Term
| What is used to transmit a heavy load between a shaft and pulley? |
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Definition
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Term
| What is the minimum engagement of a screw? |
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Definition
| They have a minimum engagement of 1.5x the diameter of the fastener |
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Term
| What kind of machine screw head style requires a countersunk hole? What is the angle of this countersink? |
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Definition
| Flat Head Screws require a countersunk hole at 82 degrees |
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Term
| What are the 3 standard styles of set screws? |
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Definition
| The 3 standard styles are Cup Point, Flat Point and Cone Point. |
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Term
| Cap Screws are _____ driven. |
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Definition
| Cap Screws are Internally driven |
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Term
| What are half-dog and full-dog set screws used for? |
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Definition
| They are used for alignment between a collar and shaft. |
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Term
| What is the difference between a screw and bolt? |
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Definition
| A bolt requires a mating nut. They also have different application. |
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Term
| What do the numbers indicate on metric bolts and screws? |
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Definition
| The last two numbers indicate the yield point which is a percent of the ultimate tensile strength. The first number(s) designate the ultimate tensile strength. |
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Term
| What style of self locking washer has a higher holding power? What are some downsides? |
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Definition
| The external self locking washer has more holding power than the internal equivalent. The downside is the external has reduced appearance, can snag and may be a safety concern. |
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Term
| What is the purpose of flat washers? |
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Definition
| To distribute pressure, protect a surface from wear and to act as a spacer. |
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Term
| How are woodruff keys identified? |
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Definition
| With a 3 or 4 digit number. The last two digits give the nominal key diameter in eights of an inch and the first digits give the width in 32nds of an inch. Example : a 1418 woodruff key would be 14/32" width and 18/8"(2 1/4") diameter. |
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Term
| A dowel pin is made of _____ steel, and is ground to ______ inch over it's nominal diameter. |
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Definition
| A dowel pin is made of hardened steel, and is ground to 0.0002 inch over it's nominal diameter. |
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Term
| What makes a Pratt and Whitney key easier to align the hub and the key? |
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Definition
| The rounded ends help with this. |
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Term
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Definition
| A key is used to mate a hub with a shaft. It's purpose is either to align or be a shear point. |
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Term
| What are cotter pins used for? |
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Definition
| They are used to keep other fasteners in place. |
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Term
| How much over nominal size are radial locking/spring pins? |
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Definition
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Term
| Before installing retaining/snap rings what should you refer to? |
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Definition
| You should refer to manufacturing specifications. |
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Term
| What are snap/retaining rings used for? |
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Definition
| Snap/retaining rings provide a removable shoulder to locate, retain or lock components accurately;y on shafts, bores and inside housings. |
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Term
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Definition
| For safety and when appearance is important. |
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Term
| What type of Nuts require cotter pins to lock them in place? |
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Definition
| Hex Castle and Hex Slotted(Standard, Thick Slotted & High Slotted) |
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Term
| Machine Screws are rarely more than ___ in diameter |
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Definition
| Machine Screws are rarely more than 1/4" in diameter |
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Term
| What is the purpose of a dowel pin? |
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Definition
| They are used to align parts during assembly. They are not meant to hold them in place. |
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Term
| What is the relation to the grade of a bolt/screw to the number of lines on the end? What grade is an exclusion to this rule? |
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Definition
| For every line on the end of the bolt/screw add 2 to that number and you will have the grade of bolt. (i.e. 5 marks is a grade 7, 3 marks is a grade 5) The exception to this rule is a grade 3 bolt as it only has 2 marks and a bolt with no marks has a grade of 1. |
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Term
| What type of head is common in woodworking/sheet metal? |
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Definition
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Term
| What shape is a Pratt & Whitney key? |
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Definition
| It is a key with rounded ends. |
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Term
| How are tapered pins sized? |
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Definition
| They are sized by the length and the major diameter. |
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Term
| What do cotter pins work with? |
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Definition
| They work with clevis pins, castle nuts and slotted nuts. |
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Term
| What is the OD of a #6-28 UNC Machine Screw? |
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Definition
OD = # x 0.013 + 0.060
OD = 6 x 0.013 + 0.060
OD = 0.138" |
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Term
| What key is used on the end of a shaft? |
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Definition
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Term
| What is the taper of a tapered dowel pin? |
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Definition
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Term
| What is the taper of a gib-head key? |
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Definition
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