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Questions tagged [technical-drawing]

Technical drawing, drafting or drawing, is the act and discipline of composing drawings that visually communicate how something functions or is constructed.

Read more on Wikipedia.

138 questions
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Meaning of quarter hole color fill in drawing

In this drawing 4 of the holes have the top left quarter filled in black. What is the meaning of that? It it some special type of hole? The drawing is from a Waveguide and in the specs it says Flange type FDP32 (Cover) So I'm thinking it might be…
Sembei Norimaki
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How to indicate bolt direction on a drawing?

Consider the following steelwork drawing: The location of the 6 no. M12 bolts are indicated with a circle and cross. However, it is not clear whether the shank of the bolts should point into or out of the page. Without explicitly drawing the nut…
egg
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What does "do not scale drawing" in a drawing sheet mean?

I opened a new sheet in Solidworks drawing, in the title block, there was a field written "Do not scale drawing". What does that mean? There is a scale already being chosen over there. It was just a new sheet and the default title box appeared. I…
Ahmed
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Best Practice for Tracking Vendor Firmware Rev

My employer has had me create a model of a vendor product (using OnShape) and make a simple drawing with some overall dimensions that we can hand to customers. However, they want to include the firmware revision of this product in the drawing. I'm…
Optimum
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Is the diameter before knurling assumed to be the same as diameter after knurling?

If the diameter before knurling is 80. Is the knurled diameter also 80?
user154844
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What does an E in a circle after a diameter mean?

I’m pretty sure it’s something to do with the fitting, possibly specifying to use the minimum circumscribed or maximum inscribed circle to tolerance the diameter but I can’t remember. The tolerance would be in the form ⌀123 ± 0.01 Ⓔ In case the…
Notts90
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How to model Motor Windings in Solidworks?

I want to model a DC motor in order to eventually do some simulations (temperature/cooling related) and I'm wondering what is the best way to model the motor windings? I've seen a few video's on how others have done it but these only model 1 layer…
Maarten -Monica for president
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Go-to resource for open hardware engineering resources?

If you would search for open source software projects, you'd probably run into GitHub and BitBucket. Is there a similar site/community around open hardware to share and version CAD files, curcuits, etc. (not modeling software but an open hardware…
J. Doe
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Rule of Tens/Ten to 1 Rule in Measurement and Inspection

I'm trying to clarify my understanding about the requirements [read: best practices] for measurement resolution and measurement confidence. The "Rule of 10s" is a commonly tossed around guideline for measurement resolution that, to the best of my…
Argonax
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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 dimensioning them? Take, for example, the part…
Argonax
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How to display an adiabatic boundary condition in a diagram?

I want to create a diagram. It will consist of a plate with a uniform heat load, a heat sink, and an adiabatic boundary condition. I thought of displaying the sink as a rigid attachment (as in mechanical problems). My question is: how do I display…
H. Vabri
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How to place a chamfer on the end of an angle cut pipe

Background The part above is from 1944 V2 plans which I am using as real world practice examples to teach myself 3D modeling using Inventor LT 2021. Therefore there is no original designer/engineer I could got to for clarification. I know how I…
Forward Ed
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What are these hidden lines tangent to the circle?

I don't understand what the hidden lines are nor the fillets tangent to the center line of the circles if someone can help with the 3d isometric that would help a lot.
Youssef Mohamed
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Can you help me to interpret technical drawings?

I'm trying to find out the angle/ length of the oblique line, or the solid angle of the conic part. This is what I've tried so far: According to the pythagorus theorem the length of the line is equal to: $$\sqrt{(50-22)^2+14^2}$$ but obviously this…
Sam B
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Steel beam size

I'm a customer not an engineer! I had 2 sets of drawings for a project to put in bi fold doors. The original drawing had a beam of 230mm and then the engineer sent a revision with a beam 260mm. The expanse is 4.3 metres on a brick built UK, 2 storey…
Caroline
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