# Questions tagged [technical-drawing]

Technical drawing, drafting or drawing, is the act and discipline of composing drawings that visually communicate how something functions or is constructed.

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### Should a stiffener be hatched

In my course it's preferred not to hatch ribs and webs so should I consider a stiffener like them and not hatch it or is it different and why ?
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### How to visualize isometric parallel projection?

I read the definition of Isometric Projection from this pdf that Projection plane intersects each coordinate axis in which the object is defined (principal axes) at the same distant from the origin. ...
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### What are these hidden lines tangent to the circle?

I don't understand what the hidden lines are nor the fillets tangent to the center line of the circles if someone can help with the 3d isometric that would help a lot.
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### Trying to draw rib tangent to a circle AutoCad 3d modeling

I'm trying to draw a rib tangent to a circle but If some one can link a video or a tutorial on how to do that I'd be really thankful here's the drawing in 2d (the rib is highlighted with the red ...
1 vote
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### What software is used to create the graphics for stuctural analysis textbooks?

I want to create some 2D and 3D drawings of simple trusses and frames. and I was wondering, what is the software used to create the graphics seen in structural analysis textbooks (example: R.C ...
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### How to visualize angle of projection in Oblique Parallel Projection?

We know that in Oblique Parallel Projection Point $(x,y,z)$ is projected to position $(x_p,y_p)$ on the view plane.Projector (oblique) from $(x,y,z)$ to $(x_p,y_p)$ makes an angle $\alpha$ with the ...
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### Best Practice for Tracking Vendor Firmware Rev

My employer has had me create a model of a vendor product (using OnShape) and make a simple drawing with some overall dimensions that we can hand to customers. However, they want to include the ...
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### Is there sufficient information to complete the bottom end?

BACKGROUND Fresh of the heels of figuring out my "kinky" issues in this question I thought I was fully prepared to deal with the following drawing titled COILED PIPE 2. The drawing seemed ...
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### Coiling and bending pipe in 3D model

BACKGROUND: I had previously dealt with 2 pipe coils with oddly bend ends. for the most part I was able to use the coil tool and was able to line up a bunch of 2D sketches to complete the odd end ...
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### Part drawing information vs Assembly drawing

With my progress through various drawings, I finally came across an assembly drawing with parts I have actually drawn up that caught my eye. The first part drawing as shown below is a simple sheet ...
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### What is the best way to handle the hole pattern in this drawing

Apparently I am on a roll of more questions than not today. In the following drawing, there is a pattern (partial?) of 2.7 mm holes. The word in German pointed at them according to google translates ...
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### Are these cut lines?

In the following drawing I am looking at the lined that come in on either side of the teeth/tabs that are spaced 9 mm apart and extend 6 mm into the material. In my head these are cut or shear lines ...
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### Loft not quite making the cut

I am working in Inventor LT 2021 which means I do not have access to the sheet metal tool. Which would have been great as the example I am working on is sheet metal. The example drawing I am working ...
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1 vote
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### What does the Pg annotation mean

While I am continuing my practice with the German drawings of the V2 rocket, I have come across the PG designation a couple of times on different drawings. I originally thought it was for diameter, ...
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### Concentric Circles & Section/Breakout Confusion

This is part of my on going saga of drafting question with respect to the V2 drawings I am using for practice while learning inventor. The following drawing is titled "Partition" (...
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### V2 drawing interpretation

This is part of my on going saga of drafting question with respect to the V2 drawings I am using for practice. The following drawing is titled "Container Overview". It has left me with 3 ...
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1 vote
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### Interpreting drawing annotations

The other day I was looking for example drawings to follow that would be used in a real world context as opposed to basic exercise books and I stumbled across a museum archive of the V2 rocket design. ...
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### How would you level this arm on a base?

I was wondering how can I level smartly the following equipment's slighlty heavy arm. The arm is fixed on a base with 4 big socket head screws. The same arm needs to be levelled via the 4 jacketscrews ...
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### Inventor Filleting Issue

I am a beginner practicing with Inventor 2021 LT and I was working on the following sample drawing when I ran into an issue with fillets: At the top edge of the U-shape slot, a rounded corner can be ...
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1 vote
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### Interpretation of dimensions

Continuing through my practice examples I came across the following diagram and I have a question on how to interpret the depth of the part. I have the part drawn up in inventor, but when I went to ...
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1 vote
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### Symbol and dimension question for practice sketch [closed]

I am practicing with Inventor LT 2021 to get used to it, and learn more about how to manipulate things in it. I was practicing with the following sketch and I developed a bunch of questions about the ...
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1 vote
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### Why are there sometimes slash marks and sometimes arrows in dimension lines?

Sometimes, I see dimension lines drawn like this: Where there are extension lines and double-headed arrows between them. This is also how my textbook, Technical Drawing with Engineering Graphics, ...
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### How to interpret tolerance in technical drawing

I'm trying to interpret the following mechanical drawing: However, I struggle with the "tolerances" part. Shouldn't one dimension (like $44$ diameter) have one number attached to it, to ...
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### How to place a sketch plane at a specific geometric location

My background drafting is structural bridge drawings. I had Inventor LT installed the other day and I have been playing with it to refamiliarize myself with it and get used to the differences between ...
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### What are the exact dimensions of this screw?

When working on a technical drawing project, I couldn't find the exact dimensions of the following screw In particular, I don't understand the $0.5:1$ to $\emptyset 15$ indication. Is this screw in ...
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### I need help with dimensions on technical drawing

Here is a 3D model of a housing: How can I specify the position of the marked features ?
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### Projecting side surface from a 3D object made by lofting in autocad into 2D

i have made a 3d object by lofting two circles in autocad: Now I want to project the newly made side surface (without the two original circles) into 2D so I can make it with sheet metal. By ...
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### Getting a 3d object from connecting two parallel surfaces and then viewing the new side surface

I have two slightly different surfaces (circle with a part chopped off and a similar circle but with half of an ellipse in the chopped off part) and I want to connect them into a 3d object and then ...
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### How to Construct a Primary Auxiliary View given that an oblique surface with 6 sides

I need to construct the auxiliary views with the given front and right side orthographic views. The view is in third angle projection. I observed that there is an oblique surface so that perhaps I ...
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### Finding the isometric view of an object from the front and right side view

I need to draw the isometric view and top section view of the object given only the front and right side view. I understand on how other edges of these views correlate with each other. I just do not ...
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### Does anyone know the name of this mechanical part?

Does anyone know the name of this mechanical part?
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### Meaning of quarter hole color fill in drawing

In this drawing 4 of the holes have the top left quarter filled in black. What is the meaning of that? It it some special type of hole? The drawing is from a Waveguide and in the specs it says ...
1 vote
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### How to align the assembly in Siemens NX?

I rotated the assembly somehow and when I try to make a technical drawing of the assembly this happens: As you can see, the cylinder ( assembly ) makes an angle. How can I fix it ?
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### Sleeve and cotter joint

What does 0.1D signify in this cotter joint. I meant is it denotes spacing between pin and hole. I am new to machine drawing , kindly let me know. Thanks in advance
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### How to find a reference line for " Form Tolerances"?

In my project I have to choose a form tolerances ( parallelism ) between the handle ( purple part ) and the part that sits inside it ( the grey part ), where the two parts slide on each other. But I ...
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### How to find old (especially Soviet/Russian) blueprints

I am interested in old blueprints, especially if related to aerospace (and from the old Soviet Bloc), things like these: Vostok blueprints Soyuz blueprint. Does anybody know if there is any methods to ...
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### Conversion of orthographic projection to isometric projection [duplicate]

I'm new to engineering drawing, and I am having trouble drawing isometric projection from orthographic projections. Can someone give the steps/thought process behind this conversion? I can upload the ...
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### Shape of the shaft of knurling device

I'm trying to design and simulate a simple knurling device. The shaft ( blue part ) has a flat surface at the other end, where the small grey pin connect the green body to the shaft. I guess you can ...
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### What if the paper of my drawing changes at the last moment?

I have a full set of about 500 drawings sheets, in Autodesk AutoCAD 2018, with layouts, paper sizes and scales set up for an A0 paper, meant to be printed in A0 at the project beginning. At the very ...
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### How to choose tolerance size?

I can not really understand how people decide what tolerances to set for a part or assembly. For example: When can I choose 0.2 mm and when 0.002 mm; and if I choose 0.002, why didn't I choose 0.001 ...
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### Can you help me to interpret technical drawings?

I'm trying to find out the angle/ length of the oblique line, or the solid angle of the conic part. This is what I've tried so far: According to the pythagorus theorem the length of the line is equal ...
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### Ambiguous technical drawing sizes

I'm having trouble reading several dimensions on this technical drawing. First, I don't know how big is the diameter of the marked cylinder. M24 is a threaded hole in my opinion and that cannot say ...
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### How to indicate bolt direction on a drawing?

Consider the following steelwork drawing: The location of the 6 no. M12 bolts are indicated with a circle and cross. However, it is not clear whether the shank of the bolts should point into or out ...
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### Is there anything in BS 8888 regarding the scale of a section view?

If a section view isn't sufficient enough to show all details required, can it be at a larger scale than its parent view? Is there anything in BS 8888 regarding recommended scales in section views? ...
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### Notation of a technical drawing

can someone explain me what 1/8" or 1/16" means in the image below?
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### Specifying GD&T feature when not expecting the fabricator to measure it

For context: I work designing one-off science exhibits. Generally we design around pretty sloppy tolerances when we can, so things can be cheaper to make, with less precise tools, and at more ...
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### How to draw an arc through 2 known points and tangent to a line

I am using AutoCAD and I was trying to figure out how to draw a circular arc through 2 known point and tangent to a line. When I look at the circle tools I see the following options: When I look at ...
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Please help me to identify what C5 stands for in this picture. Full drawing is available here.
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