Engineering Studies Predictions/Thoughts (2 Viewers)

[boatartist]

I also thought it was funny that all of the options for section AA on the gear thing were technically wrong , i don't remember what MC q it was but there was no reason for it to be a revolved section when the section plane already went through a hole, but C was the most correct ig

 

[splatcat]

I also thought it was funny that all of the options for section AA on the gear thing were technically wrong , i don't remember what MC q it was but there was no reason for it to be a revolved section when the section plane already went through a hole, but C was the most correct ig

I didn't think you were meant to section parts of the shaft, so i did the one with the correct hole positions and the shaft unsectioned
EDIT: The teeth that is, the shaft is the entire thing

 

[bigbird102]

I didn't think you were meant to section parts of the shaft, so i did the one with the correct hole positions and the shaft unsectioned
EDIT: The teeth that is, the shaft is the entire thing

I think I put C cause it felt wrong not to section parts, even tho they were separated. Also for the heat treating one, was it mild or medium carbon steel

 

[bigbird102]

I didn't think you were meant to section parts of the shaft, so i did the one with the correct hole positions and the shaft unsectioned
EDIT: The teeth that is, the shaft is the entire thing

The teeth aren’t sectioned at the top

 

[tsswhzl]

I didn't think you were meant to section parts of the shaft, so i did the one with the correct hole positions and the shaft unsectioned
EDIT: The teeth that is, the shaft is the entire thing

The holes are rotated around on a pitch circle diameter and the shaft is unsectioned

 

[bigbird102]

The holes are rotated around on a pitch circle diameter and the shaft is unsectioned

What like the teeth

 

[splatcat]

I think I put C cause it felt wrong not to section parts, even tho they were separated. Also for the heat treating one, was it mild or medium carbon steel

Heat treatment one? Was that the one where you had to choose which row of the table was correct when matching 4 microstructures to the label. I had D? i think. It was the only one that labelled the micro-structure that was 100% pearlite as steel, the other 3 had it as cast iron

 

[bigbird102]

Heat treatment one? Was that the one where you had to choose which row of the table was correct when matching 4 microstructures to the label. I had D? i think. It was the only one that labelled the micro-structure that was 100% pearlite as steel, the other 3 had it as cast iron

No (was D btw), the heat treatment short answer. The one for the gears. I asked chat and they only said two answers. carburising is the best answer but I think induction hardening also works (what I put). I can't remember if it was mild carbon steel or medium carbon steel.

 

[splatcat]

No (was D btw), the heat treatment short answer. The one for the gears. I asked chat and they only said two answers. carburising is the best answer but I think induction hardening also works (what I put). I can't remember if it was mild carbon steel or medium carbon steel.

Oh, that question said mild steel and I did carburising

 

[bigbird102]

Oh, that question said mild steel and I did carburising

what did u guys get for the stress one with the bolts. The second part was prtty easy I think but the first part was a bit confusing cause they gave u the thickness of the plates which doesn't rlly make sense in the context of stress for the gears. I think I ended up just using the diameter for each of the gears and the overall tensile load/3. I can't fully remember

 

[splatcat]

what did u guys get for the stress one with the bolts. The second part was prtty easy I think but the first part was a bit confusing cause they gave u the thickness of the plates which doesn't rlly make sense in the context of stress for the gears. I think I ended up just using the diameter for each of the gears and the overall tensile load/3. I can't fully remember

stress = f/a, f is a third of the number they gave you and a is the cross sectional area of bolt given by (pi*d^2)/4

 

[bigbird102]

stress = f/a, f is a third of the number they gave you and a is the cross sectional area of bolt given by (pi*d^2)/4

what was he 12mm dimension then for? I did the same as u by the sounds of it but why was there the 12mm

 

[splatcat]

what was he 12mm dimension then for? I did the same as u by the sounds of it but why was there the 12mm

To trick you

 

[bigbird102]

To trick you

what did u get for the gear one. like the pulley kinda one. I think i got like 13200 something and 0.45 efficiency I believe.

 

[splatcat]

what did u get for the gear one. like the pulley kinda one. I think i got like 13200 something and 0.45 efficiency I believe.

13200 doesn't sound right, as the load is 12kn. I think I got around 9.4kn and 60 something efficiency I think

 

[splatcat]

You could also do that question graphically

 

[bigbird102]

13200 doesn't sound right, as the load is 12kn. I think I got around 6.4kn and 60 something efficiency
I think u sum forces vertical, finding the normal, then sum forces horizontal with friction force (coefficient of friction times N) and weight force opposing the force of the gear. then as its 40º to the axis u divide the unknown force by cos40.

 

[splatcat]

Did you remember to note that the winch's force is 10 degrees from the incline, since its 40 degrees from the horizontal

 

[splatcat]

Did the graphical just now and it gives me 9.4kn

 

[bigbird102]

Did the graphical just now and it gives me 9.4kn

do u have the original question