What type of object is best to draw as a half section? When its
shape is __.
- What is the typical purpose of revolved sections?
- How much is the axis rotated for a revolved section? __ degrees.
- What is the difference between revolved and removed sections?
Shop Processes
- Which is stronger, a casting or a forging? What is the difference?
- Know the difference between counter bores, counter sinks, spot faces,
taps, dies, drilling, reaming.
- Which is smoother, a drilled hole or a reamed hole? Why?
- Study the glossary of terms in appendix A-7 if you are using the
Lamit text.
Threads & Fasteners
- Know the terms including major diameter, minor diameter, thread angle,
root, crest, lead, pitch.
- Which thread form is common for most bolts in the US.?
- Know the difference among blots, cap screws, machine screws, set screws,
and studs.
- Understand and recognize a schematic representation of a thread.
- Understand the meaning of a thread notation, such as 1/4-20 UNC 2A
- Know which is the major diameter, threads per inch, the thread form, the
series, the class of fit, and weather the thread is male or female.
- Understand the purpose for multiple lead screws and right or left hand
threads.
|
