ROBRENZ ATD #1 INTRO, 3 PLATE METHOD

[@StefanGotteswinter]

Brilliant, great content there, thank you Robin!

[@ROBRENZ]

Thanks Stefan, and thanks for watching and commenting.

[@EdgePrecision]

I just barely watched this. Thanks! For the call out. I didn’t even know you watched my videos. I am so impressed with your technical ability. You do things I would be very hesitant to try. The caliper videos Wow! Your name of your video series is dead on. I am looking forward to your future videos. Again thank you!

[@ROBRENZ]

Thanks Peter, I think the same thing about the amazing stuff you do. You are obviously the real deal.

[@jonnyseim]

Peter, I was recently made aware of your channel as well. You both have been more valuable than my college degree.

[@oxtoolco]

Great title! I kept looking at that oil spot on your shirt....... Bravo my friend! In case you guys weren't paying attention to detail Robin showed a clue on how his Repeat-O-Straight-O-Meter works. I love how Robin just says stuff like, " Should be sub 5 microinch TIR, probably better......." End quote. Talk to you soon. --Tom

[@ROBRENZ]

I think that spot might have been from dinner. Thanks Tom, means a lot coming from you. ATB, Robin

[@simperous4308]

There are only 2 youtubers whose videos I watch the second I get a notification. This Old Tony, and Robrenz. And Rob is miles ahead when it comes to sheer skill and knowledge. Great to see ATD starting. I’ll be watching avidly!

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@Ropetangler]

Not arguing about the quality of the twoYou tubers that you mentioned, but you need to check out Clickspring!

[@alexgalloway7690]

I've been a toolmaker for 40 years, but have picked up so many useful tricks since discovering your channel .

[@ROBRENZ]

Great to hear!

[@Metallurg33]

Had to watch it 3 times, I would get so fascinated by thinking about one topic I would miss the start of the next. Great stuff!

[@FredMiller]

LOL me too!!

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@Neo7CNC]

Robin, You're a great teacher. Thank you for sharing your knowledge. All the best, David

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@SolidRockMachineShopInc]

Thanks for another great video and the shout out Robin. Steve

[@ROBRENZ]

Thanks Steve, and thanks for watching and commenting.

[@RayLautenschlager]

Perfect name for these shows and fits your approach to machining and precision.

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@longlivepunk]

Loved it, Robin. Don't need any bells and whistles, just good informative content brings us all back! I for one am looking forward to more ATD's!

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@braxtonec]

The three plate demo with paper stick figure precision instruments brought the whole concept home very effectively. You are an excellent teacher. Thanks again!

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@dannymaciejewski]

Great video Robin! I’m looking forward to seeing how you will get those spindles to sub 5 millionths!!! Wow! Isn’t that 1/10th of a micron? Stefan will cry himself to sleep when he sees this...

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@iainfletcher6388]

'...ultra precise, hopefully...' I think we all know there's no need for 'hoping' or 'luck' to achieve that! No substitute for skill and experience. Can't wait for the follow up videos.

[@miamatti]

You and several other youtubers have inspired me to continually expand my breadth of knowledge and strive to be as good as I can be at whatever my career will be

[@ROBRENZ]

That is really encouraging to hear, thanks for sharing that.

[@paulwomack5866]

Loving the (working...) cardboard repeat-o-meter!

[@mikemarriam]

Perfect name for your new feature. I admire your measured and thoughtful responses to your viewer's "concerns" which experience from other channel creators has shown are often expressed in a harsh manner.

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@outsidescrewball]

Enjoyed Robin....honestly some of the info is above my pay grade....but I am always trying to learn and you are a great mentor...ATB

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@ianjoubert7505]

Robin, thank you soooo verrryyy much to take the time to make these videos! I know you are a very busy man, and these videos are time consuming, but that being said, you must know you are a enormous inspiration to many people around the world! Wish I could give you 100s of thumps up! Thank you once again!

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@riaandewinnaar5040]

Clearly described. Thanks for sharing your years of experience.

[@ROBRENZ]

Glad it was helpful!

[@jonnyseim]

Rob, thanks for your time. I have learned a valuable lesson from every video you have produced. I run a DMG MORI lathe with integrated Fanuc robot loader and ZEISS CMM 100% inspection. I make automotive components and “attempt” to hold a few tenths for 15,000 pieces a year. I appreciate your content and continually look forward to your next post. Thanks, Jonny.

[@ROBRENZ]

Thanks for watching and commenting.

[@chrisj4570g]

Love it, love it, love it. Thank you for sharing your knowledge.

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@mrblack61]

The 'two footed twist gage' is new to me, such a simple quick to use tool! Cheers Robin

[@ROBRENZ]

Thanks for watching and commenting.

[@StraightThread]

Rich content, Robin. I enjoy your explanations of the subtle details, concise and accurate, just like the machining work you produce.

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@69100leegrant]

I cannot stop watching this channel. Great stuff.

[@ROBRENZ]

Glad you enjoy the content!

[@adamscholl3996]

Thanks so much for taking the time to share some of these projects on youtube and instagram. As a mehanical engineering student I've gotten an enormous amount of insight into the "why's" of what I'm learning and it's so helpful to get a peek at your perspective. All the best, -Adam

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@xxxmmm5942]

Does not matter how much one knows but how well he can explain it. So many of us will benefit from these series. Great job, Rob and thank you.

[@ROBRENZ]

Thanks and thanks for watching and commenting.

[@Bunnyonabender]

You and Tom among the many many others are the best education many of us have access to. Thank you Robin

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@andrew_the_machinist]

30secs in and I already like the title enough to hit the thumbs up! "Attention to Detail" is my motto. Say it a thousand times a day, as critic or encouragement to others or in my head to myself as the same.

[@ROBRENZ]

Thanks for watching and commenting.

[@junkmail4613]

3:14 to 7:23 Very clear and succinct description. Thank You so much. About 1961 (I was about 10 years old) My dad took me to Bell Labs in Whippany NJ (where he worked) to see the first ever laser length measuring research device, a 2 ft x 3 ft x 15 ft slab of something (weighed tonnes) supported on fulcrum knife edge type supports(again I was only 10 relative to my grasp of the supports and process), and he showed me that just walking on the concrete floor next to the device changed the laser measured length. I was so impressed then, but I now find it absolutely incredible, and you sir take me back to the wispy times of my own pre-historical memories. I believe you "do measurements", test and verify, and make very real in a realm so inconceivable and incomprehensible to the average layman, that is as astronomical, and Hubble's constant, are so far away from "Pass the Salt Please" This poor example may make little sense to you, but I'm trying to express that I am extremely impressed, without insulting your incredible integrity, by my humble offering. I had forgotten, if I ever knew, that people like you exist. Again you make real, and test and verify, things that others I'm sure have no concept of.

[@ROBRENZ]

Thanks for the very kind words and glad I could bring some good memories back!

[@junkmail4613]

All credits to you! Thanks Again.

[@r.j.sworkshop7883]

Thanks Robin for taking the time to share your thoughts and tips. Even if your discussion points aren't something that I can use in the near future, it always makes for a good thought exercise. ATD=perfect!

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@GaryGrumble]

The density of information on your videos is amazing. Thank you very much.

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@moeszyslack4676]

I saw the title and didn't know what this video would be about. What a pleasant surprise. I don't make videos, but I can only imagine how much time it takes to make one, especially these kinds of videos. Even though most of what you do and show goes over my head, it is a joy to watch and (try to) learn. Thanks Robin and I know I'm not the only one looking forward to more content!

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@tpt100t]

I think I just got another education by you. Thank you for sharing you of your vast knowledge of precision fabrication!

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@douglastedder1694]

i watch these videos multiple times and dont get tired of them. seriously. its been said many times and im sure it will be said many more... but thank you. thank you for sharing your relentlessness with us.

[@SteveSummers]

Wow, Robin, I was wondering where they were coming from :-) . Thank you so much for the shout out. I just caught this video at lunch today and have been looking forward to having the time to check it out and what do you know, A shout out from someone I look up to. Thanks again Great content Robin I love the detailed explanations and always learn just how little I know:-)

[@ROBRENZ]

You are welcome, thanks for watching and commenting. ATB, Robin

[@rodfrey]

Thanks for all your work in putting these out. It's a real gift to the world for you to share your experience (yeah, I'm sure the $4.87 payout each month is nice, but really....) The only complaint I have is that it's your fault that I'm reading the Foundations of Mechanical Accuracy, and now I regard my mill the same way I do an angle grinder.

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@EmmaRitson]

Awesome! lots to process there, I napped though the first time, and watched it again, hopefully i retained some. thanks as always for support and inspiration!

[@ROBRENZ]

Thanks Emma, and thanks for watching and commenting.

[@bkoholliston]

Very nice! Much of the info is straight out of Foundations of Mechanical Accuracy but not widely known, so it is great to see it presented.

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@joshua43214]

Teaser...ugh...Really looking forward to this. BTW, great idea for the new series, perfectly named.

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@bostedtap8399]

Excellent presentation, and most importantly, true theory and method for geometric generation of accurate mechanical engineering. People also forget that there are calculations for the gravitational influence on optical light systems, for example using a theodolite. Fantastic teachings, and please keep up the good work.

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@Maxi-hs5nk]

Many thanks Rob, appreciate you taking the time to teach us! ATB Max

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@joepie221]

Hi Robin. I enjoyed the paper gages you showed. I have never seen those before. Clever concept. Thanks for the listing in your header. Much appreciated. As for your title, I like it. Too many people skip over small details that make all the difference. Just ask some of the people on amazing race that don't read the whole clue and ended up going home.. What type of lathe/machine did you use for the height gage demo? The slotted table in the background threw me off. Take care.

[@ROBRENZ]

Thanks Joe, it is a Tormach slant pro with the full gang plate mounted. Thanks for watching and commenting.

[@onecrisde]

Thanks for the visual representations as you explain complex principles. Without which, it would be impossible to understand. While I don't yet have the skill-set instruments or machines to execute that level of precision, I am certain the exposure to that knowledge will influence my work over time.

[@user-gr4hb2yn3x]

Awesome to see a video series made by you. Can´t wait for the next episode.

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@josephwilson6651]

Some former coworkers have lamented the loss of American precision machining, and the appearance of offshore(Chinese) measuring tools, which mimic American form factor,are much less expensive, and while not as precise come very close, but miss the mark.I can now direct them to observe your channel for their precision high.As I have also done. Thank you,Mr. Renzetti

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@nathanmasi3766]

Great video! Love the variety of content and the level of detail you went into with each topic. Thanks for putting in all the work to make these videos for us all!

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@jeffreylehn8803]

Well done Robin , I enjoy the videos that you make .

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@ronpeck3226]

Robin Thanks for taking the time!

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@luckenbachmachineworks7000]

Thanks for taking time to share your insights. To a novice like me they are very eye opening as to the precision and accuracy that is really possible to attain in machining. I have a looong way to go!

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@rhysd5410]

Hi Robin, could you put the KZbin channel recommendations in the notes? I couldn’t quite find some of those you mentioned. Btw, very much enjoyed the inaugural “Attention to Detail “

[@lwilton]

Roben mentioned: Stan: "shadon hkw" Steve Somers: "steve somers" Steve Barton: "solid rock machine shop" Peter: "edge precision" Joe: "joe pieczynski" And I'd add: Stefan: "Stefan Gotteswinter" Adam: "abom79" Tom Lipton: "oxtoolco" These should lead you to even more interesting content.

[@anothermoth]

LMGTFY Stan Zinkovsky, grinding, electrical, bar z: kzbin.info Steve Summers, shaper, tooling: kzbin.info/door/jrGHSAkAN0ac8aVejwPBvA Steve Martin, tool & die, home shop setup: kzbin.info/door/KPqKYF73sJbFUSzo5dQxtQ Edge Precision, cnc, oilfield work, setups: kzbin.info/door/CkSr3M8GXbS4txqPY7OMxQ Joe Pieczynski, tips & tricks: kzbin.info/door/pp6lgdc_XO_FZYJppaFa5w

[@TraditionalToolworks]

Very fitting name! Glad to see another video! Very useful on understanding the 3 plate method. :)

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@886014]

Thanks Robin, I think that was one of your best videos. Many people are confused over 3 plate self-generation and the requirement to also rotate the plates, and you explained that very well, even managing to slip in a heigth reference, though minus one point for then slipping back into English, ha ha. Using a twist gauge was brilliant and one of those "doh!" moments and I use a level and never thought of doing ways that way. It will be very interesting to see that spindle coming along, it sounds quite remarkable. Thanks for continuing to raise the bar.

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@billythebake]

Hey Robin, just wanted to thank you for putting up such a nice sampling of machining & metrology. Fun to get a glimpse of the world past the hotwrench, drill press, and angle grinder!

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@reedmiles9548]

It's going to be one of my favorite series to follow, thanks for sharing your knowledge.

[@ROBRENZ]

Thanks for watching and commenting.

[@Factory400]

"In the sub 5 millionths TIR range......." Whaaaaaat? That is not precision. That is PERFECT.

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@cnc-ua]

Awesome format, Robin. Appreciate your time for putting this together. Go go ATD #100

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@ianbertenshaw4350]

All i can say is man it is good too see you back !

[@ROBRENZ]

Thanks for watching and commenting.

[@jonludwig8233]

Hey that toolroom spindle looks familiar!

[@MrJugsstein]

Glad to be in at the first episode of ATD. Now I'm finally go to have to break and join instagram if your there. Thanks for your time. Will

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@cnc-ua]

Thank you, Robin I miss these types of videos gathered together. Instagram style has lack of comprehensiveness

[@Krzys_D]

Your attention to detail in this attention to detail video has really good attention to detail.

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@RGSABloke]

Robin, between you and Lipton my brain is going to explode, you guys make the very complicated very understandable and for that I thank you both. Kindest regards. Joe.

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@zsigmondkara]

'I don't think so, Tim' perfect impression xD Amazing channel, keep up the good work!

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@SaltFlatMonte]

Fantastic demonstration with the foam blocks and paper tools. Looking forward to sharing this with my students. Great video and looking forward to the series.

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@yosmith1]

So happy to hear you're going to do these series! As always, thank you so much for sharing your experience and knowledge.

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@kevCarrico]

incredible information - great video - thank you!

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@Dans-hobbies]

Excellent, another regular series to get addicted to! :-)

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@unknownapprentice625]

Like the new series, details do make the difference! Also more opportunity for the Apprentices in the audience to learn :) Thanks Robin.

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@literoadie3502]

The first time I've ever heard any of the KZbin channels mention Joe Pieczynski. I was beginning to wonder if people had some beef with him. I always thought his content was fine, certainly better than some other guys that some of the bigger channels often praise.

[@ROBRENZ]

No beef with me! He's a great guy with great content.

[@michaelschnock3998]

"I dont think so , Tim?? " lol --- well placed small joke good content, useful information and as every time well explained . Thank you for sharing, i ll wait for the next episode .

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@EDUTAMARIU]

Thanks for showing the two foot gage, didn't know about that, best regards from Barcelona and keep it up!

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@James-fs4rn]

Greatly appreciate your willingness to share things that can't be found in schools anymore! No reply needed as I'm sure you have enough, just know what you're doing means a lot. Thanks!

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@lornie212]

I like this format and subject matter....... thank you Robin!

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@pierresgarage2687]

Good idea about the series... You're sooo right about the time it takes to produce those videos.... ;) ATB, Pierre

[@ROBRENZ]

Thanks Pierre, and thanks for watching and commenting.

[@cosimomarotta9552]

Robin, many thanks for sharing your knowledge and experience. Atb from Italy

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@ianmorcott3113]

Great topic. I would love to hear more about your current surface grinder with your thinking about how and why you modified it to get the accuracy and reliability. And lastly, why and how you selected your new grinder. Your time and knowledge that you share is very appreciated.

[@ROBRENZ]

Thanks, I will try to cover that and thanks for watching and commenting.

[@Volcker1929]

Props on the props, they were simple but really helped explain the concepts. Thanks you very much for taking the time to make these videos. This is a great format and I learned a lot.

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@pablogamba1651]

Don't forget to mention Stefan from Germany, he gave props to your video on grounding stones 😁😁

[@davidlee7319]

Looking forward to these. Attention to Detail is a great name, very apropos.

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@turningpoint6643]

The title fits more than well Robin and as always an impressive amount of tricks and information shoe horned into each video. Very clever idea with the backplate's two flats for vise use. You'll hit over 100k of subscribers before this years finished I think.

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@ianjoubert7505]

Looking forward to episode #1592 of atd!

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@ActiveAtom]

We are learning a lot from Steve and family at Solid Rock grinding knowledge is really way up there lots to learn from them and so much more that I thought I knew and did not and now we do.

[@bcbloc02]

Great stuff. I love the technical side. I think whiffletrees are scary in application since if the pivot is not exactly balanced to the forces it imparts twist easily. What material are you using for your spindle blocks?

[@ROBRENZ]

Thanks Brian, The spindle blocks are A2 at 62RC and thanks for watching and commenting.

[@ScottGMerritt]

Thanks, Robin. You are one of the best!

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@Timeonabike]

Thank you! A great explanation of the 3-plate method.

[@simonsaelaertfurniture9883]

Good to see you again on youtube, Looking forward on what appears to become a highly interesting series. Thanks for sharing.

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@intagliode]

Awesome Robin! Always learn a lot from you. You've been teasing me with all that cool stuff on Instagram for awhile. Nice to finally get a more comprehensive update on your latest projects! Keep up the great work!

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@Ujeb08]

Rob, thanks for turning us onto some good new channels!

[@ROBRENZ]

Thanks for watching and commenting.

[@PeregrineBF]

One question with rotating in the 3-plate method that I've had is does it truly need to be 90 degrees? That's certainly the angle that leads to the fewest necessary rotations, but AFAICT any shape with symmetry C_{n} with n>2 should work. (rotation by an angle of 360/n does not change the apparent object). So a triangular surface plate should work fine, you'd just need to check three times: once at 0, once at 60, and once at 120 degrees. A square (or octagon, or other multiples of 4, or a circle) works quickly because you can check twice: once at 0, once at 90 degrees.

[@ROBRENZ]

It has to be 90 degrees for the plates to match to get full bearing on square plates but your other points are correct.

[@mishun]

That question actually got me interested. Example from the video looks like hyperbolic paraboloid, i.e. in cylindrical coordinate system with origin in the center of square plate and angle measuring from the middle of one of plate's sides it's something like: z ~ r^{2} \sin(2φ) And indeed it is fixed under 180 rotation and "plate copying" operation (z -> -z and φ -> -φ). But now you can easily construct similar example that is fixed under 90 rotation: z ~ r^{4} \sin(4φ) And by analogy an example for any rotation that is a even fraction of 360. I think higher harmonics are less nasty because in practice we are not magically copying one plate onto another, but making strokes of finite length that should preferably remove high spots in some directions on that finite length. The problem with hyperbolic paraboloid is that it's perfectly straight in some directions. So practical advice for someone who is trying to use 3-plate method for rectangular plates should probably be to try making strokes in different directions.

[@motorbreath22]

Man you are on another level, I wish you could just post videos all the time.

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@RRINTHESHOP]

Thank you Robin, This will be a great series.

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@curtisvonepp9716]

I've been watching Mr. Renzetti for years had a dream I was his equal more or less and woke up shocked he shifted to a higher GEAR.

[@houseofbrokendobbsthings5537]

Well done Robin boy do I feel like the guy that brought the intellectual knife to an intellectual gunfight. Well done sir you do yourself proud. _Dan_

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@FredMiller]

Just two words..... Awesome Thanks for sharing!

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@StevenJevnisek]

Hi Rob: Very interesting and useful information! Do you have a reading list? Aside from Machinery's Handbook, other good reference and instructional books? Keep up the good work!

[@bathedincloudsofblood]

"Foundations of Mechanical Accuracy" and "Holes, Contours and Surfaces" are two that come to mind i believe i heard about on robin's channel. not sure what videos, though

[@ckvasnic1]

Great Stuff Robin... Thank you! Thank you for your time and sharing your talents!

[@ROBRENZ]

Thanks and thanks for watching and commenting.

[@Sketch1994]

Love the demonstration, love the explaination, and the conclusion is solid. Also I think I'm gonna try to relief a parallel's bottom to make a 2 footed twist gauge, but I should probably remove an equal amount of material from the top to avoid warping.

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@petergregory5286]

Hi Robin, This certainly taught me a lot I didn’t know about accuracy. Am now looking forward to seeing future videos on the subject. At my age and with the machines available to me I’ve no real use for this knowledge other than as knowledge. Keeping life interesting though. Regards

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@belair_boy6035]

Ten thumbs up, I can't wait for all the up coming content. Please keep up the good work.

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@ramirezt8219]

Just wondering, if you lap two stones in a circular motion, you should/would not end up with two stones with a matching twist in them. No?

[@ROBRENZ]

Correct, I mentioned the 90 degree rotation was necessary to detect/remove the twist that could occur.

[@johnmcdonnell6109]

Great explanations and demonstrations! Really enjoyed the lesson!

[@ROBRENZ]

Thanks, and thanks for watching and commenting.