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**D.C.G...Before/After**

135

Comments

  • #62
    Togepi
    Closed Accounts Posts: 4,813 ✭✭✭Togepi


    JailB8 xoxo wrote: »
    my prediction is we'll all do disgustingly ****/average but still get alright marks because of the project

    That's exactly what happened me last year. Nearly failed the exam - C2 overall. :D


  • #63
    JailB8 xoxo
    Registered Users Posts: 25 ✭JailB8 xoxo


    Togepi wrote: »
    That's exactly what happened me last year. Nearly failed the exam - C2 overall. :D

    would you say they mark the projects fairly easily ? mine was decent but not perfect but if i get 30 out of the 40 going in im happy


  • #64
    Mayo_Boy
    Registered Users Posts: 661 ✭✭✭Mayo_Boy


    I can't really understand how to do perspective properly :/. Any tutorials or anything online to show how to do it?


  • #65
    Togepi
    Closed Accounts Posts: 4,813 ✭✭✭Togepi


    JailB8 xoxo wrote: »
    would you say they mark the projects fairly easily ? mine was decent but not perfect but if i get 30 out of the 40 going in im happy

    I'm not sure, my teacher thought I'd get about 37% out of the 40% - ended up with 34% so I s'pose they mark them fair enough. They wouldn't mark them really easily though, but they're fair. :)


  • #66
    IRA 1916
    Registered Users Posts: 95 ✭✭IRA 1916


    Intersecting planes better shagging come up


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  • #67
    mathstalk
    Registered Users Posts: 162 ✭✭mathstalk


    IRA 1916 wrote: »
    Intersecting planes better shagging come up

    I hate planes. I'm usually good at thinking of stuff in 3d but when it comes to planes my brain just goes blank.
    Hoping for solids in contact/ intersecting objects myself.


  • #68
    mathstalk
    Registered Users Posts: 162 ✭✭mathstalk


    Mayo_Boy wrote: »
    I can't really understand how to do perspective properly :/. Any tutorials or anything online to show how to do it?

    If you have the DCG Leaving Cert book by Joseph Terry, I think it's explained quite well in there.


  • #69
    MattHelders
    Registered Users Posts: 303 ✭✭MattHelders


    IRA 1916 wrote: »
    Intersecting planes better shagging come up

    Agreed. Comfortably the easiest question on the paper


  • #70
    GarIT
    Registered Users, Registered Users 2 Posts: 8,671 ✭✭✭GarIT


    What are all the possible topics that can come up, excluding section c because I have that covered, I just need to know that I have everything else done.


  • #71
    Wanchor
    Registered Users Posts: 114 ✭✭Wanchor


    mathstalk wrote: »
    I hate planes. I'm usually good at thinking of stuff in 3d but when it comes to planes my brain just goes blank.
    Hoping for solids in contact/ intersecting objects myself.

    I find skew lines a lot harder to visualize than planes! Solids in contact can only come up in Section B, right?


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  • #72
    Togepi
    Closed Accounts Posts: 4,813 ✭✭✭Togepi


    Wanchor wrote: »
    If find skew lines a lot harder to visualize than planes! Solids in contact can only come up in Section B, right?

    They can come up in Section A too.


  • #73
    Mr. Tambourine Man
    Registered Users Posts: 11 ✭Mr. Tambourine Man


    Wanchor wrote: »
    I find skew lines a lot harder to visualize than planes! Solids in contact can only come up in Section B, right?

    Pretty much anything can come up anywhere in sections A or B


  • #74
    Mista
    Registered Users Posts: 183 ✭✭Mista


    Ok, so in CAMs when your increasing/decreasing a curve, there uniform velocity (straight line), simple harmonic (the semicircle) and the parabola? Is this all, and whats the parabola called? :pac:


  • #75
    Wanchor
    Registered Users Posts: 114 ✭✭Wanchor


    Mista wrote: »
    Ok, so in CAMs when your increasing/decreasing a curve, there uniform velocity (straight line), simple harmonic (the semicircle) and the parabola? Is this all, and whats the parabola called? :pac:

    UAR (Uniform Acceleration and Retardation) is the parabola construction.


  • #76
    celtic10000
    Registered Users Posts: 92 ✭✭celtic10000


    Cant do developments to save my life. Between surface geometry and section B its bound to come up too :( Really hoping for Planes,Axonometric, Interpenetration or a handy solids in Contact question.
    Do ye think skew lines will come up for a third year in a row? And do ye think maybe a car park might show up for GEOLOGIC GEOMETRY? And has anyone got any tips (at all) on SURFACE GEOMETRY? :P


  • #77
    Mayo_Boy
    Registered Users Posts: 661 ✭✭✭Mayo_Boy


    Im fecked for tomorrow and I don't even seem to care for some reason :rolleyes:
    It's my last exam :cool:


  • #78
    siobhanod93
    Registered Users Posts: 179 ✭✭siobhanod93


    Just a quick question off topic!
    I don't do DCG. What is the subject? I'm just curious. Is it like Tec Graph for Junior Cert? :)


  • #79
    ImFudged
    Registered Users Posts: 37 ✭ImFudged


    siobhanod93 wrote: »
    Just a quick question off topic!
    I don't do DCG. What is the subject? I'm just curious. Is it like Tec Graph for Junior Cert? :)
    This exactly what it is. Except a bit harder


  • #80
    Togepi
    Closed Accounts Posts: 4,813 ✭✭✭Togepi


    ImFudged wrote: »
    This exactly what it is. Except a bit harder

    Yup that's it except I'd say it's a lot harder, and there's a massive project too which is fairly arty and computery. :)


  • #81
    J_E
    Closed Accounts Posts: 5,734 ✭✭✭J_E


    I wouldn't say DCG is as hard as people are making it out to be considering the old course was more in-depth. If you're decent with computers and you have a knowledgeable teacher, you won't have much issue with Solidworks. You don't need a background in Tech Graphics to pick up on the content, I only did TG for 1st year and with a little extra work when I started DCG I caught up. You get choice with the questions as well.


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  • #82
    mcpaddington
    Closed Accounts Posts: 358 ✭✭mcpaddington


    If you run out of space on one of the pages do you get another small piece of paper to draw the remainder of what you're doing?


  • #83
    Mista
    Registered Users Posts: 183 ✭✭Mista


    mcpaddington wrote: »
    If you run out of space on one of the pages do you get another small piece of paper to draw the remainder of what you're doing?

    Yea, that's what I'd do.. just seloptape it on at the place where you ran out :pac:


  • #84
    GarIT
    Registered Users, Registered Users 2 Posts: 8,671 ✭✭✭GarIT


    How do you draw a parabola where you only have the focus and the two points on the base, ive never seen that before today.


  • #85
    Mista
    Registered Users Posts: 183 ✭✭Mista


    GarIT wrote: »
    How do you draw a parabola where you only have the focus and the two points on the base, ive never seen that before today.

    What do you mean? Just draw a square around it and plot points?


  • #86
    kaet
    Registered Users Posts: 9 ✭kaet


    Does anyone who does Dynamic Mechanisms know the difference between Logarithmic and Archimedian spirals?


  • #87
    GarIT
    Registered Users, Registered Users 2 Posts: 8,671 ✭✭✭GarIT


    Mista wrote: »
    What do you mean? Just draw a square around it and plot points?

    Thats if you have the vertex, the focus is a point in the parabola like the focus on an elipse.

    If anyone could explain 2011 A-2 or 2010 A-3 it would be great.


  • #88
    Cathalog
    Registered Users Posts: 329 ✭✭Cathalog


    Now the cramming is setting in.. And I have a frigging exam on Friday too. When will it all just eeeennnndddd!!! :(


  • #89
    mcpaddington
    Closed Accounts Posts: 358 ✭✭mcpaddington


    GarIT wrote: »
    Thats if you have the vertex, the focus is a point in the parabola like the focus on an elipse.

    If anyone could explain 2011 A-2 or 2010 A-3 it would be great.

    2011 A-2

    From the focus draw a line at 45 degrees to the left which will hit the line E. Bring that place it hits it down to the line, that gives you the second vertex.

    You already have the first vertex given in the question so measure the distance between F and the second vertex you got, then go the same distance from the vertex given, this fives the second focus.

    Hope it helped.


  • #90
    Mista
    Registered Users Posts: 183 ✭✭Mista


    I haven't a clue about focal points/directrix/etc... ah well :Z


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  • #91
    GarIT
    Registered Users, Registered Users 2 Posts: 8,671 ✭✭✭GarIT


    mcpaddington wrote: »
    2011 A-2

    From the focus draw a line at 45 degrees to the left which will hit the line E. Bring that place it hits it down to the line, that gives you the second vertex.

    You already have the first vertex given in the question so measure the distance between F and the second vertex you got, then go the same distance from the vertex given, this fives the second focus.

    Hope it helped.

    Thanks, just one question is the focal length the long axis swung from the top of the short axis?

    Any chance you could explain the parabola from 2010 too?


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