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AGM 2050 Exam 1
What is the importance of plans and drawings? - correct answer ✔✔1. communication between designer and fabricator
- useful in troubleshooting problems
- make cost estimations faster and more accurate
- reduction in waste generation from a particular job What are the differences between sketches and drawings? - correct answer ✔✔drawings: carefully drawn with drawing instruments, for larger more complicated projects, drawn to scale with dimensions and different views sketches: rough outline of object (generally free hand), generally for small and simple objects, not usually drawn to scale used for drawing or measuring angles - correct answer ✔✔protractor allows inclined lines to be drawn of any angle divisibly by 15 - correct answer ✔✔triangles used to draw circles, arcs, and ellipses - correct answer ✔✔compass allows the size of the object to be reduced proportionately - correct answer ✔✔scales to layout 90 degree lines on drawing - correct answer ✔✔T-square left and right-hand edges must be straight so blade of square will form a true right triangle - correct answer ✔✔drawing board used for measuring and transferring distances - correct answer ✔✔dividers
to frame drawing, usually 1/2" from edge of paper - correct answer ✔✔border line to show visible edges of drawing - correct answer ✔✔object line to show hidden edges on drawing - correct answer ✔✔hidden line used to indicate the dimension and location - correct answer ✔✔dimension line to indicate a break in the drawing - correct answer ✔✔break line shows centers, typically used for drawing circles - correct answer ✔✔center line used to insert a comment on a drawing - correct answer ✔✔leader line What type of letters should be used on drawings? - correct answer ✔✔capital letters with consistent sizes; keep lettering outside edges of drawing 2-d head-on view of each side of object - correct answer ✔✔orthographic or orthographic projection 3-d view with a vertical axis and the two other axes at 120 degrees from the vertical - correct answer ✔✔isometric pictorial 3-d view with a vertical and horizontal axis and the third axis at an angle to the horizontal - correct answer ✔✔oblique pictorial what lumber size should be used in drawings? - correct answer ✔✔actual size what lumber size should be used when determining a bill of materials? - correct answer ✔✔nominal size
what is the cutting angle for a plane iron - correct answer ✔✔concave, 29 degree angle what is the cutting angle for mower blades - correct answer ✔✔straight, 45 degree angle what is the cutting angle for scissors and snips - correct answer ✔✔concave, 80 degree angle what is the cutting angle for a twist drill - correct answer ✔✔straight, 120 degree angle what is the cutting angle for a wood chisel - correct answer ✔✔concave, 25 degree angle what is the calculation for the circumference of the grinding wheel - correct answer ✔✔pi * D number of lineal feet of grinding wheel surface that pass tool rest per minute - correct answer ✔✔rim speed what is the calculation for rim speed - correct answer ✔✔RS = C X RPM what four things must be considered when selecting a grinding wheel? - correct answer ✔✔size of wheel, type of abrasive, size of abrasive, type of bond what are the main natural abrasives? - correct answer ✔✔flint, garnet, emery, diamond characteristic of flint - correct answer ✔✔as hard as quartz but tougher characteristic of garnet - correct answer ✔✔harder than flint characteristic of emery - correct answer ✔✔almost as hard as diamond and brittle
characteristic of diamond - correct answer ✔✔hardest Earth mineral what type of abrasive is rarely used for grinding wheels anymore? - correct answer ✔✔natural abrasives what does the type of abrasive on a grinding wheel determine? - correct answer ✔✔the grade of the wheel what are two examples of artificial abrasives for grinding wheels - correct answer ✔✔aluminum oxide and silicon carbon characteristics of aluminum oxide - correct answer ✔✔steel grinding applications characteristics of silicon carbide - correct answer ✔✔nonferrous (e.g. Al) and carbide grinding what does a large grit number/grain size indicate? - correct answer ✔✔larger grit number - smaller particle size what does the grit number represent - correct answer ✔✔the number of pores per inch on sieve what is the scale for size of abrasiveness - correct answer ✔✔0- what size of abrasive is used for most general purpose grinding - correct answer ✔✔12- what abrasive would be used for sharpening fine-edge tools - correct answer ✔✔100- what does the type of bond on a grinding wheel determine - correct answer ✔✔the maximum RPM of the wheel what is a bond on a grinding wheel - correct answer ✔✔the "glue" that holds the grains together
what grade should be sued for slower cutting, longer wheel life, better finish, more chatter, softer metals, slower stock removal, and narrow surface contact? - correct answer ✔✔harder grade wheel which grade wheel should be used when needing cool grinding? - correct answer ✔✔harder grade stone why do you dress a grinding wheel - correct answer ✔✔to maintain balance, reshape straight edge, and remove glaze how do you dress a grinding wheel - correct answer ✔✔use wheel dresser with back and forth movements and check for squareness what tool is #3 on the top 10 list for dangerous tools - correct answer ✔✔angle grinder how do you sharpen convex edges - correct answer ✔✔move tool up and down and side to side to give rounded cutting edge; stop downward motion when sparks appear over cutting edge; complete sharpening on whetstone how do you sharpen knives - correct answer ✔✔use of wetstones or knife sharpening sets; do not use a grinder how do you sharpen concave edges - correct answer ✔✔transfer the curvature of the wheel to the cutting edge; never grind flat side of edge; remove burrs on whetstone how do you reshape a screwdriver - correct answer ✔✔square off edge and sharpen sides what are the two shapes a wood chisel can be - correct answer ✔✔concave to shape of grinding wheel or flat what is the proper length of the bevel on a wood chisel - correct answer ✔✔twice the thickness of the chisel or if too long can be used for cutting soft wood
how do you sharpen a spade bit - correct answer ✔✔with a flat file to restore broken or dull cutting edges how do you properly clean tools - correct answer ✔✔with wet/dry 600 grip sandpaper (removes rust without scratching); light coat of machine oil on metal parts; varnish/paint wood resistance to deformation (esp. denting) - correct answer ✔✔hardness likeliness to break when subjected to pressure - correct answer ✔✔brittleness ease in which it can be drawn out or hammered thin - correct answer ✔✔ductility measure of how much it will stretch - correct answer ✔✔percent elongation shock resistance (ability to absorb energy before cracking) - correct answer ✔✔toughness removal of material by mechanical action by liquid, solid, or gas - correct answer ✔✔wear power to resist strain or stress - correct answer ✔✔strength resistance to stretching forces - correct answer ✔✔tensile strength resistance to squeezing forces - correct answer ✔✔compressive strength resistance to eccentric forces - correct answer ✔✔shear strength resistance to yielding (repeated loads) - correct answer ✔✔fatigue strength resistance to shock - correct answer ✔✔impact strength
the way molecules are arranged in substance (generally geometrically symetric) - correct answer ✔✔crystal structure the mixing of molten metals - correct answer ✔✔fusion heating medium or high-carbon steel to cherry red and cool it rapidly in water - correct answer ✔✔hardening iron containing up to 2 percent carbon - correct answer ✔✔steel obtaining desired hardness and toughness in a metal - correct answer ✔✔tempering what are the 4 main processes of manufacturing steel - correct answer ✔✔bessemer furnace, open hearth furnace, electric furnace, oxygen furnace what is the effect of adding chromium to steel - correct answer ✔✔makes alloy hard, increases wear resistance, rust resistance, >4% chromium - stainless steels what is the effect of adding sulfur to steel - correct answer ✔✔0.15% to aid in machinability what is the effect of adding silicon to steel - correct answer ✔✔5% to improve electrical, mechanical, and thermal properties what is the effect of adding nickel to steel - correct answer ✔✔8-25%; increases toughness and strength of steel what is the effect of adding vanadium to steel - correct answer ✔✔increases strength of steel what is the effect of adding tungsten to steel - correct answer ✔✔used for tool steels; maintain cutting edge at high heat
what is the effect of adding aluminum to steel - correct answer ✔✔provides hardened surface what is the effect of adding molybdenum to steel - correct answer ✔✔increases hardness and endurance, contributes to deep hardening, corrosion resistance what is the effect of adding oxygen to steel - correct answer ✔✔forms rust with iron (iron oxide), not desirable, makes welding difficult what is the effect of adding phosphorous to steel - correct answer ✔✔found in all steels, considered an impurity at > 0.05%; improves machinability what are the four basic metal classifications - correct answer ✔✔ferrous metals, non-ferrous metals, ferrous alloys, non-ferrous alloys main ingredient is iron; pig iron, cast iron, wrought iron, steel - correct answer ✔✔ferrous metals liquid pure iron produced in a blast furnace; so hard and brittle that its almost useless; used to make wrought iron and steel - correct answer ✔✔pig iron made by remelting pig iron and pouring into castings; brittle, greatest resistance to corrosion (of ferrous metals) - correct answer ✔✔cast iron made by mixing pig iron with slag, which contains silicates; slag fibers are distributed throughout, giving high resistance to corrosion and fatigue - correct answer ✔✔wrought iron which of the following is strong, hard, elastic, tough, durable, corrosion resistant, and used in the manufacture of tool steel, springs, cables, axles, shafts, and armor plate? - correct answer ✔✔nickel steel Under which classification would aluminum fall? - correct answer ✔✔non-ferrous metal
When securing a hammer head to its handle, what is the best way to orient the wedges used? - correct answer ✔✔a wooden edge parallel with the hammer head, with metal wedges perpendicular to the hammer head Which of the following statement(s) is (are) true if the bevel on a wood chisel is too long? Select all that apply. - correct answer ✔✔Cutting edge is likely to nick and/or dull easily. May be preferred when cutting soft wood, such as pine. In sharpening a wood chisel, how many times the thickness of the blade should the length of the bevel be? - correct answer ✔✔2x According to its space lattice, which of the following metals would be most similar to lead? - correct answer ✔✔Nickel Which of the following is not an effect of adding carbon to steel? - correct answer ✔✔decreases tensile strength If you wanted to bend a standard box wrench, which of the following would you need to do first? - correct answer ✔✔anneal the wrench Which of the following is strong, hard, elastic, tough, durable, corrosion resistant, and used in the manufacture of tool steel, springs, cables, axles, shafts, and armor plate? - correct answer ✔✔nickel steel Which of the following screws has a pitch of 13 threads per inch (t.p.i.)? - correct answer ✔✔1/2" NC Which of the following file shapes would be most useful in removing material from square inside corners? - correct answer ✔✔triangle T/F A claw hammer should be used to strike a center punch when marking the center of a hole. - correct answer ✔✔False What size drill bit should be used when tapping 1/2" coarse threads? - correct answer ✔✔27/64"
Which of the following only results when steel is annealed and there is more than 0.83% carbon content? - correct answer ✔✔proeutectoid cementite What step is not involved in heat treatment? - correct answer ✔✔soldering T/F Making an eye is when a hole is punched into hot metal. - correct answer ✔✔False T/F Cutting metal is a cold metalwork process and cannot be done with hot metals. - correct answer ✔✔False What does it mean to "draw out" metal? Select all that apply. - correct answer ✔✔Stretch it T or F Larger grit sizes have larger grit numbers. - correct answer ✔✔False T or F In the SAE numbering system for classifying steel and steel alloys, the last two numbers represent the percentage carbon present. - correct answer ✔✔True T or F The nominal size of lumber is smaller than the actual size. - correct answer ✔✔False T or F If the clearance angle on a twist drill is too small, the cutting lips are more likely to break off. - correct answer ✔✔False T or F The main difference between drawings and sketches is that drawings represent the shapes and sizes of objects, while sketches do not. - correct answer ✔✔False Which valve do you first close when extinguishing the flame on the torch? - correct answer ✔✔oxygen valve on torch body What is the minimum lens shading that should be used for general purpose oxy-acetylene wleding and cutting? - correct answer ✔✔ 4
