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5 votes
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Technical drawing for a part with complex (non-line, non-arc) geometry

You don't need to dimension it at all, because as you probably know, that part would never be manufactured by looking at the 2D. At my company, one of the standard notes we put on every drawing is "...
regdoug's user avatar
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4 votes
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Convert .dxf file to .svg

SVG and images in general define a coordinate system with positive x towards the right positive y towards the bottom I.e. the pixels with coordinate y=1 are near the top. On the other hand dwg, ...
NMech's user avatar
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4 votes

How to choose tolerance size?

I think you need to understand what a "tolerance" means in an assembly items. My token view is, a tolerance is the permissible deviation of a part from its ideal design dimension. ...
r13's user avatar
  • 8,227
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
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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
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3 votes
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Do drawing dimensions have to start from datum?

If the request is coming from whoever will be machining or inspecting the part, I would side with them. They know what they need to see to make sure the part ultimately meets the print. Also, since ...
jko's user avatar
  • 2,347
3 votes
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Understanding hole specifications

4 x means it applies to the four instances that look similar on the drawing. Ø 5 means the hole diameter (drill size) is 5mm. “Thru all” is added here to remove the requirement for a section view to ...
Jonathan R Swift's user avatar
3 votes
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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
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3 votes
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Drawing isometric from two orthographic views

Close! Figure 1. The error. Since there is no hidden line on the cut-away face then that edge must be in-line with the front edge. Project the bottom corner straight back as shown.
Transistor's user avatar
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3 votes
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What does an E in a circle after a diameter mean?

Like promised, I am now looking at EN ISO 14405-1:2016 where this E symbol (Ⓔ) is defined. More accurately is defined in section "3.8 envelope requirement". The upper value of a external feature ...
joojaa's user avatar
  • 3,577
3 votes

Top View,Front View,Left view and right view help

When you have an object to draw, you must follow some simple rules to explain your drawing for anyone to understand it easily. There are 2 example explanatory pictures below. Example 1 Example 2 ...
kfb's user avatar
  • 378
3 votes
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How to draw isometric view of this shape?

Don't think, look at the numbers! Drawing isometric, or any projective images for that matter is very straightforward. Just as long as you do not try to find a trick to make it easier. Just work out ...
joojaa's user avatar
  • 3,577
3 votes
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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
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3 votes
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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
  • 24.4k
3 votes

Why are there sometimes slash marks and sometimes arrows in dimension lines?

Slashes are accepted in the iso/ansi standards as alternative to arrows which are preferred. They have a few advantages over arrows, especially in hand drawn documents. I see these quite often in ...
joojaa's user avatar
  • 3,577
3 votes

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

For your example: The top view of the sheet metal (with "t" stated) will show all necessary information for fabrication. So, it can be a complete drawing by itself for documentation purposes....
r13's user avatar
  • 8,227
3 votes
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Can I omit the scale information in the technical drawing of a mildly complex mechanical part if I provide all of the necessary dimensions clearly?

You should not ommit the scale. Even if no one seems to read it, it is still important information. The task is quite trivial, I don't see any reason why to remove the scale because it can cause ...
loStraniero's user avatar
2 votes

Technical drawing for a part with complex (non-line, non-arc) geometry

You probably need some auxiliary sections as well as the three basic views. For example if you draw a section at mid-height looking down the axis, you can easily dimension the "straight" ribs. If you ...
alephzero's user avatar
  • 12.5k
2 votes

What does an E in a circle after a diameter mean?

The Ⓔ is one of the options in the "feature control frame" as defined in the ISO 8015 standard, or ASME Y14.5M. It stands for "envelope requirement." The basic idea is that the tolerance of the ...
alephzero's user avatar
  • 12.5k
2 votes

Technical Drawing: Labelling a component that's not part of my design but integral to my system

It is possible to use dashed lines for things that are in the image for reference, or not directly part of the item in the drawing. But in general adding something because you have blank space seems ...
joojaa's user avatar
  • 3,577
2 votes

Engineering Drawing-Projection of intersection curve of two standing cones

Have look at this and then see which intersections give you the points for the outline (this is not exact - just lines drawn on a simple graphics package... See:
Solar Mike's user avatar
  • 15.9k
2 votes

New Part Number for every firmware update?

If something is form-fit-function backward compatible with an earlier rev., then usually you can just bump the rev -- depending on your customer base. Most places that make changes as rapidly as you ...
TimWescott's user avatar
  • 2,682
2 votes

In what (free) software can I draw bodies in a 3D coordinate system?

For Windows, Linux and Mac, Solvespace will allow one to create three dimensional objects in a parametric as well as free-form manner. Text and dimensions are part of the program's features. The web ...
fred_dot_u's user avatar
  • 7,227
2 votes
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How to draw an arc through 2 known points and tangent to a line

After more than a few days with the wrong key words for a google search, I stumbled on the answer while trying to navigate to the math stack exchange...and the answer was some place completely ...
Forward Ed's user avatar
  • 1,221
2 votes

How to choose tolerance size?

This is a very difficult answer to answer within a single post but I'll give it a try. Tolerances, Cost and Machine capability The very first thing you need to remember is that tolerances are ...
NMech's user avatar
  • 24.4k
2 votes

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

I see 4-solutions. I added straight lines (in GIMP) to represent canted faces. Either the original posted by NMech along with either or both surfaces as canted are also viable alternatives. (As NMech ...
Jim Clark's user avatar
  • 496
2 votes
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How to Construct a Primary Auxiliary View given that an oblique surface with 6 sides

It's a tricky one. Figure 1. Your isometric is missing this line. Figure 2. A clue. The six-cornered shape is flat so it must be a plane going through these three points. Can you draw it? Figure 3. ...
Transistor's user avatar
  • 10.9k
2 votes
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How to place a sketch plane at a specific geometric location

tl;dr - add the fillets at the end. Step 1: Revolve. This should also include the R10 'lump' on the central axis. Step 2: Define the Elipse Taper. It's stated that the thickness is 11mm and 9.5mm ...
Jonathan R Swift's user avatar
2 votes

Why are there sometimes slash marks and sometimes arrows in dimension lines?

The slash is easier to draw, more forgiving as to where you draw it can be a bit off and nobody minds it. Also it looks more in harmony with the hand lettering we used to do on the days of real Blue ...
kamran's user avatar
  • 22.5k
2 votes

Why are there sometimes slash marks and sometimes arrows in dimension lines?

To my experience the slashes were mostly used by civil engineers and architects while the arrows are more common with mechanical engineers. Nowadays, I see more often the arrows. This is probably due ...
NMech's user avatar
  • 24.4k

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