Fits and Tolerances, Oh My!

This episode on Blondihacks, let's talk about how to make things fit together! Exclusive videos, drawings, models & plans available on Patreon!
/ quinndunki
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[@jimsvideos7201]

Well Quinn you might be an odd duck, but you quack me up just the same :-)

[@Blondihacks]

You want a bird pun thread? Because this is how you get a bird pun thread. Pinned.

[@jimsvideos7201]

@@Blondihacks That's the thing about bird jokes, they happen feather or not you want them to.

[@exorbis9880]

There seems to be an absence of a certain ornithological piece. A head line regarding the mass awareness of a certain avian variety.

[@jimsvideos7201]

@@Blondihacks I hope I don't get pigeon-holed here; I will gladly make puns about other things too.

[@brianrhubbard]

Every time I try to make a precision fit, things seem to fly south.

[@ThisOldTony]

you went there!... and good show!

[@Blondihacks]

But did I go there... enough?

[@gingertimelord5]

Two favorite KZbinrs in one comment ......soooo ....video collab?

[@oldfarthacks]

@@Blondihacks Is enough ever enough, or is more always better?

[@joshuacollins385]

The trick to hitting exactly that 3.3mm diameter is to have callipers that only measure to one decimal place.

[@Blondihacks]

😂

[@nicholashacking381]

I tried climbing the Hill of Precision but I fell into the Valley of Despair. However, I found sanctuary in the Garden of Aw, It'll Do.

[@michaeljohnson-li5nn]

When I first started my apprenticeship with Rolls-Royce I was using a tolerance and fit chart to ISO 286 to help me design a simple location fixture. When one of the ‘older’ engineers saw me doing this he promptly directed me to the official RR chart that indicated tolerances and fits as used by Royce’s As I was only seventeen at the time and young and innocent I asked him why I could not use the ISO data. His answer still resonates with me today, he replied to me in a very strong tone of voice “because we are Rolls-Royce son, that’s why”. Even after all these years I still keep a copy of this data in my desk drawer!

[@34k5]

I think I speak for many others when I ask: How can we see that Rolls Royce data? Would be very interesting to see.

[@michaeljohnson-li5nn]

@John Verne yes, gas turbine engines - Based in Derby U.K.

[@petem6291]

I saw a sign one time that said Rolls Royce's Never Break Down , they only fail to precede forward . ( the photo of the sign was in a dealership in India ) Pete M

[@TorteTS]

@@petem6291 They got it.

[@wayneacaron8744]

that must have been BEFORE rr wore a 10 yo chrysler body!!

[@alunjones2550]

The tolerance of an interference fit is inversely proportional to the size of hammer needed to make the two parts fit 😀

[@davewilliams6172]

Have you seen my range of hammers....very impressive lol

[@alakani]

@@davewilliams6172 Too much stuff, just drop an old engine block from the correct height

[@oldfarthacks]

So when the 6 ton press is not enough, then you need the 20 ton press?

[@basher20]

Waaaaay back in engineering school, I had a professor who started a discussion of geometric dimensioning and tolerances with the story of Plato's Machine shop, where all parts are built exactly to nominal dimension. The only problem is that everything they produce is infinately costly and takes an infinite amount of time to deliver. I also had a riflery instructor make the point that until you can out shoot your gun, that is reliably make groups at or below the rated capability of your equipment, spending a lot of money on fancier gear isn't going to improve your scores.

[@oldfarthacks]

So true, until you are better than your equipment, the equipment will limit you. After that, well you are just stuck for it.

[@billy19461]

Don’t know about anyone else but I learned a lot.

[@unclebobsbees4899]

Agreed!

[@mikecurtin9831]

@@BruceLortzHI Me too. It's uncomfortable, but you learn stuff so it's only uncomfortable once. (Hopefully.)

[@DavidLindes]

@@BruceLortzHI Congratulations! You're now climbing the hill of knowledge (where more knowledge leads to less certainty). :)

[@soranuareane]

"Be comfortable with a tolerance that would *just* make a woodworker cry." You've earned a new subscriber.

[@Blondihacks]

😬 Thanks for the sub!

[@RonCovell]

Quinn - thanks for a superbly detailed video, which you made both fun and understandable.

[@5tr41ghtGuy]

Quinn did a great job connecting the practical implications of each type of fit to the specification. This is super important if you are designing your own parts and mechanisms. Bravo!

[@VastCNC]

Love the Renzetti shout out! He's the godfather of precision.

[@mpetersen6]

No. One of the godfathers and Gods of precision is Wayne D Moore. Along with Henry Maudsley

[@OtaZun]

I will definitely use this with my university students. Subscribed!

[@Roblecop]

These are things as a designer I have to keep in mind when designing things. Some of the work I do is incredibly expensive and requires an incredible amount of precision. Unlike my last employer which was in the ag equipment industry, to where the guys would tell me "If I can't read it on a tape measure I don't want to see your print." So designing mildy complex machines to have plus minus 1/16" fits and still working was quite challenging.

[@Baldorcete]

A nice thing about ISO is that you usually design with the same tolerance for all holes (H7 is typical), and varies the shaft tolerance according to your needs. This allows you to use only one set of tools for drilling. For most of general purpose machining, you only need a set of H7 drills and reamers. (And the undersized drills for use before reamers). Since shafts are usually machined in a lathe or purchased as needed, you don't need any special tools to hit whatever tolerance.

[@LCOOTS]

Odd duck, you are the best teacher for anything machinist related! you cover all the problems and have a very respectable way of making mistakes and how to correct them, thanks i follow your channel, looking for the new videos all the time, thank you L.C.

[@pravado81]

That look when you point to the coffee mug just cracks me up every time. Oh I learned a lot too.

[@theelectricmonk3909]

"Nominal is a synonym for fictional" 🤣🤣🤣 - that is SO true!

[@oldfarthacks]

True, when you breath on a block of metal it deforms slightly. Turn it sideways and the effects of gravity changes it's shape. I myself think of everything, but metal in especial, as rubber.

[@mariellecb1]

A fabulous mini-treatise! But I will admit to crying a time or two when machining. Maybe not crying. Feeling glum. But then brightening when the second one turns out so much better than the first. 😁

[@jimmunger8658]

We’re all odd ducks the key is to find birds of a feather to waddle with. Enjoyed your teaching and insight once again. Thank you

[@hollo9571]

Just came here from your most recent boiler video. My favourite Blondihacks video yet - full of stuff I didn't know that I needed to know.

[@Mojoptix]

Really captivating stuff ! Before even attempting to climb that 'hill of precision', I might start off by wandering a bit into the Dunning-Kruger 'Valley of Despair' first...

[@oliphab7468]

oh man it's you! the digital sundial is still one of my favorite 3D Prints to show off!

[@Mojoptix]

@@oliphab7468 Glad you still like it :) I have been planning to machine/CNC a digital sundial for a while now. But the more I learn about machining, the more I feel I still need to learn some more...

[@nicolaspillot5789]

This is a superb video, clear, concise although complete, i never watched anything clearer about tolerances ! Wonderful 18 minute learning session, thanks a bunch !!

[@Suinsap]

Quinn, TOT and Abom, the best in any order

[@zackeudy6236]

C'mon, AvE ain't a bad guy.

[@Suinsap]

myfordboy , Uri Tuchman and Clickspring are also great

[@Blondihacks]

Very high company, thank you!

[@Suinsap]

Well, you totally deserve it, you are inspiring. In fact I am planning to aquire a hobbyist machining kit some day. I also like Irish music 👍🏽

[@OthamJohn]

Beautifully presented. Clear and concise, thank you

[@danielabbey7726]

Very thorough coverage of tolerances and fits. Another great video, Quinn!

[@billbrennan8405]

Quinn nice job covering a complex subject. Another point that enters in is the circular form of the ID to OD components being roundness / runout or degree of eccentricity variation from the center axis. Just clamping a part in a three jaw chuck can produce a trilobed geometry or shape. Drill press can also create this condition . This aspect becomes important as fits get closer and is often controlled by Geometric tolerancing on modern part prints. . .

[@kennoldfield5890]

Quinn, as a woodworker, hobby steam engine enthusiast, wannabe machinist, I find your videos just my cup of tea. And you sense on humour is the icing on the cake. Your delivery is spot on. I find that I watch through your vids even though they are longer than my typical TLDR. Thank you for your effort. I have subscribed and will follow you with interest

[@Blondihacks]

Thank for the sub, and for the kind words!

[@oldfarthacks]

@@Blondihacks Quinn, you have earned the kind words. You make a great teacher and I do love that you are willing to show the reasons behind the Imperial and Metric crying spells. Still love that one shot of you just planting your head on the face of the mill spindle after a boo boo.

[@peterridgway7355]

Great, thanks for a demonstrating practical approach to tolerance machining. Very helpful.

[@Kucklehead223]

Very well presented, Quinn. This one's a keeper :)

[@moorejl57]

This video showed great tolerance and was fitting to it's audience.

[@davfew]

Thanks Quinn - I learn something new from every video you post.

[@charlesmoore4591]

Love how u explain things, thanks alot.

[@augurelite]

THIS WAS SO INCREDIBLY HELPFUL THANK YOU

[@geoffreynewton5839]

Perfection is a journey, not a destination!

[@johnreese3943]

Quinn, Thank you for a very informative video. I am in my 80s and an experienced machinist. Even so I learned alot from this video. You might want to mention in a future video that reaming can be unpredictable. The diameter will vary with rpm, feed rate, coolant (or cutting oi), and probably what you had for breakfast.

[@oldfarthacks]

As to reaming being unpredictable, don't forget the phase of the moon, which way the wind is blowing, the temperature of the shop and so much more. You even have to factor in the number of ducks flying by at the time.

[@johnreese3943]

@@oldfarthacks Yes, and we have named only a few of the variables that affect the size you will actually get.

[@kramerdesign9443]

I’ve always wondered how this worked! Fantastic video!

[@phillipmetcalf9404]

Wow well done. I love how you explained a complicated subject and one very often miss understood, so well. My engineering hat is off for you.

[@johngayder9249]

Fantastic video, thank you for bringing clarity to this subject! I look forward to seeing more on the subject!

[@TheAcousticWarfare]

Excellent video, extremely well explained and demonstrated! Thanks!

[@DudleyToolwright]

Wonderfully explained and demonstrated, as always.

[@mymotorbikeobsessions]

Your hill of precision appeals to me. I can see it useful when setting up my first shop and choosing my initial machine purchases. Thanks!

[@jevans4379]

We all benefit from your knowledge and great teaching style. thank you.

[@rogerrascal8632]

Great work thanks Quinn!

[@howardosborne8647]

All very nicely presented and clearly explained. 👍

[@InfiniteCraftsman]

Interesting, something I don’t need to know today but I’m glad I know what to look up in the future. Very well done. Thanks!!!

[@GrummanPilots]

Thank you for this video, I've been trying to find an elegant way to explain interference fits (to pilots) and yours is the best!

[@jimsvideos7201]

A loose fit is a touch and go, a running fit is a decent landing and an interfence fit is one of those landings after which you need full power to taxi. 😂

[@HanstheTraffer]

Wow, Thanks Quinn. I will be watching this one more than once. So much stuff I didn't know.

[@Argosh]

"If you go for that perfect every time you're never gonna finish anything." Ever heard of clickspring? 🤪

[@DavidLindes]

And when was the last time we got a Clickspring video? ;)

[@DavidLindes]

(I know, I know... the paper and all that. But that just makes the point!)

[@emrfixit]

Thank you!

[@mikemarriam]

Thanks for the great tutorial.

[@GoCreateHobbyMachineShop]

Great tutorial! Thanks for the shout out.

[@IMSAIGuy]

Thanks

[@Tribalwerewolf]

As always love your videos. Be safe out there

[@timort2260]

Great video I might of randomly stubble myself to your channel but I'm very glad I did. As a wood working I've been really getting interested in more metal work as of lately. Thanks for the information!

[@G2Gltd]

This was exactly the video I needed.

[@rodbennett4790]

G'day Quinn. Excellent, excellent, excellent! The hill of precision - what an excellent way to explain the topic. By an excellent teacher! You have a special skill so keep it up.

[@MikeBramm]

Great video. Covers a topic a lot of people don't really spend much time on.

[@jamesfrancis303]

Incredibly useful, I learned a lot thank you

[@u2ooberboober]

Awesome info and video!

[@sabatoleo29]

Queen, your love for sharing your knowledge puts You in a class of your own, thanks for making aspiring machinists understand what lots of master machinist, before You , did not teach to their apprentices, and toke their knowledge in the grave,!!

[@ErikBongers]

For the metric part of the world, just convert the Robin scale of skill to the Stefan scale.

[@fantasmag00ria]

nah, for metric see kzbin.info/www/bejne/rae5fqZod7-Xm7c

[@potatopobobot4231]

who replaces sprocket on the low end? ave?

[@ErikBongers]

@@potatopobobot4231 Diresta. Because his Mantra is "If it looks straight, it is straight."

[@swamihuman9395]

Thx. Well presented. "There's no crying in machining!" HA!:)

[@adrianharrison5208]

ok going to have to watch that one again as I never knew this stuff before so its really good too get my head around it.. Thanks Quinn for another really good video :)

[@minimumexpectationsdiy6013]

Excellent! Thank you.

[@davidmcduffie1398]

Great job on the brief version !

[@oliphab7468]

Learned a lot, thanks!

[@kurtrudolph5723]

Awesome video!!!!!!!!!!!!!

[@TheFishingHobby]

Wow, that was great! Thank you, I learned a lot!

[@addisongardner1989]

Great job, doll, as always!

[@Hippo0529]

Great vid, explained better than a book

[@cdnbluesdriver]

Wow this video came up on my KZbin recommendations at a great time- trying to design a shaft basis mechanism on ANSI rules. Thanks Quinn!!

[@kimber1958]

Very informative ,very well done. Thanks

[@karoma7898]

I love the jab on wood workers 😂

[@gringoanon4550]

When making aircraft parts, sometimes it was necessary to put the part under your arm when taking it to the checking desk, it made the part swell up by two tenths, you also had to watch it if the machine shop was a bit on the cold side. Hopefully, that part ended up in someplace hot.

[@douglasrife]

About the best overview of ‘fits & clearances’ that I’ve seen. I’m subscribing!

[@Blondihacks]

Thanks for the sub! 😁

[@mxcollin95]

Great video! 👏

[@Jajaho2]

Nice, informative and well explained lesson. Thank you.

[@RipRobinson]

Very goof info! Thanks!

[@thedirtyknobs]

Another excellent video

[@toolbox-gua]

For me was a superb video and learning. You are far from offensive, in my tolerance scale, and your sense of humor is what makes me like your content more than others. But your level of respect to everyone is exemplary. Wish you well, thank you.

[@GeoffTV2]

I understand that a machinist typically works to the nearest thou, a woodworker works to the nearest 1/8" and a shipwright works to the nearest ship.

[@Canalcoholic]

Sorry, but I’m going to take exception to that one, 1/8” is said to be the difference between a carpenter and a woodworker.

[@GeoffTV2]

@@Canalcoholic Fair comment. My bad.

[@Canalcoholic]

@@GeoffTV2 Even so, as a machinist (on my late father’s Imperial lathe) I can work to a thou., as a hand tool woodworker I am happy if my dovetails are within a quarter of a mm.

[@GeoffTV2]

@@Canalcoholic That's nice going on the woodwork. I can't imagine what my dovetails would be like. I think an eighth of an inch would be optimistic :-)

[@DRrandomman22]

can i get a amen, the explanation about skill and machines is amazing and so true. nobody thinks its amazing to hold .0001 or even .00005 on an brand new million dollar machine, it cost a million bucks it better hold that tolerance. holding .0001 on a 800 dollar hobby lathe or mill is impressive. its more about the person behind the machine then the machine is the truth.

[@Tommy_Mac]

A talented machinist, electrician or other craft person can get away with less-than-great equipment. This is why I need the best tools I can get my hands on!

[@oldfarthacks]

There is an old story about this young man, the only gun that he could afford to get the game that he needed to feed the kids was a shotgun that would fall apart after every shot. Because the gun was so bad, he learned to be a very good shot. This, as Quinn points out, makes you better quicker.

[@JimWhitaker]

As usual with your videos, I'm better informed and amused. Thank you.

[@davfew]

I never knew undersized reamers were a thing - had never heard of them before. Thanks

[@TheKnacklersWorkshop]

Hi Quinn, Interesting video… 100% agree on the great tool that Nigel (Go Create Hobby Shop) has made… Take care Paul,,

[@phildcrow]

This was awesome. Thanks! I had no idea that there were codes for tolerances. I thought they were just called out by number.

[@chrismorris8695]

Great practical explanation of fits. In engineering school they teach us how to calculate for stresses and stains but never a practical breakdown like this.

[@navaho5430]

I like the pop when you pull the pin out.

[@100yojimbo]

Very well explained in very easy to understand terms well done

[@SeanBZA]

Found that a very important thing is an adjustable reamer, especially for bushings in shafts, and especially for those times you are replacing a worn bushing, and press the new one in. you need to have the new bush slightly oversize for the hole, to get a good press fit, and I made them 0.5mm undersize on the inside, to allow me to ream them out to fit the existing shaft, as that was slightly worn, but making or getting a new one was not possible time wise. Used some Vesconite hilube, as that would self lubricate, instead of the white nylon bushings the OEM used, and ran dry. Then used a piece of the rod to make an insert tool for them as well, 1mm undersize all dimensions, and gently tapped the bushes into place. Took around an hour to get out to the clearance fit, as you really only get a single chance before it is the same as before. 2 sets of both bushes on that shaft, one still as spare, and they will outlast the original. Could do little about shaft wear or it being slightly bent, other than to lightly polish it and apply a little correction to the bend, plus remove the original burrs on all edges. It is true about Chinese equipment, it arrives as an assembled kit, so you do not need a manual to assemble it, but you still need to take it apart and fix it up to workable from new. However, as the price was one hundredth the cost of the equivalent US manufacturers ( which is ironically made all in India and Vietnam now, nothing aside from the price of parts is US any more) machine, and it is a faster and more capable machine as well, it was well worth the hassle. Most spares are also easy to fabricate, or at least use the part to make oversize fit parts for, and only a few specialised parts you need from the OEM. Just only gripe is why the hell did they have to use 36VAC for all internal electrical works, because that is a pain to get spares, so I was doing a lot of repairs and converting parts to 24VAC, which was thankfully also available inside, but unused.

[@aquilifergroup]

Wow, thank you.

[@ChristopherTate]

"There's no crying in machining!" False.

[@jimscheltens2647]

Very nice job on the graphics!

[@ArtOfGottiKa]

Sehr gut erklärt, dankeschön.

[@sabah.shabdar8800]

I’m very happy to find this channel and subscribed

[@Blondihacks]

Thanks for the sub! 😀

[@hdheuejhzbsnnaj]

Excellent video👌

[@peterpocock9062]

Nice treatise on the subject. I use the iso system but now I'm curious about the ansi system! Oh, by the way, nothing wrong about liking trains. I love em too.😎

[@ogenmatic]

Well demonstrated & explained plus entertaining. Nicely done! New sub from an old machinist.