Math & Measurements
Which is greater?
7/8" or 13/16"
Answer = 7/8"
7/8 = 14/16 > 13/16
This tool is commonly used to make square and miter cuts with a circular blade that has carbide tipped teeth. Over pressure on the blade or cutting too thick of material can chip or break off the teeth.
What is a dry cut saw?
This type of welding power source (welding machine) is usually large, and heavy, due to the size of the step-down transformer required for 60 Hz AC.
What is a "transformer" machine?
How can check if a 2 long components are square to each other (90 degrees) without using an actual square tool.
3-4-5 method
Good 'ol Pythag!
What is the nominal size (diameter) of a 5/16-18 bolt?
5/16 inch
What half of 3/8"?
3/16"
3/8 x 1/2 = 3/16
This hydraulic machine is used to cut sheet metal and plate of various thickness, many have a back-gauge that can be controlled by entering digital numbers on a keypad.
What is a hydraulic sheet/plate shear?
This type of power source is used for GMAW and FCAW
Constant Voltage or CV
What tools can you use to measure the diameter of a large circular or cylindrical part where the end is not accessible?
Use two, 1ft. squares to make a handheld caliper. (Not super accurate! But can get you close)
What type of head markings are found on a US bolt Grade 5 ?
3 embossed lines, 120 degrees apart
Reference: Bolt Depot PDF, on Canvas
What is 7 ft.2 x 3 =
= 21 ft.2
("21 square feet")
7 square feet x 3 = 21 square feet
(no units on the 3)
Which one of our fabrication machines does this model name describe?
Marvel Series 8 Mark II
Vertical band saw
Which adjustable setting on a constant current welding machine relates to the amount of "heat" that gets put into the metal?
Amperage (amps)
List at least 2 reasons to clean up your work area at the end of your shift.
1. Improve safety, less trip hazards
2. Find missing tools/parts/prints etc.
3. Chance to look at equipment, check for damage or missing parts
4. So you don't become the messy shop person
How are bolt lengths usually measured? From where to where?
(Say you bought some 1/4-20 x 3" bolts, what does the 3" represent)
Fastener length is usually measured from where the material is assumed to be to the end of the fastener.
Reference: Bolt Depot PDF, on Canvas
What is 13 x 13 =
= 169
Reference: Times table
or
13 x 13 = 13 x (10+3) = (130) + (39) = 169
This machine is used with a hand drill and large diameter cutting tools to cut circular holes into round tubing.
What is a tube/tubing notcher?
What does GMAW-P stand for?
Gas Metal Arc Welding-Pulse
If tacking up pieces of square tubing, what is the minimum number of tack welds to place quickly so that that part won't shift too much?
3
This common drive type found on screws is abbreviated PH.
What is "Phillips" head screw?
Reference: Bolt Depot PDF, on Canvas
Which formula can you use to find the hypotenuse of a right-triangle, given the other 2 sides.
Pythagorean's theorem
a2 + b2 = c2
c = square root of (a2 + b2)
This common hand-held fabrication tool requires gloves to be worn and features a disc guard and handle. It's used for a variety of uses such as cutting, removing material and smoothing surfaces, depending on the disc.
What is an angle grinder?
Which part of a MIG welding gun does the nozzle rest on?
Insulator
When cutting mitered edge joints for a square or rectangle frame, is it better to cut a little short, or a little long? Why?
Short. Because you can still make it square and easily weld up a small gap. Longer pieces will "push" your frame out of square.
When measuring or talking about US screw or bolt threads, what does TPI stand for?