Orthographic Drawings

It looks to me like it's got a rectangular hole in the front center, possibly running front to back, and a slot cut across the back side to side.

That's what I thought too but I asked the one who gave me this problem and he said it was wrong.

As drawn that is the only possible solution.

Front elevation shows a rectangular hole that goes through.

Side elevation shows a rebate (groove) centrally down one side that is NOT seen in the front elevation. Therefore it goes across the back.

Jim

#1 suggested the same but this is not the solution I dont think its hollow besides i asked the person who gave me this and he told ita wrong

A properly drawn view would show dotted lines for hidden edges. I can't tell if that's the case here. Otherwise, I agree with others that there's an error in the drawing. Maybe that's what your instructor is shooting at.

It is properly drawn. My mechanical drawing teacher pulled this one on us closer to 60 years ago than I want to remember. -- JHF

Google, plan view".

This sounds like homework.

One of the elevations is wrong it is not possible to have both one has to be a cutaway and then the edge behind should be visible.

A hidden edge line on the right side of the righthand drawing would clarify the side view, if the drawing were dimensioned.

Do you agree?

So would a cutaway, as you suggest. In any case it is meaningless, as drawn.

Agree with you and nickname. And what is with the weird-patterned fabric at the top of the picture?

Never mind - it's an AP.

The weird patterned fabric is something i'm working with for my project in uni

This is all what he gave. He as in the one who gave me the problem and he wouldn't give me a clue so I have to work with these elevations.

See # 12.

Before I leave this joke, I'm compelled to clarify.

The hidden edge line would identify the unseen (in this view) feature on the right. A solid line would define the still visible edge of the part in this view.

Do your own homework.

No. - JHF

Its not a cutaway i know that for sure, and as for the elevations it's not wrong either maybe there are some hidden lines which he did not give...

DO YOUR OWN HOMEWORK!

Chill xD this is not really my homework its just a wuiz thing which on of my friends gave and if you dont want tohelp me you're more than welcome to not participate in this discussion.

Thanks.

Then tell your friend to do their own homework.

Use a search engine.

Better yet tell your friend to use a search engine.

xD yourself.

I agree with #1 and #9. The projection in the bottom right corner shows the front face at the rear of the projection and the side elevation on the left.

I tried projecting the right sode bottom sketch, it's wrong though i figured the side elevation has to be on the right side of the front elevation or elswiit would tamper with the front elevation

Either way i still dont know the solution to this

http://www.slideshare.net/jcshearer/basic-blueprint-reading

Is this a picture frame or a fabric frame?

https://woodworkersedge.wordpress.com/tag/mortise-and-tenon-joinery/

The "side elevation" must be the right side of the "front elevation".

Obviously. the plan must be an approximate square.

The left elevation would then have to look like a mirror of the right.

The front shows a cutout.

Unless of course, it's late and I am having a Jack and water......

How does the front elevation work? The inner rectangle can't be projecting out and neither can it be hollow.

I can't make out the hidden detail (dotted lines) but could it be a rectangular hole from the front to the centre of the rear corner of the square?

Try this.......

How do I upload a picture?

That's not possible because thetrectangle within the revyangle is thr front elevation.

In ypur reply box there is a green colour camera button click that and upload the picture then click suit!

Hope it helped!

I tried this several times but the picture doesn't upload, what format should it be in?

Almost any internet picture format. Try JPG or PNG?

I have tried just about every format and nothing works. Most, like pdf, get rejected and jpg just doesn't upload. I believe the drawing is correct and I know what this is and it is frustrating that I can't communicate it. Is there someone I can email it to so they can post it?

Here is the drawing! I helped GIZMODAD upload it!

It is a very clever solution but look at #5 for the coordination of the views. You deserve a GA!

#5 shows standard third angle projection drawing views, which is the same format I used and, based on what was presented, is the same format used in the original post.

I intentionally omitted the hidden lines from the front and side views such that they would replicate the original presentation.

Thanks for that! I've never been able to get pictures to upload before, but it worked this time. Tried it with this one of my granddaughter as a test but as it's there you might as well have a look at her .

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This is not drawn correctly. You need hidden lines!

That's another possible solution - if the original presentation is first angle projection.

That's the best solution because it it shows how our minds automatically assume that it's a rectangular world, it also points out that when there are three degrees of freedom (x, y, z) you need three pieces of information to eliminate any ambiguities.

That's correct! Thats the solution

How do you know that's the solution, unless you knew all along?

It's a question they Ask in interviews and my friend who got that confirmed that this is the solution

In post #41 two of the corners are curved. In the original drawing the 3 visible corners of the projection sketch are rectangular. How can that be correct?

The original question said that he had been provided only the front and side views, so I presume the isometric sketch was part of his doodling to see what he could come up with for a possible solution. In the absence of a plan or other view then - while my answer is viable, we can do nothing but accept that the real, and very good, answer is that provided by yesyen.

I am sorry to disappoint you but:

if you look at the sketches you notice that because of the projection the "slot" is in the opposite of the rectangular surface.

Your solution is right if you consider the "european" projection: on the right the view from the left or the original sketch is the opposite : on th right the view from the right side!

You should in fact not be sorry since this error due to the projections is VERY common in international technical work.

I had to work with american engineers and if it was a problem this was the one which came at the top the most.

Or, completely round; like a hockey puck.

The OP has said that this is the "correct" answer. This answer ignores the isometric drawing which lead me astray. It even shows hidden lines Given that this "correct" answer doesn't show tangent lines other solutions can be given. Also, because there are no hidden lines the small rectangle on the Front Elevation can be something as simple as a name/logo sticker.
The bottom two satisfy the drawing as there are no tangent lines. The small rectangle can be anything that just leaves the hole with nothing to be seen beyond i.e. down the hole or it can be a felt pen drawn or engraved item.As there is no plan and hidden lines it could also be that the block has a hole going through that the rectangular hole opens up into. The same way that some furniture is put together with the bolt going into the rectangular hole and screwing into a round 'toggle' nut in the through hole.Thanks to YesYen for opening my mind.Jim

Here's some more. Yes, too much time on my hands. Good for a change

Ahhhh, so this is really another case of when an apparent hole is not really a hole, at all.

Nice!!!

When our teacher showed it to us the top view was round. -- JHF

Have we just been trolled by the OP?

Maybe, but it was a great brain teaser regardless… with viable solutions for each Projection method.

When I first came to this this thread, I stopped right after reading the OP and booted up my CAD. Since Projection (1st vs. 3rd) wasn't established - I assumed both and worked out plausible solutions for each.

I got the 3rd Angle version that Gizmodad provided in #34/35, but was admittedly stumped on the 1st angle version so, with a working lunch about to start, I assumed there wasn't one and concluded that the problem was based on only one projection. Just now, when I saw Yesyen's solution in #41 I was kind of mad that I did figure that one out.

Just goes to show how meetings with Sr. Management can make you [insert at will]. And, now off to more. If I'm not back by 6 Central, send the hounds.

Yeah, I guess it did have a lot of us thinking.

And proves once again that engineers never agree on anything.

We all like such brain teasers. Some stay in mind for ever. One such is the following:

Both the front-view (elevation) and the top-view (plan) are the same, 'a squire inside a squire'. What is the side-view? No dotted line, so no hidden details.

Is it off topic? If so, it is worthwhile to open up a new thread which could collect many more brain teasers

One among other shapes

Sorry, had I confused by saying, "No dotted line, so no hidden details". I meant, "Since there is no dotted line in the drawing, please infer that there are no other hidden details exist".

With this note, your iso's projections should be:

OK, "no hidden lines" as you mention means that NOTHING can leave the displayed body surfaces. It means that the small squares are ON the face plane since if the contour would have been obtained by an intersection with which ever other surface this surface should have been out of the face and thus generate a "hidden line". Following this logic, which can be of course wrong, the figures are DRAWN or PAINTED ON the faces.

The other faces can have any other figures drawn on since being in the face plane they do not generate any hidden lines.

It could be a cardboard box with labels or rectangular cutouts. Side view is square.
Jim

GA from me. I like that you also included curved surfaces that could be radii or eliptical, parabolic or wavy. Shows how important the third view is. Some solutions could also require a fourth view and/or a cross section.

Jim

Thanks. That is one of the possible variations I described that would conform to the given front and top views (ie: the large sloped surface needn't be flat, and the protrusion could be curved on its face).

Yes, that shape, solid cylinder, came in the mind first. The overall shapes of, both views would be same sized rectangles that could be a compelled assumption. As to have freedom, to have different sized rectangles, I had to think of attaching a cuboid to a semi-cylinder.

Take an A4 paper, and divide it into 4 parts with a pencil and ruler. Draw the front view of your object into the top left pane of the paper. From every pertinent feature of the front view (holes, spigots, grooves stc..) draw a very light pencil line across to the right-hand pane. This will give you the position of all the se pertinent features in the side elevation. Note that your side elevation(given) is incorrect. Yours is a sectional view How did you get that groove right through the object, from your front elevation.? It should be shown as a block with dotted lines for the 'hidden' feature (groove)along the breadth.

With orthographic drawing, the views must be developed from a single given view, and that is why it is called orthographic projection, as you are projecting characteristics from one view, across to the next. Return to the page you divided into 4, and draw a block 7cm high,4cm across, and with a 10mm hole drilled through horizontally This block is now shown front-side on, and is your front elevation.

Know what a center-line is? Draw a y-axis center in the upper right-hand pane for your side elevation, which remains a block 7 x 4 cm with a 10mm hole. Turn the block 90° to the right (visualize this) and draw what you see around your center-line.

What you now have is the same size block but the hole is facing away. Draw the hole in dotted lines across the breadth of the block (because you can't see the hole), and get it's upper and lower lines from the ones you so lightly drew across from the left-pane, showing the bottom and top of the hole. So ends lesson 1.

Now instead of squealing that you don't/ can't understand, simply figure out how to get your desired plan view into the bottom-right pane, using lines extended/ projected from the two views you already have.

Cheers!

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