LEAVING CERT DESIGN AND COMMUNICATION GRAPHICS (DCG) 2014

sirwhy · 11-06-2014 3:25pm #1

We already have 40% of our grade, so the focus is on the paper. Anyone have predictions? What did you guys do for Section C?

Huell · 11-06-2014 3:35pm

Hopefully a nice planes and intersecting solids question for section B

Huell · 11-06-2014 7:43pm

Does everyone here have an adjustable set square? I had one and i broke it 2 weeks ago

sirwhy · 11-06-2014 8:50pm

I'm bringing my one. Haven't used it much but would rather have it than not.

seavill · 11-06-2014 11:11pm

The DCG exam has been extremely difficult to predict anything that will come up, they are really looking for your understanding of each topic rather than being able to learn things off.

For higher level I would suggest borrowing an adjustable from someone if you can at all, time is so tight in this exam you need all the help you can get and it will speed up certain things if you are used to it

Noccy_Mondy · 12-06-2014 1:10am

You can only guarantee the assemblies question in section C. I find it to be one of the easier of the questions and marks can be easily picked up - from doing the project ye should have an understanding of exploded views and have an idea of how to re-assemble an item. Make sure ye have a stencil as well, for drawing smaller circles - which can be a pain to do with a compass, they are about €2. The adjustable set square is very handy as well, so have one of them if at all possible.

jellytots95 · 12-06-2014 11:59am

Noccy_Mondy wrote: »

Make sure ye have a stencil as well, for drawing smaller circles - which can be a pain to do with a compass, they are about €2.

Where would i get one of these? Are ye all mostly concentrating on practicing the exam questions or are there other things in the book you think are important? I'm dreading this exam so much

Osmosis Jones · 12-06-2014 3:29pm

Anyone know where I can get a roller ruler?

Noccy_Mondy · 12-06-2014 4:41pm

jellytots95 wrote: »

Where would i get one of these? Are ye all mostly concentrating on practicing the exam questions or are there other things in the book you think are important? I'm dreading this exam so much

Any stationary shop should have them. There are about 25 or thereabouts built in circles of different dimensions. Very handy thing to have.

BauBau19 · 12-06-2014 4:46pm

Any topics in particular that people are studying ?

jellytots95 · 12-06-2014 5:18pm

BauBau19 wrote: »

Any topics in particular that people are studying ?

Im hoping therell be a long question on intersecting solids

Also wouldnt mind a long solids in contact question, not that thats extremely likely :P

astra97 · 12-06-2014 7:14pm

Hey guys!
Do we have to lay out each page in the exam?
Should we put a margin around the edge of each page or can we just leave it blank? Cheers

jellytots95 · 12-06-2014 7:46pm

astra97 wrote: »

Hey guys!
Do we have to lay out each page in the exam?
Should we put a margin around the edge of each page or can we just leave it blank? Cheers

I'd say it's ok to leave it blank? We haven't ruled any pages the past two years :P

Noccy_Mondy · 12-06-2014 7:46pm

astra97 wrote: »

Hey guys!
Do we have to lay out each page in the exam?
Should we put a margin around the edge of each page or can we just leave it blank? Cheers

No not needed, no marks are awarded for marking out the sheet.

seavill · 12-06-2014 9:40pm

Also you will be wasting a huge amount of time. This is one exam that you have to be really conscious of your time both not wasting any and sticking to your time slots for each question and then move on

jellytots95 · 13-06-2014 12:43pm

Why is there so much to learn for ellipses and parabolas

jellytots95 · 13-06-2014 8:42pm

2010 question B-3 would be a dream question to get

accountname · 14-06-2014 1:30pm

Has anyone got the DEB mock? Could do with some more practice material

Huell · 14-06-2014 1:48pm

Anyone have any mock papers pm me i have nothing to do

Maniamax · 15-06-2014 11:02am

jellytots95 wrote: »

Why is there so much to learn for ellipses and parabolas

Maye it's cause I'm pretty maths-y, but I

Conics.

The only things of note to learn off are:

Ellipse Construction
Parabola Construction
Eccentricity Construction
Tangent Construction
Center of curvature

No?

jellytots95 · 15-06-2014 11:30am

Maniamax wrote: »

Maye it's cause I'm pretty maths-y, but I Conics.

The only things of note to learn off are:

Ellipse Construction
Parabola Construction
Eccentricity Construction
Tangent Construction
Center of curvature

No?

Ya but you've to know how to do all the different tangents do you?

Maniamax · 15-06-2014 12:48pm

jellytots95 wrote: »

Ya but you've to know how to do all the different tangents do you?

Well, it's the same for all of them. Join the Focii, bisect the angle, if tangent at a point on the curve.
Suppose your right bout the constructions for them being off the curve, those are a bit of a balls

BauBau19 · 15-06-2014 2:37pm

I have a pretty decent project. What would be the average mark given for the assessments ? Surely if we all get at least 35% it'll be pretty easy to pass.

caolan1996 · 16-06-2014 11:56pm

what is everyone going over tomorrow and the morning before ?

caolan1996 · 16-06-2014 11:57pm

what do ya think will come up for the roads q1 in section C ?

FlyingIrishMan · 17-06-2014 12:54pm

BauBau19 wrote: »

I have a pretty decent project. What would be the average mark given for the assessments ? Surely if we all get at least 35% it'll be pretty easy to pass.

We were told when it comes to DCG that you need to pass in both the drawing, and project. So 35% overall on the project, and 5% in the exam would still be a fail.

Exo · 17-06-2014 1:11pm

Project (160m - 40%), Section A (60m - 15%) & Section B (90m - 22.5%) .. given you can prepare for 77.5% of the paper, I think we'll be fine! The remainder 22.5% depends how lucky you are..

Dynamic mechanisms, anyone? Assemblies are awfully time consuming..

FatRat · 17-06-2014 1:54pm

I'm doing dynic mechanisms. I think the only hope of an A1 for me is if I get 100% in part C which is fairly doable, I find! But I've a feeling part C in the roads question will be tough. They've never asked for the apparent dip before which I haven't a clue how to do! Skew boreholes are a weak point. Although I love dynamic mechanisms! I find them simple...

Part A better be nice and there better be at least 1 easy question in part b! An intersecting planes question would be unreal. I'm 95% sure there'll be an interpenetration question also but I'm trying to avoid it. It usually takes me a full hour to finish one of those questions.

caolan1996 · 17-06-2014 2:07pm

FatRat wrote: »

I'm doing dynic mechanisms. I think the only hope of an A1 for me is if I get 100% in part C which is fairly doable, I find! But I've a feeling part C in the roads question will be tough. They've never asked for the apparent dip before which I haven't a clue how to do! Skew boreholes are a weak point. Although I love dynamic mechanisms! I find them simple...

Part A better be nice and there better be at least 1 easy question in part b! An intersecting planes question would be unreal. I'm 95% sure there'll be an interpenetration question also but I'm trying to avoid it. It usually takes me a full hour to finish one of those questions.

same my teacher said its likely for skew boreholes to come up on the roads question i hope hes wrong i have no clue how to do it does anyone know how to ?

XtotheZ · 17-06-2014 3:44pm

does anyone have any good resources for DCG? I mean basically everything. I done a class project but very little classwork so Im sorta screwed, especially after Physics yesterday

How do you determine the thickness of a stratum?

R00ster · 17-06-2014 8:03pm

dcgsolutions.org/Samples/DemoAG/DemoAG.html

FlyingIrishMan · 18-06-2014 1:14am

R00ster wrote: »

dcgsolutions.org/Samples/DemoAG/DemoAG.html

Guessed the URL for their other one, this ones probably even better.

http://dcgsolutions.org/Samples/DemoPD/DemoPD.html

CianDowd · 18-06-2014 7:33am

Huell wrote: »

Does everyone here have an adjustable set square? I had one and i broke it 2 weeks ago

Indeed I do

sirwhy wrote: »

We already have 40% of our grade, so the focus is on the paper. Anyone have predictions? What did you guys do for Section C?

I have no predictions but I'd like a good solids in contact with a nice intersecting planes or intersecting solids question.

I did road geometry and mining as well as cams and linkages.

caolan1996 · 18-06-2014 9:03am

what is every ones timing for this?

Daithi MacG · 18-06-2014 10:24am

How do I get the directrix of a conic section? I have it on some of my drawings but never wrote down instructions...

jellytots95 · 18-06-2014 10:53am

Daithi MacG wrote: »

How do I get the directrix of a conic section? I have it on some of my drawings but never wrote down instructions...

It depends what you're given I think

if you've the vertex and focal point then the distance between them is the same as the distance between the vertex and the directrix

Seriously lacking the motivation to actually do anything for this exam

XtotheZ · 18-06-2014 11:24am

FlyingIrishMan wrote: »

Guessed the URL for their other one, this ones probably even better.

http://dcgsolutions.org/Samples/DemoPD/DemoPD.html

thanks lads thats brilliant, shame i didnt know about it before now

Daithi MacG · 18-06-2014 11:25am

jellytots95 wrote: »

It depends what you're given I think if you've the vertex and focal point then the distance between them is the same as the distance between the vertex and the directrix

Thanks, I found it in a book

That's only for the parabola, for Ellipse if you're drawing from a cone, it's the points where the cone and focal sphere are in contact. If you're drawing from axes, then the distance from the focal point to a point on the curve divided by the distance from the same point to the directrix is the eccentricity

kierancos · 18-06-2014 11:40am

No one else doing ordinary level?

Huell · 18-06-2014 5:48pm

Grand paper overall was expecting a lot harder. Very dissapointed no interpenetration was on

FatRat · 18-06-2014 6:01pm

I thought that was an ordinary level paper. B-3 and B-2 were a bit... Way too easy, weren't they? Roads question was hard though!!... Well that's me done with the leaving! Goodbye

caolan1996 · 18-06-2014 6:27pm

i thought it was ok what questions from b did ya do i done b-1 and b-2 i also done the roads question but i dont no if i done part c of it right did you have to put the the vertex in the middle of the 100m and have it at 115m high ?

Tesco TripleChicken · 18-06-2014 7:19pm

caolan1996 wrote: »

i thought it was ok what questions from b did ya do i done b-1 and b-2 i also done the roads question but i dont no if i done part c of it right did you have to put the the vertex in the middle of the 100m and have it at 115m high ?

No it said "the ball reaches its max height of 115m after having travelled 100m. "100mm across from E, 115mm up from the red 65m line on the cross section, is the vertex of the parabola.

Solid_Shepard · 18-06-2014 7:27pm

Tesco TripleChicken wrote: »

No it said "the ball reaches its max height of 115m after having travelled 100m. "100mm across from E, 115mm up from the red 65m line on the cross section, is the vertex of the parabola.

Sorry but I am quite sure this is not correct. To be specific, the ball reaches an altitude of 115m. The line |DE| was at an altitude of 65m (as you say). Therefore, you go over 100mm as you say, because of the scale, but you only go up to 115m (so if you say every five millimetres is five metres, you measure up 50mm to the vertex, not 115mm as you've stated). That small issue aside, that is indeed where the vertex should have been.

EDOT: Saw the edit below, so I'm glad that it wasn't an issue (and besides, you wouldn't have had the space to go up 115mm so perhaps it was too nitpicky :P. Given that it's generally easier to see things, Caolan, this is, roughly, what you should have had (it should be noted I cannot remember the ground profile, so that's just a rough guess, the parabola shape is what is important): i.imgur.com/RN6LwTK.png

Tesco TripleChicken · 18-06-2014 7:33pm

Solid_Shepard wrote: »

Sorry but I am quite sure this is not correct. To be specific, the ball reaches an altitude of 115m. The line |DE| was at an altitude of 65m (as you say). Therefore, you go over 100mm as you say, because of the scale, but you only go up to 115m (so if you say every five millimetres is five metres, you measure up 50mm to the vertex, not 115mm as you've stated). That small issue aside, that is indeed where the vertex should have been.

Sorry that's what I meant...almost shat myself there thanks!
Count up to 115 in 5mm intervals from the 65m line (ie up 50mm from line) and across 100mm, that's the vertex

Tesco TripleChicken · 18-06-2014 7:51pm

Solid_Shepard wrote: »

Given that it's generally easier to see things, Caolan, this is, roughly, what you should have had (it should be noted I cannot remember the ground profile, so that's just a rough guess, the parabola shape is what is important): i.imgur.com/RN6LwTK.png

I can't remember exactly what it asked but didn't you have to bring the point where the ball lands, down onto the plan of the green? Can't see that in your diagram (I know it's not meant to be 100% accurate, but just seeing if you did it right or not.)

Solid_Shepard · 18-06-2014 7:55pm

Tesco TripleChicken wrote: »

I can't remember exactly what it asked but didn't you have to bring the point where the ball lands, down onto the plan of the green? Can't see that in your diagram (I know it's not meant to be 100% accurate, but just seeing if you did it right or not.)

I'm looking at the question now and it just states "In the profile view, draw the parabola and determine the position of the point on the green where the ball initially lands" so it doesn't seem neessary to bring it down onto the plan (I dropped the point down just to be safe, and I assume you did too, but it doesn't say you have to so I'd think it'd be fine with just the above). There is a mention of the plan in that it has "travelled a horizontal distance of 100m (in plan)" but the actual question doesn't seem to make note of it.

XtotheZ · 19-06-2014 9:21am

Pretty handy paper, easy short questions.

Now, lets go ****ing mental

caolan1996 · 19-06-2014 10:43am

Solid_Shepard wrote: »

I'm looking at the question now and it just states "In the profile view, draw the parabola and determine the position of the point on the green where the ball initially lands" so it doesn't seem neessary to bring it down onto the plan (I dropped the point down just to be safe, and I assume you did too, but it doesn't say you have to so I'd think it'd be fine with just the above). There is a mention of the plan in that it has "travelled a horizontal distance of 100m (in plan)" but the actual question doesn't seem to make note of it.

god dammit i hate misreading questions how much would i lose for it i done the parabola and labelled the point where it hit the green

Daithi MacG · 19-06-2014 11:11am

Did anyone do C-2? For the left hand side of the plan, I projected a view of the surface ACE from the left hand side of the elevation. I made it into a half-parabola with vertex E and the base on the line AC. Then I took the widths from that parabola for the plan of the curve AEC. I know I should've taken them from the other parabola that you had to draw, and I started to do that, but for some reason it didn't look right and I lost confidence in myself. Any know if that other method I used was also a possible solution? I'm pretty sure it's not though...

Huell · 19-06-2014 2:32pm

would you get bonus marks by ticking that you answered through irish? All you would have to learn is 5 or 6 words then get the marks :P just sayin'

** LEAVING CERT DESIGN AND COMMUNICATION GRAPHICS (DCG) 2014 **

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LEAVING CERT DESIGN AND COMMUNICATION GRAPHICS (DCG) 2014