How to use a D-Bit Grinder - The Basics!

This episode on Blondihacks, I'm showing the basics of how to run a D-Bit Grinder for making your own cutting tools! Exclusive videos, drawings, models & plans available on Patreon!
/ quinndunki
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[@ThisOldTony]

great overview!

[@adamduerr1203]

She took a cue from you at one point and talked emphatically with her hands. I was confused because I heard her voice and saw your mannerisms.

[@Blondihacks]

All the hand-talkers learn from Tony. I spent 6 months in his mountain-top monastery machine shop. Mostly hauling stock up and chips back down again. He assured me it was a spiritual lesson.

[@samcoote9653]

@@Blondihacks Did he teach you how to karate chop steel to size!? the ancient techniques!

[@DavoShed]

Sam Coote I saw The Cast Iron Gypsy punch out a metal disk with one blow of her hammer just the other day ;)

[@paulypaulypauly8011]

Blondihacks was it Ave or TOT? ;-)

[@greengohm]

Can we all stop for a moment and appreciate that Quinn is providing both imperial and metric degrees for all the angles mentioned in the video? ;)

[@d00dEEE]

I can't wait until she graduates to gradians.

[@andrewwilson8317]

Missed the bit where it changed to milliradians? Makes sense as way more accurate than old fashioned degrees ,minutes and seconds!

[@mpetersen6]

@@andrewwilson8317 Thank the Sumarians

[@Железняк-х4р]

Прекрасный, познавательный и полный урок по работе на этом станке. Огромное спасибо, с нетерпением жду следующий урок!

[@deanomec]

Having worked with people who are not very good at teaching has made me very appreciative of those who are. Excellent job on this tutorial!

[@MikeBramm]

Back in the late 80's, I worked at a company that made steel type for embossing/debossing the codes on the bottom of food cans (now these codes are printed with an ink-jet printer). I would cut the characters into the steel type pieces using a 3D Pantograph. The cutters we used were created by grinding away half of the end of a 0.250" carbide blank (just the one you had) using a cutter grinder similar to the one you have, then grinding a conical shape with a 0.010" flat tip. The resulting single-flute cutter would cut a 0.020" wide path in the into the steel to produce an embossed character.

[@andrewwilson8317]

Did very similar but we were using the tools on the Taylor Hobson pantograph to cut very fine gates and runners in injection moulding tool die sets. The pursuers were very high so everything had to be perfect. Solid tungsten carbide was used to make the bespoke cutters. Think there still some in the odds and sods drawer in one of my toolmakers toolboxes! Might come in handy some day....

[@jimsvideos7201]

I enjoy your videos because they have the same clear-headed sense of purpose as the 50s-era technical films, but with much higher quality recording and the odd interjection from Sprocket.

[@fepatton]

Me during the previous D-bit grinder vids: "Yeah, this is cool, but I don't really see the point." Me during this video: "HOW WILL I LIVE WITHOUT ONE???" Great video as always. :-)

[@CaptainSwoop]

This is a clear, concise, erudite (I googled that), bloody excellent presentation. You put a lot of thought and effort into this presentation ... and it shows. Top job - Thanks.

[@jasonboren9951]

MASSIVELY helpful to understanding the parts you were disassembling during the rebuild. Thank you!

[@DEburg-or8gb]

Best instructional video ever! No bs talking all info. Perfect

[@jhfisher60510]

Timing of finding this was pefect took my new cutter out of the box today! Very Very Helpful. Thank you!!

[@brunosmith6925]

By far and away the best tutorial. These machines are very detailed, and can be very confusing to set up and use. I've been grinding my engraving cutters on a lovely old Scripta - bought via eBay - and no manuals or tutorials were available. So I learned through trial and error. But after watching this excellent presentation, I take a LOT of comfort in now knowing that the techniques I am using, are in line with Quinn's.

[@billyhooks99]

I am not worthy of being in your presence. Totally impressed with this machine and your knowledge of how to use it.

[@davfew]

That was a excellent tutorial and went some way to demystify this amazing tool. Thanks Quinn.

[@lawrencerudner1734]

I am amazed at the time you spent learning about the various configurations of the similar but different makes of grinders. Thank you for doing that!I have had mine sitting on the bench for over a year but I will now how to at least start to use it. Not only did I learn much, but I finally subscribed.

[@amanofmanyparts9120]

You, Quinn, are the reason I don't get anything done! I've sat here and watched/listened to you show me how to grind a tool that I'll never need, to do a job I'll never do, on a milling machine that I don't even have the space for ... Ggrrrrr!!!!!

[@markfulmer8501]

One of the best videos presented on d bit grinder set up and use I've ever seen . Thanks

[@rpavlik1]

Wow, so that's what all those joints you had to refurbish were for. Very complex but very "right tool for the job". Great video!

[@benkeller3]

You are indeed a great teacher. Thanks!

[@AmateurRedneckWorkshop]

Very good tutorial. For a minute there I thought I was watching Robin Renzetti.

[@Blondihacks]

The highest praise! ☺️☺️

[@neilleach5249]

Happiness is a How To video. Thank You.

[@Reach41]

I have to quit watching this channel. Every new episode reminds me of something else I need to buy.

[@Blondihacks]

I own this damn thing because of Stefan’s video, so I know the feeling. 🤣

[@boostie1005]

@@Blondihacks Thought you would do this in a German accent.

[@Mtematiks]

This is general problem !

[@Mtematiks]

@@Blondihacks I understand the need of the grinder, after I purchased an Alexander panto-graph after watching Stefan channel 3 years ago :))) But it can be used for a LOT of sharpening and grinding tasks in the hobby shop :) Great video! Thank you !

[@MrJoeGarner]

I've been seeing that quite often myself, been off work for a few weeks so can't wait to get back on the job to get some of my wants for the shop.

[@dointh4198]

This was an amazing introduction! I've got a Deckel S1 and almost everything translates very well to this machine.

[@Rangemaster26]

It looks like a baby Monoset grinder. I used one of those for several years while I was working in the grind room of the aerospace company I was working for. Those were amazing machines... you could do anything on them. This D-Bit grinder looks like everything anyone would need in a small shop. Pretty Cool!!!

[@larryschweitzer4904]

This is the 2nd time I've watched this video. Makes more sense to me now. Thank you.

[@JackdeDuCoeur]

You've inspired me. I could use a d-bit grinder to shape my right-hand fingernails for guitar picking. Proper shaping is essential for surviving steel strings. I can use any old kind of sander to clearancing my left-hand fingernails for fretting. Thanks!

[@firebird8600]

Yay!! It's time for Blondihacks!!

[@firebird8600]

@Tom Faigle Same here. I was following Quinn's blog during the Veronica build, but my computer let out all the magic smoke, and I couldn't find it afterward. So glad I found her KZbin channel.

[@AaronAlso]

Knowing just enough to be dangerous is my specialty, LET'S GO!

[@kokopellie]

You do such a great job explaining things and I love ❤ you sense of humor. 🤗

[@1967Twotone]

I didn't realize I need one of these until now.

[@PaulMorley1]

Fantastic video Quinn! Actually one of the best, and most concise, explanations on the web. I just purchased the Shars single lip grinder and have watched this vid many many times. ha ha. I did make a bit of a bonehead mistake and ground a HSS cutter with the diamond wheel initially which i have since read is a no-no... Diamond for carbide, CBN and Aluminum Oxide for HHS. Thanks again Quinn!

[@woodscreekworkshop9939]

This video will help so many people. 👍🏼

[@Blondihacks]

You kept asking, so here you go. 😁 Meanwhile, your last video got me to buy a 3M deburring/polishing wheel. It works so well!

[@beachboardfan9544]

Holy hell! The basics! D bit grinders are overwhelming

[@nathanielstephenson7932]

That was a fun video, thanks! I have made a couple crude tools of this fashion on the 4-axis lathe at my work. Surfaces aren't that great (milling instead of grinding) and I'm limited to tool steel at best. I've only used them for odd channels in Delton so I actually just used cold rolled steel. My favorite one (well, this was a turning tool, not a d bit) was a ID thread tool for a 4 lead TR (metric Acme). Same basic process, but the business part protrudes from the round portion and I had to put relief on the lead edge by hand because I was one axis short. Just occured to me, that grinder would be a great way to make that type of tool as well. Hmmm... You could also make some great solid carbide micro boring bars using that thing.

[@rameshbharakhada5497]

Your explanation is very good

[@pitot1988]

I have always want to learn how to use one, thanks Quinn!

[@wolfitirol8347]

Made a few wheel parts which now has every different wheel its own and changing goes very fast 😊

[@randynovick7972]

Heavens to mergatroid, I have been waiting so sooo looong for the tool grinding video. Nice! I'm going to have a sandwich to celebrate. Looks like you got a fist-bump from Tony, too! Sweet! Many thanks!

[@DavoShed]

I have not seen Dbit grinders in use before. This is a great video that I think explains the process really well. I have a small tool and cutter grinder than has a ball nose end mill attachment. My grinder doesn’t have all the swivel stuff of a full T and C but I wonder I’d I can get it to make a Dbit. As you said I now have enough information to be dangerous.

[@jaybee7952]

Thanks especially for the radius/vernier info. Have been looking for help with that for a while.

[@larryschweitzer4904]

Another good site on the subject: The Tool And Die Guy. I have a Shars knock-off. I struggled with setting it up, actually still do. But on many things just using a commercial tool as a guide helps a lot. Also found that exact setting is not required. I can do quick and dirty set, grind and get away with it very often. The drill bit sharpening fixture that came with it isn't worth the time to set it up. You can just put the bit in a collet , eyeball the settings and be done in a short time. Spending a bit more time you can do split points on large bits. Bits cut great. I had some brazed carbide lathe tools that were dull. Was quick and easy to sharpen. Use dust collection & a mask while grinding carbide. As for lathe form tools, that gets to be a trickier thing. I know that you are not supposed to use diamond on steel, But, the Chinese wheels are pretty cheap and the CBN wheels are more expensive. Most of the time I just leave the diamond on and it has lasted well. I don't like the grit, dust, rapid wear of the Al-Oxide wheels. The very thin cut-off wheel is very fragile! I bought the Shars when they had it on sale a couple of years ago. The fit of some of the parts is less than ideal. The scales are crude. The instructions are --- worthless, look for the online Deckel ones. I added a second work light on the left, helped a lot. Would I buy it a gain?? Maybe.

[@Blondihacks]

Yes, the Tool And Die Guy’s series is what got me started with this machine. I shouted him out earlier in this series. Very helpful videos.

[@VoidedWarranty]

So helpful! Thank you! I think now I could get mine to do what I want

[@pjbaddict]

Great video, I might look at getting one to sharpen my woodturning chisels... 😁

[@AdeSwash]

Very clear and understandable, thanks

[@rodbennett4790]

G'day Quinn, I bought a clone recently but haven't used it yet, so this video is perfect timing! I've watched other videos on the topic but never really got it. Now I get it! Many thanks and I look forward to more. Sharpening drills, end mills, taps, reamers?

[@Blondihacks]

You bet! More videos coming

[@Kotikjeff]

Very well explained.

[@Maskinservice]

Oh crap! Another tooling machine that I suddenly need. 🙂

[@Strawdog]

If you ever start to teach machining I would definitely sign up for classes Thank you for the videos

[@RexusKing]

This machine feels like it's designed by Xzibit: Yo dawg, I heard you like slides. So I put a slide on your slide, and the slides are on a bar, which can slides too! I think you did a fantastic job explaining everything, I think I've already forgot 20% of what you said, but this video will be a great source of information for me!

[@toolbox-gua]

Let me go over all of it again, and again, and again. ... It is me who is not paying attention! Great video, indeed very well explained.

[@timwhiskerd2133]

Amazing explanation, welll done I give you 10 / 10

[@wesley115777]

@6:30, Quinn, how's the surface finish from that sharpened finger?

[@AerialPhotogGuy]

Hi Quinn :-) I'm not completely familiar with the brand of grinder you own so I may be completely wrong about this but it looks like the 1st horizontal joint up from the axle has a protruding pin in the perimeter, if that pin is pulled out enough to clear the stop it should allow you to move past the 90° point (referring to the joint that you said only moves from 0° to 90° on that particular model). Mine will only move from 0° to 90° as well unless I pull that pin out enough to clear the built-in stop, then it moves an additional 25° or so (I haven't noticed how far it will rotate past 90°......yet). Thanks! :-) Joe

[@Blondihacks]

Nope, that’s not how this one works.

[@AerialPhotogGuy]

@@Blondihacks Hi Quinn, Thank you for your response! First, I just recently started watching your channel which means that I wasn't aware that you had completely rebuilt your single lip cutter grinder (D bit Grinder). If I had known that you rebuilt it, I would have realized that you would know exactly how yours is made. Having said that, please realize that my comment wasn't meant to undermine your knowledge, I was genuinely curious if there are clones out there that do not have that feature. Most of the clones I've seen do have a little pin just under the front of that joint that allows for an additional amount of rotation by a few degrees. Personally, I use that feature fairly often, I prefer to grind into the cutting edge rather than away from it, if I can, I try to avoid having to remove burrs on the cutting edge, I'm all for honing less and cutting more, of course there are times when that's not possible. As for not being aware of various features on our machines, sometimes we're not aware of them until we watch somebody else using a certain technique or pointing them out directly........ it seems the best way to do that these days is to watch KZbin videos :-D I've seen a couple seasoned machinist discover a new feature after many years of using their own machines, if we could only get detailed videos from the engineers that designed and built them :-D Thanks again and have a great day! Joe

[@AJR2208]

Nicely done Quinn. That's a very good explanation. You managed to fill in some of the points that both Stefan and Robin glanced over with their videos on these machines. Does you motor reverse spin? It'd be handy for the times you work on carbide so you can always grind into the tool's cutting edge. Stay safe and well :)

[@Blondihacks]

Sadly no, it only spins one way

[@randyjohnson7902]

Very knowledgeable and quite helpful. Jokes was appreciated LOL

[@pcrengnr1]

Quinn thx for sharing. So, this machine also is a great fingernail shaper too. Hahaha. Very interesting machine. Wow, so, many degrees of freedom.

[@VoidedWarranty]

this helped a lot, so I came back again! I have a clone, and I'm missing that near 90 degree indexing mark. I actually suspect it's a similar spot on mine, but I also think my indexing ring is off by 15 degrees or so. Could you confirm if when you're in the 180 degree circle mode, does it stop right on 0? if so I'll reset mine to there. Whoops! I read a bit longer and that's exactly what it's doing. This is the only video on the internet that's let me solve this!

[@Ron_EZ]

Holy crap! So in other words... "Not complicated at all". LOL great review

[@imanoleonardo6902]

Never seen one, good video!

[@sampitts7044]

Great video.Thanks

[@michaellinahan7740]

Quinn I have just 'treated' myself to one of these U3 grinders but I can't seem to find the window or red dot you mention and the manual is not worth the paper it is printed on. I can split the blank ok but in the next part where the tool is used to set the flat the orientation of the part is not the same as in your case. In mine the ground flat seems to be less than 90° to the wheel. I did the relief behind the cutting edge and the circular relief by eye. I actually want this to function as a small boring bar and will try it out next week when I get some more shed time.

[@brilloestelar1]

Hi Quinn, Please, let me ask two questions: 1st.- Could you tell me the proper grain of the grinding wheel to get a good sharpening? 2nd.- I would like to know the measurements for the collet. I own an ER20, but it is too small, and I have an ER40 that is too big. Many thanks.

[@magnusklahr8190]

Great video!!👍

[@captcarlos]

Superb overview of that D bit grinder. Easy to understand, step by step explanation of grinding a D bit. I agree with another commenter that your explanation surpasses that of Robin and Stepan in some ways. As much as I revere those two, your video assumes a more entry level of knowledge and therefore doesn't skimp on instruction. It's a pity the end clearance swivel doesn't allow that to be ground in the standard grinding orientation. Perhaps a file could lengthen the slot sufficiently to swivel a few degrees past square... Thanks Quin.

[@bigrick7108]

You could easily remove the stop. But the graduations on the ring might not be there.

[@captcarlos]

I'm sure an enterprising young lady would be able to extend the markings enough to show up to 10deg, excessive really, but neat. Perhaps a modified pin.. Just trying for a grind into the edge to save chipping.

[@Blondihacks]

I believe it actually is possible to do that with this grinder, but it’s an “advanced” setup I haven’t tried yet.

[@captcarlos]

Quin, I believe in you. I can see another D bit video coming. The price of 2nd hand D Bit grinders has just skyrocketed! Keep up the good, informative and fun to watch videos, please.

[@rldoyle5705]

Very good vidjo thank you I have one did not know thing about

[@stockstergates4061]

is there any video for drill, end mill and so on, thanks

[@johnptc]

another great lesson :)

[@marknahabedian1803]

I had trouble understanding which edges, surfaces and angles you were referring to on that tiny but. It would help if you had some larger drawings to point at. Maybe explain each bringing step and setup with respect to the drawing first. Looking at some of the other comments though, others seemed to get it without a drawing.

[@caseytailfly]

This is the machining equivalent of learning vimscript. Similarly if you aren’t careful, it can do a lifetime of damage

[@vicentegantuangco286]

Where can we buy spare of that d- bit holder only

[@semsem2514]

I want this grinder

[@Texicles]

My favorite use for D bits is custom reamers. In olden times, gunsmiths who needed a chamber reamer for a one-off, and especially for developing wildcat cartridges, would profile a round blank into the shape of the chamber to be reamed, grind half of it off and hey presto, a little heat treat and edge prep and you've got a custom reamer good for at least one use. Alas, it's a (D) bit of a lost art these days.

[@CapnCrusty]

Since I discovered D reamers I hardly ever use a boring head or bar any more and instead I make a D reamer from the same shafting that's going into the hole and the shaft is a perfect fit in the hole. You can even grind the flat on the reamer a few thou past half diameter and it will ream an undersize hole for a press fit. I make them by hand on a bench grinder in just a few minutes.

[@Rimsey1966]

Great video - very informative. I am looking to but on of the grinder to make wobble broach Hexagon tips. Will the machine be able to index 360 degrees to allow for this?

[@piecetoyou8285]

Never been great using engineering tools, where measuring involves , splitting the inch into a thousandths then splitting that into even a smaller number, mind boggling to me, But what a great illustration best one seen yet on you tube, I know that the inch is being split into a thou but just confuses me where to move the look on dials , or if written down as a fractions, But looking at this machine , what a piece of engineering, love stuff like this, I heard the modern china machines are a fraction of the price, but have found to have some issues. The cone part that the diamond wheel is bonded onto are out of true and cause slight wobble on the stone,don`t know if this is for every machine that comes from china, or if it may be a certain manufacturer from there, But If you have a lathe you can true them up, These earlier D-Bit Grinders made back in the days changed the spindle type some years down the line so if you have a older one when they first came out beware looking up for replacement spindle, after I think the late 50s or 60s they changed the spindle mechanism,

[@sansdecorum4600]

So, given the proper attachments, this is how machinists achieve the perfect manicure and pedicure. Sure, a 4-1/2 grinder and flap-wheel works, but this thing is next level.

[@pchgeelen3523]

Nice

[@JM-cg3ps]

Can you use this thing to sharpen a unibit/step-bit/step drill?

[@dbsonly2851]

If you remove that screw on the top of the swivel head, it will allow you to swing past 90 deg. That screw is a stop.

[@Gronicle1]

Ouch! The set up is complex enough that I would have to make up a check list to keep from messing up. If I pulled off the SAMI specs for a common straight wall caliber and sent them to you could you show us how to make a dimensioned chamber reamer? V groves are neat, but chamber reamers are much more useful in daily life. At least for some of us.

[@Stefan_Van_pellicom]

Pfieew, that was a hard one ! 🥺

[@Blondihacks]

It’s not bad once you do it yourself. It takes longer to explain than to do, honestly. 😀

[@BobLewen]

You didn’t do “tappy tap tap” when you tightened down the blank!!

[@Nemozoli]

Quinn, dammit, it is your fault, now I will have to get one... right after the larger mill. Is it possible to grind normal twist drills with it (split web and all)?

[@Blondihacks]

Yup, you can grind drills with these. There is a special attachment you can get for the purpose, but it’s possible to do without that as well.

[@Nemozoli]

@@Blondihacks So, it is a certainty now, I just had to ask... :D

[@RedDogForge]

Amazing! Are these specifically for Dbits only or are they also good for 2/3/4 etc flute cutters and bits?

[@Blondihacks]

You can do quite a bit with them- regrinding endmills, drills, and making lathe tools are all possible. It’s a surprisingly flexible machine.

[@jerrysgaragethemoneypit2028]

Where would a person find a D Bit grinder?

[@ScaleDreamsStudio]

Great! My brain hurts now! lol

[@RemoWest]

Very informative video ! Looking for one of these, but likely will have to get a "clone". Any idea on one that accepts 3-28mm collets. I have seen they are available. The draw-back is all sellers appear to be in china. Would much rather prefer US seller if possible. Any info would help. Thanks! P.S. saw you on the group project with NYCNC, ABOMB, Jimmy DIresta... etc. Subbed!

[@thecerealcommie]

But will there be a merch interlude?

[@Blondihacks]

Can’t do it every time or it’s too much. 😬

[@buixote]

For *real cheapskates* , I'm thinking a little diamond wheel on the dremel might work. I've sharpened carbide sawblades this way... clearly not a "precision solution", but it also cuts down on the "fill-factor" on the shop.

[@MrBuck295]

Quinn : I hope this gives you a taste of whats possible with D bits Me : Tastes like strawberries dipped in chocolate for some reason

[@terrinewman7390]

this is way over my head! to many angles.great video anyway!

[@trangotowergmail]

I have had one of these lying around the shop for more than 10 years. Experimented with it occasionally but never really understood it. Now I NEED to go to the shop and make one of those single flutes :) Mine also has a drill bit sharpening jig. Would be great if you can make a video about using that jig.

[@TangentJim]

Nice Job , Allow me to translate D-bit to mold making terminology . We call them Split Rounds.

[@JimWhitaker]

I think my brain is hurting.

[@aaronpadilla458]

Does she said raison d'être??

[@Blondihacks]

She sure did

[@aaronpadilla458]

@@Blondihacks tu parles français?

[@gregfeneis609]

Knows radius

[@johnapel2856]

What a cool machine! So... it's for grinding D bits? What's a D bit? "Shut up John!" Did you hear that? Nevermind. Neat video. Thanks, and Meow to Sprocket.

[@broglet2003]

I have watched a few D bit grinder videos but this was the most informative as to how they are used. Thank you.

[@danmooney6881]

I was just thinking while watching, if this You Tube thing doesn't work out, you can be a Hand Model!

[@flyingjeep911]

Knowing just enough to be dangerous is my life motto

[@stu-po]

I looked in my bit box and found A-Bit. I've got some learning to do to get to D-Bit. This is a good start! Great Vid as always, nice clear explanations of complicated stuff. And A-Bit of humor. :)

[@dalejones4186]

Hi Quinn. Thank you. This is exactly what I needed. I just bought a D-bit grinder and need to learn how to use it. I learn better in the show me type lesson. Thanks again.