Twin Turbine Rotary Grinder Tool Powered by Vacuum Cleaner

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This is actually a revision of this goo.gl/mHP2Ff but the major difference now is that it's precisely machined, It's more durable, reliable and more efficient. Nothing can beat hobbyist's rotary tools, but it's a prototype that I wanted to try out now that I own the PocketNC (5 axis desktop milling machine).
- PocketNC goo.gl/NdTxBS
- Harvey endmills www.harveytool....
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[@mcioga]

that rotor balancing tecnique made my day !! thank you for sharing :)

[@rcrazee5077]

Also find it very interesting..Craftsmanship level 99 :)

[@Kavster92]

Honestly how ingenious is that? Using the magnets to create a frictionless rig for the shaft? Amazing to even think of it really!

[@mstrVLT]

same like Igor Negoda kzbin.info/www/bejne/nJLVkmR5bbd9kK8 )

[@salmanal-harethey1486]

I was like do I see what I am seeing

[@ItaloLoureiro]

@@Kavster92 Man, I just realized now that those were magnets. I thought he had made some sorcery I could not see... But a magnet holder to balance is fantastic!

[@eformance]

Are you planning to attend Dental School as your new hobby?

[@poptartmcjelly7054]

image going to the dentist and he pulls out one of these

[@wickedprotos1937]

lol aaaahhhh that sound... of the dentist :-)

[@professoreggplant9985]

Interestingly, I've seen air powered drills such as this in the dentist office.

[@doorguner01]

AVE gave up on it Not this guy!

[@locouk]

JohnnyQ90’’s Wife: Johnny Q has been vacuuming his workshop all day, it must be spotless by now?! JohnnyQ90: 😂😎

[@Simion_T]

Wife: "Johnny, the living room awaits!"

[@Saucer500]

@@Simion_T you want me to make random holes in the living room honey ?

[@_P0tat07_]

Sick. Much better than the dremel version.

[@SuicideNeil]

I was thinking the exact same thing- I was expecting this one to be just as weak but then it completely blows away the Dremel version in the testing, so much more torque.

[@Not-C-418]

hope for the pocket NC lol

[@thegenerousdegenerate9395]

Pretty sure this IS the dremel. Did you see the hose while the tool was working? He made 2 one with air and the other attached to his dremel. I call shennanigins.

[@daftbence]

@@thegenerousdegenerate9395 Nah, you're just seeing things.

[@octane613]

@@thegenerousdegenerate9395 I normally trust Johnny to make real things but I have to agree with this. It didn't sound or act like the vacuum powered one when he was actually using it, and it didn't bog down hardly at all when it was put to metal or wood. And it may just be my eyes, but the end shot, I feel like I can see it "cog" a little bit when he turns it off, like a rotor in a motor. I really want jq90 to clear this up, because I too call shenanigans.

[@rileytrain9254]

It's almost more useful that it vacuums the debris while working

[@andrewyoung4473]

yeah maybe a filter to stop the large debris and a funnel to get in close to the powder

[@mate7255]

Yeah but damages the propeler of the turbine

[@loud_n_lowtaco200]

Battle Ground Survivor not if soft nonmetallic materials are used

[@mate7255]

Cobster Wilson yes I know, soft materials wont do damage

[@brunovlaminck9901]

Chineses know what the next gadget they will sell

[@OminousPinapple]

I'd love to see a disassembly and inspection of this after a month of use!

[@2011metalmaniac]

what happened to the supercharged wankel engine?

[@송찬민-t2c]

Wow long time no see. I love your making. Please more upload the video! Have a nice day. Good bye

[@Warloghe]

Love the channel Johnny, I wish I could do half of what you can.

[@Gamerock82]

True that.

[@gabrielscalese9248]

Your inventions are awesome!!!! What happened with the rotary engine with supercharger

[@Hobby_Electric]

I WANT THIS MACHINE !

[@NitroRC]

Du auch hier ^^

[@Hobby_Electric]

@@NitroRC Klaro :-)

[@MrCarnutbill67]

Alright alright, back to the turbocharged engine. Haha

[@ronniepirtlejr2606]

Place the vacuum hose on the exhaust port. Flip the motor over so when you use it, the debris will be blown out of the way instead of sucked in!

[@raushankarimov4320]

CNC Igor Negoda

[@friggyfrig123]

Да уж, коллаб с Негодой вышел бы знатный!

[@MisterVoodoo]

Игорь дремелем лопатки вытачивал вручную))) точно CNC

[@Excvositorum]

Без кофэ не то....

[@Excvositorum]

Призовите Игоря в тему ;)

[@giggawc8457]

I don't think this pocket cnc is sturdy enough for inconel

[@salmanal-harethey1486]

9:13 I was like whaaat. I never knew something like that exist. I am latterly smiling.

[@LutherFPV]

the amount of effort put into this video is just INSANE! The people who dislike this video doesn't understand that! It makes me irritated :/

[@AndoniOlea]

Next step, a real combustion turbine like the ones used un aeromodelism.

[@MATEKYOO]

and installed on his rc car... (for replace the original nitro motor)

[@AndoniOlea]

@@MATEKYOO i like that idea, but for that it would be bettet to use it like in a helicopter, they use the turbine to make rotate the rotor instead of for thrust. If you use a turbine for propulsion on a RC car, even just having it started without accelerating, it would make it move forward and that is a problem.

[@kadmow]

@@AndoniOlea : hypothetically it should have a free power turbine geared to the transmission... (direct gearing the gas generator to a shaft converter is a bad idea, though it is a cheaper / lighter alternative) Axial RC turbines, who wouldn't want them... ( though they do suck and blow thermodynamically at that size, allegedly)

[@AndoniOlea]

@@kadmow You are correct in that, but if he uses a turbine in a conventional way, he should add brakes to the car (it doesn´t matter how they work) but it needs them.

[@AndoniOlea]

@@kadmow This in size is not too big, but neither is it small. Generates 8.6Kg of thrust at full throttle. kzbin.info/www/bejne/gYHXpH-GgrmJpLs

[@graphenepixel8231]

My brother liked the music in this video, what are the names of the songs and artists?

[@blackturbine]

The power of succ

[@theimperfectgod7140]

_Memes_ 😂👌

[@lpjunction]

vacuum cleaner normally runs 1.5kw to 2kw that will put this tool amount the power tools.

[@blackturbine]

@@lpjunction and air turbines are around 10% efficient so you can expect around 22w of mecanical power output, still not so bad

[@lpjunction]

I am aware of thr efficiency I meant the machine is taking 2kw level of power that puts it amount power tools That`s based on the power consummed

[@alexwood7417]

What happened to the turbo rotory engine?

[@djsid01]

yeah im also waiting for the next video i want to see how much power that rc engine got

[@olgaolga2489]

Игорю Негоде не показывайте, а то у него глаз задергается

[@hate-conductor]

А я ток хотел линк ему в камменты скинуть...

[@ГалинаДолгополова-т3г]

точно)

[@AA-ym9pz]

"I have a СТС and Lathe for more than 5k EUR. But I have no more money for a mini drill!" 40 eur, Carl!

[@andinbriwel1092]

I particularly love how your videos successfully illustrate just how much work goes into a project like this. So many of these type of videos leave people with the impression that projects like this can be quick and simple if you just have the right tools, but your videos successfully communicate the necessary skill and significant amount of time required for such an intricate design, while still not becoming excessively long! Great work!!

[@WinstonMakes]

Dude! Those are some amazing looking parts!

[@johnnyq90]

Thanks man! I'm really glad you liked it 😁

[@TheSoldatov]

Привет,любители,турбо микро пылесосной тяги))

[@neo_ex]

турбина долго не проживет, весь мусор через нее летит, за то чисто вокруг ))

[@АлексанрЗубарев]

А нкгода то рулит

[@АлександрИванов-в7т1н]

😂

[@DoRC]

I wonder if you could get better efficiency by making one turbine a different shape like they are in the stages of a gas turbine engine. At this scale it probably wouldn't make much difference but could be cool to mess with.

[@MrApple-yw9vp]

The project is really cool, but will the bearings survive the insane RPM's ?

[@thatguythatdoesstuff7448]

Even ABEC1 bearings are rated to 30k+ rpms when the bearings are this small. I think the loads and temperature are a bigger concern if he's doing sustained work with the tool. Temperature might be mitigated by airflow through the tool.

[@abefroman7393]

Didn't expect it to work so well under load.....awesome....what would you estimate the rpm is?

[@coreyfro]

You shouldn't use such long reach tooling for every operation. Your feeds and speed could be higher and your finish will be better if you stick with appropriately sized tooling. The machine will also be quieter, which is evidence of better tooling selection.

[@ebealienthy]

Hello, I express my point of view. You have worked well and I liked it, The beauty is to plan and succeed in realizing and solving.

[@The_Bandit_750]

That's insane

[@nunyabizness199]

I remember Kirby vaccuum company making tons of attachments for their vaccuums, like even paint sprayers. But I don't remember them having a die grinder..😁 Very nice !

[@G40bv]

Next project... a filter cap so it won't damage the blades. Awesome job

[@dhirendrapsingh6758]

Informative. Useful. Calming. Inspiring. Life-changing. Enjoyable. Heart-warming. Other.

[@greemstrider]

Aaah.... enginner porn. Absolutely stunning work!

[@ffss2989]

Hi I am from Iran And I really enjoyed the design and the steps of making and assembling and the operation of the device, it works exactly like the dental device, well done to you craftsman.

[@chezzz65]

Его нужно срочно, вместе с оборудованием к Негоде отправить...тогда точно к марсу стартовать начнут

[@Kolyanznaet]

Лучше Игоря к нему, пожалейте иностранца 😂

[@romashamil6787]

Согласен он без стопка сдаётся

[@romashamil6787]

Негоде не показывает ато плохо ему будет

[@ancherny]

Игорю-то чего? Это ему плохо будет, когда увидит, как Игорь лопатки руками из инканеля точит! ))

[@hiteck007]

I really like the CNC machine & where did you get the design & code from?? This is the coolest build I've seen a while. Can I suggest you build a Tesla Turbine with a fly-ball Governor on it with a combustion chamber & a couple of Valveless valves for intakes. You could make a fuel powered Tesla Turbine as an experiment. That'd be extremely interesting.

[@rafee9442]

High RPM but low torque right?

[@lavdrimmmmm]

This sound of turbine reminds me being to my dentist🤭😱

[@juanitotuazon2623]

True

[@MementoNeli]

Now mount that to the cnc, see how it preforms, it might be actually pretty good to mill :p

[@TheScarvig]

my first thought: could this work as a self cooling/ self cleaning spindle for diy cnc machines?

[@MementoNeli]

@@TheScarvig Ye it sure would work. Speed seems high enough. But the particles that get sucked in might damage / unbalance the turbines thus causing vibrations. But a blowing vacuum would solve this problem and actually would remove the need for a chip cleaning blower thingy... :p

[@Lele422]

Hey Johnny, why don't you make a mini jet engine? It has been one of your first videos and it would be nice to see you making one that actually works and it's self sustaining. I'm sure with your new equipments and knowledge you can do that! :)

[@ЭЛЕКТРОНЩИК-б2в]

Когда пересмотрел Игоря Негоду :)

[@MirexII]

Игорю бы такой ЧПУ, он бы уже наверное по луне ездил, огород городил. :))

[@neo_ex]

у него же вроде есть чпу какой то, он просто не научился им пользоваться или просто по кайфу сделать это на токарном и фрезерном с ручной подгонкой.

[@MirexII]

@@neo_ex насколько я помню, это был 3д принтер, а это слегка разный функционал.

[@blacklion79]

@@neo_ex У него плоский был, 2.5D, и здоровый, врядли там точность такая высокая.

[@АлексанрЗубарев]

Ну парень сделал,но мы то знаем

[@michaelthibault7930]

Pretty! But why do you need such a beast when you have both lathe and CNC machine? Tools are a contagion.

[@JG-iw8mh]

I would not be mad at all if you pumped out more videos.

[@johnnyq90]

I wish I could upload videos at least once a week, but unfortunately many of my projects take too much time...

[@JG-iw8mh]

@@johnnyq90 I know the problem all too well.

[@CIBERXGAMING]

Just letting you know that the volume is very low.

[@RobertHellxKnightBrennan]

I love watching this stuff. It's like meditation.

[@ЕвгенийВасильев-м6з]

Делал я такую фигню. Очень громкая и визжащая штука, ось можно пальцами остановить. Мощности очень мало.

[@hyperhektor7733]

15:15 imagine a denist using that on your teeths xD

[@chamarystigers8731]

🦷🦷🦷🦷🦷🦷🦷

[@unitedspacepirates9075]

Is this a motor upgrade for the pocket NC? Maybe 2 dozen such turbines on the same shaft would have more power?

[@reobass007]

Очень интересный инструмент получился ! Браво мастеру ! Есть одно но для практического применения не выгодно так как пылесос потребляет много эл.энергии проще пользоваться обычным дремелем а так посмотреть было очень интересно.

[@КостянтинПоліщук-б6п]

А то что инструмент совмещён с пылесосом имеет свои плюсы, вся (почти вся) образующаяся стружка улетает именно в пылесос...

[@Razorbill_]

Они богатые и они могут платить за электричество. Это в раше невыгодно

[@Zima71084]

и вся образующаяся стружка влетая в лопасти рано или поздно(скорее рано) размолотит их или послужит образивом. при отломе лопасти возникнет дисбаланс и на таких скоростях ( судя по звуку 25-40 тысяч) будет жуткая трясучка . да и со шлангом от пылесоса в руке особо не поработаешь с мелочугой

[@drons6768]

Думаю если подключить компрессор эффект будет таким же. А где нибудь в поле, имея только баллон с сжатым воздухом инструмент незаменим

[@maZZor100]

@@Zima71084 тут то смысл по большей части в идее и выполнении:)

[@io504]

Awesome project, really well made. How much power does it output? Compared to a Dremel

[@GorKraon]

Since its powered by a 500W vacuum its definitely less than 500W, but even if its 50% efficient its more than a dremel i think. 'Course a 500W (2/3 hp) motor with a flex shaft would zoom right past this in pure power. Neat and all, but in terms of practicality low pressure air is pretty weak.

[@davey6024]

Level 100 engineer. Respect.

[@gothmansams]

You should send that to AVE and have him compare it to the Dremel version

[@jkmccollum3]

That was all I could think of while watching this.

[@richiieriich]

I need some thing made please let me know the if your willing to make and ship to me. Send your email if willing It is a turbine shaft that had a shaft rotating over a shaft. In other words two shaft one main shaft and a second shaft over that main shaft

[@lennicrafter8902]

Just use two tubes

[@1992djg]

Look up AvE he’s doing just that making parts for people on his 5 axis Cnc townpump cnc

[@KangUhe]

Awesome bro..

[@kohLeeDjocdja]

what is that, green liquid (min 12.29) ?...

[@mathieurehala]

I'm curious to see how blades looks after all your tests :') More seriously, i maybe you can add a soft filter that will stop all the big dust and prevent damages?

[@kingpin7610]

Me too

[@LBCAndrew]

You might want to make some sort of guard when using a thread milling cutter because you're going to have it catch one day and when it comes apart on you, its gonna be ugly. I had a similar bit shatter while using it in Bosch palm router with the base removed so it was basically how you were using this. Part skipped off my full face shield, another part went through two layers of sheet rock behind me and into the house, and another piece skipped out the open garage door never to be seen again.

[@franciscoblascogregorio5206]

Felicidades!! Tienes un gran nivel de maestría. He disfrutado mucho viendo tú trabajo. Saludos desde España.

[@punman5392]

You should mess around with Hydraulic motors!

[@G40bv]

Next project... a filter cap so it won't damage the blades. Awesome job

[@LordRaa]

If I might make a suggestion, maybe look into making a press for bearings and broaching? That would make for an entertaining video series.

[@RookieLock]

wow, looks like it works better than a Dremel, lol Great work buddy!

[@ronniel5844]

Awesome idea you are very sharp between the ears

[@obaijapan3474]

Friend, do you have a link to buy this CNC machine? I want to buy a machine like this

[@thegenerousdegenerate9395]

I call shennanigins. Thats a pretty sweet dremel attachment you got there. You can hear the motor. Not to mention the hose was curiously outta frame whenever it was doing work. I may be wrong but i don't think so. Turbines don't make much torque there just isn't enough rotating mass and as soon as the tool slows the air just passes through the path of least resistance. Turbines are great for moving air but are horribly inefficient the other way around. Theres a reason you can't go to the hardware stores air tool section and buy a turbine anything. You think dewalt, makita, snap on etc. haven't done their R&D? But youtube dude knocks it outta the park? I'm sure you'll be rich soon when you get offered for design. Lol

[@lazaglider]

Jealousy is a terrible trait to showcase in a public forum.

[@CASTSTONE]

A dremel needs speed more than it needs tork and a turbine can get hella fast on air. There are videos of people who get Tesla turbines to spin at 30k rpm, there's nothing unbelievable in this video. And tell me, why would Dewalt or Makita be interested about an inefficient design? Do you think they'd want to sell dremels with full sized vacuum cleaners dangling behind them? Do you think people would want to run dremels that use 1 to 2kW of electricity and produce 70 dB of noise?

[@thegenerousdegenerate9395]

@@CASTSTONE I'm guessing your reading comprehension isn't as sharp as it should be.

[@CASTSTONE]

@@thegenerousdegenerate9395 You're reflecting, clearly you're not able to understand my points and produce counter arguments.

[@brianbrewster6532]

9:44. Um, can you say GENIUS? I had to watch this a couple times to realize how this twin turbine was supended in place. [whispers secret in my ear]. "magnets". 15:10. [closing your eyes] Did anyone feel like they were at the dentist office? Okay, so basically, you created a very fancy vacuum cleaner-powered air chuck tool. Am I missing something here? Impressive lather work - that I'll grant you. But your shop tools look pretty pricey. Why not give us a tour of your equipment and their accompanying retail value. Excellent work!

[@Pascal_Robert--Rc_Creations]

You know that with a video like this, now you don't have a choice but to make it turbo engine?😎

[@Angel_the_Bunny]

This beats the hell out of that wimpy ass dremel vacuum tool!

[@yosoydeyarumal]

Well.... what's the point of using HIGH really high precision machines to make a drill for handicrafts???? (One that can be destroyed with some steel dust, you should have done the whole thing for a compressor, not for a vacuumcleaner).... Isnt it like going to the Porsche Factory in Germany to build a.... wood car???? Or a bike out of plastic???

[@anasmrright]

Wow, that thing really sucks.

[@homemadetools]

Interesting! If you want more views, feel free to embed your video on our homemade tools forum; looks like you're one of us :-)

[@nickwashburn723]

Why so much stickout on those tools? As a professional machinist hearing all that unnecessary chatter hurts my ears. My ONLY criticism of your work.. love your videos and your work. Truly jealous of you to have that little machine to play with at home. The machines I work on are amazing but I sure wish I had one at home to play with.

[@داودنظیری]

با سلام و عرض ادب و احترام ‌.میخاستم‌بدونم چرا برنامه بطور نسبتاً‌جزیی زیرنویس فارسی نمیشود؟.ومسعله‌بعدی‌اینکه‌.بنده‌میتونم‌بگم‌یکی‌ازببنندگان‌ودنبال‌کنندگان‌.این‌سری‌برنامه‌ها‌هستم‌.ولی‌هیچ‌وقط‌به‌سوعالات‌بنده‌توجعی‌نشده‌..مثلاً‌بارها‌پرسیدم‌که‌آیا‌آلمیچر‌۱۲‌ولت‌چگونه‌میتوان‌با.برق‌۲۲۰‌راه‌اندازی‌کرد؟.باتشکر فراوان

[@en2oh]

what were you thinking about when you designed a rotor that actually draws material through the rotor blades? On the one hand, it looks like it would automatically clean up after any operation you perform.... but as one of the other posts asked "I'd like to see a tear down after 1 month...." :) Great job on execution! Thanks for posting it. Doug

[@Acoustic_Theory]

You are the most meticulous person on Earth. Also, how about a compressed-air design?

[@tabriansyah8569]

my first comment just now, I want to ask a 12v dc dynamo like that, can it be changed to 220v ac, how many wires must be wrapped and what size, I think it's like an electric drill, the picture is like that, understand that I like the small ones, directly plug in the electricity without much component. what can you do, thanks.

[@5b4aezmarinoscyprus71]

Great machinability, but terrible idea. It's environmentally non friendly, 500w for this kind of use. Anyhow keep "milling" I learn a lot from you.

[@Z-Ack]

Youve effectively made a tool on your mill and lathe that does a job a lathe and mill will do better, quieter and more efficiently.. there is one signifigant personal benefactor here though, when doing work with it, there is no dust or shavings left behind, to the tools degredation unfortunately. But that idea alone is a great concept and as in turbines attached to airplanes and such, debris are accounted for naturally getting sucked inside. As is moisture constantly being condensed and pulled inside creating a vortex I wonder if a solution to this issue would be to add a lubricating oil atomising injector on the prestage of the turbine which could then be machined to have a pulsed spray designed to use the internal vacuum pressure to pull oil in and push out, keeping the bearings and fins clean. This is still applying an idea of a self cleaning and perpetually motivated by a single power train, the vacuum.. Then bragging rights can be advertised as efficient without having to use what usually would be the actual tool motor and attached vacuum dust collector both.. copy right it and trademark and glue a dewalt or mikwakee sticker on it, with their endorcement, and charge 350$ with a 35% personal commission per sale. Viable retirement envestment plan idea.. . ...maybe..

[@Stefatabor]

Extremely economical device 1000 W vacuum cleaner motor drives a 5 W mini drill. This kind of joke should make such films a waste of time watching.

[@sergey-technick]

На чпу столько времени делать какую то непонятную зверушку, чтобы ей потом в ржавых тисках шкрябать пеньки из цветмета? Давай зачётку!

[@nateb4543]

I am so jealous of your tools, ability to design and execute this. Wow

[@nathanscott1764]

Couldn't you made it where the tool worked using the exhaust of the shop vac? That way it wouldn't suck up anything that could mess up the turbines. It would also have the benefit of blowing the debris away from the work piece.

[@davidreynolds4684]

Think you could put my ex on that lathe? Shes definitely unbalanced and you did so good with the turbines. Just a thought. Honestly even uf you missed the mark a bit and hit grey matter it would be ok. Accidents happen.

[@haraldpettersen3649]

What is the price of such a machin, i'm in love with it (the Pocket NC V2-10). OOOOK, i found it on Google $ 6,000 🧐

[@BIGWIGGLE223]

That is a thousand times better than that P.O.S. that Dremel put out!!!! I've thought about making one that ran off of steam power. Or hydraulics!!!

[@lukamoric9300]

7:05 i thought porn wasnt allowed on youtube

[@rheccornbread1588]

Funny story i took a 12 amp vacum cleaner motor and thought hey this would make a hell of a fan for outdoors well never and i say never try that shit i put a metal fan blade onto it plugged it in and before i could unplug it all i had left of the blade was the center of it, it flew apart like a frag grenade into a milluon tiny pieces. Lol maybe a clutch fan from a car motor would work IDK. 😆

[@majorva2653]

The part i kinda dont like about this creation is, the moment when you grind all the chips and dust getting sucked right into the turbine wich causes quiet a lot of wear and friction in there... if you only work on softer materials than aluminium like wood plastic etc it wont be a problem i guess but... nah nvm i wouldve made another entry hole for the air instead... but great job at all

[@AlexSantos-db6fm]

kkkkk All this work for a drill cheap tool? A driill have 200W and this more than 100W for the same work. Really don't understand!

[@harleybmx9725]

Would be a dream to make stuff like this in my spare time, unfortunately lack of IQ and a 50,000 dollar machine has me stuck with a dremel and an unbalanced turbine 😂😂

[@brokenheart9997]

تعليقي هنا .هو هذا المحرك الرائع صحي للغاية..لان تيار المحركات يؤثر على الدماغ. احسنت صنع يا صاحب الدرع الذهبي.🥇🏆⛳

[@bgdavenport]

Exquisite work, but, ultimately, pointless since anyone can purchase an equally capable grinder from commercial sources.

[@Steelcrafted]

you should have reversed the direction of the turbine blades to work under positive pressure rather than suction....the you don't need to worry about debris, and the exhaust automatically clears your work of debris....

[@paigesmith6416]

Why didn't you build a combustion chamber ? That would make a really nice jet with a compressor and combustion chamber .. it would be a really cool rc boat engine ..

[@yasons9531]

Price of that cnc machine

[@travis4798]

Only thing I would have added is a cowel to the front of it to divert the intake. Don't want to be sucking up shavings through the turbine and chewing it up. Looks to be very effective!

[@Felix199393]

how did you cut dremel's terrible thread? I was able to 3DP the turbine and housing (not super safe but meh...) but no one in my area could cut that thread

[@dolij5]

maybe you could modify the design and make the turbine blades out of something more massive or add a balanced weight on the opposite side of the bit to create more rotational momentum? possibly a more narrow inlet and a few more stages to the turbine? I know that makes balancing more difficult, but I think it would make the device better at drilling