Best explanation of centering drills & spotting drills I've ever come across- few in American machining know or care about these differences- but the skilled people do, because it does matter. What Stefan calls "chisel point" is called the drill web in America- its only on standard drills, and he's right- it smashes metal away, it doesn't have cutting geometry. Split point drills get rid or the web- which is why they cut with less pressure and more accurately. Imho, the single edge 120 degree "D" drill is the most accurate type of starter drill- exactly because of what he describes, its basically a single edge cutter, closest to a single point cutter, which is most accurate. Knowing these differences is what makes a real machinist 👍 Great video.
Watching this in 2022.... it's so clear how much more comfortable you're with English these days :) It wasn't bad at all even way back then, but clearly you've improved a lot :)
Hi mate. Yes you are a teacher. I recon a teacher is someone that has knowledge that an other has not. You are very willing and capable in sharing your knowledge, therefore you are a teacher. Well done mate
Your short "non-teaching" videos often convey more information clearly that whole semesters that I took for "professional teachers". Thanks & keep them coming as often as you like.
As many have already said Stefan, you do great work, and you also have the gift of passing on your knowledge and wisdom, for which we are most grateful. Thank you and please keep them coming as time allows you to compile the videos. The video quality as well as the content is top quality. Rob
These short tutorials are wonderful, Stefan! You have the knack to explain the subtleties of processes in a way that is direct and clear. Doc McCain taught machining and metalworking for many years in the industrial arts department at the university I attended. He would sometimes stop everyone from what they were doing and tell everyone to "gather around", then he would give a short tutorial on the proper technique or details of an operation that you wouldn't learn in a book. This video reminded me of him. So, yes, keep doing the Gather Around videos.
Many thanks for sharing your knowledge. Most if not all of us can still learn from another persons dedication to their trade. Thumbs up for any video you put out Stefan. regards from the UK
Hi Stefan. Top man, your attention to detail, and your passion for what you do, makes good teaching and enjoyable watching. What ever the age group watching this, will learn something on that i'am sure. Me being a retired tutor, I tell you you've got it. Keep the vids coming, on any subject you want. Regards Tony
thank god finally someone made a video about this topic! i always cringe, when other youtube machinists spot every hole with the 60° spotting drill. where i worked we always center drilled with a 90° center drill but added the chamfer for the thread or the hole with the spotting drill beforehand. thats another topic to make a video about. always chamfer your threaded or reamed holes before you thread/ream. in germany every apprentice learns it this way but on youtube nobody does it. pretty weird in my opinion. great video! :)
Being a teacher should be a calling... so please listen to all the voices... you my friend have been chosen! Keep up the awesome work and keep sharing your knowledge... I learned so much already and I promise not to stop as long as you don't! Keep it coming... you are adding to the collective knowledge of mankind with every single video you do... trust us. :)
Hi Stefan, First video I have seen which explains the use of center drills and spotting drills and you have done it very well. You make it so understandable and complete. The use of your T&C grinder to make other tools (engraving, spotting etc) is an added benefit. Keep it up. Bob
I benefit greatly from you videos and enjoy your style as well. These shorter videos are very nice and offer me what I want most, instruction and demonstration on "how to do". You do it very well indeed.
This kind of video is invaluable to the non pro machinist. I never even thought about the mechanics of the spotting operation but it makes perfect sense now! There is too much marketing and super materials to sift through when learning now. These fundamentals get lost in the shuffle thanks for sharing your knowledge.
Yes please, despite my age (83) one needs education and being brought up to date. Additionally your excellent patient explanations give time to understand things more fully. Thanks - just back from Hamburg and Flensburg having been with the old steam boats, round harbours and up the Elbe with also some model engineering exhibitions. Cheers.
I learned this when I first started out my mentor who was an engineer type explained it just like you did :) this is one of the reasons why I really like your channel
Excellent vid, Stefan! Although nearly everyone uses a centre drill to start a whole, it should really only be used for inserting a centre. Using the very tip is ok, but it should be said that the diameter of the tip should be at least 70% of the drill diameter which follows it, to make it effective! My vote is for the 120° spotting drill. Thanks again for being willing to share your knowledge! Vielen Dank, mein Herr! Schöne Grüße aus Südafrika!😊
Every day is a school day Stefan! You're never too old to learn something and eh, if I already know it I can hit the 'move to the next video' button so keep em coming!!
I would very much like to see more videos like these! I never had the opportunity to learn machining in trade school, I am a Master Plumber, so anything I can learn about basic machining is GREAT! Thanx, Gerry
I always used centerdrills, that was the way I was taught to do it. Seeing this video has changed my mind. Now I also understand why drillbits wobble arround the centerdrilled hole, You see that often here in other videos. Top Lipton used a 38 mm drill to bore out and he started the centerhole with a centerdrill. You see the big fat drill wobbeling arround before it settled down. Stephan has shown in this video that a little difference of just 2 degrees actualy makes a very big difference! Thank you.
worth mentioning that the traditional lathe centre drill is designed to drill centre holes for the tailstock centre , the point before the 60 degree taper is to give relief so the tailstock centre does not end up supporting the work on the very end of the point.
You sell yourself short as a teacher. I learn more from this single channel about practical and the practice of machining than anybody else. RobRenz for the discussions of nanometer accuracy and everything is rubber, and dreaming about making high-precision parts, TOT for the belly laughs and kittens, and Stefan for the thinking man jokes and the graphs and charts and fine details on lots of the steps. Don't change your process or sell yourself short. I also realize this is an older video, but I learn something from all of them.
Your videos are always interesting AND educational, even if you'd prefer not to claim it for yourself. Even if there is a subject I feel I know plenty about I am not one to think that there is nothing more to learn. Learning is one of my all-time favorite things in life. Thank you very much and have a good week at work, Aloha...Farmer Chuck
Many years ago I learned some lessons from seasoned machinists in a production shop that knew much more than I did about the proper way to start and drill holes accurately and efficiently. Since then I have always done it this way and have always had great success. I use 135 degree point stub (screw machine) drills every time for starting and drilling holes. The sizes that are not too small are short enough to maintain rigidity for positional accuracy when chucked properly and usually long enough to drill to the required depth as long as the part is not thicker than the drill flutes are exposed. There is no need to predrill holes with a spotter or center drill (if the drill is perpendicular to the surface of the part), since the stub drill IS the spotter, and it saves much time when there are a lot to do.
Stefan, just sharing your knowledge and expertise is teaching and you are a very good one at that. thank you for the videos and for sharing what you know. also you are getting close to 10K subscribers!
Thank you for the comparison and clarification of a variety of tools used to locate a position on a piece of material. Nothing is as simple as it seems.
Excellent video, Stefan, and I like the tutorial format. You have shown what I have been suggesting, the use of a starter drill with a larger included angle than the drill which will follow it. That also includes using a 140 degree starter bit for starting 135 degree drills. I have mostly gone even beyond that, to using 135 degree, split point, screw machine (stub) length drill bits. Now we have the small point, the short length, and the rigid shank so we can often just drill the hole without using a starter drill at all, especially if the surface is relatively smooth and at 90 degrees to the drill. The time savings can be quite significant, with no apparent loss of accuracy...
Thank you for sharing your thoughts on how and why, they do make you a teacher and it is greatly appreciated. I would like to see anything you wish to produce as I know it would be informative.
I like these Videos, because you explain why I am not getting the results I would like using the tools I am using. Very well presented and well explained. I knew I should be doing something different just wasn't smart enough to figure it out for myself. Thank you. Tom
Hi Stefan,I find such videos very instructive as you put them over in such an interesting and informative way, Good to mix in with project subjects. Regards, Ted.
Another great video! Tooling and use always interesting. Doing the mixture of projects to tips videos that feed your passion will feed ours too. Especially love your tooling projects. Thanks! M'Gillikeyr
Very useful video Stefan. Thank you! There are no comprehensive TH-cam tutorials devoted to using the Chinese type single lip cutter grinders. It would be really helpful to give your viewers an explanation of how to make the various angular adjustments using the machine's controls. I know you touch on this here and in some of your other videos but a more introductory approach to the adjustments might be helpful. Would also be good to have your thoughts on what modifications/accessories can be made in the home shop to make these single lip grinders more versatile for sharpening conventional cutting tools, end mills etc. I enjoy all your videos Stefan. Ramsay
Yes! Also how to sharpen and modify drills with web thinning, point splitting, extra relief angles... That grinder can do a lot of stuff! Regular twist drills can be made high performance!
your videos are always have great content i say keep doing it the way you are now what ever you want to share i am sure will be pleasing to everyone, and thank you for sharing
I have been center-drilling for about 15 years now and now I realize that I didn't know anything about it. Thank you for this video, and by all means give us more "technique" videos when you feel like it. I was well acquainted with D-bits, made a few myself, mostly reamers. Never occured to me to make a spotting drill (or NC-Anbohrer if you prefer) out of them. Another thing I learned is that a tool and cutter grinder is an extremely useful tool. I certainly couldn't do that freehand. Have to look into that.
People thought I was crazy for wanting a 120 degree spotting drill over a plain centre drill. This feels like a vindication. Thanks for sharing! :) BTW: These videos full of tips are fantastic!
Best explanation of centering drills & spotting drills I've ever come across- few in American machining know or care about these differences- but the skilled people do, because it does matter.
What Stefan calls "chisel point" is called the drill web in America- its only on standard drills, and he's right- it smashes metal away, it doesn't have cutting geometry. Split point drills get rid or the web- which is why they cut with less pressure and more accurately.
Imho, the single edge 120 degree "D" drill is the most accurate type of starter drill- exactly because of what he describes, its basically a single edge cutter, closest to a single point cutter, which is most accurate.
Knowing these differences is what makes a real machinist 👍 Great video.
Keep this type of video coming as often as you feel like sharing your knowledge with us.
I agree with Dale.
There is always something to learn.
Any time you would like to show a different way to do something, please do so.
Thanks,
John
Totally agree!! Can't ever have enough knowledge, the more you know the easier you sleep😂😂 love people sharing their knowledge!!
Watching this in 2022.... it's so clear how much more comfortable you're with English these days :)
It wasn't bad at all even way back then, but clearly you've improved a lot :)
"SG CAD" I love it! good video. I like your thorough explanations.
Hi mate. Yes you are a teacher. I recon a teacher is someone that has knowledge that an other has not. You are very willing and capable in sharing your knowledge, therefore you are a teacher. Well done mate
Whether you like it or not you are by definition a teacher. Keep this sort of video coming, there are many who will benefit from your insights.
Your short "non-teaching" videos often convey more information clearly that whole semesters that I took for "professional teachers". Thanks & keep them coming as often as you like.
Ah, Stefan: anyone who shows how things are done is a teacher - I appreciate everything I have learned from you through your videos!
As many have already said Stefan, you do great work, and you also have the gift of passing on your knowledge and wisdom, for which we are most grateful. Thank you and please keep them coming as time allows you to compile the videos. The video quality as well as the content is top quality.
Rob
These short tutorials are wonderful, Stefan! You have the knack to explain the subtleties of processes in a way that is direct and clear.
Doc McCain taught machining and metalworking for many years in the industrial arts department at the university I attended. He would sometimes stop everyone from what they were doing and tell everyone to "gather around", then he would give a short tutorial on the proper technique or details of an operation that you wouldn't learn in a book. This video reminded me of him.
So, yes, keep doing the Gather Around videos.
Love this kind of video. Projects are great, but this kind really helps flesh out the details. Don't stop either.
Many thanks for sharing your knowledge. Most if not all of us can still learn from another persons dedication to their trade. Thumbs up for any video you put out Stefan. regards from the UK
Stefan you always give a precise explanation enjoy all your videos bud. Just keep doing what you are doing. Take care lee
Hi Stefan. Top man, your attention to detail, and your passion for what you do, makes good teaching and enjoyable watching. What ever the age group watching this, will learn something on that i'am sure. Me being a retired tutor, I tell you you've got it. Keep the vids coming, on any subject you want. Regards Tony
thank god finally someone made a video about this topic! i always cringe, when other youtube machinists spot every hole with the 60° spotting drill.
where i worked we always center drilled with a 90° center drill but added the chamfer for the thread or the hole with the spotting drill beforehand.
thats another topic to make a video about. always chamfer your threaded or reamed holes before you thread/ream. in germany every apprentice learns it this way but on youtube nobody does it. pretty weird in my opinion.
great video! :)
Being a teacher should be a calling... so please listen to all the voices... you my friend have been chosen! Keep up the awesome work and keep sharing your knowledge... I learned so much already and I promise not to stop as long as you don't! Keep it coming... you are adding to the collective knowledge of mankind with every single video you do... trust us. :)
He Stefan, Mechanical Engineering student from Holland here! I really enjoy watching your videos. I can really appreciatie your attention for detail!
Hi Stefan,
First video I have seen which explains the use of center drills and spotting drills and you have done it very well. You make it so understandable and complete. The use of your T&C grinder to make other tools (engraving, spotting etc) is an added benefit. Keep it up.
Bob
I appreciate these short 'tips and tricks' videos. Thank you for all of your effort!
Excellent video. I particularly appreciate your effort to (successfully) measure your words for consistency and clarity of the concept.
I benefit greatly from you videos and enjoy your style as well. These shorter videos are very nice and offer me what I want most, instruction and demonstration on "how to do". You do it very well indeed.
This kind of video is invaluable to the non pro machinist. I never even thought about the mechanics of the spotting operation but it makes perfect sense now! There is too much marketing and super materials to sift through when learning now. These fundamentals get lost in the shuffle thanks for sharing your knowledge.
very interesting video, I would love to see more of these, there is always something to learn about machining. Thank you for sharing!
Yes please, despite my age (83) one needs education and being brought up to date. Additionally your excellent patient explanations give time to understand things more fully. Thanks - just back from Hamburg and Flensburg having been with
the old steam boats, round harbours and up the Elbe with also some model engineering exhibitions. Cheers.
Very good info Stefan you post some of the best machining videos on TH-cam!! Keep them coming to us.
I learned this when I first started out my mentor who was an engineer type explained it just like you did :) this is one of the reasons why I really like your channel
Honestly Stephan, I watch a lot of machinists videos on TH-cam but yours are my favorite. I will watch whatever you produce.
Excellent vid, Stefan! Although nearly everyone uses a centre drill to start a whole, it should really only be used for inserting a centre. Using the very tip is ok, but it should be said that the diameter of the tip should be at least 70% of the drill diameter which follows it, to make it effective! My vote is for the 120° spotting drill.
Thanks again for being willing to share your knowledge!
Vielen Dank, mein Herr! Schöne Grüße aus Südafrika!😊
Every day is a school day Stefan! You're never too old to learn something and eh, if I already know it I can hit the 'move to the next video' button so keep em coming!!
I would very much like to see more videos like these! I never had the opportunity to learn machining in trade school, I am a Master Plumber, so anything I can learn about basic machining is GREAT! Thanx, Gerry
I always used centerdrills, that was the way I was taught to do it. Seeing this video has changed my mind. Now I also understand why drillbits wobble arround the centerdrilled hole, You see that often here in other videos. Top Lipton used a 38 mm drill to bore out and he started the centerhole with a centerdrill. You see the big fat drill wobbeling arround before it settled down. Stephan has shown in this video that a little difference of just 2 degrees actualy makes a very big difference! Thank you.
Hi Stefan, I enjoyed this video a lot. Very good subject matter and the actual grinding procedure, you make it look easy. thanks
worth mentioning that the traditional lathe centre drill is designed to drill centre holes for the tailstock centre , the point before the 60 degree taper is to give relief so the tailstock centre does not end up supporting the work on the very end of the point.
Yes. That is about the only reason for the 60 degree starter. imho......
Yes Stefan, more video's like this would be greatly appreciated...! Cheers and thanks...!
You sell yourself short as a teacher. I learn more from this single channel about practical and the practice of machining than anybody else. RobRenz for the discussions of nanometer accuracy and everything is rubber, and dreaming about making high-precision parts, TOT for the belly laughs and kittens, and Stefan for the thinking man jokes and the graphs and charts and fine details on lots of the steps. Don't change your process or sell yourself short. I also realize this is an older video, but I learn something from all of them.
Thank you a lot!
Your videos are always interesting AND educational, even if you'd prefer not to claim it for yourself. Even if there is a subject I feel I know plenty about I am not one to think that there is nothing more to learn. Learning is one of my all-time favorite things in life. Thank you very much and have a good week at work, Aloha...Farmer Chuck
I love your videos! Thanks for sharing your knowledge with us Stefan!
Many years ago I learned some lessons from seasoned machinists in a production shop that knew much more than I did about the proper way to start and drill holes accurately and efficiently. Since then I have always done it this way and have always had great success.
I use 135 degree point stub (screw machine) drills every time for starting and drilling holes. The sizes that are not too small are short enough to maintain rigidity for positional accuracy when chucked properly and usually long enough to drill to the required depth as long as the part is not thicker than the drill flutes are exposed. There is no need to predrill holes with a spotter or center drill (if the drill is perpendicular to the surface of the part), since the stub drill IS the spotter, and it saves much time when there are a lot to do.
This was 200% of what I was looking for! Perfect format.
best center drill and grinding video on the www. yes please more of this style.
Very good common sense instruction. Never thought about center drills like this before. Thanks for your efforts!
Yes please.. more tutorials/tips-n-tircks regardless of the time length. Thanks Stefan
I had no idea that i was center drilling wrong, the D-Bit grinder is an epic tool, now i see why all my favourite channels have them, so useful 👍👌🇦🇺
Thanks for this video. You impart your knowledge in a clear and straightforward manner. Please continue.
Stefan, just sharing your knowledge and expertise is teaching and you are a very good one at that. thank you for the videos and for sharing what you know. also you are getting close to 10K subscribers!
Thank you for the comparison and clarification of a variety of tools used to locate a position on a piece of material. Nothing is as simple as it seems.
Excellent video, Stefan, and I like the tutorial format. You have shown what I have been suggesting, the use of a starter drill with a larger included angle than the drill which will follow it. That also includes using a 140 degree starter bit for starting 135 degree drills. I have mostly gone even beyond that, to using 135 degree, split point, screw machine (stub) length drill bits. Now we have the small point, the short length, and the rigid shank so we can often just drill the hole without using a starter drill at all, especially if the surface is relatively smooth and at 90 degrees to the drill. The time savings can be quite significant, with no apparent loss of accuracy...
Good video! Keep them coming. The drill angles never crossed my mind till I saw this. thank you!
Best Matt
Excellent points Stefan - great reminder, and examples.
Love your grinder - need one of those. Must make me a D bit but have to do by hand - somehow!
Keep them coming Stefan. They are very interesting and useful. Thanks
really outstanding video. I like projects a lot, but these informative tips are wonderful also!!!
Keep em coming. I always learn something new when i watch your videos.
Thanks for sharing your knowledge and expertise with us. Great video!
Thanks! Very informative, this should improve my accuracy greatly. Yes please share your learned tricks and also your projects.
Thank you for sharing your thoughts on how and why, they do make you a teacher and it is greatly appreciated. I would like to see anything you wish to produce as I know it would be informative.
Please more of your tips and methods - I find your methods easily understood to apply and does improve my abilities. Thanks
Hi Stefan, Eventhough I like your project video's very much, I also like these shorter "how and why" video's. Great info and a pleasant format.
Excellent video. As always, I learnt something.
I like these Videos, because you explain why I am not getting the results I would like using the tools I am using. Very well presented and well explained. I knew I should be doing something different just wasn't smart enough to figure it out for myself. Thank you. Tom
Very informative little video !
Please keep them coming !
I love these tips and tricks videos. I need all the help I can get.
Very informative and instructive. I shall try this. Thanks. More videos like this please!
Thanks Stefan love this kind of content as it helps with all my work wish other guys on youtube went this way.regards Jeff.
Thanks for sharing Stefan, had those in my tool box and did not know what they were.
Awesome video - please keep making them. Much thanks!
Great explanation, sir!!
Keep-em coming, please
Thanks for sharing
Hi Stefan,I find such videos very instructive as you put them over in such an interesting and informative way, Good to mix in with project subjects. Regards, Ted.
thankyou stefan. very useful video on a subject that can be controversial.. much apreciated
Yep! Project based vidz are great! But knowledge sharing vidz, are what we need to make our own projects! Keep them coming Stefan...
Excellent video! Please keep this type video coming! Much appreciated!
I enjoy your tutorial videos. There is a lot of holes in my training.
Thanks
love that grinder! you have some awesome tools in Germany!. and they look old school cool !
Very interesting, great info. Very nicely done.
I enjoy video's like this Stefan, I learn a lot, thank you.
Excellent video with superb explanation.
I love these tips. I didn't know a few things in this one.
That was excellent Stefan. PLEASE do some more techique-orials - Now I want a tool grinder too. Those d-bit starters work extremely well!
Good instructional video. Your workmanship is excellent :)
Another great video! Tooling and use always interesting. Doing the mixture of projects to tips videos that feed your passion will feed ours too. Especially love your tooling projects. Thanks! M'Gillikeyr
I'd like to see you sharpen a twist drill on that grinder.
yes, me too.. thx
Very useful video Stefan. Thank you!
There are no comprehensive TH-cam tutorials devoted to using the Chinese type single lip cutter grinders. It would be really helpful to give your viewers an explanation of how to make the various angular adjustments using the machine's controls. I know you touch on this here and in some of your other videos but a more introductory approach to the adjustments might be helpful. Would also be good to have your thoughts on what modifications/accessories can be made in the home shop to make these single lip grinders more versatile for sharpening conventional cutting tools, end mills etc. I enjoy all your videos Stefan.
Ramsay
..Every video is a treat...and a thumbs up!
Thanks Stefan, More tips would be great please! Love your work. Many thanks for sharing :-)
Yes! Also how to sharpen and modify drills with web thinning, point splitting, extra relief angles... That grinder can do a lot of stuff! Regular twist drills can be made high performance!
Tips and Techniques are a great way for us newbies to learn.
your videos are always have great content i say keep doing it the way you are now what ever you want to share i am sure will be pleasing to everyone, and thank you for sharing
I agree with the feedback so far Stefan, videos of this type are very welcome. They're both interesting as well as informative/educational.
I have been center-drilling for about 15 years now and now I realize that I didn't know anything about it. Thank you for this video, and by all means give us more "technique" videos when you feel like it. I was well acquainted with D-bits, made a few myself, mostly reamers. Never occured to me to make a spotting drill (or NC-Anbohrer if you prefer) out of them. Another thing I learned is that a tool and cutter grinder is an extremely useful tool. I certainly couldn't do that freehand. Have to look into that.
Oh yes, the SGCAD drawings were priceless, that's when I undestood what was happening.
thanks for sharing this valuable knowledge; more of these would be well received....nice job.
Stefan, very enlightening video. I have a tool and cutter grinder and really don't know how to use it. More on that would be great. Thanks
Excellent video as always!
Very helpful information Stefan. Thank you
very insightful information, thank you for sharing and yes please more videos like this!
Thank you it was very interesting and educational for me as a newby hobby machinist
Both projects and tutorials are best.
People thought I was crazy for wanting a 120 degree spotting drill over a plain centre drill. This feels like a vindication. Thanks for sharing! :)
BTW: These videos full of tips are fantastic!
Very nice Stefan! Keep them coming.
I Love it. Learned a lot with this video.
As many of these as you like. Whether you think it or not you are a freak teacher. Thanks.
"Tricks whit tools" Very nicely done !