I need ur help w/ Top-Front-End

[AshDDS2B]

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What's your strategy in working with Top-Front-End questions ?

I know I supposed to identify the number of solid lines and hidden lines in one of the two views given and match that with one of the multiple choices. And I know solid line is the visible line and dash line is the hidden line. ... I also did a search and I some one suggested that

" if you are looking at a top projection the vertical lines from left to right, will be vertical lines from left ot right on the FRONT projection and the horizontal lines form left to right on the end projection. if you are looking at a front projection the horizontal lines from top to bottom will be top to bottom horizontal lines on the end view." I read the KP notes and the B&N-DAT, I'm still not getting it. Out of 15 I'm getting like 3-4 right. And that's the easy ones.

I really need your help with this.

 

[HBomb]

If you have time (and really you should), take a look at the PAT section in Barron's DAT. It outlines this approach and is called Event Counting. Kaplan does not cover this method. It's a very good approach. It is hard to explain, and that's why it sounds confusing when written. It helps seeing it visually, and Barron's does this. The short of it is that plane changes (horiz or vertical) in each view tell you one of the plane changes in one of the other views. For instance, the vertical lines, corners, and edges in the front view tell you the vertical lines, edges, corners in the top view. The horiz lines in the front view tell you the vertical lines, edges, corners in the end view. Like I said, it sounds confusing!!!

So, how do you event count this TFE that you provided. First the missing view is the TOP view. The front view tells you the vertical lines of the top view. How many vertical plane changes (events) in the front view? There are 7. The vertical plane changes (events) in the end view tell you the horizontal events in the top view. How many events? There are 4. So you're looking for 7 vertical events and 4 horiz events in the top view. Look at the answers: You can eliminate B and D because B has 5 horiz events and D has only 2. Answer choices A and C both have 7 vertical events, so you can't eliminate A or C on just the count of events alone. The relative distances in plane changes matter too! So look at the vertical lines of the top view, they should be in the correct proportions as those that occur in the front view. Between A and C, A has the correct plane change (event) proportions.

Also, if you're only getting 3-4 right out of 15, I'd recommend staying with the basics here first (because event counting is an "advanced" topic - I'm not trying to insult you here). Try to visualize the object and eliminate answer choices. Take your time. Go for understanding, rather than rushing through the problem. When you get better at this, then try event counting. Cuz if you're only getting 3-4 right, there seems to be a bigger problem here that may be helped by methodical practice first.

 

[AshDDS2B]

HBomb,

Thanks !!!

 

[justletmein]

Another thing that helps is using a 3d CAD program for all the funky ones that you just cant' get. You can draw it up real quick and rotate it and view it with the dotted lines and all , it sure helped me a lot on a couple crazy lookin ones. I used autocad inventor version 7 for this.

 

[podil]

And just keep doing problems. You'll see eventually the 3D images just start popping out at you.

-P

 

[boogaking]

Podil is right... practices makes perfect... but remember to just focus on two sides at a time... looking at all three sides can get you disorented... there are some tough problems on TS and a few on KAPLAN ....if you can figure out a game plan to tackle those... stick to it... and utilize it on the TFE problems on the real thing... im telling ya that the problems are equal or even easier than the practice... but word of advice... don't underestimate the other sections on the PAT... hint hint... angle ranking!!!!!!!

 

[HBomb]

Something I posted in another thread:

Practice visualizing the 3d drawing first. You absolutely must get the hang of visualizing first. Ultimately, visualizing is a skill you need to succeed on this section. Once you get the hang of it, this is the method I use:
1) use dimensions (if possible and only if obvious) to eliminate wrong answer choices (quick). That is: the two views will give you the overall dimensions of the third view, so eliminate the answers with the dimensions that don't work.
2) event count to eliminate wrong answer choices
3) of the remaining answers, take a single part of the object where answer choices differ, go to the remaining view and determine which is right. This is done by visualizing, and that's why you need to practice visualizing.

Remember there are only 4 answer choices (not 5) in this section, so process of elimination is ideal in this section.

Search for thread involving TFE and PAT and you should find a lot of stuff that may help.