Questions tagged [drafting]
Questions about tools and techniques for technical drawing. If your problem is mainly with a particular software package, consider using a tag for that software package instead.
82
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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 (...
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30
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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 ...
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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 ...
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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 ...
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My corner is too pointy in freecad; Which dress-up will make it less dangerous?
I am a beginner at freecad and I have created a protective case to carry AA batteries in my backpack.
Unfortunately, after 3D printing I realized some of its corners are alarmingly pointy. I know I ...
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2
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347
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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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137
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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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39
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Thread indicator and modelling
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 ...
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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 ...
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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 (...
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1
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161
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how do you define tolerances for moving parts so that they work properly?
I have a mechanism in CAD that I want to either 3D print or CNC mill. When I went to the school's shop the tech asked me what the tolerances of my parts where and I had no idea. How do I go about ...
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Help with engineering graphics
Please redirect me if this is the wrong place to post this, however I've been having issues with something for engineering graphics classes and need some help
I'm supposed to draw two intersecting ...
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434
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What GD&T methodology should I use to specify alignment of two holes perpendicular to a shaft?
A round shaft 120mm long has two holes; one 10 mm from the end, the second 80 mm from the end. Each hole is perpendicular to the shaft's length. And here's the problem: the center line of both holes ...
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2
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254
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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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5
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Are un-dimensioned orthographic views permitted on a standard drawing?
If I remember correctly, best practice on a drawing is if you fully dimension a part in two out of three orthographic views you don’t include a third view with no dimensions. Is this a documented ...
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1
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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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10
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How did mechanical engineers work before SolidWorks?
I am studying a bunch of stuff related to mechanical engineering and am considering an eventual switch to the field after taking the necessary classes. I'm older, and I took drafting classes in high ...
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1
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171
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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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108
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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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161
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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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1
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123
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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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56
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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
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207
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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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2
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101
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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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97
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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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107
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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
answer
88
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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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2
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338
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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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180
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Why is locating a feature using directly toleranced dimensions not recommended?
Reading through ASME Y14-5 I noticed a Note in para 2.6 "NOTE: When basic dimensions are used, there is no accumulation of tolerances. A geometric tolerance is required to create the tolerance ...
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2
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327
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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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1
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Does ASME follow the ANSI standard, the ISO standard, or neither (both work)?
I was looking through AMSE Y14-5 and noticed that they tend to use diameter symbols in their drawings, which is indicative of an ISO standard.
However, I always thought that ASME Y14-5, being ...
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3
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1k
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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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1k
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What's the difference between a dowel pin symbol on a hole, and just a regular hole?
I noticed that sometimes I would see holes labelled like this:
but most of the times, they would be drawn "normally", like this:
Why would someone use a dowel pin symbol if a regular hole ...
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1
answer
57
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Is sphericity the same as profile?
I have to inspect a sphere on a CMM, and the standard states that the "Sphericity must be within 0.02mm". I am using a Zeiss CMM, and it does not have a 'sphericity' inspection method, but ...
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110
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Applying ISO fits to radial bearings
Do you need to take the bearing size tolerance into account when creating the tolerances for the mating hole/shaft when using ISO 286 tolerances?
For example, a 125 mm OD bearing with a desired H7 ...
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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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3
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2k
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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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3k
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Converting multiview drawing to isometric drawing
Please help me answer this. There is more to this but I just need to know the trick so I can answer the rest please.
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1
answer
111
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Where can I find technical drawings for computer parts?
I want to 3d print a custom computer case, I have the skillset to do so, however, I do not know where to find the technical drawings required. I need drawings for a 280mm Radiator, an ITX Motherboard, ...
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GD&T Is this a regular feature of size?
From ASME-Y14.5, a regular feature of size is defined as "one cylindrical surface, a spherical surface, a circular element, or a set of two opposed parallel line elements or opposed parallel ...
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551
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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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GD&T What is the difference between circularity and cylindricity?
Here is an image from Shigley's Mechanical Engineering Design about circularity...
Now here is another image from the same textbook about cylindricity...
If circularity applies along the entire ...
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What shape does a rod bend into when you push the ends together?
If I have a uniform rod --
And then I push on each end toward the center >--<
So it bends ...
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52
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Is there a standard for where treelines are drawn?
On surveys and site plans, I've often found treelines. These look like the below image, and serve to delineate in a very approximate way the areas full of trees and those that aren't:
Is there a ...
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visualization of intersection of two objects [closed]
This is from a design entrance that I am preparing for. I know it's a little different than a theoretical projection drawing that engineering books usually cover. It is more practical and ...
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1
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118
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Help interpreting dimensions from this drawing
Why there are different dimensions for the same measurements on this drawing?
For example 0.127mils and 0.097 mils pin to pin. Or highlighted 405 and 385 mils.
I can't find anything on the datasheet ...
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981
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What standards apply when specifying coating/painting in a mechanical part drawing?
I have produced a part drawing which calls up a machined mark on a flat surface, and the supplier has manufactured the part with this surface painted. I haven't added a note to the drawing that says ...
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1
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2k
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Lowercase phi (φ) seemingly used for diameter in diagram instead of Ø?
On a technical drawing for resistors, the lead diameter was given as $\varphi 0.55\text{mm}$. Since they also specify the wire is 24 SWG, and 24 SWG is a diameter of 0.559mm, did they simply use φ (...
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How to communicate to keep original dimensions of a part in a technical drawing?
Example: let's say that I have a rectangular part that I would like machined. I'd like to cut it to change the length, but the width and thickness are fine as is. The width and thickness are not nice ...
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