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ASM Block 8 (R)
| Question | Answer |
|---|---|
| How i | |
| How is fluid flow increased on the HVLP gun? | By turning the fluid flow screw Counter Clockwise |
| air at the tip of the nozzle will not be used above what PSI? | 10 |
| The nozzle assembly consists of what? | Air Cap & Fluid Tip |
| Fluid Tip & Fluid Needle should come how? | As a matched set with the same exact diameter |
| Why must the flow of air and fluid at the gun be adjusted? | To obtain proper atomization |
| Spraying in a horizontal movement, wings on the nozzle are in what direction? | Vertical |
| When changing from a vertical to a horizontal pattern, the air cap must be rotated how many degrees? | 90 |
| When cleaning a spray gun, you should have a face shield, goggles and what else? | Respirator, Acid Apron, Rubber Gloves |
| Never leave a spray gun immersed in thinner or it may damage what? | Non-Metallic parts |
| What is the disadvantage of using a suction or gravity fed HVLP gun? | Capacity of the fluid container |
| Spray Pattern Defects: Result of moisture condensation from the atmosphere within or on a drying organic film. | Blushing |
| Spray Pattern Defects: Takes on a prune-like skin effect. Its a combination of the coats being applied too thick, too fast, or in extreme humidity or a rise in temperature. | Wrinkling |
| Spray Pattern Defects: Caused by adverse weather and humidity, and may cause an application method to be unworkable. | Unusual Climatic or Atmospheric Conditions |
| Spray Pattern Defects: Caused when your gun is not clean. Clogged wings on an air cap, dirt or a burr on the air cap or fluid seat | Heavy Top or Bottom and Heavy Right or Left |
| Spray Pattern Defects: Buildup of too much paint in the center of the pattern. | Heavy Center |
| Spray Pattern Defects: Occurs when the atomizing pressure is too high, or when you are attempting too wide of a pattern with insufficient fluid mix. | Split Spray |
| Appears as a pebble effect and resembles the skin of an orange. If you use the wrong air cap or fluid nozzle | Orange Peel |
| Generally caused by not not overlapping and not maintaining 90 degrees to the surface. | Streaks |
| If you hold the gun too close to the surface, if you don’t release the trigger at the end of the stroke | Runs and Sags |
| Paint Terminology: Scuff sanding parts before priming and anytime the 24 hour painting sequence is broken | Adhesion |
| May be either organic or synthetic, may be mixtures of many things including vehicles and pigments. | Coating/Paint |
| The liquid portion of the coating. The most important part of the coating, and consists of volatiles and non-volitiles | Vehicle |
| Referred to as solvents, diluents, and thinners. Solvents are added at the manufacturer, thinner is added by the painter to reduce the viscosity. | Volitiles |
| Forms the actual film on the surface. Are binding agents in the cured organic film. Consists of drying oils, resins, and plasticizers. | Nonvolatile |
| Fine solid particles, provide color, film and ultra-violent ray protection. May be natural or synthetic. Generally heavier than liquids and they sink to the bottom. | |
| When the appropriate catalysts are added, the fluid turns into a solid form. | Resins |
| These are added to resins to cause a chemical reaction which cures polyurethane and epoxy coatings. | Catalysts |
| Must be accomplished just before coating the application. Each time the coating sequence is broken (8 hours) you must re-activate the primer. | Solvent Wipe |
| Fluids internal resistance to flow. Low viscosities are thin. Higher viscosities are thicker. Too low viscosity fluids will lead to runs and sags. Too high viscosities may cause orange peel effects or excessive film thickness | Viscosity |
| A device that measures viscosity directly from its containers. | #2 Zahn Viscometer Cup |
| What is a Backup to the #2 Viscometer Cup? | #4 Ford Cup |
| Pigments | |
| What are the two different types of spray booths? | Partially Enclosed, Fully Enclosed |
| Minimum Cure Times @75 Degrees F: Before Handling, Taping, Masking? | 6 Hrs |
| Minimum Cure Times @75 Degrees F: Before Movement from a controlled environment? | 6 Hrs |
| Minimum Cure Times @75 Degrees F: Before application of decals? | 8 Hrs |
| Minimum Cure Times @75 Degrees F: Before engine run up? | 30 Hrs |
| Minimum Cure Times @75 Degrees F: Before wet tape test? | 48 Hrs |
| Minimum Cure Times @75 Degrees F: Before first flight? | 72 Hrs |
| Minimum Cure Times @75 Degrees F: complete leading edges, complete control surfaces, major skin panels 9 square feet and over, and engine intake? | 72 Hrs minimum |
| Minimum Cure Times @75 Degrees F: Skin panels less than 9 square feet, fasteners, rivet heads, screw heads, and minor chipped and scratched areas less than 36 square inches? | 30 Hrs minimum |
| How often should you clean your HVLP spray gun? | After each use |
| When is the only time a HVLP spray gun should dismantled? | When a proper spray pattern can not be produced |
| If applying a second coat of paint, how should the second coat be applied? | Crosswise or perpendicular to the first coat |
| Never mix more product than can be used in what hour period? | 4 Hr |
| When mixing, how long should the resin be agitated? | 3-5 min |
| When breaking down the coating paint #: What does the first digit represent? | The paint’s glossiness |
| When breaking down the coating paint #: What does the second number represent? | The paint color |
| When breaking down the coating paint #: What do the last three numbers represent? | The shade |
| What T.O. Will give you the color number and paint scheme for the aircraft? | -23 |
| After the primer has been applied, how long should you wait before applying the topcoat? | 5-8 hours after primer has been applied |
| After the topcoat has been applied, how long should you wait to scuff sand the entire surface? | 24 Hrs |
| What viscosity does the Zahn Cup require? | 17-23 seconds |
| What viscosity does the #4 Ford Cup require? | 18-29 seconds |
| The Air Force requires that a paint job on an aircraft generally last how long? | 5-8 years |
| If the primer has been sitting longer than 8 hours but less than 24 hours, what would you need to do? | Re-activate the primer with an approved solvent |
| If the primer has sat for more than 24 hours what must be done? | All primed surfaces will be required to be scuff sanded |
| What is a Tack Rag? | An aircraft wipe dampened with solvent |
| It is the Air Force’s policy that all aircraft be painted to meet three primary goals. What are these three goals? | Appearance, Corrosion protection, and survivability |
| A well maintained spray booth will provide positive results on a continuous basis with simple day-to-day __________ and __________. | Cleaning, maintenance |
| This is a draft gauge that indicates when paint arrestor filters or intake filters are filled to capacity, restricting air flow. (Filters need to be replaced) | Manometer |
| What unit automatically provides make-up air to eliminate problems of air deficiency and airborne contaminates? | Air replacement Unit |
| What removes overspray from the spray booth area by pulling air through filters/baffles? | Exhaust Fan |
| This term is used to describe the speed of air moving through the empty spray booth. | Air velocity |
| How many FPM’s are typically drawn out of most spray booths? | 100 FPM |
| This type of spray booth draws contaminated air through a series of baffles or filters before exhausting it to the outside. | Dry Filter |
| What are the two different designs of spray booths? | Partially Enclosed, or Fully Enclosed |
| What kind of air does a Partially Enclosed booth have? | Cross Flow |
| What kind of air will you find in an Enclosed spray booth? | Cross Flow, or Downdraft |
| These are used for volume painting such as total aircraft painting. | Pressure Pots |
| How much volume can a Pressure Pot hold? | 2 quarts to 120 gallons |
| On a pressure pot, what is another name for all the gauges and line connections? | Material regulator |
| What are the two ways to power a paint agitator? | Electrically, or pneumatically |
| When using a spray gun with a pressure pot, what are the two different types of pressure pots that can be used? | Attached, seperate |
| What are two things that might cause a spray gun to start sputtering? | Loose connections, or the fluid tube or packing needle |
| What can cause the spray gun to leak? | If the packing for the needle is dry or the nut is too tight, or if the fluid tip is damaged |
Created by:
Tphan4462
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