09/06/2014 questions

1) What are the S.O.P. for using the lathe? No loose items to be worn, hair tied up and stored under overalls, Make sure the object is properly inserted and locked up before starting, Do not insert your hands near the object when it is sinning.

2) Why is it important to use cutting oil when drilling? The oil helps to lubricate the drill piece as well as help to disperse heat while drilling.

3) What direction do you weld when using a MIG with no flux? left to right.

4) What Volts & Amps do you set the MIG welder to when welding thin metal? 23.5V & 8A

5) What does MIG welding mean? Metal Inert Gas, Using an inert gas means that it will not react with the metal and welding and will keep contaminants out of the weld.

6) What are the tools used to mark the line on the metal? Scriber

7) If you are on 25mm and you make three turns of the thimble, where are you now? 26.5mm

8) What are the five main welds we have done? Butt Joint, Lap Joint, 90* inside, 90* outside, T joint

9) which way do you set the lathe to cut the metal? anti clockwise

10) What colour are the hoses on the gas welding equipment? Red for gas Blue for Oxygen.

Monday 19/05/2014

Why do we use an engineering square?   Engineering squares have a proper 90* right angle on the inside which we use to check if other objects have a right angle and are level.

When we use a lathe do we cut clockwise or anti-clockwise? anti clockwise

why do we centre punch before drilling? without centre punching the object will still be smooth causing the drill piece to slip and slide and not drill. Centre punching will make a small indent for the drill piece to sit in and allow it to drill without slipping.

when making the drill gauge what size drill bit do we use? 4mm, 6mm, 8mm, 10mm, 12mm

what psi/bar do you set the gas welding gauges on? acetylene=3 oxygen=10

What are the S.O.P. for using the drill press?

Why do we us cutting oil when drilling? Cutting oil is used to help lubricate and heat dispersal to keep the drill bit cool and prevent breaking.

When using a micrometer, if it is set to zero & we we turn it two turns on the thimble, what would it be reading? 1mm

What is the difference between fusion and brazing welding? Fusion is where you heat the metal up so much that it starts to liquefy and then you start moving this liquid and meshing them together to bridge the gap. Brazing you heat the brazing rod and dip it in flux. Heat the metal till it is red then start melting the brazing mixture in to fill the gap.

What two files do we use? Bastard (rough) and soft file to clean it off.

What are the five joints we do in the welding? butt joint, lap joint, inside right angle, outside right angle, and ash tray.

What angle is the drill gauge set to? 58*

what is the tool called to set this angle? bevel ruler.

If you cant get a good flame with the oxyacetylene welding, what should you do with the nozzle? Use the pokey rod thingies to poke into the nozzle to clean it.

Which way should the blade be facing on a hacksaw? Facing forward with teethe back towards handle.

Engineering Technology 2014

Inertia starter motor and pre-engage starter motor.

Inertia Starter Motor:

With the inertia starter motors they power was added and the ring gear would spin at full speed. The gear would then spin inwards due to inertia along the grooved lines and hit the flywheels gears at full speed. This was such a harsh event that it would grind, break or mangle the ring gear and flywheel teeth.

Pre-engage starter motor:

when you engage the starter motor the pinion gear gets pushed out onto the flywheel, this step is the stop that violent event of the pinion gear and flywheel meshing. This has the negative effect of the starter needing a lot of power to overcome its own inertia and then the inertia of the motor. 

Ignition circuit diagram

Word search

Electrical Paper Test 2

1. What is the colour of a 10A fuse?  Red.
2. What is the total resistance in the circuit? 12A
3. The fuse is missing from a circuit. How do you measure & workout the correct fuse to replace? Check the fuse box cover. V=IxR  I= V/R. Measure before the fuse box and check with the components Amp rating.
4. What is the total resistance? 7A
5. Customer comes in with the passenger window N/W, What is the correct procedure to take? Measure the voltage at the connection. If good V then put a battery straight to the motor, if it works there must be a bad connection. If no Voltage at the connection, trace back to the switch. If good V at switch check the resistance for voltage drop. 
6. What colour is a 20A fuse? Yellow. 
7. Is the brake light bulb series or parallel? Parallel.
8. How does the central locking work on the front left door? When you lock or unlock the driver door, an electric motor lock or unlocks the passenger door. In the older cars they used vacuum hoses to lock and unlock. When you lock the door the vacuum sucks the lock shut when you unlock the vacuum pushes the lock open.
9.         What does this symbol mean and where would it be found in the car?  Stops the flow of electricity flowing backwards through the circuit and converts AC into DC in the alternator.
10. If a fuse doesnt work, how do you check it out? Get a test light and clip the alligator clip onto an Earth point. Apply power to the fuses, probe the pointy end into the fuses. One side should light up the test light but the other side should remain dead.
11. What is vvvvvvv and where would you find this on a car? Alternator. This is where the rectifier pack converts the AC into DC.
    
12. What Watts is a headlight bulb? This can vary but generally 50W on dip and 70W on high beam.
13. Explain how a relay works including both circuits? A relay is like a switch. When the relay receives low current input it opens or closes a switch which then allows high current to flow through the relay and power up a component. 
14. what is missing? V/   =R    IxR=              V/I=R    IxR=V
15. What is Voltage? Voltage is the strength of electricity flowing through a circuit.
    What is Amps? Amps is the amount of electricity flowing through the circuit.
    What is Resistance? Resistance is the force opposing the flow of electricity.