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- เผยแพร่เมื่อ 7 มิ.ย. 2024
- Making drawings is a skill that any practicing engineer needs to master. Unfortunately, it's not something that is taught very well in most engineering schools. In this video, we're going to try to demystify engineering drawings and give you some tips and best practices to make clear, complete drawings.
In this video, we'll discuss
- The different types of engineering drawings
- The features of a standards-compliant drawing template
- Choosing and placing views
- Strategies for dimensioning common features
- Tips to improve the clarity of your drawings
- The relevant ASME standards
- Example detail and assembly drawings of REAL parts
Companion blog post with reference sheet, sample drawings, and checklist:
tarkka.co/2019/04/28/engineer...
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Want more on Engineering Drawings? We just made a full 1.5 hour LinkedIn Learning course: Engineering Drawings for Manufacturing. You can find it on our website: www.tarkka.co/drawings Thank you all for the support, and we are coming out with more TH-cam videos soon!
As an engineer with 30+ years of experience the opening introduction to this is something I have preached for years. I did a degree in aerospace but have mainly worked in automation and control systems and have done literally 1000s of control system schematics and panel layouts. Look at a the description for this video
"Making drawings is a skill that any practicing engineer needs to master. Unfortunately, it's not something that is taught very well in most engineering schools." *THAT IS ABSOLUTELY TRUE.*
AutoCAD is brilliant and I love it but it has also caused a similar problem that Microsoft, Apple and others have caused with spell and grammar checkers. Its made engineers lazy and they DON'T CHECK what they have drawn often enough. Combined with the latest generations of CAM and CNC they just don't have to get a handle on things like tolerancing and functionality.
I see this all the time in automation. Badly toleranced designs where EVERY tolerance is 0.01mm or 0.001mm (micron) which is fine when your doing a one off on a CNC. *BUT* if it has to be done by hand then you are spending vast amounts of time doing things with NO BENEFIT. Worse if its for production runs then you are adding unnecessary CNC costs (in time) to each part.
Over in the control systems I see people make lazy blanket decisions on control wiring all the time and on large scale electrical and control projects the cost of copper (buying and installing) is sometimes as high as 70% of the entire cost. Big mine sites (and I have done a few) have incredible costs just in the power wiring and serious costs in the signal and sensor wiring. Most sensors need less than 30mA to operate so they don't need cables with 6 or 10A capacity. Most pneumatic solenoids operate less than 200mA and don't need wiring for 6 or 10A.
As I keep saying AutoCAD and all the similar packages are brilliant and magical and save heaps of time and energy and grief, but like anything they can make people lazy and that never ends well.
The part in the video where you talk about hand drafting is just so true. I see TOO MANY younger engineers who cannot do any drawing by hand. My favorite trick is to ask them where "layers" came from. I learned technical drawing just before CAD arrived so I have done it with "layers" of tracing paper.
Great video keep doing this sort of stuff it benefits all of us.
Great, but could you use clearer voices? And PLEASE, do not mix background music with voice. Trying to make sense of it is like trying to read from a page with insects crawling over it.
@@Gottenhimfella Well said. There are way too many people who think their sound track is more meaningful than information.
Is LinkedIn learning the same as Lynda? Because i have a lynda account from my school
Are you a couple?
I'm a mechanical engineer and former toolmaker and was expecting some clickbait, annoying youtube music video, but I was positively surprised. A lot of very good and helpful information for newcomers and unfortunately for some senior engineers too. Nice channel, keep it up.
Being a former toolmaker (tool and die here) gives you a huge leg up on most engineers with no shop floor experience. If I was in charge I would make it mandatory.
It's nothing that they wouldn't teach in first month on university...
@@jc438 yup here's the guy that makes needlessly tight tolerances and super fine finishes on parts... it's all the stupid machinist fault it's not on time or in budget right?
@@RubSomefastOnIt Good universities actually do that...either your worked as a toolmaker, technican, electrician or you have to do an internship while you're studying...at least it's like that in Germany :D
@@RubSomefastOnIt Why do you judge.
Learning about design is actually led from the production point of view, as design is serving production purposes, not opposite way.
The pace of narration...summed up very nicely........."tolerances that are unreasonably tight"
ah,..... ".00005" is one-half of 1 tenth of a thou! AKA 50 millionths !!
But the software works to .001mm. Lol.. We deal with this every day. On a 3d model, we would get a fillet rejected for a tiny patch being .002mm under.... So we tell them an end mill will not ever go under that number, so you are safe, and they look at you blankly. This is what happens when people have NO shop experience.
@@mmpiforall5913 Seems reasonable.... in a humidity controlled, temperature controlled environment, C0 ground/zero backlash ball screws on every axis, with prefect part/tool cooling and tools that are perfectly in spec and never wear down. Yup, that pretty much describes a machine shop.... HAHAHAHAHAA
@@henmich I've also had this, let's call it a bad habit, but then I understood that it was unreasonable. That probably looked very unprofessionaly, my thought was "so they can do 0.01mm, that's cool, let's place it almost everywhere, the part would be great" :D
@@henmich What software works to .001mm? CAM or CAD? 'cause I've never seen a CAD tool that hard clips at .001mm (I mean, it's practically useless, but hey.). It usually just rounds off to nearest .001mm
That's an international problem now: "Most universities do an awful job teaching the concept". Here in Chile, the same.
Its because they dont hire good engineers to teach. Most professors never grew up
Here in Russia, the same
Same here in the United States
I thought the problem was only in India; No one taught us Detailed drawings and everyone expects senior engineering graduates to be perfect with drawings.
@@smeetashar relatable
As a machinist I cannot thank you so much for making this. I hope all engineers heed this advice. I hate when a drawing is missing something and then I call the engineers and they get annoyed with me 🙄 like really
LAtely, I have had experiences where the model is given to the machinist and they are expected to find the missing dimensions by interrogating the model themselves. ASME Y14.41 along with Model Based Definition is supposed to help fix this issue, but I see it as adding an extra layer of complexity.
@BanquetOfTheLeviathan Draftsmen and designers don't really exist anymore. I'm a mech engineer at my company and I literally do everything.
It's 2AM. TH-cam, for the love of God, why did you recommend this video? Now I want to design brake calipers.
I worked as a draftsman, checker, engineer and even taught drafting in jr college. This is the best lesson I've ever seen anywhere. Excellent.
00:00 - Intro
01:36 - Drawing template
01:51 - Title Block on Engineering Drawings
02:04 - Blanket tolerances in Title Block
02:30 - Revision table & Note section
02:45 - Coordinate border legend
03:00 - Projection systems, view orientations & alignment
04:12 - Hidden Lines & Tangent Lines
04:45 - Dimensioning - Size, Position, & Placement
05:18 - Assumed dimensions
05:31 - Dimension selection
06:17 - Repeated features
06:34 - Indicating tighter tolerances
06:52 - Geometric dimensioning and tolerancing
07:43 - Best practices about arbitrary tight tolerances
07:50 - Indicating Surface Finishes & Seals
08:03 - More on the Note sections
08:40 - Flag notes
08:48 - Edge breaks and burr removal
09:24 - Assembly drawings recap
I felt more informed by this one video than the entire Drafting/CAD class I took
Same, youtube teaches you more than school does in 12 years.
@@UltraGamma25 Well maybe the german way to have a specific "vocational school" when you start an apprenticeship is not to bad. There u learn exactly this stuff and way more in detail than you do in university :)
@@Fragst3rDota I agree 100% on the apprenticeship idea. It's why Tradeschools are better
I'm not even in engineering, but I still watched the whole thing. Good job in condensing the information!
Just discovered your channel via your reddit post and let me just say this is THE channel I've always hoped for! Don't stop making videos, they're very helpful!
Best engineering channel hands down. Just stumbled across your o-ring video (knowing little to nothing about o-rings) and was blown away at the quality of information per second you were spitting out.
This is an under-appreciated channel. I hope you continue making more content
Thank you so much! We are working on more videos.
In the past you never had to take drafting classes to be a mechanical engineer. When the computer drawing systems came out, they fired all of the draftsmen and gave the engineers software manuals. The software manuals do not teach fits and clearances. If you do not understand fits and clearances you can not properly dimention a print. Frenches Engineering, And Gisec Mitchell and Spencer were my textbooks from the seventh grade to navy illustrator draftsman A school. Fits and clearances is based in the principal that "two objects can not occupy the same space at the same time".
This is actually an amazing small walkthrough of technical drawings, I had a class on it last semester in uni, and this is great for refreshing what I learned there.
As a machinist, I thank God for this video! Sending this to all of the engineers I work with 🙄 How annoying it is when I have to deal with engineers with no machining experience who draw parts that are near impossible to machine. Thank God for you guys making detailed explanation videos!!!
I am also mechanical engineer .
But i hate these drawings .
Excellent video. Sometimes it's satisfying to hear confirmation for even basic things you've always suspected but never been told.
I can not stress how much a channel like this was needed on TH-cam. Absalutely brilliant guys! My new favourite channel.
Great video. I'm going to make this video a part of my on boarding curriculum for new engineers.
Thank you so much. This is a great video. I'm a mechanical engineer student and I've had to struggle with the drawings, I'm sure you're gonna help other students with your work.
My solid modeling class was 2 years ago and only part of it concerned drawings. Thanks for the refresher!
I know I'm late, but my uni's CAD and machining courses were completely separate. So not many in CAD had ever seen a blueprint, and most in my machining classmates had never modeled in CAD. I did a crossover program.
This is very helpful, thank you. When I first had to create my first drawings, I struggled mightily with superfluous overload. I knew what I would want included but this seldom turned out to be what the machinist needed. The urge to just dimension everything ten times over becomes strong when you are frustrated. It took me way too long to discover how to chain dimensions properly. Even in retrospect, this information is valuable, so thanks again.
This is incredible content, guys. Keep it up! We want more.
Where have you guys been all my life?! This is amazing content. Thanks
You guys are actual heroes! Thank you so much for this video!
Thank you very much for sharing this video, I am a draftsman and looking forward to my studies in Mechanical Engineering, please continue to post more videos like this
This is a great video! Love the clarity and pace!
THIS IS A REVELATION. Why can't we have more educational material like this. I learned architecture HERE more than I did in five years. The representation and the object itself being discussed in parallel was a revelation.
I'm a mechanical engineer and this video was incredibly validating and informative, thank you :)
Guys superb job and an awesome channel. Keep coming!
My company needs to send all the engineers to remedial school and make them watch all your videos.
"Hey so this part that I'm making on a manual mill has a 0.171875" dimension, are you sure that's correct?"
"Oh yeah, just get it as close as possible it'll be fine."
because inches are stupid
@@bunnagautama3631 so you think if it were 4.365625 mm you could hit it on a manual mill?
We have parts that have drawings with .001mm tolerances on counter bores. Shit gets me every time I see them.
@@bunnagautama3631 In machining metric or imperial means precisely fuck all. You are working off of decimal numbers either way. You don't see a part dimensioned across multiple scales so metrics advantage is pointless.
Stunning vid! Would love to see more videos about engineering drawings and GD&T! You just earned a sub.
Just watched this video, many thanks. Keep the content coming!
Refreshingly informative and easy to follow. A very well done tutorial.
I am looking forward (and backward for items you have already produced) to more content. Thank you for expressing your talent and proclivities so professionally.
Great video! I'm a new engineer and found this to be a good refresher/reminder.
As machinist i'm really happy to see some good work thanks a lot !
I wish there are more videos like this for Architecture. I am an Architect, I don't know what I am doing here, but I love it.
I'd love to see a video on GD&T. I've just started learning it, and I can already see how powerful it is compared to just trying to control size tolerances everywhere. As an instructor put it "Tight tolerances just guarantee that a part will be expensive, not that it will fit"
GD&T position tolerance is coming up next!
Finally, I found what I want.
Awesome, simple and very helpful.
Thank you very much for such a great video.
I passed mechanical drawing with ease, learned the ISO norms. Now I'm here revisioning every theoretical subject and this video sparked me an interest to learn Asme norms.
I recently stumbled upon this video and i think i will stay for more. Good job :)
Love you two, please keep this up.
Great video those who are in the design field thank you so much tarkka.
Nice, I have been looking for exactly this topic, nice narration, soft voices. A pleasure watching and listening. +1
By far the most professional content on engineering drawing. Looking forward for more on GD&T.
Yeah, they use measuring tape when picking up reference point, indeed very professional.
@@thombaz the machinist used the measuring tape for rough raw material initial placement. I agree it was quite a visual contradiction to see a tape rule and a ball edge finder in the same clip. - not the fault of the video authors. I started my engineering career as a glass working technician, doing a stint in the drawing office ... i have no other way than perfect undisputable drawings, to get the parts i want. Overall a good video.
@@TAH1712 I am just playing the a-hole. When I learned machinig and some one come to the calss with a folding ruler in his pocket. It was a good laugh when he grabed it for mesuring
@@thombaz haha...
Awesome video, super clear and packed with useful info
i am a mechanical engineer, 11 years experience. i was waiting for some mess ups in this video but didn't hear any! excellent work.
I especially agree about avoiding putting TYP everywhere on a drawing. Some of the older engineers really lean on that one really hard lol.
the only thing i'd add is that regardless of what the standard is, some engineering places just have a house style, and even though it's not always correct correct sometimes, trying not to rock the boat too much is usually the best thing from an organizational perspective.
This is excellent advice that can be applied to many facets of one's career.
Better listen again then. Per ASME 14.2: "Hidden lines should be
omitted when their use is not required for the clarity of the drawing."
@@spec24 there were some pedantic statements, but more often than not I find that the standard conflicts itself on such nuanced details of low importance. e.g. reference dimensions are described as *requiring* inclusion of the tolerance range specified by the driving dimensions, and also described as being inconsequential to the specification; that's incongruent.
I’m a retired toolmaker and Project General Forman in the marine repair/ large shipbuilding industry. I despise poor engineering direction. Most of which can almost always be broken down to poor attention to detail. These folks are solid. Only thing I didn’t like was their take on “typ”. I find it useful/necessary to clean up cluttered dwgs, say...items with many redundant specs like large flange bolt holes or tube dimensions for heat exchangers for example. There might be 12 typicals to keep straight but those could easily represent thousands of dimension instructions. I’d make my apprentices watch these guys as well as my jr engineers.
One reason us old guys lean on “typ” hard because printed drawings get folded on the job site and tended to wear away the ink in the creases. Reading drawings used to be much more interesting before screens became prevalent. We could just zoom in to clarify either if things got packed in to tight.
Thank you! you don't know how long this has been bugging me
Ga Tech representing! Nice work!
You guys are like the Mango Street of Mechanical Engineering. I absolutely love your videos.
Thanks!
Some of the best videos on the interwebs.
Very good information. There are a lot of modeling tutorials on the web, but very little about drawing. People don't seem to like it that much. But it is so important.
Extremely excellent!! Thanks
I started my job as a design engineer in April and didn't know squat about drawing. I learned more or less everything this video covered and more by constantly asking my co-worker's opinions on my drawings and reading the machinist handbook. I still make mistakes all the time, but I'm learning as I go.
New subscriber. Looking forward to more of your excellent videos.
I just watched this for the hell of it, very informative and will watch your other videos too; subscribed.
I'm a welder by trade, and am wanting to further my skillset getting into machining and CAD, and this brings up a lot of nuances I do (but don't) think about, being self-taught. I've had many subpar prints, so there's a lot of things I think about/do to make manufacturing down the line as easy as possible. Field experience should be a must for engineers, it will make you better.
Fall in love with inventor lot of years ago....best cad ever
This video is AWESOME! I work for a sheet metal fab shop and deal with these exact problems every single day! When is the sheet metal version of this vid coming out?
Great and informative video! I will be showing my students. Thanks for all the effort
Awesome video! Very informative and summed.
Can't decide what's more efficient, the drawings or this narration
thank you for bring that green book earlier in the clip, i have been looking for it but wouldnt remember the name of that book! i lost it in the flood years ago by a good teacher who recommend me that book in high school - that was 30 years ago!!! good presentation!
When we started with isometric drawing, we'd put three side-views on the sides of a rectangular prism and figure out the shape. I started to see the different views of a part as the net of such a prism folding out. 3rd-angle view looked pretty weird to me, for quite a while. Thanks for reading my blog.
Educational! Thank you for making this video 👍🏻
Great video, thank you!
Phenomenal. Thank you so much for sharing true engineering drawing knowledge!!
Great work! Need more such informative videos..
Very good content. Subscribed!
Great content! Thank you!
awesome don't have words do explain how awesome this channel is
Quality, precise, exact to the point video....Great content. Please cover GD&T also. Thanks
Super useful video. Thank you!
Good video. I really recommend using ISO 1302 for specifing your surface. The shown way is way to general. Also for breaking the edges there´s another standard ISO 13715 where you can define both outer and inner edges in a very elegant way.
I'm not an engineer, nor did I understand a word of what they were talking about, but I'm glad TH-cam recommended the video. I subscribed, because why not, right?
Great video. As an engineering drawing pedant, trained in British/ISO Standards, I see many details where we differ, but they really are only details. The overall content here is going to be valuable on both sides of The Pond.
And you have at leat one viewer here who appreciates the speed of narration. I routinely play videos and podcasts at 1.25x to 2x speed, but not yours.
I'm getting profiled by the YT algorithm. I'm using this to procrastinate finishing all of my drawings for my cad class's final project.
Amazing video. As other said, I also expected some clickbaity video with zero content and just someone making "pretty" drawings that no machinist should ever have the misfortune of getting in his/her hands, but it was an excellent summation of some of the most important aspects of making good drawings. Great work and I'm looking forward to more of this type of content!
These videos are incredible wow thank you so much
1:51 George P. Burdell (+ George W. Woodruff and Henry Ford)!!!
Currently studying Mech Eng. THWG!
That aside, this video is exceptionally well-made. The information was very helpful in filling some gaps I had from my engineering graphics course.
Great high-quality video. A must-see for any starting engineer. .)
Great work ♥️👌
Excellent video!
I literally got so excited when I saw the reference dimension and don't know why.
Thank you it's very helpful ❤️👍
Good video. The best design engineers are those that have actually, physically made things.
Minimum dimensioned drawing is preferred for more complex designs. You basically provide the STEP database model to the machine shop and have a default tolerance on the drawing. This prevents errors caused by the vendor remodeling the part based on the dimensions in the drawing. Any tolerance that is tighter than the standard tolerance would be specified on the drawing. Additional dimensions that need to be called out are dimensions referenced to anything other than the typical A,B, or C datums defined in the drawing. As for holes, we use a separate parametric table to show all the holes with a code. This way, a machinist only has to look up the hole code and the table for information. You can add additional information on the table such as geometric tolerances, inserts, and plating requirements.
The drawing is truly the language of industry. Today ASME Y14.5-2018 is common with "Geometric Tolerancing" as a true functional layout technique. A tolerance is best placed directly on the individual features. The part then can be applied based on the exact functional intent. Outsourcing to an outside manufacturing-shop is common with "GD&T" Geometric Dimensioning and Tolerancing. Your video is great!
T J (Tom) Vanderloop, Author, Mechanical Designer & Consultant; ATEA, AWS & SME-life Leader and Member.
Really great video. Wish i had found it years ago.
These are great. I would like to see the equivalent for architectural drawings.
nice video, it's the most ASMR video I've seen in a long time
Very cool. Wished I had found this when it first came out. Would have saved me alot of time as an entry-level designer. And lets be honest, its still saving me time now lol
This is a great video - a great find for a sophomore ME
Thank you so much sir for sharing this basic needs information thank you sir from India
Thank you!!!
Wonderful channel... post more videos please.
im using this video as reference, quality video.
As a mechanical engineer who has been held to the lowest standards for 3 years now. Starting at a new company where decent drawings are manditory, I will definitely be binge watching this channel and putting the advice to use.
ingenious !!, need more videos. can you pls add GD&T, how to select fits etc..
I just wish my collage professors were to the point like you do, would have saved me and countless others a lot of hassle.
Underrated job.