# 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.

158 questions
Filter by
Sorted by
Tagged with
36 views

### How do I perform a lead of helix cut?

In this old blueprint from 1944, it calls for a lead of helix, 1 turn in .2" on red arrow: No other info is provided. This is a top view of the part. Here's ...
• 127
37 views

### Find dimension of surface arc in blueprint given instructions

I'm trying to find the dimension for the surface arc as shown here as L: It doesn't provide the dimension directly, instead it says: ...
• 127
23 views

### Circularity symbol with datum?

I am trying to interpret a technical drawing that has a datum attached to a circularity GD&T symbol. This page says that Circularity never has a datum reference. But this is a technical drawing ...
• 1
54 views

### Missing View From Orthographic Third Angle

so the drawing is missing the right side view, but i'm having a hard time to visualize how it look, especially the 90° part
44 views

### Orthographic projection technical drawing

My professor asked me to make the orthographic projection of this object with the third angle rule, but the object has an oblique/slanted surface. Does it require an auxiliary view too?
98 views

### Missing View and Isometric Projection

i'm having a hard time to project the missing top view and the isometric projection. My professor did not give me any information about what angle it is (like third angle or first angle), so I'm super ...
• 11
51 views

### What does this F symbol means in blueprints?

What does this F (similar to mathematical function symbol) means in blueprints? Year of blueprint 40s.
• 127
30 views

### What are the positions/diameter of the anti-rotation bumps on this mechanical drawing?

I am designing a front panel for an electronic device with PCB-mounted components on it. I need to provide precise CAD geometry for drill holes, etc. to the third party that will mill / manufacture ...
42 views

### Auxiliary View to Isometric Projection (3D)

I'm having a hard time to visualize this Auxiliary View into Isometric Projection or the 3D version, my friend said that it shape like a hinge, but I stil could not visualize it, can anyone help me?
• 11
30 views

### Create a mechanism to support a speaker in the upper part of an enclosure

I am working on an electronics enclosure. There will be two parts, the main enclosure and the lid that gets screwed. In the upper lid, I want to have a support for a circular mini speaker. The speaker ...
• 115
1 vote
82 views

### Orthographic Projection to Isometric Projection

How to construct this orthographic projection into an isometric projection? I really don't get the picture on how this orthographic projection turn into isometric projection. There's also some missing ...
• 11
55 views

### Find height of cone point in blueprint

In this blueprint I was not able to find where the height of the point of the cone angle should be. Here's the original blueprints: http://library.centerofthewest.org/digital/collection/WRAC/id/398/...
• 127
45 views

### Drafting - Specifying multiple hole quantities

First post in this stack but curious on if there is a 'right' answer (within Australian or ISO standard) for how to quantify numerous holes of same size/properties on a drawing. In the past I've seen (...
39 views

### Tolerances in the manufacture of mechanical parts (plastic)

It is necessary to make an adapter ring for connecting the smartphone to the microscope eyepiece (turn from ABS on a lathe, or 3D printing). Microscope eyepiece diameter is 33mm. What should be the ...
• 101
22 views

### Locating an angular surface using GD&T

I'm having doubts about how to dimension an angular surface using proper GD&T techniques. I want to achieve the 6 mm feature of size (FOS) at an angle of 89 deg. to Datum B to within an angularity ...
• 51
41 views

### Is there a default circular blueprint cut depth?

I have a drawing that has a circular cut: Nowhere it says how deep should the cut go into the material. Is there a default way to obtain the depth that I'm not aware of?
• 127
66 views

### How is the edge piece made?

Apparently the "CUP HOLDER" has a long history. The 1944 Spitfire cupholder above has me a tad confused about the manufacturing process. I am looking at the encased wired that is running ...
• 1,201
30 views

### What reference lines can be trusted and what points are being dimensioned

Based on the dimensions for the fold lines of the part above, the part is not square in the corners. It is my understanding that the short sides are actually at an angle other than 90 to the long ...
• 1,201
1 vote
50 views

### Model partial length top side fillet

Originally I was wondering how topside edges/outside fillets were actually machined so I could understand what I am seeing in a drawing and how to properly model it. I stumbled on this question before ...
• 1,201
21 views

### Mechanical Drawing Ventilation Abbreviations - Canada

I'm trying to figure out what the abbreviations are for exhaust fans in mechanical drawings. I've posted an example below, which is shown in the legend as Supply Air (SA), along with its size and ...
17 views

### BA Hole Designation

I a previous question I included a drawing for a strut. In this strut drawing it designates a 2 BA Hole in the bottom of the strut. I have seen this call out for many other parts that are part of ...
• 1,201
1 vote
53 views

### How would this piece be manufactured

I've started tinkering with drawing parts from the blueprints for a Spitfire Mk V. I am looking at this drawing for a support strut and I am wondering how one might actually manufacture it. In other ...
• 1,201
34 views

### surface roughness define how rough surface has to atleast be

Surface roughness standards generally say that the thing you specify is the maximum your willing to accept. But manufacturer could make a finer job if they wished. I however have a situation where the ...
• 3,597
59 views

### Can I omit the scale information in the technical drawing of a mildly complex mechanical part if I provide all of the necessary dimensions clearly?

and thanks in advance for taking the time to help me. TL;DR: I work for a company where I need to make technical drawings—mostly using SolidWorks—of some mechanical components. Do I have to include ...
56 views

### Is a geometric straight tolerance allowed on threaded bolts?

A custom bolt-like part needs to be particularly straight. Can a geometric straightness tolerance be added on the threaded part of the bolt or can it only be added before threading? The example can be ...
102 views

### What does this line with cross means in the blueprint?

In this blueprint, there's the line with a cross with diameter of .115 at the far right side. What does this line means? Does it means that the section with length ...
• 127
16 views

### Autocad Change Properties for All Object

Does anyone know how to change the Vertex X and Vertex Y value for all of the dots? Because some of the red dots has a different vertex X and Y value which also causes the shape to be slightly ...
25 views

### How to get angle of isometric drawing

My sincerest apology if this question does not fit the platform, I need urgent help, which is why am posting here for the first time. I am very new to Isometric drawing. I am given one sample and ...
• 101
28 views

### What is the relation between metric thread nut hexagon diameter and the major diameter

If we a M12 bolt what will the relation between the major diameter and the hexagon diameter be? If we calculate it geometrically it should be \$E(Hexagon\space diameter)=\sqrt{3}d(major \space diameter)...
1 vote
37 views

### What is the maximum width of this part?

I'm trying to create a PCB footprint for this part, but I'm not familiar enough with dimensioning to fully understand the diagram. Usually dimensions like D and E are specified as minimum and maximum ...
53 views

### How to best set GD&T datums for two oddly shaped parts?

I am very new to GD&T and currently working one of my first drawings for two parts (see simplified drawing below). For accurate alignment during assembly each of the parts has two locating ...
• 101
561 views

### How to interpret general tolerances (e.g., ISO 2768)

I am quite new to mechanical engineering, but currently working on a project which I eventually want to sent to a CNC service for machining. Many services I found can manufacture to, e.g., ISO 2768-m ...
• 101
68 views

### Find profile view when having frontal and top views

I need to find profile view of an drawing when I have frontal and top views.
140 views

### Rocket Nose Cone Design ,Ogives,technical drawings are not understood

I'm trying to draw a rocket nose cone. Notice the red marked at the bottom left of technical drawing. I couldn't figure out what the diameters 26.870 AND 59.732 mean. I drew endless lines vertically ...
• 105
1 vote
28 views

### Hydraulic circuit part question [Blanking Cartridge]

There is a part in this circuit called a "Blanking Cartridge". Its symbol looks identical to a standard capacitor in electrics. I have no idea what this part does. It is connected in ...
132 views

### Fin airfoil holder design and technical drawings not understood

I am trying to draw a fin for my final year project, but I could not fully understand the technical drawing explanations that I marked with red markings. especially R1.281 DEFINES TANGENCY OF R1.312 ...
• 105
339 views

### How to place a chamfer on the end of an angle cut pipe

Background The part above is from 1944 V2 plans which I am using as real world practice examples to teach myself 3D modeling using Inventor LT 2021. Therefore there is no original designer/engineer ...
• 1,201
1 vote
137 views

### What is causing the elliptical shape around the marked hole?

Background So I am looking at this piece titled "Ring" and I cant figure out what I am missing in the drawing that cause the elliptical shape at the two hole entrances on the right side of ...
• 1,201
38 views

In my on going series of teaching myself to model machine parts in Inventor, I keep stumbling across the following scenario for both external and internal threads. My reference drawing are from the ...
• 1,201
1 vote
68 views

### What is the unidentified shape in the drawing

Woot! HTTP://www.DigiPeer.de is back up and running so I am back to practicing part drawing in Inventor LT 2021. I am looking at the following drawing titled "Pin" (according to some ...
• 1,201
1 vote
22 views

### Replicate loft-based object to value-driven object

I've made the following oddity in Solidworks: All the dimensions are known except for the top part. This is probably because this was done using the Lofted Boss/Base feature. The Loft profile goes (...
• 387
66 views

### In which file format are technical drawings saved/stored? How can the data be exchanged between other software?

I just want to know how the information contained in technical drawings is stored? Is there a kind of major representation/file format such as the boundary representation? Is all the information ...
• 169
34 views

### Need help with Solidworks

Would I be allowed to ask which Solidworks feature I should use to make the recessed bit (circled in red) of the thing in the diagram below? Thanks.
• 103
1 vote
65 views

### Should I use the rounded values given on technical drawings or work at the highest reasonable resolution?

In the image, the table of dimensions only gives a resolution of 1mm; in the actual creation of such a sign, would these approximate values be used or their true values (within reason)? For example, R ...
1 vote
67 views

### what does four 8-32 holes on a 50mm bolt circle mean in this diagram? This drawing is for an ampflow E30-400-24 dc motor

the link to the website is here:https://www.ampflow.com/motors/highPerformance/threeInch/ that drawing I think is the front of the motor, the shaft is in the center, the 4 holes around it are ...
27 views

### How are 2D views from a 3D CAD Model stored in STEP-File with Boundary Representation generate for engineers to define details? And why?

I am new in this topic and need some help. There are 3D CAD models (stored as STEP Files with the boundary representation) and some engineers need 2D views of these models for further processing. With ...
• 169
171 views

### Airfoil engineering drawing

In an engineering drawing how would you dimension the cross-section of an aircraft's airfoil? Obviously, you would have to include the chord length, leading and trailing edge radius, and wingspan. But ...
549 views

### Are these section views correct Autodesk inventor

So I used AutoDesk inventor and created this machine part for the purpose of exercise , But it is preferred to not to hatch ribs in my course so is there a way to make it look like image (5 and 6) ? ...
1 vote