mac boys Flashcards
What 5 things are Displayed on a Tally Plate?
Safe Working load, date of initial test, part number, serial number of the item, NSN (unit serial number)
List 4 methods of transmitting power.
Mechanical, pneumatics, Hydraulics, Electrically
What are the 5 mechanical methods of transmitting power?
Belts, Chains, Clutches, brakes, Gears
What can Flat belts be made from?
Leather, cotton, Canvas, Rubber
What are the two types of Synchronus belts?
Rounded Teeth, Trapezoidal Teeth
List the 3 types of chains.
Roller, Silent, Detachable link
What are some reasons for using gears rather than chains or belts?
high efficiency, compact reductions can be made, quick speed changes are possible, high load capabilities, positive drive.
list the types of Gears.
Spur Gears, Helical and Spiral gears, Herringbone Gears, Bevel Gears, mitre Gears, Spiral Bevel Gears, Hypoid Gears, internal Gears, Planetary Gears, Worm Gears, Rack and pinon.
what are the 5 ways a shaft can be driven?
Keys, splines, pins, flanges, Couplings (universal, chain etc)
Name the 2 most common types of positive type clutches.
The dog tooth, Spiral Jaw Clutch
Name 4 types of Friction Clutches.
Disk/Slipping Clutch, The cone clutch, radial clutch, Electro magnetic clutch.
what are the advantages of ball scews?
minimal wear due to less backlash, less friction therefore less heat, ease of lubrication, smooth
what are the 2 types of Grinding?
Off Hand, Precision
Give 3 examples of off hand grinding.
tool grinding, general purpose grinding, fettling (grinding casting marks off)
what are the 4 types of grinding wheel abrasives?
Aluminium Oxide, Silicon carbide, cubic born nitride, diamond.
what are the 5 types of bonds do Grinding wheels use?
Vitrified, Silicate, Rubber, Shellac, Resinoid
what does the “24” stand fore in A24-Q5vbe
Grit size
what does the “Q” stand for in A24-Q5vbe
the Grade of the bond
What does the “A” stand for in A24-Q5vbe
Aluminium Oxide
what does the “vbe” stand for in A24-Q5vbe
the type of bond. in this case vitirified.
what are the critical dimensions when ordering a grinding wheel?
the bore of the mounting hole, The overall Diameter, The overall thickness.
Why would a Grinding wheel Glaze over?
wheel too hard, or running too fast. The bond hasn’t released the abrasive partials.
Explain what it means by “A Grinding Wheel Loading”
when the space between the abrasive becomes clogged with swarf, generally this is caused by grinding materials that are too soft for the wheel.
what are the 7 key factors when storing A Grinding wheel?
Store in suitable rack, Wheels shouldnt touch one another, wheels should be chocked, kept out of sunlight and kept dry. do not roll them, do not drop them, visually checked as soon as purchased.
what are the 7 main operations that can be carried out on a band saw?
filing, Sawing, Abrasive Machining, butt welding, grinding, Friction Cutting, pencil Etching.
what 3 cuts does a band saw file come in
single, double and rasp
What shape can a file band be
flat, half round or oval
With regards to a band saw, what 5 parts does the frame contain?
The base, The column, the head, The motor, any coolant supply
what are the two types of guides on a band saw?
Solid Guides, Roller Guides
what are the 4 main factors when choosing a blade for a band saw?
The minimum size of any radius to be cut, the shape to be cut, the material, the thickness of work
