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Engineering Stack Exchange

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.

78 questions
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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 school and part of college. I'm familiar with the…
CL40
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Schematic Diagrams for Mechanical Systems

Is there some sort of equivalent standardized schematical (topological) diagram -such as Piping and Instrumentation Diagram, Electrical Schematics, Process Flow Diagrams, etc.- for the realm of mechanical engineering? I just need to draw the overall…
joojaa
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7
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Using a pattern of features as datum BOTH individually and as a group, for different FCFs

The quick: I've come up with a handful of possible options for how to structure the Datum Reference Frames (DRFs) and Feature Control Frames (FCFs) for this part. I've narrowed it down to the two shown below, but I don't know which is better, or if…
CBRF23
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6
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I-beam annotation for tube on drawing

I have been sent a clip of a drawing with the following annotations on it, but I've never seen them before and can't figure out what they mean. Is there a standard interpretation of these callouts? Initially I thought that they might be some…
Ethan48
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2 answers

(de facto) Standards for freehand technical lettering?

What de facto standards or otherwise exist that prescribe a style for freehand technical lettering? With the ubiquity of CAD there is probably a diminished need for standardized handwriting. Technical lettering was not part of my undergraduate…
ebpa
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5
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1 answer

Wood roof specs on engineering drawing

I am trying to decipher some as-built drawings for an old wood frame building. The purpose is to generate a preliminary load takeoff. I cannot figure out what the following is saying: It looks like "3 Ply Built up roof " but the rest makes no…
user32882
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5
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2 answers

Why choose approximation over interpolation to implement digital lofting?

Before widespread use of digital computers lofting was done using a thin flexible strip, called spline, held in place by a series of weights. This technique is a type of interpolation (curve exactly passes over sample points) using a physical analog…
user3368561
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5 answers

Is it possible to remove Staedtler ink from a paper?

I am practicing engineering drafting and sometimes I am near on finishing my work but suddenly I make a mistake. Is it possible to remove the ink? If yes, how? Where can I buy such tools? I am using a Staedtler's Mars Matic 0.5mm.
Cary Bondoc
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4
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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 firmware revision of this product in the drawing. I'm…
Optimum
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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, and various other parts.
ManquX
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4
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How does a dimension like "2-Ø12X25L" describe an oval hole?

This is a schematic for a plastic piece that has an oval hole on it. I understand that the Ø12 part of the measurement is for a diameter, but I do not understand what the "X25L" at the end is indicating nor do I understand the "2-" at the beginning.…
user2544028
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4
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6 answers

Do I need to mention every dimension on a to-scale drawing?

I'm my engineering drawing course, do I need to mention and show every dimension in the diagram if I've drawn everything to scale and also written the scale below?
pulsejet
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3
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Orthographic project (section view) dimensioning a counter bore?

The following question was given in a book as an autocad assignment. The section depicted in the diagram is not a counter-bore or a spot face hole. But the professor is telling that the hole is a counter bore. This is the correction suggested by…
Vinay5forPrime
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2 answers

Principle behind the geometric method for constructing a regular pentagon

I want to ask about the principle or the idea that people who invented the geometric method of drawing a regular pentagon depended on. I know how to follow the steps described below to draw the pentagon but I want to know how these steps led us to a…
صهيب أبو ريدة
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1 answer

AutoCAD .DWF Circle Output Meaning

My drafting program outputs a .dwf format file. In it, arcs are encoded as (Circle 602331619,844923003 537072960 32715,65588) where my so-far affirmed interpretation is (Circle, X-center,Y-center Angle Unknown1,Unknown2). The image for the arc is…
ExternCowWindows
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