WHAT ARE SHRINK RULES Short #16 tubalcain patternmakers

[@kensherwin4544]

Your "short" videos are the perfect length and are in fact short as compared to your equally useful 45 minute "long" videos. When you make them, we'll watch them and thoroughly enjoy them. unlike those silly 1-minute farces these days. Thank you.

[@mrpete222]

Thank you. Yes, I do not understand those one minute videos.

[@jerrydemas2020]

@@mrpete222 That's because the 1 minute videos are of a hot girl dancing or making a funny face--which you are not! But I have seen you make a funny face time to time.

[@carlosgaspar8447]

The 1 minute videos are meant to keep subcribers engaged and the youtube algorithm also likes regular content.

[@slypig24]

The joke about George Costanza was vert funny. And the double shrinkage for multiply batch casting was very interesting. Where i did my machinist (Fitter & Turner) apprenticeship, we still had a small pattern shop, as we still cast in house in out foundry, they still had the, then disused overhead shaft belt drive, sitting above. Cheers from Australia

[@Stillpoint23]

Now that you mention it, the elegant curves of the calipers are pretty much a perfect representation of thr elegant curves of my better half!

[@mrpete222]

So very true. Some of the calipers are almost voluptuous.

[@charlesbradshaw8673]

Mr Pete, never cast anything, don't expect to ever cast anything, but as my mother (a school teacher for 50 plus years) always told us if you didn't learn anything today, you must of slept all day. Well, I have learned something today, so mom would be proud of both of us. You for teaching something and me for learning something. By the way I almost always learn something from watching one of your lessons. Thanks again, Charlie

[@robertpearson8798]

Interesting that this video came out today. Just yesterday I was showing my young trainee the shrink rules we have in the cabinet in the shop that are left over from the old pattern maker that trained me. I explained their purpose and cautioned him not to confuse them with ordinary ones. He has to listen to me because I’m the ruler of the rules and my rulings are final. Some other little treasures are the ball ended burnishers (not sure of the correct term) that were used for fillets.

[@mrpete222]

👍👍👍

[@Finke.]

Robert Pearson Did you also explain to him "the rule of thumb" ...

[@roscoepatternworks3471]

The ball end burnished are called fillet irons. The ordinary rules are called common rules. As a side note the difference between a ruler and a rule. With a ruler the graduations do not go to the end. Like a drafters ruler, and sometimes called a scale. A rule starts and ends with the length of the rule, in. A 12" rule is just 12" long.

[@robertpearson8798]

@@Finke. Yes, thumbtimes you win and thumbtimes you lose.

[@Finke.]

@@robertpearson8798 😄 Aaah ... but did you know ... Rule of thumb measures one inch as the distance from the craft persons knuckle to the tip of their thumb ... This is part of an old English system of measurements based on the body that included the yard (which is the distance from the nose to the tip of the index finger) and the foot.

[@dougiehogarth6652]

A practical joke in the Scottish foundries in the 60s was for the greenhorn apprentice to be sent to boil his rule (wood) in linseed oil to make it grow.. I suppose practical jokes on apprentices are banned nowadays but I don't think it did much harm

[@mrpete222]

lol

[@filmbluff99]

Or send the apprentice to the store-man for a box of half inch holes !

[@kitmaira]

I absolutely agree with you on the shorts, especially the under one minute ones. Useless. I assume it is about algorithms, but I think that it is more for KZbin’s benefit than the creators or the viewers. There is lots of good information in your “shorts,” and I hope you continue to share this information for many years to come.

[@Rick_Bagnall]

Thank you for these videos, I find them entertaining and useful. I understand the concept of double shrink. I work in a foundry that does investment casting. When we make our injection molds they have to include 2 shrink factors, one for the wax pattern and the other for the metal. For example, the wax has a shrink rate of .006" per inch and the aluminum has a shrink rate of .006" per inch also so that when we calculate the shrink to build the wax pattern mold it has to have a shrink of .012" per inch (.006"for the wax pattern shrink + .006"for the aluminum shrink) in order for the metal part to come out right. Thanks again!

[@mrpete222]

Very interesting

[@bc65925]

I am with you on the "Shorts". I think it is the tubes way of getting more video's so they can squeeze in more adds. I don't watch most of them.

[@TestSpaceMonkey]

Was going to comment the same. Shorts are just the latest tactic to keep you in one spot long enough to serve more seconds of ads. The more constant the distraction, the less you're making your own decisions about what you're doing. What's sad is they are just doing it because other popular companies have short-video-based services that suck people in just the same. It's a race to the bottom.

[@coreylamartiniere1428]

I can honestly say I've never been interested in foundry work or pattern making but I enjoy your videos because I always seem to learn something that helps in other aspects of my work/hobby even if it's unrelated to the subject of the video. Thank you for your content and dedication to teaching

[@mrpete222]

👍

[@danbreyfogle8486]

Mr. Pete's channel, short or long, always my first stop in an evening if there is a new video. As to ruler vs rule, as a young man I attended a trade school to learn drafting. In those classes we were chastised for call them rulers, they were "scales" and never anything but that. But as I often say, "call me anything but late to lunch," and I think you can call them a ruler, rule, scale, or whatever and I won't correct you. As to shorts, I think it is intended for the younger set that can't make a commitment to watch anything more than a minute or two without getting bored. Keep doing what you do Mr. Pete, I watch them all.

[@mrpete222]

😀

[@SludgeFuZZ]

Used to have a small patternmaker shop next to a big ol' machine shop. The machinists didn't know what a shrink rule was and yes many f*ups were made in my absence. They always left the rule on the table saw for me to put back.

[@madjack3314]

My first machinist box and tools I bought from an old retired machinist when I started in the 80’s had several steel rules in it, which I still have today. So I gave my father a couple of them for his box at work, he was in machine tool repair in an equipment factory. He came to me a few weeks later and told me after things weren’t adding up that these were shrink rules. Come to find out the fellow i bought my tools from was a retired pattern maker. We got a laugh out of that and I an education on all is not always as it seems. Thanks for the videos sir.

[@mrpete222]

lol

[@markshort9098]

🤣🤣🤣 that would have been a very frustrating few weeks, I can imagine measuring and measuring and measuring again all while wondering what the hell is going wrong

[@madjack3314]

He was definitely scratching his head for a while@@markshort9098

[@G1951-w1y]

Back in 90's, our foundry used cast iron permanent molds for casting aluminum. Miller Pattern works provided our molds & I remember old Bob using these to make his patterns. The permanent molds were done in a sand casting with very little machining afterwards, but he had to contend with the cast iron shrinkage when cast, the expansion when in use, & the shrinkage of the aluminum casting once cooled. Talk about clear as mud. But I found all this fascinating.

[@windyhillfoundry5940]

If you have one of the patterns your father made we would enjoy seeing that as well. Thanks for the insight on shrink rules👍

[@JamesP_TheShedShop]

I like subjects presented by you. I prefer them to be complete and not rushed. As for these "shorts" some produce, I do not watch them and find them pointless. Keep up your way of teaching / video presenting, they work and are appreciated. .👍🏻

[@davesrepaircom]

Many Thanks for this video, Mr Pete., very interesting. And make your videos any length you want, we're watching and learning from you! I've learned more from you over the years than from all the machining books in my library put together! Like my wife, you 're a natural-born teacher and I really appreciate all you do to share your wealth of knowledge with us!

[@mrpete222]

Thank you very much

[@joecolanjr.8149]

Hey Mr.Pete...i do not watch those 1 minute shorts. Your videos are perfect just the way you do it!! Thanks and take care.

[@t1259sw]

Worked maintenance in a green sand foundry for 20 years, greatest job I've ever had. Great read at the end.

[@mrpete222]

👍

[@barryschneider6481]

Barry Schneider I went to Brooklyn Technical High School in the early 1960's. We had pattern making as well as a foundry. Our shrink rule had four scales on one ruler. THE FUN PART WAS STICKING WITH THE SAME SCALE FOR THE ENTIRE LAYOUT. WE V SHAPED OUT LAYOUT PENCILS, AND OUR TEACHER EXPECTED TO SEE HALF OF THE V MARK WHEN WE FINIHED THE PATTERN PIECE. THANKS FOR THE VIDEO.

[@mrpete222]

👍👍

[@jimmunger8658]

You’re foundry videos are some of my favorites. I’m a big fan of making your own castings and creating your own parts. Please keep them coming next spring. ( When it’s warmer out)

[@mrpete222]

Haven’t made a casting in well over a year. Can’t get anyone to watch the videos.

[@ChimeraActual]

Thanks! Many years ago when I was a boat builder and things got slow I would get work as a pattern maker. I loved it and it taught me precision which helped with the boat carpentry, and sometimes a boat carpentry trick would ease making a pattern. No CAD in the day so blueprints, rules, etc, If we wanted to duplicate a piece that we had an example of we would use calibrated thickness wax sheet to cover the original. Always seemed like a hack, but was usually sufficient. I still have my 20" State disk sander, a very useful patternmaker's tool. People today may think they are just sanders, but really they are meant to cut complex curves and lines on a pattern. I use mine to shape metal odds and ends in my hobby machine shop. Love your stuff Mr. Pete.

[@mrpete222]

Thank you. I had some of those sheets of wax for pattern makers. I never didn’t know exactly what they were for or how to use it. In fact, I think I threw it away I would love to have one of those big Sanders. They are amazing, and they cost thousands and thousands of dollars.

[@robertburns2415]

When conversing about shrink rules you must remember rules are rules and rulers are rulers one is the exception and not the rule. But when it comes to KZbin videos Mr Pete you rule.

[@jodydoakes8754]

Thanks Mr Pete. Hard as you have tried, I still barely understand casting, but getting better, thanks to you. I am thankful for the extra credit and always partake.

[@rogerkrey]

In 1965 I began my education to be a Industrial Arts Teacher @ Wilmington College in Ohio. One of the very first things the department head did was conduct a test to see if our perspiration caused surface rush on the machinery. To my surprise I was POSITIVE. The hand print I placed on the machine surface indeed turned to surface rust by class time the next day 🤔. From that point forward I needed to be very careful. Did you ever check for this acidic reaction with your students??

[@mrpete222]

No, I never heard of such a thing. But I find your story to be very interesting.

[@dalemcinnes1834]

I was friends with a fellow who was quite a hunter. He talked about that. I said I had never heard of that. He said some people can hold a gun and it will rust wherever they were holding it. He said both of his boys were that way. They were avid hunters also. Dale in Canada 🍁

[@mattmanyam]

Ever get in somebody else's vehicle, and notice the top of the steering wheel is noticeably worn? Don't let them handle your precision tools/guns/knives...

[@paulhunt598]

More information than I need to know, BUT I enjoy learning this information. I purchased a tooling cabinet that included tooling that I will never use. There is quite an assortment of "draft" mills. I thought that they were some sort of power tapered reamers. The seller had used or inherited them for making pattern draft. There is also an assortment of specialized production tooling for making tapered countersinks. They have incorporated micrometer type stop adjustments. Some have laid unattended and the adjustments are frozen. I should gift these to you for a short subject or what is it video. I didn't need the cabinet space, so this unneeded tooling has long sat unattended in my shop.

[@mrpete222]

Very interesting. I have never seen nor heard of those tools. I would be glad to accept these and use them in a video . my shipping address, if you are interested, is shown in my latest promotional video entitled. Christmas special Mrpete shop courses videos, atlas. Thank you for your consideration and offer.

[@RRINTHESHOP]

Great review of the rules of the shrink rulers, all of which you are the ruler of the rules.

[@llapmsp]

Great video Lyle. I find your foundry videos awesome.

[@garytaverner5930]

Thanks for your videos - any length - always interesting. It would be interesting to measure a dimension on a casting, for instance the table, with a regular rule and the pattern with a shrink rule to compare the 'dimensions'. Then we should see that the numbers are the same.

[@mrpete222]

Good idea I never thought of it

[@electrowizard2000]

This is a good example of a potential youtube Short. "Here’s a shrink ruler to measure something that shrunk." Then measure the plate casting and the pattern with the right rule. That said you don't need to change your content. Thanks as always for the education and a good story :)

[@charlescartwright6367]

Mahalo for the video Mr. Pete, I have never done any casting, but have made patterns for other folks (a long time ago). I didn't have a shrink rule so I did a quick scale from a chart and then refined it with Kentucky Windage for the machining factor. I agree with you on the "shorts" they are too short to be of any value and I refuse to waste my time with them, was that a rant???? Aloha

[@davidcockerman266]

When I first started doing machine work, I did make a few castings and had to purchase a shrink 3/16" rule. Still have it in my home shop toolbox. Still in the paper sleeve. Thanks for sharing.

[@4SafetyTraining]

I like your shorts the way you do them.

[@strongandco]

The "Short" videos are often used to pique the viewers curiosity with a little taster of a subject and make the viewer want to click on the channel link and find out more. You Tube has said to some of the bigger creators that it's the shorts that they are going to be promoting so presumably they have figured that they keep more viewers glued to the screen for longer. I've found a number of smaller channels that I otherwise would have missed by flicking though shorts.

[@ellieprice363]

Shorts are a form of “click bait” They pull you in and get you all frustrated if you’re not careful.

[@matlx7981]

I like your longer, easy going videos, not rushed. And I say ruler, it's easier to be understood than "rule."

[@christianzazzali2720]

Good. Keep the meaningful content coming

[@charlieromeo7663]

Very interesting video, Mr. Pete. I’ve no plans to do foundry work, but I always enjoy videos on the subject. The ruler/rule conversation takes me back to my high school drafting class in the 70s. Whenever a student called a scale a ruler he corrected them by saying “That is a scale, I am the ruler!” He always said it with a grin. I think of him and his quote every time I hear someone say “ruler”. He was a fantastic teacher much like yourself. Regarding the length of your videos. In this world of instant gratification, short attention spans, and tick-tock mentalities, if a person just can’t spend 10-20 minutes on an educational video, they simply don’t want to learn. Keep up the great work. You will always have me as a subscriber.

[@mrpete222]

👍👍👍

[@russtuff]

I like your short videos especially because they aren't "shorts" (which I consider to be the herpes of the internet).

[@jmegown52302]

I agree with you on KZbin shorts.

[@MrUbiquitousTech]

Great information! Thank you for sharing on the shrink rules! You just make your shorts as long as you want Mr. Pete, it's all great information. I think the 30 second videos cater to the short attention crowd. It's how KZbin got its start and why TicTok is flourishing. But that audience is the simple minds simple pleasures crowd, they're not trying to learn anything.

[@mrpete222]

I agree with you. Most people even older people have a very short attention span. When I look at my analytics on the videos, most people are watching less than half of it. Some of it may be because the video isn’t very good. I observe that phenomenon with my grandkids and very very very much with the high school kids. A demonstration absolutely cannot last more than 8 to 10 minutes or you have lost them.

[@peterbarnes3121]

Excellent video, Sir. I remember most of this from my community college. This was a wonderful refresher.

[@m9ovich785]

Thanks Much For any length Video Lyle. I think "Shorts" were created to be Teasers & Trailers to get Creators to gain Viewers for add Counts. Mike M.

[@ElmerJFudd-oi9kj]

Very interesting Lyle, you have taught me a new thing again teach. Thanks, I love you!

[@AmateurRedneckWorkshop]

Thanks for another interesting edutainment video. Keep on keeping on.

[@williammurphy3846]

Using a shrink rule as a gag sounds like a fun trick to play on someone. After the inspector lays down his rule to take his coffee break, exchange it with a shrink rule. He or she comes back and begins checking parts again and notices that all the parts are now unfinished but all of the inside dimensions are over sized. The little wheels begin to turn in the inspectors head. Then he or she picks up the rule and there is the rate of shrink engraved in it.

[@g.tucker8682]

Hah!

[@RightOnJonCrane]

I was in the pool!! 😮Great video! Loved the subject and the extra credit. Thanks Mr. Peterson! Yes those shorts are useless! All they do is create anxiety 😦

[@ssboot5663]

I must have a shrink/grow/ tape measure or two or maybe twelve of them. ! Every time I use a tape to build something I'm always off more of my measurements more than I expected!ALWAYS! Thanks for the videos, I learn something every time. I have only heard of scales like what we used in mechanical drawing class. Tri-scales maybe?Scale down rules maybe?I cant remember now.That class was 47 years ago already and I still use some of those skills and don't even realize it.Thanks for the great information!

[@mrpete222]

👍

[@janvisser2223]

Thanks Mr. Pete! This was very informative for me as I have never been into foundry work.

[@thealchemist5376]

Thanks Mr. Pete for the info. Very interesting, never knew about this aspect of the machine shop!

[@ericcorse]

I'm with you about short videos many don't even make sense.

[@4GSR]

At an early age, dad drilled and grilled us kids that it was a "scale" not a rule or ruler!!! So I grew up calling it a scale.... Until now, now I'm confused...😵‍💫 Oh, I have a small collection of shrink rules I've bought over the years. Some are hanging up in my shop, screwed to the wall, so they don't get used for real measurements. As always, thanks for sharing. Ken

[@robertpearson8798]

I never studied about rules because I never graduated.

[@keithschwartz7318]

In my college days, I convinced a fella who was in mechanical drawing class his architect scale was too short. My shrink rule was 3/16 longer. It seemed like a good prank at the time😂

[@mrpete222]

That’s funny. I bet it confused the heck out of him.

[@jimintaos]

Ah, a breath of fresh air after starting my morning off with political news. A couple of things came to mind. First-are the shrink rules longer than than a normal rule according to their metal shrink rate? Second-I enjoyed your story about your Dad's workshop. It reminded me of something about my own Dad. He was an artist, not even a little bit mechanical. He loved gilding frames and while he didn't think I was paying attention while he was gilding or talking about it. Years later, after I was a grown man I found the need to do some gilding of my own. I recalled what I learned while watching him and found that the smell of the gilding size and working with the metal leaf so intensely reminded me of him that he seemed to be standing next to me again.

[@mrpete222]

👍👍👍

[@garyc5483]

Tottally agree about the shorts. I hate them. I have actually disabled "shorts" in KZbin so I do not see them anymore. Thanks for sharing. regards from the UK

[@WCC209]

Thanks for sharing this information. I bought two starrett shrink rules real cheap at a flea market and have been confused about them ever since I purchased them.

[@josesousa8236]

Excellent video Mr. Pete great information

[@angelramos-2005]

I did some castings in silver and bronce.Very good video.Thank you.

[@danielgraf8294]

Thank you for the George Castanza reference!

[@jmunozar]

Couldnt agree more with you that those #short videos are absolutely worthless. Many many thanks for sharing all of this! :)

[@jamesreed6121]

I agree with you on the "1 minute shorts". Yes, the 14 to 15 min short videos are really not short vids. However, I have enjoyed all of Your "short videos". KOKO!

[@mrpete222]

😀

[@davidjames1007]

Thank you Sir, never knew that. Luckily my youtube shop teacher enlightened me.

[@mrpete222]

😀

[@TheAyrCaveShop]

Good one Lyle ! Enjoyed ! Now I just need a shrink ray to fit more tools in my little shop...Lol ATB....Dean

[@kevinkoepke8311]

In Texas it was mandatory for boys to take wood shop in 8th grade. Mr. Osterman was our teacher. His first lessons were about measuring instruments. He would first instill in us the difference between a ruler, 🤴and a rule 📏! I still call them rulers. Thanks Lyle

[@PaulSteMarie]

Heh. I remember my drafting teacher saying we were using scales, not rulers. Rulers were for drawing straight lines. Anyone else remember when wood rulers had a elevated metal edge to avoid smearing ink?

[@mrpete222]

I do. But since we did not have one, we would tape pennies to the bottom of our rules and triangles.

[@SponsoredNot]

I agree about shorts. I skip over shorts. Even from my subscriptions

[@MrFixit1]

Shrink rulers, every man's best friend.

[@steveparker8723]

Worked for a forging company for 30 years. Shrink rules were used by the inspection department everyday . Mostly 1/8th and 3/16 shrink.

[@Siskiyous6]

Mr Pete, quoting George Castanza! Outstanding. I can hear you at Festivis,"I gotta a lotta problems with you people." O yes.

[@mrpete222]

Thank you, Kramer

[@elsdp-4560]

Thank you for sharing. Enjoyed.👍👀

[@AG-ld2qt]

Great information as always. THANK YOU

[@davidphillips7321]

Lyle, relates this to Seinfeld - LOL ...A show about Nothing - Mr. Pete's Show is About Everything and More...Thank you...

[@mrpete222]

😀

[@yomama5785]

Excellent video. I always wondered what the heck a shrink rule was. Seems obvious now, and now I wonder how many times I used one thinking it was normal.

[@jackdawg4579]

Very interesting, I had never heard of these devices.

[@markthebuilder9837]

I have worked with wood since I was 14 (now 61) and had no idea they made shrink rules. Learned something today.

[@mrpete222]

👍

[@davidjohnson242]

Very interesting video :) Double shrink was also explained in one of your extra credit pictures.

[@stancloyd]

I picked up a 1/16" at the Flyweelers show.

[@Wooley689]

Very, very interesting. I'm also interested in the 3-D printing.

[@CraigLYoung]

Thanks for sharing 👍

[@MrShobar]

Nice job. Many thanks.

[@chuckmayerchak3071]

Great video as always. I had no idea such a thing existed! At my age I would want those locked up in the safe so there would be no chance of grabbing one! It's hard enough to get the correct dimensions as is!!

[@Myfriendwaits]

Thanks for the extra credit Mr. Pete.

[@roscoepatternworks3471]

Let's confuse things a little more. I have complete sets of both 1 foot and 2 foot shrink rules. But since we also made patterns from metric drawings I bought a set of metric shrink rules. The difference is metric uses percent of shrink. So you need to know the equivalent shrink for the alloy being cast. You double shrink will be 3/8" and 7/16" rules. As a novelty I have 2 metric shrink tape measures, a 1.5% and 2% both 2 meters long.

[@gordbaker896]

Sorry about your metric disease.

[@roscoepatternworks3471]

@@gordbaker896 i think you misread my comment. The metric tape measures are a novelty because I won't ever use them. But I can use both metric and inch rules equally well. Doesn't matter if inches are in fractions or hundreds of an inch. In each case it's just a unit of measure. One is no better than the other.

[@gordbaker896]

@@roscoepatternworks3471 I can work in both but prefer Imperial. I have a couple Left Hand Tape measures. Clip on Left side of body. I consider Fahrenheit much more accurate than C°.

[@roscoepatternworks3471]

@@gordbaker896 lefthand tape measure is new to me, but I never really looked. Most unusual tape was an engineering tape. Marking was in feet and 10ths of a foot. Used for boat building and civil engineering. I did a lot of shipyard work, in the patternshop

[@gordbaker896]

@@roscoepatternworks3471 I had a very useful tape measure that was stolen from me. If you wrapped it around a pipe, it gave the Diameter! Never was able to acquire another.

[@gokmachine]

Hi, can you in addition explain the phase diagram for cooling metals?

[@markbell2663]

@robertpearson8798 They are referred to as fillet ball applicators or fillet rubbers. They are chrome plated steel (when new) and are to be warmed or heated over an alcohol lamp to to rub wax fillets in corners on a pattern or core box to eliminate sharp corners in the sand mold and add strength along with a smooth transition in the finished casting.

[@mrpete222]

Thanks

[@rossbryan6102]

FUN FACT! DURING THE STEAM LOCOMOTIVE DAYS WITH A VERY LARGE LOCOMOTIVE IN VERY COLD WEATHER, AND A COLD BOILER, WAS 3 INCHES SHORTER IN THE WINTER TIME! THE OTHER OPPOSITE WAS BOILER HOT ON A 95 DEGREE SUMMER DAY!!

[@gregburchfield75]

I learned something new, today.

[@canoflage]

Mr Pete thank you for your video. What modeling software do you use?

[@charliemacrae1045]

Very interesting

[@timhofstetter5654]

I have a set of three of those. Have had for many years now.

[@dannyl2598]

I noticed the slit in the cast table and it made me wonder about how you manage shrinkage there. I assume the opening gets larger so do you compensate in reverse? Thanks again Mr Pete.

[@g.tucker8682]

Interesting question - but no, you don't need to consider a reverse compensation. The shrinking part stays to scale, and simply gets smaller as a whole. As another example, if you heat a metal washer with a torch, the metal doesn't expand inward and make the hole smaller, instead the whole thing just increases in size. All diminsions are larger - hole diameter, outside diameter, and thickness. And when it shrinks, it shrinks back evenly to it's original size. A casting behaves the same way.

[@derekcollins1972]

Would the measurements be the same in reverse? Like having a hot part verses a cold one? Also would size of parts have to be taken in consideration? Good stuff by the way.

[@roscoepatternworks3471]

Short answer yes. I built a pattern for what is called a pivot bin, a vacuum form tool to be cast in aluminum. Three shrinks are required, one 5/32 for the aluminum tool, the tool is the heated to a couple hundred degrees so that expansion is calculated then as the plastic is removed and cooled its contraction is also calculated, into the pattern. One thing not considered, the part was 8 feet long, when I checked the part it was good sent to the customer, it was out of tolerance by .032". The difference, our shop was 55⁰ their inspection room was 75⁰.

[@douglasstovall2395]

How about demonstrating a layout using a shrink rule? I'm having trouble getting my mind around the procedure. I would think the shrink rule would be longer than a standard one? Thanks!!

[@robertpearson8798]

You would transfer the given measurements on the drawing to the layout using the shrinkage ruler and the shrinkage would automatically be added without calculation. In my job we always use the same shrinkage factor (1:160) and our patterns are on the large size so we just do the math.

[@douglasstovall2395]

I realize now that the shrink rules are, in fact, longer than a standard rule. Didn't pick up on that the first time I viewed the video. I guess I wasn't quite awake!!

[@ellieprice363]

@@robertpearson8798 I suppose that for cast iron you’d multiply all the part dimensions by 1.125 and for aluminum by 1.188.

[@robertpearson8798]

@@ellieprice363 That would be one heck of a shrinkage factor.

[@ellieprice363]

@@robertpearson8798 Correct, got that wrong. The shrinkage factor applies the foot of course. So what math would you use for smaller print features, such as a 1.562 hole? Would the pattern hole be smaller or larger? Can’t quite get my head around it.

[@57WillysCJ]

Shrinkage is a good subject as many have problems with casting. I learned about it in the early 80s but was more involved with lost wax casting so I didn't get as much experiance. I do not like shorts either. I consider them clutter on my work bench. I do believe people produce them to get KZbin to bump them up on the viewing lists. The more videos you produce each week the more you are promoted. Since most people don't have the time to produce that much content without total burnout they stick in shorts.

[@mrpete222]

Thank you, so it is merrily another scam in this wicked world

[@brianbutler3954]

I have my great uncles set of shrink rules, I have one Starrett 369 which is 3/8" to the foot I wonder what metal that is for?

[@g.tucker8682]

Manganese maybe? Not sure, but I do know its coefficient of expansion is unusually high. Or maybe some type of plastic such as PET? (Edit: just noticed you said *great* uncle - guess it's not the plastic :) )

[@roscoepatternworks3471]

A 3/8" shrink rule would be used for making a cast aluminum pattern for steel casting. It's 1/8" for the aluminum and 1/4" for the steel.

[@floridaflywheelersantiquee7578]

Thanks for sharing good info

[@swarfscaledrossandflash1884]

I keep my shrink rules in paper sleeves that I made for them. I also keep my model railroad gauge rules the same way. Unless it's a pet-like dog trick or something similar, I don't usually click on really short videos. I like how you keep your videos shorter by putting your addendum/reading/extra credit materials at the end so they can be explored in a more leisurely fashion. Thanks!

[@mrpete222]

👍👍

[@robertpearson8798]

I think that the video shorts are a reflection of the general decline in attention spans and patience.

[@leeroyholloway4277]

Video "Shorts" are designed to feed the phone zombies. Your abbreviated format takes as long as it takes to give a lesson, no problems there.

[@chrisjarvis4449]

if you had a 12" ruler would that be the same as a one foot king

[@Stopes.]

You can make shorts as previews for a main video. Aka green screen. Or an addendum etc. Or just for “short” videos. Like something minor like you bought a new machine tool and have an upcoming video. Let the community know with a short showing off the tool/machine etc. All kinds of uses.

[@mrpete222]

Thank you, I think I will try that sometime if I ever buy anything new

[@michaelboyle1983]

Mr Pete, I liked this video a lot. Thanks. I've been wondering about this subject for a while. Before the extra credit you mentioned we can go to bed now I should've done that but I chose to stay awake for the extra credit and I'm glad I did now but I'll probably regret it in the morning. In reference to 13:35 in the video at the bottom of the picture. Does metric steel shrink different than American steel? Haha. I'm just kidding. God bless you and your family!

[@mrpete222]

Yes, I had some Egyptian steel, and it shrinks greatly

[@bobjimenez4464]

This one brings back the good old days with Mr. Hatfield in metallurgy at Don Bosco. He called them shrink rules but we were taught to call them shrink scales in manufacturing.....The war of the technology instructors. : ) The drafting instructors called them scales too but they could have been in collusion with the guys from manufacturing.

[@mrpete222]

👍👍

[@eliduttman315]

Lyle, once again, I'm late to the party. I'm approx. the same age as you and attended high school (Brooklyn Tech) 1959-1963. FWIW, we were taught how to make ANY needed shrink rule not already on hand. You lay out a right triangle whose hypotenuse length includes the shrinkage factor and 1 leg the "ordinary" rule. Carry the "ordinary" rule's divisions up to the hypotenuse, which becomes the desired shrink rule.

[@mrpete222]

Thank you very much, I need to try that on scrap paper