MAKING GROOVING BORING BARS

Making a group of carbide tipped grooving boring bars. CAD design is covered as is a method for repeatable location of the bars in making them and using them. Lots of grinding setups and non typical lapping techniques. The boring bar shanks are ground out of hardened dowel pins.
#practitioner_of_the_mechanical_arts
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[@StefanGotteswinter]

Your Commentary at 45:00 is SO powerfull. Thank you Robin!

[@ROBRENZ]

Thanks Stefan, and thanks for your support and friendship! ATB, Robin

[@Engineerd3d]

New Renzetti video up. Forget sleep, need to do the first round of watching. Then come back tomorrow and watch it again for better understanding. Thank you Robin for such informative videos. You rock.

[@oxtoolco]

Chuck Norris approves this video. It probably didn't take him much longer that the actual video to do all of the tools. Great work Robin! Cheers, Tom

[@forrestaddy9644]

Tom, ever wonder how Rob splits firewood or builds a barbeque? I'd like to be a fly on the wall for the tool prep.

[@ROBRENZ]

Thanks for watching Chuck! ;-) ATB, Robin

[@shantk7378]

It makes me very happy to see craftsman like this practicing craft with such high degrees of technicality, and with the intention of practicality out of their own little shops. What a fantastic imagination, fantastic engineer, fantastic technician, and a fantastic understanding of materials and processes. Rob is in a league in which very few people reside. Its a tragedy that the spirit and craft of people like Rob go unrecognized even by their own "kind". I can only imagine that such a high degree of forethought comes (partly) from an intimate relationship with hindsight.

[@ROBRENZ]

Thanks for the very kind words.

[@Pappaoh]

I get so much out of your videos, Robin. I genuinely appreciate the time and effort you put in. It's always a pleasure and a serious learning experience when you post, and learning is truly one of my greatest joys! Glad you're safe and well, and I hope the same is true for your family and loved ones. Keep the great content coming, and I really look forward to a follow up to your Renzo-meter/flatness/repeat-o-meter work you started a couple years ago. I have an everlasting appetite for insight, and you bring gold with every post. Cheers!

[@ROBRENZ]

Thank you for watching

[@TAWPTool]

This is well above my pay grade and abilities Robin, but I thoroughly enjoy your videos for that very reason. Thank you for sharing!

[@ROBRENZ]

You're very welcome!

[@dziggy3004]

The jack screw UNDER the VISE is another EASTER EGG for every machinist!

[@camperlab6546]

When I first went to a professional baseball game, I thought to myself, "right there, in that field, are people who are the absolute best at what they do." I get the same feeling from Robin.

[@priority2]

It’s so wonderful being privileged to watch a scientist/engineer disguised as a machinist work his magic! Thank you Robin. You are truly amazing!

[@forrestaddy9644]

Tool grinding by the numbers with the object of making them interchangeable: amazing concept. Back in my day, I was thrilled if my free-hand internal O-ring tool even made chips. Remarkable what a difference the right equipment and a well-planned approach does for obtaining first time success. Fascinatin' journey Robin. Thanks for the trip. My younger self is green with envy.

[@ROBRENZ]

Thanks for watching Forrest! ATB, Robin

[@waynesmith6681]

You make this retired tool maker wish he had another lifetime to live and perfect his skills. Thank you so much for what you share!!

[@ROBRENZ]

Thank you very much!

[@TheTacktishion]

An hour of shear MECHANICAL GENIUS....! Such a pleasure to watch you work, and your videos puts us right there where we can see it all happening. Hopefully your camera didn't melt during the silver soldering process. Great camera shots. If all machining channels had the quality content and camera work that you provide.... I can only hope....! THANK YOU....!

[@ROBRENZ]

Wow, thank you!

[@nameofdane]

44:53/59:43 Really appreciate this note on the value of doing the time-consuming or tedious things sometimes. People give me crap for wanting to do things myself even if I don't always enjoy them rather than hiring a professional and I always tell them, 'I already know how to spend money.' Great video as always, Robin.

[@YourOldDog]

Some day every one has an estate sale, I pray I don't miss yours !! You gotta be the best machinist on KZbin by far !!

[@Ihorecek195]

Damn, was prepared to go to workshop but that will wait now! Thank you Renzetti

[@MrRShoaf]

Robin has my vote for Guru! I never fail to learn something valuable watching any of his videos.

[@glennfelpel9785]

Absolutely outstanding content. Thank you for the many ideas and for pointing out the pot holes along the way. I had never thought about what happens when we clamp a vise within a vise. Good one of Many. Thank you for all the effort it takes to put on a video like this.

[@ROBRENZ]

Glad you enjoyed it!

[@willjosephson]

More like MAKING GROOVING INTERESTING BARS amirite? Robin, thanks for your expertise and professionalism and your willingness to share your process. Always really interesting and informative.

[@ROBRENZ]

Wow, thanks!

[@HanstheTraffer]

I watch Robin's videos slack jawed...As much as I watch I still have have a hard time believing that someone is this good in our fallible world.

[@lloydrmc]

Wow! Your narration is a model of clarity. No way I could have even begun to understand otherwise. So much valuable information/ explanation here.

[@ROBRENZ]

Glad you enjoyed it!

[@alexanderhowa9707]

Two videos in a few weeks. Must be Christmas. Thanks rob.

[@greggroos2271]

So much there to unpack and apply to my own practice. Best part: so clearly narrated and shot that a second viewing is not needed.

[@MrJwallone]

Great grasp of knowledge on what needs to be dead nuts perfect and what can slide. Thanks for putting out another video Robin.

[@pierresgarage2687]

The amount of small details to be dealt in order to get the desired results, and, in your case making many units and achieving repeatability. An hour well spent watching...

[@ROBRENZ]

Thanks Pierre!

[@WrenagadeWorkshop]

The grinding guru strikes again with another fantastic video packed to the brim with takaway brain food and heaps of inspiration. Thank you Robin, loved every second :D

[@matthewwest8689]

Thanks as always Robin. Great point about being able to develop skills as we go!

[@mortezarahimi6784]

I just finished watching this video. And i should say that: sir, thank you for sharing these. Educational More than 10 handbooks.

[@ROBRENZ]

You're very welcome!

[@youcoulduseit7492]

Like I said Robin, If you got the energy . Please dont hesitate to make more videos. Just seeing the tools, order of operations.and the considerations of will it rub. I'm making swiss type tooling for a sieg C6 lathe four position. Every thing with adjustable hight(hate shims)Probly a er 16 collet position with that repeatable pin ,Basicly so it pulls out and you can choke up a smaller boring bar. most of it made from the throws of a small block chevy. You kidding me I get up at 5 am to do thi9s stuff love it. Thanks Robin you save alot of trial and error

[@gyrogearloose1345]

Thanks very much for this Mr RobRenz. Most enjoyable and inspiring. Your comments about 'developing skills' at 45:00 sum it up very well. Onwards and upwards as my good old father used to say! Kudos for your camera and video making skills as well . . .

[@ROBRENZ]

Glad you enjoyed it!

[@georgestone1282]

Thanks for giving everyone something to think about even though not everyone is going to grind their own tools. I have a tool and cutter grinder and still enjoy your methodology. It's not necessary to own every machine made. As is said on a KZbin channel, " GET ER DONE " GREAT VIDEO 👍

[@donaldvantongeren8385]

Robin it is just unbelievable at what level you are, thanks for sharing this wealth of knowledge!

[@ROBRENZ]

Wow, thank you!

[@rlsimpso]

The tip about vise clamping is excellent. Thanks.

[@LocoFabandMachineworks]

Thank you very much for sharing Robin We really appreciate the effort involved in putting it all into a video

[@ROBRENZ]

Glad you enjoyed it!

[@urrick33333]

Wow. That’s some cutting-edge technology right there. Awesome.

[@5tr41ghtGuy]

"cutting-edge technology" - I see what you did there ;-P

[@ianbertenshaw4350]

I can't seem to find a word that could possibly pay a high enough compliment to you for this video Robin ! You didn't just raise the bar with this one - you launched it into space ! Thank you for the incredible effort it must have taken to film and edit this video ! I learned many things from it and it entertained me immensely !

[@ROBRENZ]

Wow, thank you!

[@elyedwards5181]

I would like to thank you for the amazing content. And make a request for a video on the modifications you did on your punch grinder. Thank you again sir

[@ROBRENZ]

Great suggestion!

[@johnreese3943]

Thank you for another great video. You are way out of my league.

[@johnspargo5876]

Thank you Robin - for your gift of knowledge. i see you're up late!! kind regards from John Spargo in Cape Town

[@ROBRENZ]

My pleasure!

[@RRINTHESHOP]

You have great skills Robin, a true master. Challenging ones self is the only way to better yourself. Oh very nice tools by the way.

[@ROBRENZ]

Thanks Randy and thanks for watching! ATB, Robin

[@rgmoore]

Robin, thank you for sharing your knowledge and amazing skills.

[@ROBRENZ]

Glad it was helpful!

[@hdheuejhzbsnnaj]

You gotta love when he clarifies that there is "no need to go crazy splitting tenths" when grinding relief and then 5 seconds later he's dialing it in within 3 tenths.

[@TheRlovett]

The workpiece dials itself in when it sees Robin enter the shop

[@shiro-r4m]

Another video, what a treat!

[@ROBRENZ]

Glad you enjoyed it!

[@robertodimartino7412]

Thanks for another fantastically informative vid Robin. This answers so many questions, thanks for the time you take in making these informative lessons.

[@benjamine6703]

Great work, pre-planning helps a lot. I always had some trial and error efficiently making parts like this. Thank you for recording your work, (probably adding 5x the time to making parts) it makes things a little less complicated for people who do this the first time.

[@maxfarr4142]

I'm an electronics engineer, and hobby machinist, but I've spent my life fascinated by the toolmaking profession, but seldom get good insight into the deeper details of this craft as there are so few avenues for access when you don't work around this kind of thing. Thanks RNZ et al (Stefan G etc) for sharing these skills in such great detail. So entertaining, enjoyable and Sincerely appreciated!

[@ROBRENZ]

You are welcome!

[@magicbytes3835]

WOW, you are so patient, nice work, thanks for sharing your skills, cheers from me. 😷👍👍👍

[@andyZ3500s]

Your videos give me the confidence to try things that I would of hesitated to do before. I like what you said about making a tool instead of buying one if you have the time. The learning experience will pay off down the road.

[@ROBRENZ]

You can do it!

[@bobtherat99]

Thank you Robin. I found this fascinating.

[@maxcnc777]

Awesome as always. The commentary on grinding your own vs. buying, was perfectly timed, as I was already heading down that path. Thanks for the course correction. Tool geometry is one thing that is seldom talked about..x angle clearance vs. y .. positive, negative or neutral rakes and so forth and oh yeah, for z material. Those are all variables that can drive even an experienced guy nutz!

[@ROBRENZ]

Glad you enjoyed!

[@piroman16tnt]

As always - very informative and inspiring video. The amount of knoweledge You have and You share is remarkable.

[@ROBRENZ]

So nice of you

[@greybeard9x44]

A really helpful video. Very clear exposition of making a job simpler than it might have been, with lots of points of technique that carry to all over the place.

[@bigbattenberg]

Having acquired a very good surface grinder recently, I hadn't yet considered the full extent of possibilities in tool grinding and grinding carbide. As luck would have it, I also stumbled upon a heap of special carbide tools which somehow gotten into the hands of someone who didn't realize what it was. All new stuff, special grinds. I inquired at the company that made them because I could not really figure out what the tools' intended use was. Turns out it it made for brass, two lip cutters running on transfer machines. There was a company in my town who reorganised and relocated and obviously these tools were obsolete. I figure the bars (from 10 to 25 mm in diameter, some quite long) will be very good stock for grinding special carbide tools. Thanks again for a great inspirational video.

[@dpeter6396]

Beautiful work! Your narrative and video quality are exceptional and I learned some really good techniques!

[@ROBRENZ]

Thank you very much!

[@raindeergames6104]

Rob I just want to thank You alot for the knowledge You share. I dont think You guys realize how much You enspire us young generation of people interested in the subject of machining to try and be better and attain a higher level of expertise. You are greatly appreciated.

[@Casey_Schmidt]

Robin, thank you for taking time out of your day to share this amazing information!

[@shantk7378]

Another fantastic video.

[@ROBRENZ]

Thanks again!

[@KristoffRand]

talk about teaching a man to fish... you can make tools for me any time. great video... Im just a machine tooling groupie i guess... i only gave 2 crappy old vices and a grinder. your shop and your vices are awesome. I used to run a 2 table 3 axis cnc and 20 years ago carbide bits and mills cost 60 to 150 dollars per bit. you coild save thousands and whatsmore it allows you the liberty to be more experimental with your orojects knowing you can afford to replace mills. great stuff... really super informative and your delivery was easy to follow. thanks for making it. subscribed

[@ROBRENZ]

Glad you enjoyed it!

[@sharkrivermachine]

A lot of great ideas as I am developing tooling to use my surface grinder for tool and cutter grinding. Thank you for sharing your knowledge and techniques.

[@ROBRENZ]

Glad it was helpful!

[@slausonm]

Thank you for another educational video. I’m going to apply some of those concept in what I do.

[@ROBRENZ]

Glad it was helpful!

[@jasonh3109]

Wow!!!! The amount of information you give is mind blowing. Thank you!!!!!

[@ROBRENZ]

Glad it was helpful!

[@MrJugsstein]

Wow. Thank you so much. Really makes me feel I missed out not doing tool making. I really get great joy watching your though process and execution. Some people watch violin. We watch Robin

[@ROBRENZ]

You are very welcome

[@Jeffen]

thank you for another great and entertaining video

[@ROBRENZ]

Glad you enjoyed it

[@homemadetools]

Excellent video as always. We shared this video on our homemade tools forum this week :)

[@ROBRENZ]

Awesome! Thank you!

[@joeldriver381]

I never watch one of your videos and not learn something. Thanks for taking the time to make these. I know how much time it takes...

[@ROBRENZ]

Glad you like them!

[@jmtx.]

Thanks for a video on such detailed workmanship. Lots of items to practice now.

[@MCEngineeringInc]

👍🏻👍🏻 One of the great things about machining is there is always another way to do something. Always enjoy your videos!!!

[@jimm2099]

Awesome content as always Robin, I'm going to have to binge watch a bunch more of your videos. Thanks!

[@andrewut7ya511]

Love your videos. Im not a machinist but i appreciate the precision. The smallest units i work with would be a 64th, which seems like a mile compared to your measurments. I build custom battery packs for a living but i watch machining videos because alot of concepts and thought process can be used in any kind of work. Thanks for sharing.

[@chrismate2805]

Perfect illustration and explenations, interesting how strong the silver solder joint is.

[@DudleyToolwright]

Another amazing collection of tips, tricks, and fixturing ideas. You are an indispensable asset. Thank you so much for sharing.

[@jameslezak8179]

Great video! The light bulbs just kept coming on thru the whole video! 2nd video of yours I've watched so I'll stop here for awhile and absorb a bunch of this into my shop routine so it'll be sort of engrained so I won't have to keep reviewing the 2 I've watched... Bunches of technics here but my mind is fitting them in to some things that are already on the list! Thanks for your time and sharing! 👍😎

[@christurley391]

As far as I know you can't buy consumable tools with such attention to detail. Thanks for the video.

[@captcarlos]

Thank you Rob, Information dense, phew. Deserves a few viewings to glean the most out of it. Little stuff like the screw jack in the grinding vice are obvious, if I thought about it, before my disastrous... Please keep talking to us with these techniques and tips. Carl from Oz

[@steelcannibal]

I just found your channel, I'm loving all of this so much! ❤️

[@humanistwriting5477]

And now I can't look at my hand ground boring bars and think "Boy that looks cherry" anymore. Way to knock my ego down! 😅 Thank you for the videos, moving into a more precise area of industry your tutorials have been a great help getting me to think of precise again, undoing the damage of the last 5 years running sloppy with +/- .002" tolerance and caliper checks being overkill.

[@humanistwriting5477]

I say past five years But the five before that had even more slop.

[@capnthepeafarmer]

"Let's not get carried away here" We've past that sign post long ago.... :)

[@fasousa4798]

Your knowledge on machining subject is amazing

[@MrDanieldarla]

Holy clap, it's patreon time!

[@scottmuller1901]

Very nice work! I enjoy your techniques, learn something every time. I use this most every day as most of my work needs a special tool of some sort. Keep them coming. Thank you!

[@kaiok1777]

I feel like Robin should be working for one of the big machine tooling companies like Sandvik, Iscar, Kennametal, Sumitomo or Horn. Definitely has the skill and know how.

[@druidnoibn7218]

As always, great material, indeed, there is much to learn.... I wish that I could be your apprentice.

[@ROBRENZ]

Thank you very much!

[@Just1GuyMetalworks]

Some very nice tooling 😊. I made some similar ones out of drill rod, turning eccentric, but I just left a bit on the end for a grooving tool and the other an internal threading tool. They work pretty good but yours are on a whole other level 🙂. Beautiful work, love it. 👍😁👍

[@tristanhali8252]

Amazing work mate!

[@ROBRENZ]

Thank you! Cheers!

[@stevemitchell1265]

Love this video. I have had to make special boring bars in my shop and have done all the operations that you performed here except the lapping of the edge (thanks!) I have every fixture and machine that you showed in the video in my shop as well. Just amazing. please do more videos showing making boring bars out of HSS similar to the micro 100 bars that are commercially available. Regardless of cost, such tools are not quickly available when your shop is in the countryside (or on weekends). Thank you

[@acalciu]

Another great video, Rob!

[@wernerberry7800]

Super great teaching Buddy! Lots of goodies in this one! Thanks so much for sharing! 👍💪

[@ROBRENZ]

Glad you enjoyed it

[@stumccabe]

Beautiful work and wonderful attention to detail - thanks.

[@ROBRENZ]

Thank you too!

[@tomjungst1880]

Now you just make me feel lazy! Fantastic to watch!

[@ΓιαννηςΓριζοπουλος-γ9τ]

Respect.... John Grizopoylos retired machinist From Greece

[@ROBRENZ]

Thank you!

[@billdlv]

Great tips Robin, thanks for sharing. Hearing your commentary on making your own bits makes me think I need to spend more time with our Cuttermaster tool grinder.

[@ROBRENZ]

You can do it!

[@bruceanderson9461]

Thank you for another video! Always a treat.

[@ROBRENZ]

Thanks for watching!

[@joshuaklingensmith7843]

Oh yeah Steffen showed that system a while back. Very nice job man.

[@tomeyssen9674]

Wonderful video. Thoroughly enjoyed. Thank you

[@LordOfTamarac]

They call him Mr. Flexure in some parts of town

[@yamasaki.design]

Man, I thought major Tom was good, but your in a different league. Most excellent!

[@ROBRENZ]

Wow, thanks!

[@st3althyone]

Informative as ever Robin, thank you for all your wonderful content!

[@ROBRENZ]

Glad you like them!

[@ianpendlebury3704]

Fascinating - as always.

[@Eartola44]

I find it funny how you often say "we don't need to be super precise" and are still getting things within thousandths of an inch lol, toolmaker's definition of imprecise is different than mine I guess. Keep up the good work.

[@ROBRENZ]

So true!

[@xmachine7003]

Robin you make learning fun. Thank you.

[@mog5858]

thanks for sharing. I always say projets breed projects but I just look at like you explained it's a skill builder.