Skip to main content
6 votes

What does "do not scale drawing" in a drawing sheet mean?

This is information to be shown on the printed copy - it is telling the reader to please not print this A1 drawing sheet on A4 paper, or else the information you have highlighted "Scale 1:8" would not ...
Jonathan R Swift's user avatar
6 votes
Accepted

How to indicate bolt direction on a drawing?

In structural construction, if it doesn't matter, it is left up to the contractor to put the bolts in however makes it easier for them. If it matters for some reason (clearance, aesthetics, etc.) then ...
hazzey's user avatar
  • 10.7k
6 votes
Accepted

Can you help me to interpret technical drawings?

50 and 22 refer to diameters of the conical bit. Usually in axisymmetric objects you denote diameters. It is the same as the 36 and 45 diameters (which are more easily understood). So it is: $$\sqrt{\...
NMech's user avatar
  • 24.3k
5 votes
Accepted

Meaning of quarter hole color fill in drawing

They are just identifiers for different types of holes. If the same symbol was used for every hole then every hole would need the size specified beside it if there was more than one type. With ...
DKNguyen's user avatar
  • 5,621
5 votes

what does four 8-32 holes on a 50mm bolt circle mean in this diagram? This drawing is for an ampflow E30-400-24 dc motor

The diameter of those four holes is specified by the designator "8-32" which means standard screw diameter #8, threaded to 32 threads per inch. This is the usual way threaded holes are ...
niels nielsen's user avatar
5 votes

In which file format are technical drawings saved/stored? How can the data be exchanged between other software?

As your tags indicate AutoCAD, the answer is going to be directed in that direction. Data eXchange Format (.DXF) files are created by the source software. The receiving software has to permit import ...
fred_dot_u's user avatar
  • 7,122
5 votes
Accepted

What does this line with cross means in the blueprint?

The symbol or variable for diameter, ⌀, is sometimes used in technical drawings or specifications as a prefix or suffix for a number (e.g. "⌀ 55 mm"), indicating that it represents diameter. ...
Transistor's user avatar
  • 10.8k
4 votes
Accepted

What software is used for drawing dynamic & mechanical diagrams?

This is more of a long comment than an answer as i can not advice any specific software. First, if you intend to do anything professional in print or web productions than yous shouldn't be looking in ...
joojaa's user avatar
  • 3,577
4 votes

Explain tolerances in technical drawing

It says the flats shall be within 0.100 units of radial dimension positioned with reference to 'A'. i.e. if you were to make the rim which is a perfect circle, then mill the flats at the three ...
Donald Gibson's user avatar
4 votes

Can you help interpret hand-drawn technical drawing?

I have made a 3D model of my best guess for this model from your drawing. I've then generated a crib-sheet for the computer generated standard views (first angle projection, as per your sketch), and ...
Jonathan R Swift's user avatar
4 votes
Accepted

What does "h2" mean on technical drawing?

H2 refers to the tolerance of the hole - whether it’s an upper or lower case letter shows if it’s a hole or shaft tolerance. In this case, as you mention it’s on a hole, I would expect it to be “H6”, ...
Jonathan R Swift's user avatar
4 votes
Accepted

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
  • 24.3k
4 votes
Accepted

How do I interpret a fillet indication on a technical drawing

Measure 12.7 from both edges and the intersection gives the radius centre.
Solar Mike's user avatar
  • 15.8k
4 votes
Accepted

Connector drawing - please help find C abbreviation/symbol meaning

The "C5" annotation in this example refers to a "5mm Champher". It's important to note, however, that this is non-standard notation. I have included an example below with the ...
Jonathan R Swift's user avatar
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
  • 8,174
4 votes
Accepted

Shape of the shaft of knurling device

Yes, it would be easier to drill the hole but there are other reasons. It's makes the shaft the same width as the red bearing also clamped by the green sides. The shaft will experience torque when ...
Transistor's user avatar
  • 10.8k
4 votes
Accepted

What are these hidden lines tangent to the circle?

This is just a stiffener that goes around the cylinder that runs across the walls Section View FUll isometric view
NMech's user avatar
  • 24.3k
3 votes
Accepted

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
Accepted

Is the diameter before knurling assumed to be the same as diameter after knurling?

Knurling affects the roughness of a surface, but does not affect its diameter much. No material is removed, so for every indentation, a ridge is formed. This has the effect of making the measured ...
Jonathan R Swift's user avatar
3 votes
Accepted

What does P0.35 stand for in a Tech drawing for a Bolt

I would go with Pitch of 0.35mm ie 1 turn advances by 0.35mm A view of the drawing may clarify this.
Solar Mike's user avatar
  • 15.8k
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

Please Help me Read this Engineering Drawing

Bottom or left based on what datum? It matters not, really. The end of the shaft visible in the photo is your mounting area. The drawing shows two sets of mounting bolt options. The inner circle ...
fred_dot_u's user avatar
  • 7,122
3 votes
Accepted

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

Why is the left-side view called like that?

This is a question of "my left or your left". Imagine standing and facing somebody, as if looking in a mirror. Now imagine the person in front of you saying "look left". Which way should you turn ...
Jonathan R Swift's user avatar
3 votes

What is an acceptable tolerance for a non-engineering dimension

There are general tolerances, often defined for different industries. You cannot expect that a surgical instrument is designed with the same general tolerances as a drilling rig. If you have found a ...
useless-machine's user avatar
3 votes
Accepted

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
Accepted

What does this P&ID symbol represent?

From Tip #16 — What is the condition of your diamonds? Example d), as I’m sure you can easily figure out, is a heater. With all other things being equal, this one shows the inward arrows adding ...
StainlessSteelRat's user avatar
3 votes
Accepted

Notation of a technical drawing

1/16" refers to the thickness of the circle containing the letters, which appears to be 4 3/8" diameter. 1/8" refers to the radius of the cylinder top under the lettered circle. If your ...
fred_dot_u's user avatar
  • 7,122

Only top scored, non community-wiki answers of a minimum length are eligible