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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.

1
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1answer
31 views

Two intersecting prisms

Case 1 The development of Case 1 of this problem in which the axes of the prisms intersect at right angles, is shown in Diagram 1. Note that inter-edge lines are required for the development of both ...
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0answers
71 views

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 ...
0
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1answer
40 views

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. ...
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1answer
41 views

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 ...
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1answer
518 views

Cannot Create Centerline between 2 Holes in Solidworks Drawing

I am new to Solidworks, my part has several holes (created using the Hole Wizard) which needs Centerlines drawn to connect them. However when I click on the Centerline tool in the Drawing, then ...
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2answers
34 views

What is the formal term/process for writing down a design?

I forgot what all of it is called but there's this specific way you draw the different components of a device or machine, kind of like blue prints but on plain write paper. You break the device down ...
3
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1answer
181 views

Drawing the Connection of 2 Arcs with Radius

I am supposed to be re-drawing this image to scale However when I Try to connect the arc R11 with arc R26 using the radius R22 I get a negative # in my calculations. i.e. R26-R22=(-4) Is there a ...
4
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6answers
2k views

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?
2
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1answer
3k views

Convert 2D projections to 3D View in AutoCAD

Suppose I have three 2D drawings prepared in AutoCAD LT. That 2D drawings are supposed to represent top, left and front projections of the 3D solid body. How can I view that 3D solid body?
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1answer
73 views

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 ...
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2answers
29 views

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 ...
1
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1answer
341 views

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 ...
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2answers
423 views

Working out functional gear in AutoCad

The title pretty much sums up the question, but basically I need to create 3 sizes of gears. I have tried 2 shapes, the first being basic rectangles. However, according to my Engineering teacher, ...
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2answers
100 views

(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. ...
1
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1answer
163 views

How can I match the angle of projection from a book illustration?

I have translated the part illustrated below into Solidworks but I haven't been able to match the angle of projection used in the illustration. How can I identify that angle used in the image, so ...
4
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1answer
270 views

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 ...
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2answers
576 views

What is the Radius of 1 and 1/4 inch drill on a 1 and 1/4 Circle

I have this figure for my engineering drawing I am currently taking this semester I am quite baffled about this $1\dfrac{1}{4}$ radius circle with $1\dfrac{1}{4}$ Drill hole. How do I do that? as a ...
12
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2answers
887 views

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 ...
6
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0answers
185 views

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? ...
6
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1answer
281 views

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 "...
1
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0answers
291 views

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 ...
0
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1answer
803 views

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 ...
4
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5answers
2k views

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 ...
1
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1answer
777 views

What are sectional views and cutting plane lines?

I am a student in a Drafting 1 class and we are going over all of the section views (full, half, revolved, offset, etc.) and also all about the cutting planes and different ways for that and how to do ...
0
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1answer
169 views

Where is the “angle” in the first, second, etc. angle projections?

This question is about engineering drawing and representing a 3D shape on a 2D paper, so there are "four" angles of projections which we can use to draw, but I'm not sure about that, and I don't ...
5
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1answer
164 views

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 ...
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0answers
109 views

Two intersecting prisms (typed and with diagrams)

Case 1 The development of Case 1 of this problem in which the axes of the prisms intersect at right angles, is shown in Diagram 1. Note that interedge lines are required for the development of ...
3
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2answers
637 views

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 ...
7
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1answer
1k views

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 ...
3
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1answer
126 views

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 ...
4
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2answers
2k views

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 ...