User:Jstapko/EngLab/toolcerts/LaserQuiz

Laser Cutter quiz

{Which of the materials below are you NOT permitted to cut? -Wood +PVC -Acrylic +Materials for which you don't have an MSDS on hand -Paper
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{How do you check for bubbles in the laser tube cooling water? +Look along the central portion for bubbles or fuzz. -Listen for gurgling sounds from the water outlet tube. +Get a flashlight and check the areas where the electrical connections enter the glass. -Add dye to the water to improve contrast, making the bubbles obvious. +Have an assistant work with you to double check - two people catch more mistakes than one.
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{Why is it important for the cooling system to be working properly? +Electrodes passing through the glass can heat up, expand, and crack the glass at the seal -Heat from the laser can get into the room and reduce the efficiency of the school's air conditioning. +The gas inside the laser tube can get hot, expand, raise the pressure, and ultimately burst the tube, sending little glass pieces everywhere. -It's not, the cooling system is an excuse to add a bunch of neat looking glasswork to impress bystanders
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{How do you make sure that the water pump is running? -Listen for the humming noise. -Look for water movement in the laser tube. +Lift the water outlet tube out of the bucket enough to confirm that water is flowing out of it.
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{What are some functions of air assist? -Keeps focusing lens cool +Helps to cut material more quickly +Moves dust and fumes out more quickly, so they don't obscure the beam +Puts out small fires/suppresses flames +Removes corrosive fumes generated by cutting plastic so they don't damage the lens and mirror
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{how do you adjust the focus lens? -Put the work on the platform, turn on the guide laser, and adjust the lens until the guide laser dot is as small as possible. +Rest the spacer block on the work surface, loosen the thumbscrew to let the air assist nozzle rest on the block, then tighten the setscrew. -Put the spacer block on the work, then lower the lens assembly until the lens sits on the spacer block.
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{What should the air filter control knob be set to when powering up? -Halfway between min and max +Min -Max
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{What should you set the air filter knob to when it is up and running? -Min +The minimum needed to remove the fumes properly -Halfway between min and max -Max
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{How do you verify that the air filter is running? -Feel for air being drawn into the laser exhaust vent -Feel for air coming out of the air filter exhaust +Listen to the top section of the air filter for noise from the motor
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{What are some options for dealing with fire? -Fire hose from outside +Fire blanket, on counter next to laser cutter -Box of limestone powder, on shelf below and behind laser cutter +Fire extinguisher, on floor next to laser cutter +Lab sink, for soaking flaming work in water
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{Why must the fire extinguisher be used only as an absolute last resort, when other efforts have failed to control the fire? -The fire extinguisher is expensive, we don't want to have to buy another one. +Using the fire extinguisher can cause severe damage to the laser cutter, necessitating expensive repairs. -The Carbon Dioxide in the extinguisher contributes to global warming when released. +The fire extinguisher produces so much force that it can blast small, flaming objects across the room, actually making a small fire into a big one.
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{Who must be within 10 feet of the laser cutter when you are using it? -Another member of your team +Any school employee familiar with laser cutter operation and safety -Your professor -Yourself
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{what should you do if your work catches on fire, and the air assist doesn't put it out? -Run around the lab yelling "AAAAGHH! FIRE!" +Hit "Start/Cancel" to cancel printing -Dowse the fire with water using a bucket +Hit"Home" to return the print head to its start position +Open the lid and put the fire blanket on the fire -Squirt the fire with one of the compressed air cans +Use the Lazy-Tongs to manipulate the fire blanket to best cover the fire
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{What are some ways you could use to learn how to use RetinaEngrave? +The FullSpectrum website, where you can get manuals -Ask your professor +Youtube, online forums, other internet resources -Turn on the laser computer and play with the software installed there
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