I never "needed" a surface grinder until I watched this video. Good stuff!

wonderful build, Stefan. I was a little let down, though, to see you work to only one thousandths of a millimeter. ;) centerless grinding next!

Did no one else tell you what a great micro lathe you made! Next you'll show us all the micro turning between centers you can do. Great video, as always. Thank you.

OUTSTANDING PRECISION. Love watching your work. Thank you.

So simple, elegant and fascinating.delight to watch your Videos.

Excellent project Stefan! Thanks for sharing it with us.

Excellent work, Stefan, both in design and in execution -- and without tons of expensive machinery and tooling.

Great work Stephan! I love your attention to detail, Cheers, Doug

Very nice tool to add to your shop Stefan it should be real handy to have when you need it.Your talent never ends it seems.

Fantastic - I see a project in the future to make this for my surface grinder - as always, thank you Stefan! Merkwürdig!

Most excellent as always Stefan, enjoyed! ATB, Robin

Fascinating project, top notch execution as usual. Now if I could find some of that rail, that looks perfect for a number of projects. Thank you for taking the time to share your expertise.

I did not need a cylindrical grinding attachment for my surface grinder before I watched this video. Now I don't just want one, I need one like I need air to breathe. Thank you Stephan

Very nice - and precise Stefan. Thanks for sharing. Bob

superb accuracy!

Very nice Stefan. I really enjoy your level of precision.

Nice work Stefan! love that precision..

Stefan, Your building of this surface grinding attachment has helped me tremendously, in that one of the things ou have done for your build answered a how do I? question for another project I am developing.. Thank you so much for the Gr8 video's and the super precise way you explain everything in them...!!!

Wonderful project.The music added a demension bodering on hypnosis.I canceled my yoga class at the V.A.Watching a true artist at work is more effective for calming ones nerves.Something about machining is relaxing to begin with.Thanks.

Thank you Stefan for yet another fascinating tutorial, amazing quality once again. The thing I love about your video's over the excellent video's that come from some really good guys in the US is that you work in Metric. I wish more of the Americans would embrace the measurement the rest of the world uses. Thanks again for all your vids, and the time it must take you to film, script and edit everything for us to watch. Cannot wait for the next project..... (What is it?....) Cheers Rob (UK)

Sweet! Another tool to make more tools. Great work Stefan. Cheers

Thanks Stefan , I love your Idea cylindrical grinding on surface grinder 👍

Love the new rig. Works great.

Nicely built tool. Thanks for the videos.

Hervorragend! Mach so weiter und ich höre auf ins Kino zu gehen! :)

Excellent and love your drive dog! What a good idea.

An inspiring video Stefan.

Pretty to watch, nicely done. I reckon I am smart when I can get better than 0.02 'of a mm! Nice work Stephan.

Great build and video along with discussions of material growth from heat

Great project. Thanks for the details

bloody good mate! I've been thinking about how to make best use of my surface grinder, and bingo bango bongo, Stefan to the rescue again! many thanks for sharing

Hi Stefan. Please keep the 'Useful Tool' video's coming. The care and quality both of the work and the video are very inspirational and you have made a name for yourself with that. "The Stefan way". But, what do you do with them? Could you consider including a few more 'and this what I use them for' video's? Maybe ask your viewers if they would like that, perhaps it is not what they want. The techniques you show are, of course, very helpful and transferrable to all sorts of projects. My very best wishes to you and yours. Bob.

thats insanely precise :)

Excellent and your device meets industrial standads. Like it very mutch.

Just beautiful! I gotta make one...right after I work out how to lock the longitudinal axis on my hydraulic surface grinder.

You are a healthy young man. Try to keep it that way. Consider using a dust mask when grinding; the particles coming off of the machine are very fine and can be inhaled deeply into your lungs. It's a marvelous video. Thank you so much for taking the effort to film your project and post it up for us.

I'm off to shed, Inspired by your skill, soon to feel deflated by my own! :-) brilliant couple of videos, Cliff

Great video as always Stefan.Just a thought but whenever I am called upon to do some cylindrical grinding in the toolroom I always put a little dab of high pressure grease in the centres of the workpiece.It seems to help reduce friction and also reduces wear on the dead-centres.

Excellent series, Stefan. Let me add my kudos to all of the other well deserved ones for interesting subject, good story telling, excellent camera work and editing - and lots more. One consideration in setup might also have been interesting in discussion, and that is your correction in diameter at each end of the cylinder by moving the end of the cylinder down (adjusting the centerline of the part in the vertical plane). Actually the part centerline must be parallel to the traverse of the part in the vertical and horizontal planes or the resultant surface will have conic section shape rather than a straight line. Sort of like what happens when you cut a taper on the lathe with the cutting tool not exactly on the center of the part. Your off-camera setup certainly took care of this but you could have really messed with everyone's brains by mentioning what a horizontal misalignment would have done!

If you don't have a master taper, you could lay a sign bar on the mag chuck up side down & using gauge blocks & a strap clamp on the base.

I might be late to the party as I'm discovering the channel just now. I think all the videos are great. The motor can run just fine on a cheap rectangular USB power banks (1-2€ at discounters). They are marked 2200mAh but in reality are around 1000. At 5V the motor will run fine, albeit a bit slower, and one bank should last for hours. The inductive spikes from the brushed motor might kill them, so a capacitor on the terminals could help. I've converted a lot of small stuff in my home "shop" to run on USB, either stepped up or down. You can even buy ready-made cables that convert USB to 9V or 12V @ 500mA, 5.5mm plug, for 1-2$. For more (mobile) power I use 3S LiPos with XT60 connectors or 8-10Ah motorcycle batteries.

You have the tools and the knowledge to build a real miniature cylindrical grinding machine! maybe a next project? ;)

Well done!

I have a base for a Brown and Sharpe indicator stand that resembles the base you used. It has not been out of the box in 20 years. I guess it is time to get it out and make the head and tail stock for it.

Stefan when I'm grinding pins in my spin fixture I like to use a cold air gun . Old Tool Maker JT Hay Fort Worth Texas

I agree with Billy T, perhaps something on the order of a lathe dog. A round disk with a notch on the edge and a hole in the center similar to a lathe dog. You might have to notch the cast bed, like a gap bed lathe, to clear the set screw in the dog. Just a though from an old brain rusting away on the Oregon coast (USA).

Awesome! Been trying to think up the same type of "thing" for alignment shaft grinding tool and.... Question, wondering if that clamp would make a difference if you put the same size on other ends of the workpiece clocked 180d off just for harmonics/vibrations? Thanks, Stefan you are the Master:)

Hi Stefan Excellent video: clear, informative, interesting-thank you! I especially like how the dog touches the springy end of the hose clamp. To my mind this reduces or eliminates any vibration transfer between these two surfaces. One question. Would there be any benefit to using a tiny amount of high pressure dead center lube? I do recognize that the lube could pick up grinding dust so this might not be a good idea. regards vic

At 29:40, 200mm long steel bar with 50 degree temperature rise makes it 0,1mm longer, not 0,05mm. Part between the centers is about 10mm thick and apparently gets about the same hotter, thus growing 1/20 of 0,1mm = 0,005mm, which was measured. Good video.

Very nice!!!

Sweet gift!

Excellent project. You surprised me with the hose clamp, it's not your usual level of elegance.

Hi Stefan, would you do a video on the QC toolholder used on your lathe. I have not seen the type, and am curious about the design. Thanks!

super simple, elegantly done freu mich schon auf dein nächstes Projekt wie wär´s mit mitteleuropäischem summer bash

Another great project. Very impressive result. Is there any reason that you choose to mount the drive pulley on the moving centre rather than the fixed centre? ( a question, not a criticism!). Keep 'em coming.

Love the built. When grinding “common” tapers (Morse,collet,etc). That you may use repeatedly. Could you machine angle plate attachments (wedges) to easily attaché to jig for quicker setups and repeatability? After seeing you “cheap collet” clean up video. Maybe dial in cheaper collets more concentric?

if the motor overheats, you can attach to it an heatsink for rc models

Loved the build Stefan! Enjoy all your Vork. Vhy do you use such a thick Vheel? Vatching Surburan Tools it just creates more heat....."the enemy of grinding" according to them? I think thats vhy 1/4" wheels are more common than 1/2" wheels? Again, keep the wideos coming! Also my complements to you on your mastery of English Language, it is better than my German LOL

Good vid!

Excellent! Can you please link to where you bought those silicon carbide stones?

Nice. Maybe the next modification could be a sine plate?

Factory installed two thrust bearings on a 50hp pump motor. The motor didn't like to run for very long.

Pretty sure I slipped into a trans during that motor cover part. Hypnotic in a way :)

you will get better result if you plunge in close to the shoulder and get out of your piece, like that you don't end with the little tapper of the use wheel on your shoulder.

master of fixture . Germany !!

Cool project. When you were working on the small diameter tool holder, you mentioned that someone clever-er than you would set up a mister, etc etc. I thought: "He has enough room under the part for a damp sponge. That would help to cool the part, and (maybe) help pick up a bit of grinder dust." Would there be any reason that would be a bad idea, shop wise? I don't think a cheap kitchen sponge would cause any potential damage, even if it caught in the part and got pulled into the grinder wheel. Of course, I am NOT a machinist, and it's not my gear! One other little thought, would a few nuts (in various common sizes), drilled & tapped, to accept a threaded drive pin, be useful for this jig? I think it would be simpler & easier to use something like this, when you are grinding a piece with threads, instead of the hose clamp. The nut might have to be split, drilled, & tapped (similar to some cutting dies) so you can clamp the threads more securely. It wouldn't be necessary if the nut threaded on with the direction of the jigs rotation, but it looks like this jig could spin the nut off. Of course, a jam nut could be used, but I realize that you won't always have enough thread to use one. Just a thought.

Positve air pressure in motor. Wonder how clean it would stay?

Very nicely done! Do you suppose the small run out error came from flipping the part on the centers?

Just a quick note, perhaps you could of used a bearing with contact seals and that way they would not get any dust in them. :)

Hello, won’t the spinning hose clamp impart an out of balance harmonic?

Now you will have to make a small toolmakers clamp to replace the elegant hose clamp.

Dumb question time, you were concerned about bearing noise getting into the surface of the part but you are not concerned about imbalance getting into the part? I doubt the forces are high but are still there and would be much greater than any bearing noise. Great show. Thank you Stefan

Great Job Stefan.. Did you also measure the taper on the arbor after grinding ?

Great work as usual. However, your micrometer is larger than your surface grinder!

How do you keep the vibration from the motor, or the out-of-balance condition of the screw/dog combination from affecting your grind? Or is the assumption that the pressure of the dead center with the spring, and the mass of the fixture clamped to the table absorbing that?

1.0 sehr gut!

How long is the bed of the cylindrical grinding attachment?

Use soft wood with carbide paste or alum. oxide

Hello Stefan, very nice work as usual! I can't get my head around, if it is necessary to center the grinding wheel with work piece when grinding tapered surfaces? In my mind, if the wheel isn't at the center of work piece it would affect to the taper you get.

Worlds most accurate toilet roll holder

No. Yes. OH!

could prolly use a laptop powersupply , these can be found in 12 volt pretty eazily

....and where did you get the base for your grinder jig? It looks like the ways from a mini lathe, maybe? Thanks! :)

I detect a strong George Thomas influence in those lathe mandrels Stefan. One large step beyond his though since yours are hardened and proven almost 100% ground concentric.

It also could be fixture is not 90 from spindle

just an observation on your measurements. you measure at the extreme ends of the part. I believe this might not be a true measurement. the leading edge of the grinding wheel is doing all the work, and therefore will wear more. So since you sop and reverse the direction of the grinding wheel, you introduce a taper at the end of the part where you change direction..

What is the accuracy of this machine

Stefan, I have a Harig-style grinding attachment and I’m struggling to eliminate an issue with it. I am getting an hourglass shape part. I suspect it is caused by the horizontal alignment of the fixed centers. Does this sound correct, or is it something else?

Vielen Dank erstmal für die Videos tollen Videos. Was mir bei anschauen des Videos jedoch sofort aufgefallen ist, ist dass die Seite der Aufhängung mit der Federung sich mitdrehen kann. Wenn (und da gehe ich von aus) die Spitze nicht absolut zentrisch ist wird das Werkstück eiern... Ansonsten super Idee und Schöne Maschine =) Ich werde mir die Tage auch eine Flachschleifmaschine zulegen. Beste grüße aus dem Norden

haha.. what was the Noo!! Yesss!! ohhh!! for approx 3/3600th of a hour prior to 27:00 ? :D , it made me laugh my head off at the spontaniousness

Hi Stefan, what is the rpm of the workpiece? Thanks, Serge

Those paparazzi... They are always trying to intimidate you on camera!

super teil, vielleich könnte mann darüber nachdenken, dass Riemenrad auf der festen Spitze zu montieren um vibrationen zu vermeiden....

I want one

Does this old tony get ya down sometimes?

I am failed to see the difference between grinding with this attachment and grinding between points on a lathe with a very sturdy tool grinder, assuming all top end equipments.

How do you determine the error is from the tilt of the jig and not from the perpendicularity to the grinding wheel?

Es macht u.U. keinen großen Unterschied, aber die Schlauchschelle ist nicht achsensymetrisch. Bei 9000U/min und einem Unwucht von 1g in einem Abstand von 2cm von der Achse macht das eine Kraft von ca. 16N . Das Werkstück wird also immer eher auf der einen Seite anliegen. Beim Umdrehen des Werkstücks und neu ansetzen der Schlauchschelle,....

👍😎

Stefan .... wth ...??!!! You cou!da laid a countersink into the endgrain of a Maple/Ash/other hardwood ... dabbed the tiniest amount into it... and pressed it onto that part until the sun set in the North.... for a Polished finish.... LoL I am waaaay smart ... EH ?? !! ??