MAKING AN INSERT BORING BAR

Making new insert heads for carbide shank boring bars. design and execution details are covered in detail. Method for repeatable quick change of multiple parts is shown. Custom D bit cutter creation for the insert pocket.
#practitioner_of_the_mechanical_arts
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[@ThisOldTony]

Brilliant work! I enjoyed that immensely. Keep'em coming!

[@ROBRENZ]

Thanks Tony, that means a lot coming from you! ATB, Robin

[@davearreola6758]

I asked my wife if I could get something from your store for Christmas she said yes 3 👕 yay.

[@Wagamanee]

@@ROBRENZ the front door every five minutes to complete veg food for the rest I've had to be the first time I will send me the messages 😃😃😃😃😃😃😃😃😃😃😃😃😃😃😃😃😃😃😃😃😃😃😃😃😃😃😃😃😃😃😃😃😃😃😃😃😃😃😃 I have to do the needful and send you the best regards and best wishes and thanks again and I am I still need a fact 😂☺️😂☺️😂😂☺️☺️☺️😂😂☺️☺️😂☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️The New school and

[@shawnhuk]

Robin, really great to see you back on YT!

[@rocksolidhugo]

You are not making enough videos but you are making videos with amazing amounts of information and detail. Always a pleasure to spend an hour watching them. Thank you , once again.

[@OldtimeIronman]

Yay! A Robrenz video! It's a real treat to learn from a pro, he always points out details that I would have missed at first glance. Quick, somebody call Stefan!

[@dauber1828]

Like always Robin what a great video please keep them long and thank you

[@anonymousgeorge4321]

There aren't many guys who I would sit through watching an hour and a quarter video with. You're the best.

[@trickengg]

As always, I am blown away at the things learned from your videos. Thank you for sharing this content with us all! You are a WIZARD!

[@ROBRENZ]

Glad to help!

Awesome. Thanks uncle Robin ;)

[@Pappaoh]

You crack me up man, and your vids are top shelf.

[@MF175mp]

When will you make your own Cà Lem?

[@user990077]

Understatement of the year "The quality is much higher then the ones I bought".

[@StefanGotteswinter]

Thanks a lot for this video, I enjoy watching the way you attack certain machining problems a lot. Always something to learn. I am definetly guitly of infeeding from the outside with superabrasive wheels, I have to do a fair bit of reshaping on my wheels to keep them sharp-edged. Should definetly keep your pointer on that topic in mind.

[@ROBRENZ]

Thanks for watching Stefan. ATB, Robin

[@CaskStrength777]

Tool & die guy who works with Viscount 44 a lot. The stuff is available in generic form under drill rod manufacturers by different names, I think we get Precision Marshall Firechrome 44. From what I've been told, actual Viscount 44 is not being made now under original name anymore, but the basic formulation is available under different names for drill rod at least. A. Finkle FX T2 & T3 triple vacuum melt steel is great too- but much harder. Always wanted to make my own insert boring bar- so many are indeed poorly made. Your 0.005" pocket screw offset is what I've been told exactly by a custom small insert tool manufacturer near me who specializes in HSS insert tooling- most people don't know that detail. Guys- if you want to make one of these- he got every minute detail on it. I definitely learned a couple tricks. Would love to see a dedicated vid on the D bit geometry and radial relief grinding. Awesome work Robin, you make quarantine livable

[@ROBRENZ]

Thanks for the kind words and the steel tips

[@EdgePrecision]

Great video Robin! If I can be so bold and make one suggestion. If you mill the bottom of the pocket just slightly larger to leave a small vertical wall that goes about 1/4 to 1/3 the way up your side angle. That would give you a corner relief sort of like your top relief below the cutting edge. This would make it so you don't have to chamfer the bottom corner off those small inserts. Yet still leaves plenty of bearing area for the insert. Thanks again for taking the time making the video.

[@ROBRENZ]

Thanks Peter, I do that on larger insert pockets. I intentionally did not do that on these because the wall on the cutting side is already extremely thin and they have a tendency to just fold over and rip back destroying the pocket integrity. So I wanted all the meat I could get on these. ATB, Robin

[@Idontrunntoofast]

I built my first CNC router in high school, majored in physics, minored in chemistry. Spent 7 years as a Cisco ccnp wireless engineer, built my own cnc machines and started my own welding fabrication and cnc machining business... watched two of your videos and realized I am an idiot.

[@ROBRENZ]

LOL

[@xmachine7003]

😂

[@toddpeterson7316]

Robin, at long last! You have been sorely missed! Thanks for the wonderful content!

[@Jeffen]

Haha i didn't even realize i watched this for over an hour, time flies when you have fun. Thanks for the great content

[@ROBRENZ]

Glad you enjoyed it!

[@toolbox-gua]

I wish I had You as my teacher back in school/college years. Awesome work, again. Thank you for sharing your wisdom.

[@pierresgarage2687]

Hi Robin, Really enjoyed and got lots of good points to improve my work, that hour+ video went by real quickly... As your other well prepared videos...!!! Thanks for the time you spend sharing those fine techniques. ATB, Pierre

[@ROBRENZ]

Thanks Pierre, good to hear from you. Hope all is well with you and your family. ATB, Robin

[@pierresgarage2687]

@@ROBRENZ We're doing fine, hope for the same on your end...!!!!

[@adrianu5481]

Thanks Rob, I learned more from the silver soldering segment than from all the other videos on the subject I have watched.

[@Preso58]

Well, that's the best hour and a quarter of time that I've spent all month. Beats Netflix hands down. Regards, Mark Presling Australia

[@ROBRENZ]

Thanks, that's nice to hear.

[@Gjed16]

Another thoroughgoing post by The Master POTMA. Most questions anticipated, asked and answered. Been postponing my viewing of this one for a while. Sometimes waiting is. 👍💯🧠🏆👏

[@ryanjordan7113]

If your trying to get knowledge drunk Robin is Everclear! 100% baby. I don’t know a smarter individual. Just amazing simple and plain.

[@WrenagadeWorkshop]

Best hour I've ever spent, I was so engrossed, i didn't even realise it was actually that long. Great tips too, all of them were real belters. This episode is going in my favourites for rewatching and referencing. You are an absolute legend Rob, thank you from the bottom of my heart for taking the time and effort to share your astounding knowledge.

[@ROBRENZ]

Thanks for the kind words and glad you enjoy the content.

[@cliffordarrow6557]

Brilliant, superlative content as usual! Thanks for creating!

[@ROBRENZ]

Glad you enjoyed it!

[@christinaedwards5617]

Thank you so much for taking the time to make this video amazing work robin as always

[@ROBRENZ]

Glad you enjoyed it!

[@sierraspecialtyauto7049]

A tremendous amount of information...something here to benefit almost any machining job. Thanks for taking the time to share.

[@josemorales-er5eh]

Thats the longest how to video Ive watched no regrets learned a lot from it.Thank you very much professor.

[@ROBRENZ]

Glad to hear that

[@glennstasse5698]

I don’t t do any metal machining. I come for the inspiration and Robin never lets us down. Never! Exquisite workmanship. Thanks as always...

[@ROBRENZ]

Wow, thank you!

[@KamiCrit]

Oh my goodness, all that in six hours! It would take me six hours to decide which broken boring bar I should use.

[@azenginerd9498]

I use reference sketch geometry to "do the math" often - a very underused technique. A joy to see you present it.

[@mhc6777]

Great video full of detail and explanation - now I know what other KZbin machinists mean when they say "The full Renzetti".

[@SecretaryBootyyJuice]

So... I think, one of the best, most informative videos on KZbin. This entire video is solid GOLD! You have a new subscriber, a new follower, and as soon as I can make up that lost Covid time, a new patreon! I’m just, I’m blown away by the sheer knowledge, and the beautiful willingness to share it! A lot of the old school guys I grew up with wouldn’t give you a nickel to rub together to try and learn this. Thank you! I learned enough to in this video to decide that I’m going back to school to finish!

[@ROBRENZ]

Thanks, this makes my day!

[@sblack48]

This is insanely great. These videos should be an accredited masterclass in tool making. I wish there were more but this must have taken many hrs to put together. While it is long, the density of knowledge in this is staggering. I will watch it many times. In the words of Wayne and Garth, we’re not worthy!!! Oh and please do a vid on your rotor head, pleeeeeeeeease. ATB

[@ROBRENZ]

Thanks, and the rotor head is on the long list

[@b2dmastersniper]

After watching youtube machinists for literally a decade and learning a massive amount, I am very happy to have found another channel where I cant completely predict the whole project start to finish, I learned more in the last hour than I have in the last month. Awesome channel, I have alot to catch up on.

[@PhilsProjects]

Another master class in how to do it correctly, Thanks Robin, be safe

[@ROBRENZ]

Thanks Phil, you too!

[@JamesChurchill3]

I can't get over how quick you are with changing parts in the lathe, those collet stops and expanders sure make a difference!

[@HanstheTraffer]

I just started learning some machining. Doing what is necessary to make the things I need. What a difference there is between someone who knows what they are doing and a cave man newbie like me. Thanks for sharing your expertise. It is an absolute privilege to watch you sir!

[@outsidescrewball]

thank you for all of your time/discussion/filming....I was so intrigued watching that my coffee got cold...awesome video!

[@ROBRENZ]

Glad you enjoyed it Chuck! ATB, Robin

[@JlerchTampa]

When you reach the last word of the last page of a very good book, and then you flip to the first word on the first page and thoroughly enjoy re-reading the story. Occasionally the second reading is even better than the first. This video is just like that, I very much enjoyed it and all the little gold nuggets of wisdom and experience you shared! Thank you!

[@ROBRENZ]

Love that!

[@bones357]

I don't know how to fully express just how exciting it is to watch this master toolmaker go through the full tool making process. I watch these videos intently and intensely, with real reverence. I mean it, if folks don't know just how how much time, dedication, and just pure talent is involved in a trade like this, well, know you know!👊👍😊

[@ROBRENZ]

Thanks for the very kind words

[@glennfelpel9785]

I am highly impressed by your SolidWorks knowledge and ability. Your In context modeling the use of multiple design sketches within parts and assemblies shows you have a deep understanding of the software. I have been modeling in SW for over 20 years but we mostly do injection molded part design. Keep up the good work. The in context modeling is one of the most demanding SW skills...any little glitch will sink a whole model. I Keep working backup progress files in safe keeping until the very end. Thank you for the video

[@ROBRENZ]

Thanks Glenn, I have been using SW since the beginning but I an no expert. I use it only about 5-10% of my time as I usually manufacture what I design. Your right that in context can get you in big trouble fast.

[@bugrobotics]

Efficiency is a beautiful thing. Thanks as always for sharing!

[@kglesq1]

Way beyond my skill level, but fascinating to watch. I always really enjoy your content. Thank you.

[@davidmurray700]

Thank you Robin for taking the time to share the knowledge. Always love seeing your thought process, almost more than the tips & tricks during machining. Take care, & ill be right here when the vid comes.

[@KDMEDIC]

As a Utility man (universal shop work and industrial repair) i enjoyed watching your video. Thx for taking the time to make it. You are a Master. Thank you.

[@liamlevins6570]

Wow! this man is the Da Vinci of the 21st century's machine world

[@RGSABloke]

Robin, the most expensive boring bars on plant earth but ten times the value of what’s mostly available. Yet another master class, Tom Lipton on steroids level. One of the most enjoyable parts of your videos is the thoughtful planning and meticulous attention to detail. Also, this must have taken ‘an age’ to stitch this video together. The production values are amazing. I think even ‘This Old Tony’ would would be awarding you top marks for this masterpiece. Thank you so much for all your efforts. Most sincerely. Kindest regards from Bonnie Scotland. Joe. PS stay safe and well👍😎

[@ROBRENZ]

Thanks and same to you!

[@robertwatsonbath]

Thanks Robin, I'm sure we all appreciate the extra time required to make the video alongside. Six to seven hours of work time? Wow, I'd probably be still milling the hex at that point, haha. Very much enjoyed :)

[@shawnlund]

You certainly set the bar high for everyone else. Nicely done and really enjoyable to watch.

[@zacjust752]

Excellent work, I especially appreciate how you explain your workflow in designing the part. I also like your explanation of steps and the reasoning behind it. I learn a ton of little things most people would skip over.

[@ROBRENZ]

Glad it was helpful!

[@SolidRockMachineShopInc]

Great to see another video Robin! Steve

[@Engineerd3d]

Always learn from you. This is better than classroom time. Enjoyed every minute of this.

[@0verboosted]

Robin I watch a lot of machining channels on KZbin; no one makes tools with the detail that you do. Well, maybe Tom Lipton ;) Glad to see another a video after a hiatus!

[@ROBRENZ]

Wow, thanks!

[@bobvines00]

I put Robin, Tom, & Stefan in the same, very small group of Machinists that want to share & teach their skills with the world of Machinists, while working to much higher standards than most work to.

[@eliduttman315]

@@bobvines00 Can you imagine the SCARY stuff that would get made, if all 3 were in 1 shop at the same time? Cream rises!

[@st3althyone]

Such a wonderful time watching you work Robin. As always, you make learning so much fun!

[@ROBRENZ]

Thank you so much!

[@chrissollazzo6835]

If only I had a shop teacher 40ish years ago like yourself when I began my machinist career. I had to break alot of tools, and an occasional g-code crash 😩, to learn one fifth the information you pass along in these video. I sincerely appreciate your efforts making these videos and you sharing your expertise and experience.

[@crazytrutas]

Absolute machine Porn! Thank you for taking the the time to film this all. Great work.

[@steveparker8723]

I'm not a machinist but I worked in a shop that had several machine shops for both die and tool making. Love watching the journey you take when making things. You explain and show the how and why very well.

[@rexmundi8154]

That is some very clever modeling. Like a lot of old machinists, I never got any Solidworks training in design. Moving from manual machining to CAD / CAM / CNC was a big move for me. Of course most of us had some exposure to programmable DROs and conversational programming like Prototrak and Dynapath, but making stuff work in Solidworks was a steep hill to climb. It’s frustrating when you know what you need to do and you can’t figure out how to make Solidworks do it. At least I have my Machinery Handbook to fall back on. Learning how to use that was probably as hard as Solidworks if I’m being honest. But I was younger then and my eyes were better.

[@Ideasite]

Unbelievable creativity & skill! You are an inspiration. Thank you! Please continue the cause for the army of people like me who gain giant steps with each video.

[@davesalzer3220]

It’s always a treat to see a video from you. Thanks.

[@ROBRENZ]

My pleasure!

[@arnljotseem8794]

As a hobby machinist I am blown away by your videos, and that is to be expected. You are of course on another level. However, there is so many things to learn from these videos, so if I can pick up only one or two things from each viewing I can greatly improve my skills video by video. You and Stefan are my favorite tutors in my machining venture. Thank you for taking the time.

[@ROBRENZ]

Thank you Arnljot!

[@stumccabe]

Thank you Rob - beautiful work, wonderful attention to detail. I certainly learned a couple of things.

[@edissmajic]

It's been a while since I watched something longer than 30 minutes. Well worth it... Excellent content and craftsmanship.

[@ROBRENZ]

Thank you.

[@euclidallglorytotheloglady5500]

The walls for the insert are just beautiful! Wonderful work!

[@bruceanderson9461]

One thing I have learned over the years is to take the time to consider all of the ways to do a machining operation before making a decision on which to use. My son and I used to make a game of how many ways we could do something before actually doing it. This goes right along with your advise to always consider future steps before rushing in to get the present step done. Both of this can result in some real revelations on how best to proceed. Thank you again for the great video as I know how much extra time it takes to video it.

[@gregghooper]

You are the Master! Thank you for sharing

[@shimmerite_ua]

Thank you very much for this excellent video! I've used this brazing method with a solder feed hole with great success, very convenient and clean

[@James-fs4rn]

👍 anything you make is better than can be purchased! Thanks for sharing another Robin. I cling to every word you have to say and appreciate the lessons. Stay safe and well my friend!

[@ROBRENZ]

Wow, thank you!

[@lepompier132]

It's always nice to know. I've seen twice the need to do an insert tool inhouse for a specific job where I used to work. Niice job!

[@bcbloc02]

I was 30 minutes into this video before I realized how small these boring heads were, I feel bad because I had plainly seen the blueprint at the beginning. I guess that is what happens when you work with big stuff all the time you forget about the small ones. I have never used a boring bar that small.

[@ROBRENZ]

Thanks for stopping by Brian. These could be very useful in your big Monarch ;-) ATB, Robin

[@jtkilroy]

I'd misplace a boring bar that size, in the chip pan

[@forrestaddy9644]

One of my old mentors taught me the ins and outs of a splendid little instrument lathe in the chonometer shop. He told me that liittle parts are no different from big parts except they're little. If that remark didn't puzzle a third year apprenticei he had a fund of others just as elliptical.

[@userwl2850]

I'm super impressed. Watched the full video without skipping. Top work. 👏🏻👏🏻👍

[@ROBRENZ]

Awesome! Thank you!

[@robertpoirier5157]

Thank you very much for sharing your knowledge Rob!

[@glennedward2201]

Started making my own tooling over the past year. I’ve found it’s easy to make a better indexable holder myself than what’s available to purchase.

[@Vikingman2024]

You are in a completely different league! Absolutely incredible!!!!

[@ROBRENZ]

Wow, thank you!

[@phillipyannone3195]

Absolutely fabulous video and superb results. Thank you for sharing your lifetime of experience.

[@ROBRENZ]

Glad you enjoyed it!

[@stefanhertweck]

Great content, thx for sharing. A few years back I also made a tool holder for DCMT and VCMT carbide inserts and used my D-bit grinder so that I could mill out the 7° relief angle. A good CAD/CAM package and CNC mill ease the process of milling out required contours. This approach opens up further possibilities to fulfill those kind of special jobs :)

[@druidnoibn7218]

Hi Robin, Great work as always - we need to see more of you...HINT...

[@WideAwakeHuman]

Holy moly... Thought I was gonna see a run of the mill video but this was on another level... Very nice

[@ROBRENZ]

Glad you liked it!

[@MegaCountach]

Aces Robin! Thanks for your time in making this, cheers, Doug

[@Ryan-dz3jo]

Thanks Robin, I am privileged to look over your shoulder to listen and learn. Thanks for sharing your time, very much appreciated.

[@ROBRENZ]

You are very welcome

[@jeremydoblinger3609]

beautiful job on these boring bars and i can see the enjoyment factor over the years of using these ..thanks

[@54hmmwv]

2nd time I've watched this. I always learn something new with you. Thank you for your time and sharing your knowledge!

[@ROBRENZ]

Glad it was helpful!

[@alexanderhowa9707]

Great video. I didn’t know they had indexable bars this small.

[@durangotang1681]

One of the most chronically under-subbed You-Tubers of all time is back with a boring video 😉. I did some “insanity level” hand scraping recently. Decided I’d never do it again.........without magnification and high spot blue.

[@johnspargo5876]

Thank you Robin - my favourite "practioner" kind regards from John Spargo in a locked down Cape Town

[@matts8023]

Beautiful. Extremely educational, thank you for all the effort to edit and present in such an approachable way!

[@ROBRENZ]

Glad you enjoyed it!

[@bob_mllr]

Great video Robin. I feel like I just spent the day in your shop learning. Thanks for being so generous.

[@ROBRENZ]

Any time!

[@TroubledTimes2024]

Not my 1st time to watch this and am impressed once again.

[@tonyray4203]

Thanks for another unique video Robin. So much to take in !

[@cschwad559]

It’s good to see someone using a spot drill instead of a center drill for spotting operations.

[@warrenjones744]

Great video Robin. I may never need to build one of those, but the procedure and sequence lesson was worth a million as they say. That set screw mount will stick in my mind now.

[@akfarmboy49]

Really good information Learned at least 6 things I need to look into a D grinder Thank you

[@ROBRENZ]

Glad it was helpful!

[@brucewilliams6292]

Very thoughtful video. I appreciate your letting us into your process. Thank you.

[@jenniferwhitewolf3784]

Nice to see some of the other big you-tubers actually watching here. I really appreciate the precision and attention to detail.

[@Make-Asylums-Great-Again]

Where are they?

[@StuartdeHaro]

Very cool video as always. You really make me wish I had room for one of those grinders.

[@noneofabove5586]

You skills and attention to detail alway amazes me. Thank you !

[@bcwrangler]

Fantastic job on the video and the bars Robin....Thank you!

[@reinierwelgemoed8171]

Absolutely loved it. You are a next level master Yoda machinist. I learn so much from You.

[@captcarlos]

Magnificent, beautiful work done there Rob, enjoyed every minute. I will have to watch it a few times, as usual, to get the most out of your lesson. If you were contemplating manufacturing a run of those bars..... Hmmm Keep safe.

[@michaelpiotrowicz6100]

Thanks, it is remarkable that a video of this length contained no filler. Unless perhaps you count the silver solder itself :)

[@ROBRENZ]

LOL Watching videos that don't respect my time frustrate me. So I do my best to make every second count on my videos which takes a lot of editing.

[@torerlendfgri2514]

Excellence in presentation, execution and education. Thank you!

[@ROBRENZ]

Glad you enjoyed it!