41 votes
Accepted

How did mechanical engineers work before SolidWorks?

At the beginning of my career (1979) as a design engineer at HP, the mechanical engineer created the part design and then rendered it in pencil on paper, and then transferred it onto sheets of vellum ...
niels nielsen's user avatar
17 votes

How did mechanical engineers work before SolidWorks?

In the offices I worked in, drafters were also expected to have a grasp of the trades required to build the thing they were drawing. They'd have some background in welding, fitting, and fabrication. ...
Jason's user avatar
  • 271
9 votes
Accepted

Is it possible to remove Staedtler ink from a paper?

To remove such ink it needs to scraped off, usually with a scalpel blade. This works well on thicker and more studier media such as film or vellum, but it will always be obvious where the erasure was ...
Fred's user avatar
  • 9,667
7 votes
Accepted

Wood roof specs on engineering drawing

I am a practicing structural engineer with plenty of wood experience. That said, this is a bit of a tricky note because I believe it was probably written by an architect on a set of architectural ...
William S. Godfrey- S.E.'s user avatar
7 votes

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

I am not a professional engineer yet, but in my engineering design courses we were taught to show certain dimensions. For example, you choose a datum line and show certain dimensions. You don't need ...
masiewpao's user avatar
  • 313
7 votes

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

My general philosophy is that you don't need to dimension everything, you just need to dimension every unique feature. For instance, say you have a bolt pattern, with one hole in each corner. You ...
Chuck's user avatar
  • 3,565
7 votes

How do I read this engineering drawing for this screw?

Let's break it down: 5x - There are 5 of these holes, with the same dimension. You should be able to spot these fairly easily, as any similar holes with no dimensions on them. M4x0.7 - These holes ...
Jonathan R Swift's user avatar
5 votes
Accepted

Drawing the Connection of 2 Arcs with Radius

Arc 22 does not connect with arc 26 there is a straight horizontal line in between. The hint to this fact is in the width dimension of 44 that would not exist otherwise. There are further hints in the ...
joojaa's user avatar
  • 3,597
5 votes
Accepted

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

As with many questions, the real answer is "it depends." The biggest variables are what kind of engineer you are, who your audience is, and what industry you're working in. In a class ...
Ethan48's user avatar
  • 4,531
5 votes
Accepted

Difference between "Design Dwg." and "Mfg.Dwg."

This describes the difference. http://www.vista-industrial.com/blog/engineering-drawings-vs-manufacturing-drawings/ To summarize: A design drawing or engineering drawing is a complete specification ...
alephzero's user avatar
  • 12.5k
5 votes

Is it possible to remove Staedtler ink from a paper?

Is it possible to remove the ink? A quick Google search isn't turning up anything, as I more or less expected. Ink isn't meant to be erased, so I'm going to hazard that there is no product that will ...
grfrazee's user avatar
  • 3,587
5 votes
Accepted

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

The 1-1/4 drill is a reference to the diameter of the drill. The hole will have a radius of 5/8.
Dave Tweed's user avatar
  • 6,874
5 votes

How did mechanical engineers work before SolidWorks?

I think the duties that engineers have to perform are independent of the tools they use. Nowadays there seems to be a trend that everybody involved in a working process, regardless of if we are ...
pixelpoems.de's user avatar
5 votes

How did mechanical engineers work before SolidWorks?

But I am left with a question I don't have the answer to, nor the resources to answer it. These days it seems most mechanical engineers (at least the ones I know) are really performing the role of ...
NMech's user avatar
  • 24.3k
4 votes
Accepted

Schematic Diagrams for Mechanical Systems

The diagram most closely related to the original question seems to be a kinematic diagram. Kinematic diagrams are standardized in ISO 3952, although it seems that most often people are just copying ...
joojaa's user avatar
  • 3,597
4 votes

Working out functional gear in AutoCad

Gear design from scratch is a fairly major process in itself and so the vast majority of gears are made to standardised tooth profiles. Metric gears are usually designed to the module system. This ...
Chris Johns's user avatar
  • 15.2k
4 votes

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

Yes, with the caveat as supplied by masiewpao's answer that dims which can be calculated directly from supplied dims can be left off. The reason you must write in the dims is that "to scale" is purely ...
Carl Witthoft's user avatar
4 votes

Are un-dimensioned orthographic views permitted on a standard drawing?

My understanding is that redundancy and/or views that are not repeated should not be present in the a drawing. To put it another way: include only the necessary bits to have a complete picture. So, ...
NMech's user avatar
  • 24.3k
4 votes

Are un-dimensioned orthographic views permitted on a standard drawing?

Regarding the issue of repeat dimensions, at least for machine drawings as opposed to structural, reference dimensions (either in parentheses, or indicated like "12.34 REF") could be an ...
Pete W's user avatar
  • 1,541
3 votes

What is this drawing style that faces the x-y plane but stylisticly pulls the z axis down and to the left?

This appears to be a Cavalier projection since the oblique lines are at the same scale as the xy plane. The name comes from military fortifications - a "cavalier" was the French term for an artificial ...
alephzero's user avatar
  • 12.5k
3 votes

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

It very much depends on the context. Drawings are there for a purpose ie to communicate information and you need to keep that specific purpose in mind when producing the drawing. For example if you ...
Chris Johns's user avatar
  • 15.2k
3 votes

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

The process of creating an engineering drawing is called either technical drawing or drafting. How to draw is covered under the standard ISO 128. The separate drawings from different directions are ...
joojaa's user avatar
  • 3,597
3 votes

Working out functional gear in AutoCad

Involute spur gears have involute shape. This means that the point of contact between meshing teeth will move in a straight line (called the line of action). Visualized it will look like a string is ...
ratchet freak's user avatar
3 votes
Accepted

Convert 2D projections to 3D View in AutoCAD

I suggest you to watch these videos first: AutoCAD 2D to 3D Conversion Trick Learn how to take 2D drawing designs and ideas and turn them into 3D objects. ...
kfb's user avatar
  • 378
3 votes
Accepted

visualization of intersection of two objects

I don't want to spoil the fun of solving this for yourself so I offer the following suggestions: Redraw the assembly with all edges, including the hidden edges, shown as dotted lines. Draw solid ...
Transistor's user avatar
  • 10.6k
3 votes
Accepted

Is sphericity the same as profile?

One could argue that sphericity is a specific type of profile tolerance. You would just need to make sure perfectly opposing points on the surface (or as close to it as possible) are inspected to ...
jko's user avatar
  • 2,347
3 votes
Accepted

Finding the isometric view of an object from the front and right side view

My interpretation is the following (the dimensions are not exactly accurate).
NMech's user avatar
  • 24.3k
3 votes

How did mechanical engineers work before SolidWorks?

We didn't have to ask how to use our tools. This SE is filled with how do I... for Solidworks, Abaqus, Ansys APGL... I guess we spent more time drawing and calculating, versus figuring out how to ...
Tiger Guy's user avatar
  • 6,813
3 votes

How did mechanical engineers work before SolidWorks?

The mechanical engineer actually designs the thing. The draftsman's job was to render the engineer's intent in a drawing which is clear and unambiguous. So the engineer can say "yup, that's what ...
Harper - Reinstate Monica's user avatar
3 votes

Best Practice for Tracking Vendor Firmware Rev

Add the revision table, but make it a rolling table with e.g. max 5-10 rows, or whatever fits neatly on your drawing, where the oldest information gets pushed off the bottom/top of the table once it's ...
Jonathan R Swift's user avatar

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