Holier than Thou: Precision Holes by Drilling, Boring, and Reaming

[@mjones2431]

I've been a machinist and builder for 20 years and am now moving to engineering. This is some of the best content on youtube

[@CorndogBrownie]

Oh my goodness. as a machinist this is fantastic. Impossible holes, or ridiculous call outs kill shop time, and cost tons of money. More engineers need to watch this kind of stuff

[@iizvullok]

Oh yes. Especially if the part has very thin walls. Sometimes i have to do parts which have tight tolerances (something like 0.02mm) on the inside and outside diameter while having a wall thickness of only 1 or 2mm and a 50mm diameter on the inside. The part deflects a lot and that deflection has to be compensated for in the program. Micrometers are basically useless since they deform the part by up to 0.02mm while measuring. The ring gauge fits just fine by itself, the plug gauge also fits just fine, but they do not fit both at the same time. The quality control also has a hard time getting meaningful measurements because the part is not perfectly round after its finished. Then funny thing about this all: There are a bunch of similar parts which serve the exact same purpose but have 0.1mm tolerances which makes them much easier and cheaper to produce.

[@TheMetalButcher]

Engineer (and machinist) here. Watching it! Great stuff.

[@herrkulor3771]

Thankfully there are also parts that can help hold bearings in plastic and aluminium as those materials expand way more than the steel of the bearing. I don't know their englisch name, "Toleranzhülse" can be useful if you have no precision. Edit: so you don't need utter precision.

[@navyf4s]

Everyone in our shop needs to watch and learn from this video! Every engineer who what's something made needs to watch this.

[@alecpokrandt3322]

I miss your uploads, I literally rewatch your videos😭

[@juraterfan]

It's crazy how I learn more things on this channel than anywhere else, this is heaven for people who are interested in machining and engineering in general! Please make more videos!

[@gamingbros400]

Recently found your content on advice and got disappointed that the last upload was a year ago. But then I saw this and really happy. Great work guys, helping every trainee/university students to learn the details and less taught things. Cheers guys.

[@twistytriangle]

Thank you for this video. The SI unit mentioned while narration were especially helpful. Without it I would have no concept of the the dimension.

[@rc8rsracer1]

I’ve been machining 10 years and I agree with all of this! Well done!!

[@TheMetalButcher]

Same. Rare that I agree with everything in a machining video since it's so dependent on one's own style.

[@sharkbaitsurfer]

It takes true expertise and talent to explain such a potentially complex subject with such clarity - that was simply brilliant, brilliant work!

[@stochasticsignal1951]

It's been a while! I'm so glad to see some more from you guys. Your older videos are some of the best GD&T explanations I've ever seen.

[@scottw1808]

Couldn't agree more

[@dziggy3004]

THANK YOU! This is an awesome BOOTSTRAP VIDEO! Even for OLD DOGS continuing life's ventures into new learning territories! Despite cursory awareness of these metrology/machining techniques -- as I enter into the VASTLY CREATIVE "hobby world of reinventing the wheel" -- having now more than wet my feet with vast opportunities of solving problematic issues, wondering WHY someone hasn't ALREADY solved certain BASIC PROBLEMS -- this is so applicable at my stage to be introduced to, and to leverage this otherwise DARK KNOWLEDGE that was hidden from us novices! With the well-done visual aids, this breaks down and connects the controlling variables, and is definitely THE TEASER and POINTER for further exploration! I feel blessed by your HOLINESS! Again, thanks! Dave

[@MrShkolololo]

Wow! I'd never thought that technical details video on precise machining can be THAT interesting!

[@shiro-r4m]

Amazing, you guys actually went through the effort to machine a part the wrong way to show what happens if the holes don't line up. Love it!

[@robertsomerville5377]

They assembled incorrectly . Start all bolts before tightening .

[@lohikarhu734]

@@robertsomerville5377 funny, something that one would normally do, but they did not? OTOH, with countersunk screw heads, you could end up generating significant distortion forces on a part of the clearance holes allow more tolerance during assembly. Tricky stuff. Thx for comment.

[@georgescott6967]

I watched your fits and tolerances video before this one. The narration on this one is _much_ better; I understood everything being said. Great job, thank you.

[@PPAATTful]

I'm a manufacturing engineer for the last 40 years, absolutely loved your show very well done. One thing it's not called a ruler it's called a scale, I'll buy one.

[@jamesmanoni]

I'm a draftsman and I learnt so much useful information I never knew before from this video, consider me subscribed!

[@milaanpatel4997]

I accidentally came on to this video. This is kind of information I was looking for since years.

[@jmannUSMC]

Kinda bummed I just now found this channel. Thank you for creating such great content that really tickles the brain. Hope the team is well and we get some new videos in the future!

[@AlphaSierra375]

This was exceptional! I no longer can look at the most experience engineers like they're infalible. It almost broke my brain and heart at the point where you mentioned & demonstrated with CMM how a hole (& shaft) can never be perfect. Maybe that is what draws me to the world of CAD. A hypothetical realm of perfect dimensions.

[@sarvjotsingh]

You guys are awesome. You explained these GD&T principles so much better than my book. Bravo 👏

[@reyyannajeeb1067]

As a mech E, these videos are always fun to watch. Thank you for making them

[@humbermg]

This is amazing! Detailed, to the point and a great reference for anyone learning the basics. I love it! Congratulations!

[@bluescrat]

Love your video and audio quality, up close camera shots and thorough detailed explanations. Thank you!!

[@rahulbindhu]

Please never stop making these videos.

[@JeffandJake]

Excellent presentation with great real-life examples. Thanks for sharing this for free.

[@austindiodene972]

This is probably the best put together video on manufacturing information I've ever seen. Definitely subbed

[@brettcoles6462]

You're back! I thought you weren't going to post anymore and I was very disappointed. Your videos have been more helpful than my manufacturing class in undergrad!

[@greybeard9x44]

A very good video. Thanks. I have used all these methods. Setting telescopic gauges as Go and Nogo gauges using a micrometer and then trying them in the work can be helpful. There are also wedge gauges which in some situations, e.g. measuring slightly worn or rough holes before making a new part to fit the hole, can give useful and repeatable results. As these are used directly with a micrometer, they are quick to use too. Getting a feel for the kit you are using really is important, so lots of test runs, and comparison of results from different equipment being used, do build up confidence and opinions of what's best.

[@wallinkevin]

Machinist here. Great videos! Really looking forward to your GD&T videos! Subscribed!

[@Trashbag-Sounds]

The! best channel on youtube right now. Just amazing! Thank you sooo so so much

[@kylechrystal4532]

Excellent video. Regarding the telescoping bore gauge - you can lightly tighten the thumb screw with the handle at an angle in the hole and the piston over extended, then by rocking the tool over past center (like the dial bore gauge motion) the hole wall will push the piston in and it will stay there, at the proper size.

[@CN-cv7kq]

Seriously these videos are amazing. Helps me out so much. The terminology you use makes it easy to understand and explain to other people. I just wish you had more videos to watch. I just found this channel and watched everything you had. Thank you for taking the time to make these. By the way I subscribed within 1 minute of the first video I watched.

[@Saki630]

this one video has more information than all the 'trending bullshit' for the past 10 years on KZbin. This answers many questions, but then leaves more to be answered like how to fit things into the bores/holes and makes sure everything is in the right position.

[@JinKee]

Check out their older video on "tolerances: how to make parts that fit together"

[@PocketConcepts_]

This channel is such a gem. Easiest subscription I've ever made.

[@spcp001]

Great Video! One more trick for measureing tight tolerance holes is to check your workpiece temperature before you measure it, especially on larger bore and people are trying to hit lower tolerance boundaries. I've seen numerous housing sent back to the machine shop because they are slightly too tight. And it turns out the machining shop just is cooking hot.

[@sergiourquijo4000]

This channel is just awesome. I haven`t studied any of this but it is really interesting to get a sneak peak of what it is all about.

[@davidewing9088]

EXCELLENT Information and presentation of this material. Thank you.

[@3073Sean]

Deep dive into GDT please!! You guys are awesome educators, keep it coming!

[@ethanmye-rs]

Thank you! Would love more videos about GD&T

[@jacobwild278]

Please do more like this! So good! Start a patreon, so many people will support!

[@100x35.Design]

I LOVE YOUR VIDEOS AND I LIKE HOW EXPLANATORY THEY ARE. PLEASE DO MORE VIDEOS! PLEASE!!!

[@maplesyrup2944]

Great figures and animations. Glad to see you actually machined some pieces to demonstrate.

[@aiztinik]

Nice, after so many time, I was waiting for another one of your very pleasent with that Golf commentator voice videos.

[@akshayachavan8787]

This is the channel I was searching.. u guys are really brilliant.. thank you so much for information ☺

[@HerrJordel]

I love this channel. It has some of the best quality videos and educational content

[@alfredogutierrez806]

This channel has some of the best explanatory videos I've ever seen. Great work. I hope that you post more frequently. Keep the awesome work you're doing.

[@tkshoe4u]

Great stuff. Consolidated a ton of stuff that took years to pick up as a practicing engineer.

[@helicopterdriver]

Roller Burnishing. Perfect fit, slick finish and perfectly round. No reaming. Very repeatable even with interpolated bores in steel. Micron tolerances. Did that 25 years ago.

[@lohikarhu734]

Thanks for the comment on this...Have you seen any videos, or web discussions on this subject? I wondered, too, of roller burnishing would also give any advantages in grain formation, or surface "integrity"?

[@helicopterdriver]

@@lohikarhu734 The fit of the bore is very repeatable. The surface finish usually looks like chrome finish on steel or aluminum. Roundness is very good as well. Can't beat it on a production setup. I made parts for tobacco harvesters and the tolerances were very tight. Saved a lot of time.

[@PacoOtis]

Excellently presented and very informative! Thanks for sharing and the best of luck!

[@David_Hoskins]

Knocked it out of the park as always!! Nice and clear descriptions of high-level concepts, along with good video clips showing practical applications of the discussed topics!

[@steveh8724]

Watching this for a second time. Really top notch in all respects: excellent videography, high-quality audio, and most important great technical content. I also like the two voices used for narration!

[@HopelessCT]

I am very glad you guys still upload, such good quality ya’ll deserve so much support

[@Urbankin]

Absolutely superb to see your content! Graduated as mechanical engineer recently and making the nose dive into real world jungle of tolerances and applications. University scratched the surface on the topic and no way any of the students actually grasped the subject beyond go-nogo inspection. Engineering field is so vast that it's kinda pointless to demand good knowledge on machining tolerances as there are so many career options and industries that work with different tolerances. I have worked mostly on construction steel and lately on heavy duty processing machines. I'm all about R&D and ditching unnecessary tolerances is one way to produce more cost effective product and increase volume potential. Slab on some ISO 14000 into the design phase makes brains go "pop". Now I need to think is there alternative way to produce same part but with lower energy consumption and material waste. :D Ahh.. Engineering, what a lovely job.

[@Urbankin]

side note: Why name Tarkka? As Finnish person, that peaked curiosity. Most likely this question will be asked repeatedly over time, so might want to consider adding it to About section :D

[@gaffney92]

Wow! Extremely insightful and concise!

[@ka9dgx]

That was really informative, thanks! Glad to see you've got a decimal inch scale on your ruler in your shop, you've avoided my pet peeve. 8)

[@Cheticus]

Been hoping for a new video for awhile! Without exception, they continue to be exceptional. Hope you're doing well :). Thank you!!!

[@Alorand]

The KZbin algorithm has recomended me a 'Boring' video, but I didn't mind...

[@rockzbassist]

Hi, I really love your series of mechanical engineering basics! If you don't mind, please make videos about bearings (journal bearing included!) Thank you.

[@vishnooramdin2915]

Enjoyed your vidio from Canada.Miss working for the DANA corporation making disc brake Rotors as a CNC machine operator on a CNC turning center lathe and drilling machines Wish I had your vidio while being employed.Now retired(lol)

[@asheshshrestha]

Really glad to see you guys after a long time

[@JoshuaJones-te1ef]

Shame you guys don't do videos anymore. These are great.

[@ILIKECHEESECAKE100]

Always glad to see more from this channel! Really quality work

[@khanabdulrehman3913]

I am an engineer and I love your videos

[@mandy2tomtube]

I really like the way you've done this video it's perfect you should do more!

[@CNCMachinistEducationNetwork]

excellent video - such a basic thing but how to explain why is great

[@Maeili]

Thanks for the very helpful and well explained video! Metric conversions also much appreciated.

[@lohikarhu734]

Just went over to your website... Kiva juttu! Now, I need to spend some hours looking at previous videos ;-)

[@ImolaS3]

Hoping to see more content coming our way soon

[@sashab5656]

You know what, I never leave comments. However I am compelled to leave you guys one: Great job, I've subscribed and please keep these vids coming.

[@MrChrisCanna]

Your videos are excellent and so informative! I think a lot of engineers lack an understanding of these kinds of principles which ends up causing machinists a lot of headaches. I'm working towards building my understanding and these videos are super interesting. I just wish you guys posted more often! Two years since your last upload :( subscribed though!

[@Wyllie38]

Stumbled across your channel. Easily earned my subscription. Great stuff. Even if I am an ISO guy

[@reyspec]

Nice Quality content you show us! My student should watch this!

[@MrKadvaga]

This is a funny title. You guys should keep making videos!

[@ttiization]

Those videos rock. Lovely and accurate content.

[@nickp4793]

Great content and no fluff! Thanks for making it.

[@sky173]

Where have you been? Glad to see more content from you. I hope to see more soon.

[@JustInTime0525]

Just when I found out and sub to your channel today, and thinking I found you too late cause your last video was one year ago... New upload :D, thank you!

[@drivenba]

Damn I just found this and the channel's dead - please come back! this content is invaluable

[@USER-q8y7k]

Very informative video, if design engineers follow it, this will save a lot time and money. Still to reach such accurate precision you mentioned, a computerized system will be needed in every step of design and production which may cost a lot of money, furthermore , many design engineers do not have these knowledge and experience.

[@ayushmahato4481]

Amazing content with an all round scope

[@lohikarhu734]

I'm not sure how I came across this video, but it was certainly "a good use of time" :-) And, hey, Metric AND ISO discussion ;-) !

[@brucewilliams6292]

I love learning so much about machining. This is a great video.

[@lamtran2993]

Wish to see more from you guys.

[@YavorDimitroff]

Great video, thank you! Your content is amazing! Top channel for mechanical engineers. Just curious, do you plan to have a video on using GPS (Geometric Product Specification) on drawings? Like more info on basic dimensions and position tolerance with datum systems, material modifiers MMC / LMC, operators for linear size tolerance GG, GN, GX, etc. Like practical examples would be great. Thanks! Keep up the good work!

[@filmweaver2013]

Why has the channel stopped posting videos? Great content, very unique! Looking forward for your content

[@mohamedmohsen7730]

I am an engineering student . I want to think you and all the team , and i hope there will be more vedios in the future

[@superpilun]

Excellent videos! I always learn something new.

[@legrandex]

Thank you for providing reasons for tolerances and fit. It upsets me that the justifications for tolerances in my machining classes are never mentioned.

[@keine031]

Beautiful English pronunciation and diction.

[@mardrom1]

Yes very clean AMERICAN pronunciation. I was impressed with this also.

[@GaryH-pw9cm]

@@mardrom1 And no music. Just information.

[@TMoney1341]

Good video, the only part I disagree with is the accuracy of telescoping guages they aren't accurate to thousandths but tenths with enough experience and appropriate technique using them.

[@grant-is]

I really would love to see more :)

[@SuperAWaC]

I am a machinist and while this video is full of very good content a lot of the information here is a good 10+ years out of date, and there are a lot of places where they say/imply something is the best for a given scenario when it is not strictly the case

[@OriginalJetForMe]

This video was great! I really learned a lot. Thank you!

[@AshLeeeeee]

This is amazing! Thank the youtube gods you showed up so I could sub and watch more content

[@e2jw]

Great Job with this! Thanks for sharing it!

[@UraniumEagle]

Are y'all still planning to release the video on GD&T Position tolerance? These videos are exceptionally clear!

[@larrybud]

Why are the flutes on a drill bit sharpened if they are only used for chip extraction?

[@kayrunjaavice1421]

I believe it's because otherwise chips would become wedged between the hole wall and the outer flute.

[@nabeelk]

Thank you very much guys!, Please keep posting!

[@What-is-thehandle]

People who thumbs down these videos probably can't even read a tape measure.

[@youcandoit786]

Awesome work, please keep that coming