Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
59 Cards in this Set
- Front
- Back
|
What is another name for basic size |
Nominal size |
|
|
What is nominal size |
The size before any tolerances have been applied The size you would call across the shop or the simple name you would call it. |
|
|
What is tollerance |
The total variation permitted in a single part |
|
|
What are some types of tolerances |
Unilateral (only permitted tolerance in one direction) Bilateral (permitted tolerance in both directions from nominal size) |
|
|
What is mmc |
Maximum material condition is when parts have the most material possible within tolerance. (Smallest hole biggest shaft) |
|
|
What is allowance |
The intentional difference between 2 parts at mmc |
|
|
What is positive allowance |
It is the minimum clearance between 2 parts |
|
|
What is negative allowance |
It is the maximum interference between 2 mating parts |
|
|
What are the 3 types of fits |
Clearance Interference Transition |
|
|
What is it when the shaft always fits into the mating hole |
Clearance fit |
|
|
What is interference fit |
The diameter of the shaft is always larger than the mating hole |
|
|
What is it called when you have both clearance and interference fit possible in the allowance |
Transition fit |
|
|
What are the class of imperial thread fits and what place is it found in the designation |
Class 1 Class 2 Class 3 In the last or 4th place |
|
|
What is an imperial class 1A thread fit |
External thread loose fit |
|
|
What is an imperial class 2B thread fit |
Internal thread commercial fit |
|
|
What is an imperial class 3A thread fit |
External thread high precision |
|
|
What is the 7 in "1 1/4-7 UNC-2A" |
Number of threads per inch |
|
|
What are the imperial thread series most common |
UNC UNF |
|
|
What does the 20 in M 20 x 0.8 mean |
A basic size of 20mm |
|
|
What does the 2.5 mean in M 20 x 2.5 - 5g 6g |
Thread pitch of 2.5 |
|
|
What does the 6g mean in M 20 x 2.5 - 5g 6g |
Crest diameter tollerance |
|
|
What does the 5g mean in M 20 x 2.5 - 5g 6g |
Pitch diameter |
|
|
Is a M 20 x 2.5 - 5g 6g internal or external thread and how can you tell |
External. If it was internal it would have a tolerance grade of G6 G5 (letter number switched and position switched ) |
|
|
What material is HRMS |
Hot rolled mild steel |
|
|
What material is CRMS |
Cold rolled mild steel |
|
|
What is the abbreviation for mild steel |
MS |
|
|
What is the abbreviation for machined steel |
MST |
|
|
What organization is the AISI |
American iron and steel institute |
|
|
What is ANSI |
American National standards institute |
|
|
What is CSA |
Canadian standards association |
|
What are these symbols |
|
|
|
What does ASSY mean |
Assembly |
|
|
What is BC |
Bolt circle |
|
|
What is BCD |
Bolt circle diameter |
|
|
What is BHC |
Bolt hole circle |
|
|
What is the abbreviation for computer aided manufacturing |
CAM |
|
|
What does CBORE mean |
Counterbore |
|
|
What does CHAM mean |
Chamfer |
|
|
What does CL stand for |
Center line |
|
|
What does D or DIA mean |
Diameter |
|
|
What does FAO mean |
Finish all over |
|
|
What does HEX mean |
hexagon |
|
|
What does R mean |
Radius |
|
|
What is TPF |
Taper per foot |
|
|
What is TYP |
Typical |
|
|
What is TR |
Taper ratio |
|
|
What does SYM mean |
Symmetrical |
|
|
What does a number inside the surface finish symbol mean |
How smooth or rough the surface can be |
|
|
What does a number to the left of the surface finish mean |
How much material can be removed |
|
|
What is roughness |
Having irregularity a in the surface |
|
|
Where can you find the revision block |
Close to the title block |
|
|
What information can you get from the revision block |
Revision number Description Who made the change The date |
|
|
What indicates a revision on the drawing |
A number or letter in a circle or triangle corresponding to the revision table |
|
|
What is a dimension in brackets called |
Reference dimensions |
|
|
What are NTS dimensions |
These dimensions are not to scale to the present drawing. |
|
|
When will you find NTS dimensions |
After revisions for example |
|
|
How can you identify NTS dimenstions |
The ~ underneath the dimension Underlined dimension NTS beside the dimension |
|
|
What does A/F mean |
Across flats |
|
|
What do we base allowance on |
MMC of the parts |
