Materials
Which of these metals is typically hardest?: Aluminum, Titanium, or Steel.
Steel.
What are the first 5+ digits of pi?
3.14159...
Name three types of 3D printing.
FDM (fused deposition modeling), SLA (stereolithography), MSLA (masked stereolithography), DLP (digital light processing), SLS (selective laser sintering), DMLS (direct metal laser sintering), SLM (selective lase melting), EBM (electron beam melting), MJ (Material Jetting), DOD (drop on demand), and BJ (Binder Jetting).
What is the proper term for making part on a lathe?
Turning.
Floor tape color for walkways and egress routes.
Green.
The toughest of these materials: Carbon Fiber, Aluminum, or Steel.
Steel.
What is the area of a semi-circle?
A=.5(pi)(r^2)
What is the most difficult feature to produce via 3D printing?
Closed internal cavity.
What is the term for the area around a weld?
The heat affected zone.
Floor tape color for workstations, equipment, etc.
Blue.
What are the standard units of Stress and what is the formula? (Provide SI units & Standard units)
Pressure = Force/Area (MPa & ksi)
What is the volume of a cone?
V=1/3(pi)(r^2)(h)
What type of printing is typically the fastest?
FDM
Name three different welding methods.
Shielded metal arc welding (SMAW),"stick welding." Gas tungsten arc welding (GTAW), also known as TIG (tungsten, inert gas). Gas metal arc welding (GMAW), also known as MIG (metal, inert gas). Flux-cored arc welding (FCAW), very similar to MIG. Submerged arc welding (SAW), usually called Sub Arc. Electroslag welding (ESW), a highly productive process for thicker materials.
Floor tape color for PIT equipment.
Orange.
What is cold working? And how does it affect Steel?
Mechanical manipulation/deformation of the material that typically distorts grain boundaries.
In Steel, cold working results in work hardening which makes the metal harder, stiffer, and stronger, but less plastic, and may cause cracks of the piece.
What is the volume of a sphere?
V=4/3(pi)(r^3)
What type of 3D printing provides the best possible surface finish & can produce the smallest features?
SLA/MSLA
What is the colloquial name for 0.001"?
A "thou". Shorthand for a thousandth of an inch.
Floor tape color for emergency equipment.
Red.
What happens to steel when it is annealed and quenched?
Steel recrystalizes during annealing process, releasing internal stresses and normalizing the crystalline structure into a fine lattice.
When the material is quenched (quickly cooled, usually in oil bath) the crystalline structure is "frozen", resulting in a steel which remains very hard and brittle.
Name a way to measure the volume of a highly irregular shape.
If density is known then measure weight. If not, then submerge in fluid and measure increase in fluid level.
What is the name of the piece of material that an FDM printer prints underneath the part?
The raft.
What is the colloquial name for 0.0001"?
A "tenth", shorthand for one ten-thousandth of an inch.
Floor tape color for areas that need to remain free of obstruction.