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29 Cards in this Set
- Front
- Back
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4 occassions when to inform NCO of aircraft repair |
Each stage is complete. Schedule specifies close supervision neccessary. Doubts on the method or technique. Discover or suspects a fault. |
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4 reasons for tool control |
Ease of checking/stock take. Means of tracing tools. Minimize risk of tool left on a/c. Ease of checking servicability. |
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When taking machine shop tools to an a/c.. |
Fill out a register of what has been taken . Sighted and signed by NCO. |
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5 things remaining swarf can cause. |
Jammed controls. Corrosion. Blocked lines. Bearing failure. Abrasion. |
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6 swarf control techniques. |
Soles of shoes clean. Overalls clean and pockets empty. Cutting paste instead of spray. Block open areas, pipes, housings. Use vacuum cleaner while machining. Vacuum after machining. |
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Safety and servicing notes are. |
Notes and precautions about the aircraft. For example explosive devices onboard. |
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Prior to working on a/c must report to NCOic to |
Check on required work. Knows you are on the a/c. For tool control. On completion of job. If you have to leave the a/c. |
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3 things to be specifies in order raised before work . |
The a/c being worked on. What is being done including dimensions. IAW with which approved drawing/repair/concession. |
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If a deviation from repair is needed you must. |
Get it approved by engineering authority, becomes concession. |
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On completion of task 4 things must be carried out prior to work area being used. |
Swarf and lubricant removed. Tool control , return and sign off tools. Inform NCOic Sign of work orders and documents. |
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Carrying out insitu a/c repairs you must. |
Read and understand references. Receive work order stating what's required. Have the latest ammendment state of drawing. Have correct tooling. Skill and understanding of what is required. |
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What is EDM electro discharge machining. |
Electric discharge between the tool and work piece submerged in dialectic liquid. |
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Which is positive and which is negative in EDM. |
Work piece is the positive. Tool (electrode) negative. |
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EDM arc non continuous to avoid excessive heat through 2 methods. |
Electrode vibrates up and down, periodically contacting work. Intermittent arc discharge. Tolerances of 0.01mm can be achieved. Expensive and specialized. |
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6 EDM advantages. |
Cuts intricate shapes. Wont distort thin material. No burrs. Cut hard material. Low supervision required. Automatic. |
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7 EDM disadvantages. |
Has a heat affected zone. Must be electrically conductive materials. Slow material removal. Expensive and specialized. Electrodes cant be smaller than 0.1mm. Electrode wear. Difficult forming sharp edges. |
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EDM precautions. |
Correct amperage for electrode. Suitable coolant flow. Earth as close to work as possible. Don't earth through bearings. |
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CNC main advantages |
Complex shapes. Consistantly repeatable. |
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4 CNC ball screw advantage. |
Precise positioning. Less friction, less energy, less wear. Fast movement. Minimal backlash. |
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3 CNC linear guide points. |
Pressurized lubrication. Low friction elements. Fast movement. |
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2 types of CNC coordination positioning |
Absolute. Incremental. |
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9 CNC g codes and meaning. |
G0 -rapid traverse. G01 -feed in straight line. G02 -circular interpolation clockwise. G03 -circular interpolation counter clockwise. G41 -left tool compensation. G42 -right tool compensation. G71 to G87 -Canned cycles. G90 -absolute positioning. G91 -incrumental positioning. |
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CNC codes remaining active. |
Modal codes. Remain active until turned off. |
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5 CNC m codes and meaning |
M0 -stops program. M1 -optional stop. M6 -tool change. M8 -turns on coolant. M9 -turns off coolant. |
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4 other CNC word commands |
S -spinde speed. T -tool number. F -feed rate. N -sequence number. |
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CNC programming sequence |
Begin with a safe start. Measuring units (metric , imperial). Load tool. Coordinate ( incremental, absolute). Notion type (rapid , feed). Spindle start. |
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CNC tool nose compensation and cutter radius compensation are where. |
Tools have to be moved left or right to compensate for radius's. |
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CNC tool offset used for. |
Used for roughing and adjusting component size. |
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CNC canned cycles are |
Preset sequences initiated by single commands , enable faster programming. Eg. roughing ,tapping , hole peck drilling. |
