By way of review - I want to go over some things to help alleviate some common errors that I am seeing in your work.
1) use of projectors to properly align the views presented - notice the image below:
In this figure notice how there is a correlation between the "visible" vertical lines and the vertical projection lines. For every visible vertical line there is a corresponding vertical projection line. The same is true for the "visible" horizontal lines and the horizontal projection line.
The PURPOSE of the projection lines is A) to establish the proper width of the next view. Notice how the width of the top view is the EXACT width of the front view. This is ensured by drawing the width of the top view completely WITHIN the two most extreme vertical projection lines. An additional purpose of the left and right most vertical projection lines is to proper align the top view with respect to the front view. The remaining interior vertical projection lines ensure the proper location on the top of the features indicated at their origin on the front view.
This same practice is duplicated regarding the horizontal lines. Notice the "upper most" and "lower most" horizontal projection lines. There purpose is A) to ensure that the height of the right side view does not exceed the height of the front view. The additional purpose B) is to align the height of the right side view WITHIN the horizontal projection lines originating with the front view. C) The remaining projection line properly locates the top of the milled feature that is evident in the front view.
The projection line at the 45 degree angle is required in order to properly locate BOTH the top and right side views with respect to each other AND with respect to the front view. You will notice that there is a 1 to 1 correlation between the projectors that intersect the angled projector and the horizontal "visible lines" in the top view. (note the upper and lower part of the hole). The extreme points of this hole are treated as though they were a "visible" horizontal line for the purpose of proper alignment/location of that feature.
Another common mistake is the orientation of the views when an orthographic projection drawing is created. Notice the image below: It is imperative that you familiarize yourself with the skill of visualizing the different views based upon the "front view".
The six views that are possible on any orthographic projection should ALWAYS be drawn in the arrangement and/or order shown below. You can be 100% certain that you WILL BE tested on this concept.
Be sure to remember the Glass Box Method - it will help you visualize in the absence of being able to use a physical object to create an orthographic projection drawing.
On the image shown below, use standard orthographic techniques to draw the three principle views of the image. You can copy and paste this image onto a word document to have a paper copy on which to work or simply use graph paper of your own. The answer (correct images) will be shown later in this same post. Try it on your own first.
This is a second practice image. Do for this image as you did for the first image above. Again the solution will be shown later in this post, but try it on your own first.
The following is exercise 1-8 in your text book. Complete this worksheet. Once again, this is a practice exercise and the answer will be given at the end of this post.
Note for Section 002 - A test has been scheduled for the next meeting time. The text will consist of questions on the power point slides we have been reviewing AND there will be a drawing component on the test as well. You will be required to draw in a similar manner to the way that we have been practicing in our past lessons.
Answers to Video exercise 1-6 The audio is not good on this one, but I have solved the problem and it is really good on latter lessons.
1) use of projectors to properly align the views presented - notice the image below:
In this figure notice how there is a correlation between the "visible" vertical lines and the vertical projection lines. For every visible vertical line there is a corresponding vertical projection line. The same is true for the "visible" horizontal lines and the horizontal projection line.
The PURPOSE of the projection lines is A) to establish the proper width of the next view. Notice how the width of the top view is the EXACT width of the front view. This is ensured by drawing the width of the top view completely WITHIN the two most extreme vertical projection lines. An additional purpose of the left and right most vertical projection lines is to proper align the top view with respect to the front view. The remaining interior vertical projection lines ensure the proper location on the top of the features indicated at their origin on the front view.
This same practice is duplicated regarding the horizontal lines. Notice the "upper most" and "lower most" horizontal projection lines. There purpose is A) to ensure that the height of the right side view does not exceed the height of the front view. The additional purpose B) is to align the height of the right side view WITHIN the horizontal projection lines originating with the front view. C) The remaining projection line properly locates the top of the milled feature that is evident in the front view.
The projection line at the 45 degree angle is required in order to properly locate BOTH the top and right side views with respect to each other AND with respect to the front view. You will notice that there is a 1 to 1 correlation between the projectors that intersect the angled projector and the horizontal "visible lines" in the top view. (note the upper and lower part of the hole). The extreme points of this hole are treated as though they were a "visible" horizontal line for the purpose of proper alignment/location of that feature.
Another common mistake is the orientation of the views when an orthographic projection drawing is created. Notice the image below: It is imperative that you familiarize yourself with the skill of visualizing the different views based upon the "front view".
The six views that are possible on any orthographic projection should ALWAYS be drawn in the arrangement and/or order shown below. You can be 100% certain that you WILL BE tested on this concept.
Be sure to remember the Glass Box Method - it will help you visualize in the absence of being able to use a physical object to create an orthographic projection drawing.
On the image shown below, use standard orthographic techniques to draw the three principle views of the image. You can copy and paste this image onto a word document to have a paper copy on which to work or simply use graph paper of your own. The answer (correct images) will be shown later in this same post. Try it on your own first.
This is a second practice image. Do for this image as you did for the first image above. Again the solution will be shown later in this post, but try it on your own first.
The following is exercise 1-8 in your text book. Complete this worksheet. Once again, this is a practice exercise and the answer will be given at the end of this post.
Note for Section 002 - A test has been scheduled for the next meeting time. The text will consist of questions on the power point slides we have been reviewing AND there will be a drawing component on the test as well. You will be required to draw in a similar manner to the way that we have been practicing in our past lessons.
Answers to Video exercise 1-6 The audio is not good on this one, but I have solved the problem and it is really good on latter lessons.
Answers to Video Exercise 1-7 Click below to see the answers to exercise #7.
Answers to Exercise 1-8 above:
Post any comments you have about the lesson. Give me some constructive feed-back. My goal is to make each lesson as engaging and as informative as possible. Let me know if I hit the mark on this one.
thank you for this! it's very helpful:-) God bless!
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