9

The "2-" refers to the fact there are two of these holes somewhere on the print. Rather than making that same note every time the hole appears, you can say "2-" or "6-" and leave it to be assumed that all similar holes are identical to the dimensioned one. (At my company, we use "2x" or "6x", but this person may not have wanted to do this considering there's ...


9

To remove such ink it needs to scraped off, usually with a scalpel blade. This works well on thicker and more studier media such as film or vellum, but it will always be obvious where the erasure was made. Depending on the amount of ink that needs to be removed and the robustness of the media, sometimes an ink erasure can work (such as a Staedtler blue ink ...


7

I am a practicing structural engineer with plenty of wood experience. That said, this is a bit of a tricky note because I believe it was probably written by an architect on a set of architectural drawings (as opposed to by a structural engineer on a set of structural drawings). Therefore, I think the note includes information about both the structural makeup ...


7

I am not a professional engineer yet, but in my engineering design courses we were taught to show certain dimensions. For example, you choose a datum line and show certain dimensions. You don't need to label every single dimension, but you should show your dimensions in a way such that the dimensions which are NOT shown can be calculated arithmetically. For ...


7

My general philosophy is that you don't need to dimension everything, you just need to dimension every unique feature. For instance, say you have a bolt pattern, with one hole in each corner. You give the dimension for every offset for the holes, but this is more information than required. The way I do it is to show bounding dimensions for the plate, ...


7

Let's break it down: 5x - There are 5 of these holes, with the same dimension. You should be able to spot these fairly easily, as any similar holes with no dimensions on them. M4x0.7 - These holes have a Metric Thread, with 4mm outer diameter, and 0.7mm pitch. This is the "M4 Coarse" standard. ↧ 6.3 - The holes are 6.3mm deep. This is the 'full diameter' ...


5

This describes the difference. http://www.vista-industrial.com/blog/engineering-drawings-vs-manufacturing-drawings/ To summarize: A design drawing or engineering drawing is a complete specification of the finished product - in other words, it shows the important properties of each part (dimensions, materials, specifications for electrical components, etc), ...


5

Is it possible to remove the ink? A quick Google search isn't turning up anything, as I more or less expected. Ink isn't meant to be erased, so I'm going to hazard that there is no product that will erase the ink for this pen. Normally, the only "erasable" ink pens I see are the cheap, consumer-grade pens that use a more standard-grade ink (erasable is a ...


5

As with many questions, the real answer is "it depends." The biggest variables are what kind of engineer you are, who your audience is, and what industry you're working in. In a class setting, it is probably a good idea to consult your textbook or your teacher for their opinions in the context of the class, but here are some general factors in ...


5

Arc 22 does not connect with arc 26 there is a straight horizontal line in between. The hint to this fact is in the width dimension of 44 that would not exist otherwise. There are further hints in the image itself, the small construction line segment shows that its a round of a corner. With a trained eye you can also see in the image the the curvature ends ...


4

Gear design from scratch is a fairly major process in itself and so the vast majority of gears are made to standardised tooth profiles. Metric gears are usually designed to the module system. This specifics gears according to pitch circle diameter and number of teeth (the module number is the ratio between the two). So a larger module means finer teeth. ...


4

There are many ways to do this, but they all depend on the same basic fact that the sines and cosines of the angles $36°$ and $72°$ involve $\sqrt 5$. For example $\cos 36° = (1 + \sqrt 5)/4$. Since $\sqrt 5 = \sqrt{1^2 + 2^2}$, These angles can be constructed by starting from a right-angled triangle with sides $1$, $2$, and hypotenuse $\sqrt 5$. In the OP'...


4

Yes, with the caveat as supplied by masiewpao's answer that dims which can be calculated directly from supplied dims can be left off. The reason you must write in the dims is that "to scale" is purely qualitative. Nobody ever puts a scale on drawing to guesstimate the dimensions. The reasons why not should be obvious :-)


4

The 1-1/4 drill is a reference to the diameter of the drill. The hole will have a radius of 5/8.


4

The diagram most closely related to the original question seems to be a kinematic diagram. Kinematic diagrams are standardized in ISO 3952, although it seems that most often people are just copying what they have seen without reading the standard (which is quite old, but then this is common anyway). The standard is in 4 parts and covers symbols, and ...


3

It very much depends on the context. Drawings are there for a purpose ie to communicate information and you need to keep that specific purpose in mind when producing the drawing. For example if you are producing a drawing for the manufacture of a part then you need to think about what information is needed for the manufacturing process. I know from ...


3

Involute spur gears have involute shape. This means that the point of contact between meshing teeth will move in a straight line (called the line of action). Visualized it will look like a string is unwound from one wheel and wound on another wheel. image captured from woodgears.ca free gear template page It is the number of teeth and the angle of that ...


3

The file format for *.dwf files is defined. A reference for the various drawing commands can be found here. Specifically, the definition of the Draw Circle/Circular Arc/Circular Wedge function is here. From that link an arc is described by: X,Y,R Start,End where: X,Y - Center point (in logical coordinates) of the circle to be drawn R - Radius (in logical ...


3

I suggest you to watch these videos first: AutoCAD 2D to 3D Conversion Trick Learn how to take 2D drawing designs and ideas and turn them into 3D objects. http://acronymonline.org/2d-flat-geometry-3d-autocad/ Also: How to Convert a 2D Model to 3D Using AutoCAD by Darrin Koltow, studioD, http://smallbusiness.chron.com/convert-2d-model-3d-using-autocad-...


3

Imagine you wanted to show a drawing of a car. You can show the exterior features just fine, but how do you show the interior features? If, for instance, you wanted to show where the steering wheel was with respect to the driver's seat, how could you do that? There are a number of different ways to do it, but the most straightforward is with a section view. ...


3

The process of creating an engineering drawing is called either technical drawing or drafting. How to draw is covered under the standard ISO 128. The separate drawings from different directions are called views, how to use views is covered in exacting detail in standard ISO 128-30 and 128-34. number of views and choice of views is governed by desire to use ...


3

This appears to be a Cavalier projection since the oblique lines are at the same scale as the xy plane. The name comes from military fortifications - a "cavalier" was the French term for an artificial mound behind a defensive wall, which allows the enemy to be seen over the wall. As the name might suggest, a low "cavalier" provided a relatively risk-free way ...


3

I don't want to spoil the fun of solving this for yourself so I offer the following suggestions: Redraw the assembly with all edges, including the hidden edges, shown as dotted lines. Draw solid lines on all the intersections. Join up any vertices which form edges not on the outer surfaces of the assembly. Count the faces. Step 3 is the only tricky bit. In ...


3

I would research component manufactures web sites. It is highly unlikely that you will find all the information in on location. Here our example web site links to get started. NZXT - Mini ITX Computer cases Fractal Era ITX Computer cases Mini-ITX Mainboard Specification Hydro Series™ H100i RGB PLATINUM 240mm Liquid CPU Cooler Another good place to look for ...


3

One could argue that sphericity is a specific type of profile tolerance. You would just need to make sure perfectly opposing points on the surface (or as close to it as possible) are inspected to properly calculate the diameter.


3

My interpretation is the following (the dimensions are not exactly accurate).


2

Take some object, and place it so that your line of sight is perpendicular (technically, normal) to the front of the object. You see the front of the object only - essentially, a two-dimensional view. If you were to superimpose a grid on the object, it would look like a Cartesian plane: These are the four quadrants, which you might have heard of in geometry....


2

I think your history isn't quite right here. The first widely-used CAD systems used Bezier curves, where the end points of each section do lie on the curve. For cubic Bezier curves, the intermediate points also lie on the tangent lines at the end of each segment. This corresponds quite closely to the constraints that are implied by using a physical drafting ...


2

You can buy a replacement nib. The following picture is from eBay. I just wanted a picture to show you that it is possible to remove the existing nib and replace it. I would suggest you make enquires with pen supplier, or search the internet for a replacement nib.


2

Yes, it can be removed but it is a delicate task requiring some experience...I first did this over 50 years ago. You should be drawing on some heavy velum that can withstand the erasing. You will need an erasing shield and electric eraser with the coarse dark grey eraser to gently sand a layer of paper off with the ink. It's easy to erase a hole. If you'...


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