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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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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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
...
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What does "do not scale drawing" in a drawing sheet mean?
I opened a new sheet in Solidworks drawing, in the title block, there was a field written "Do not scale drawing". What does that mean?
There is a scale already being chosen over there. It was just a ...
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What does an E in a circle after a diameter mean?
I’m pretty sure it’s something to do with the fitting, possibly specifying to use the minimum circumscribed or maximum inscribed circle to tolerance the diameter but I can’t remember.
The tolerance ...
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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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Rule of Tens/Ten to 1 Rule in Measurement and Inspection
I'm trying to clarify my understanding about the requirements [read: best practices] for measurement resolution and measurement confidence.
The "Rule of 10s" is a commonly tossed around guideline ...
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Is the diameter before knurling assumed to be the same as diameter after knurling?
If the diameter before knurling is 80. Is the knurled diameter also 80?
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GD&T for Multiple Surfaces as Single Feature
I'm looking to get some collective agreement on a question that I have come across a few times now. When referring to features that are technically independent, what is the general consensus on ...
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How to display an adiabatic boundary condition in a diagram?
I want to create a diagram. It will consist of a plate with a uniform heat load, a heat sink, and an adiabatic boundary condition. I thought of displaying the sink as a rigid attachment (as in ...
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How to model Motor Windings in Solidworks?
I want to model a DC motor in order to eventually do some simulations (temperature/cooling related) and I'm wondering what is the best way to model the motor windings?
I've seen a few video's on how ...
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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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What is an acceptable tolerance for a non-engineering dimension
I have part that I'm dimensioning and setting tolerances on. Some of the dimensions/features have engineering requirements (e.g. press fit) and I have the tolerances set correctly (e.g. H7).
But I ...
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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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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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Coplanarity Profile Callout Confusion
From Krulikowski (1997), the callout for several coplanar surfaces using the Profile symbol is done by using two surfaces to establish datum plane A-B and then tolerancing the remaining coplanar ...
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P&ID Symbol Identification Question
Does anyone know what these three symbols are? I am working to identify them but they do not seem to appear in the site: https://www.edrawsoft.com/pid-legend.php
Does anyone know a better reference ...
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How to calculate the dimensions of an ellipse in a multi-view projection
The following image is an example that will help to demonstrate what i am saying and this below is a blender image version of an object with a slant surface at the top.
to draw the multi view ...
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Solidworks - Projected Curve is incomplete
-- This issue might be due to a bug in SolidWorks 2014 SP2 --
I'm trying to route a water hose from one location to another without passing through a keepout area (the red box shown).
I am simply ...
user6335
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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 ...
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How are NPT hole features defined?
I'll be the first to admit that I have always been somewhat confused by best-practice dimensioning standards surrounding pipe threads. While there is a decent amount of literature available online, (...
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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/...
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Dimensioning holes through a hollow shaft
I have three types of holes in a hollow shaft that are perpendicular to the shaft. The first type of hole go only through to the centerline. The second type go all the way through (i.e. out the other ...
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In freecad, how do you copy a sketch geometry from one plane to another?
I'm using FreeCAD, and I would like to copy all the geometry in a 2D sketch to another plane. So you have a 2D drawing on XY, and you want the same geometry to be copied to XZ. I can't seem to find an ...
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Differentiating between Two Orthographic Projections
I came across the infamous control handle assembly in two different books, referencing the views differently. One of the had it like the following photo
The other book labelled the side view in this ...
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What does C20019 IN PAIRS AT 900 MAX CTS WITH 2 ROWS OF BRIDGING AT 1/3 POINTS mean in a technical drawing?
Specifically, does in pairs mean that there are 2 C20019 members per indicated line on a technical drawing?
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Go-to resource for open hardware engineering resources? [closed]
If you would search for open source software projects, you'd probably run into GitHub and BitBucket.
Is there a similar site/community around open hardware to share and version CAD files, curcuits, ...
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What is the minor diameter of a thread in terms of its nominal diameter and pitch?
I'm trying to find the formula for calculating the tensile stress area of a bolt. According to page 1528 of The Machinery's Handbook (29th Ed.), that formula is given as
$$
A_S=\frac{\pi}{4}\left(\...
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Servo drive gear placement relative to the body
Is there a universal rule for servo drive gear placement?
I'm planning to use this servo for a robotics project, but I need to know exactly where the drive gear is located relative to the body. The ...
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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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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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Explain tolerances in technical drawing
I'm not a mechanical engineer and am not used to looking at mechanical drawings. I'm trying to understand what these tolerance features mean.
There is a positional tolerance feature, which ...
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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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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 ...
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Connector drawing - please help find C abbreviation/symbol meaning
Please help me to identify what C5 stands for in this picture. Full drawing is available here.
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Convert .dxf file to .svg
I'm an software dev and my job is to convert a .dxf file into a .svg file
My code actually works, but there are some issues with the dimensions or something similar. Unfortunately, i have no ...
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What software is used for drawing dynamic & mechanical diagrams? [closed]
I need to sketch some diagrams involving basic symbols like springs and dampers, specifying angles, perpendicularity etc... something like the images below:
Obviously my first option was word, then ...
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Can every 3D object be properly "described" by three 2D planes ( top, front and right view)?
In technical drawing 3D object is "described" with three 2D planes (top, front and right side plane).
Can every 3D object be properly "described" with these three 2D planes ?
If ...
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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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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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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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Meaning of a symbol for a hole specification in a drawing
A very simple question, so sorry for this, but I have searched many online docs and cannot find a simple answer. I have a hole specification of 3.4 + 0.13 (picture attached).
What does the +0.13 mean?
...
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What does P0.35 stand for in a Tech drawing for a Bolt
Got a Tech Drawing today with measurements and all that. I understand everything except for one part where they've specified a bolt with M4 P=0.35. The M part I get but what does the P specify?
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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 ...
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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 ...
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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 ...
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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 ...
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Autodesk inventor create rib feature failed
It's been kind of painful to create a rib I'm new to inventor while I was trying to create a rib symmetric about the YZ Plane this error keeps popping up
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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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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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