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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.

83 questions
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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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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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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 surfaces associated with a single directly toleranced…
marshmellow
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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 American, would follow ANSI as opposed to ISO. Such as…
TwoWaySpeedOfLight
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Difference between "Design Dwg." and "Mfg.Dwg."

From an Inspection and Test Checklist for flange heaters (the number is the same on both lines): I wonder what the difference between "Design Drawing" (or is it "Drawings"?) and "Manufacturing Drawing(s)" is. Is it that Mfg. Dwg. merely…
CopperKettle
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What's the purpose of cavalier and cabinet in oblique projection?

I really don't know why one person should create cavalier and the other one should create cabinet when it comes to oblique projection, are there any reasons why one should use cavalier instead of cabinet and vice versa?
Cary Bondoc
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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 can smooth out an edge using a chamfer or a…
Mutant Bob
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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 means the same thing?
TwoWaySpeedOfLight
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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 length of the cylinder then they seem like they…
marshmellow
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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 (phi) when they should have used Ø, or is this…
type_outcast
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Default multiview projection schemes

"... a multiview projection is a technique of illustration by which a standardized series of orthographic two-dimensional pictures is constructed to represent the form of a three-dimensional object. Up to six pictures of an object are produced…
Ghanima
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What is this drawing style that faces the x-y plane but stylisticly pulls the z axis down and to the left?

Notice that x and y are proportionally equal and perpendicular to your line of sight, but z is not. It's not 30-90-30 isometric. Also z should actually be pointing right at you rather than down and to the left if this was true 3D rendering. Hence…
candied_orange
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Hypocycloid degenerates to straight line

Can someone please explain if the hypocycloid described below would degenerate to a line. If possible, can someone provide an actual plot of the entire question? The scenario is as follows: A circle starts rolling on a flat surface. After it…
pulsejet
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Interpretting a Part Section

I have to draw a part sectional view of a valve for a project. A 3D view of the valve is supplied and a line AB denotes where the part section is to be. It says: "The part section is to be to the left of AB" Does this mean to section part of the…
Alex
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How do I fix a technical drawing pen with a bent needle?

I accidentally dropped my Mars Matic 0.5mm and noticed that maybe I broke the needle. I was having a hard time writing with it so I tried to clean it, and while cleaning I accidentally bent the needle part. After all the trouble that I experienced I…
Cary Bondoc
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