You've Never Seen a Cycloidal Drive Like This

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  • Опубликовано: 31 дек 2024

Комментарии • 143

  • @Cinema_Mechanics
    @Cinema_Mechanics  Месяц назад +6

    Flexispot Black Friday Sale! bit.ly/4eFbsdK (US)

    • @russellzauner
      @russellzauner Месяц назад

      wind this in the right way and this becomes a motor that doesn't need a reducer ;-)

  • @TracyNorrell
    @TracyNorrell Месяц назад +70

    I didn't hear "back drive" once!? RUclips videos about cycloidal drive gearboxes aren't complete unless the creator says back drive at least 5 times! 😂 Great video

    • @Cinema_Mechanics
      @Cinema_Mechanics  Месяц назад +12

      Back drive! ;-). But seriously at these reductions they aren’t so easily back driven.

  • @jeremybrouillard
    @jeremybrouillard Месяц назад +28

    I do industrial robotics for a living, keep the video flowing.
    Most people in the industry take the actual robot for granted.
    I am still there, 10 years in, wowed by the mechanical marvel a serial robot is.
    I am more on the software side of things. Building tools to program them better/faster.
    You will certainly have some nice challenges ahead when you get to the control, calibration, motion planning part.

  • @youngpaddy1
    @youngpaddy1 Месяц назад +21

    I always wondered how plumbuses were made.

  • @Rudmin
    @Rudmin 29 дней назад +5

    For suggestions, I would recommend considering your pressures angles. It looks like the lowest the pressure angle on your lobe is maybe 60 or 70 deg. These high pressure angles effectively multiply the contact stress on your lobes because to transmit any force circumferentially you end up squeezing radially with a much higher force. A higher eccentricity and smaller pin/roller ring will improve this.

    • @Cinema_Mechanics
      @Cinema_Mechanics  23 дня назад +1

      Much appreciate the comment and will definitely do some more research on the subject. Already found another academic paper that covers it. ;-)

  • @marius.ballot
    @marius.ballot 19 дней назад +3

    Just watched the entire channel in one sitting. Thank you algorithm

  • @alfredias801
    @alfredias801 Месяц назад +15

    Another interesting variation on the cycloidal drive is the compound cycloidal drive, where there are are again two cycloid gears, but they are attached directly, so without an inner ring. One of the cycloid gears has one lobe less than the other, very similar to how a compound planetary gear works. An advantage is that because it has no inner ring, it can be made very small and with very low part count

    • @OleBrouer
      @OleBrouer Месяц назад +1

      I love that type of cycloidal drive! I’ve actually managed to design and 3d print one that has an outer diameter of roughly 2cm and is fully print in place (its output is not useful and the whole thing is just for show) while still packing a 36:1 reduction!

    • @Cinema_Mechanics
      @Cinema_Mechanics  Месяц назад +7

      Stay tuned!!

    • @chadjensenster
      @chadjensenster Месяц назад +1

      Levi Janssen on RUclips talked about a compound cycloidal with a smaller inner cycloidal disk inside a larger cycloidal disk.

    • @electrowizard2000
      @electrowizard2000 Месяц назад

      ​@OleBrouer is it posted anywhere? Please share!

    • @OleBrouer
      @OleBrouer Месяц назад

      @@electrowizard2000 I just uploaded it to my Printables account (username Ole Brouër)

  • @aldrickpeter
    @aldrickpeter 20 дней назад +2

    i recently made a cycloidal drive for my final year project, it was a 2 stage 36:1. It was bulky. This seems interesting, i think imma give this a try.

    • @Cinema_Mechanics
      @Cinema_Mechanics  20 дней назад +1

      Definitely recommend it! I'll have more coming soon about the topic.

  • @polecat3
    @polecat3 27 дней назад

    This channel is an absolute gem

  • @contentnation
    @contentnation Месяц назад +3

    If it's possible to change the design a bit, the rotating parts seem almost 2D-like, so perfect for cutting on a simple 2.5D CNC machine or a water/laser cutter.

  • @thomaskletzl6493
    @thomaskletzl6493 19 дней назад

    I must say i skipped the video when it was uploaded. I didnt realised it was from your channel and only thaught wow another cycloidal drive. Today i thaught there was a long time until i watched a video from your channel. I cant say i am disapointed video is great

  • @makex_se
    @makex_se Месяц назад +7

    No, the video is not long enough. I WANT MORE POWAAAH!!!

  • @andyherle
    @andyherle 28 дней назад

    Just wanted to say, I really enjoy your videos man! keep it up

  • @DIYGUYChris
    @DIYGUYChris 22 дня назад

    You deserve more followers and more attention from this platform, I continously wait for your tutorials 😄#robotics #maker #mechanical

    • @Cinema_Mechanics
      @Cinema_Mechanics  20 дней назад

      Thanks so much for the kind words! And thanks for watching!

  • @chrisBruner
    @chrisBruner Месяц назад +2

    I love it when I see something that I hadn't heard of before.

  • @wertacus
    @wertacus 19 дней назад +1

    Im excited to see part 2 with laser cut steel discs

  • @austina4060
    @austina4060 12 дней назад

    Just watched all your stuff 10/10 channel you got here 😊

  • @guilhermebeccato2885
    @guilhermebeccato2885 21 день назад

    Hey would you be willing to post the cad? Im having trouble understanding the paper and would like to understand better

    • @Cinema_Mechanics
      @Cinema_Mechanics  20 дней назад

      I do plan on posting some of the cad in the near future. Stay tuned!

  • @keenheat3335
    @keenheat3335 Месяц назад

    what happen if both lobes count are equal ? you get a 0 at the bottom, does the output just not move anymore ? since effectively it's sitting at infinite gear ratio ?

    • @Cinema_Mechanics
      @Cinema_Mechanics  Месяц назад

      Yep! Exactly. The two would cancel out and you’d have no movement at the output shaft.

  • @herbertattema9890
    @herbertattema9890 Месяц назад

    Wow, super entertaining animation and original spin, thanks!

  • @jonnymeyer8572
    @jonnymeyer8572 Месяц назад +1

    You should give Fiberlogy CTE HT a try for your functional mechanical parts. Like PETG it is a co-polyester but has almost none of PETG's weaknesses. It prints exceptionally well in an enclosed printer and has no warping or dimensional issues. This stuff is accurate. It's also one of the most strong materials in the FDM world not just because of it's material properties but because of how cohesive it prints when you get your settings dialed in. Reach out if you need filament or print profiles. I print mine on a P1S but an X1C would be better because you can get the hotbed a lil hotter. If you want a similar material but with just a bit more flex, ColorFabb HT is of a similar composition to the Fiberlogy stuff but just a bit less strong. Still exceptionally good in terms of strength but especially the dimensional stability and print cohesiveness. Bonus, the temperature resistance of this stuff is some of the best you can get in an affordable material. Friction heating or heating from your motors will not be an issue with it.

    • @Cinema_Mechanics
      @Cinema_Mechanics  Месяц назад +2

      I’ve played with some engineering filaments over the years. Mostly CF-PC and while I’ve found that there are improvements. You still have to deal with plastic deformation. I haven’t played with any of the newer stuff yet though. Thanks for the tips!

  • @dnomyarg32
    @dnomyarg32 Месяц назад

    I really enjoy your videos. You asked for improvement ideas, and I would love to see you have a go at machining the disks in aluminum on your cnc. That’s one of the big advantages of cycloidals over other high ratio drives like strain wave, planetary, pinwheel worm drives, etc. They can be easily machined on a 2.5 axis system. Even a hobbiest cnc should give better tolerances in aluminum than a 3d printer in plastic, reducing or eliminating backlash and the stuttering. The load bearing will be far greater, improving the torque. And the stiffness will be much greater, reducing the hysteresis. If your little cnc is up to the task, that would be really cool to see.

    • @Cinema_Mechanics
      @Cinema_Mechanics  Месяц назад +2

      @@dnomyarg32 yep would love to cnc one up in the near future. Definitely gonna have to get those tolerances tight though.

    • @dnomyarg32
      @dnomyarg32 Месяц назад

      @Cinema_Mechanics with 3d plastic I doubt your profile tolerance is much better than +/- .1 mm. I imagine your cnc should be able to do better. Maybe a lot better.

  • @wesleyturner6424
    @wesleyturner6424 Месяц назад

    im absolutely interested if you can make a compound cycloidal with this same style and have the inner and outer pinstack spin separate smaller within the larger i would be amazed if that would work, honestly cant follow the forces in my head so im struggling to work it out

  • @gustavobastosbarbosa1391
    @gustavobastosbarbosa1391 Месяц назад

    Hope to see more of your work.

  • @coledavidson5630
    @coledavidson5630 Месяц назад

    Doesn't having a different number of lobes make them not perfectly counterbalance each other? Or do they just need to have the same mass?

    • @electrowizard2000
      @electrowizard2000 Месяц назад +1

      Speed and mass moment of inertia would need to match. Mass and lobes can differ, you'd probably have to shift around the "speed holes" to compensate. (I agree that mass is probably very similar to achieve this)

  • @rudycandu1633
    @rudycandu1633 Месяц назад +13

    If you have a CNC, then make the deforming parts out of metal.

    • @TuckerSmith-xm8es
      @TuckerSmith-xm8es Месяц назад +3

      I’m expecting that to be the subject of, or at least included in, a future video

  • @Grayswandiir
    @Grayswandiir Месяц назад +7

    I always love your videos, and im certainly not a medical professional, but your fingers look really clubbed. I could be wrong, but RUclips cant afford to be losing promising new creators these days!

    • @gonzog8d
      @gonzog8d Месяц назад +1

      I was going to make the same comment. Hopefully it's just genetic, and if not he already got it checked out.

  • @bryanst.martin7134
    @bryanst.martin7134 Месяц назад

    Fiber reinforced PETG? Not carbon as it increases wear. The Oscillation was present at 1st run, and progressed? At 1st I thought too little torque from the brushless. Maybe friction played a big part?

    • @Cinema_Mechanics
      @Cinema_Mechanics  Месяц назад +1

      The stuttering I’m pretty sure comes from a lack of precision in the 3d printed parts. Motor if anything is oversized for the reducer. It gets worse because the cycloid starts to get out of shape.

  • @stimpyfeelinit
    @stimpyfeelinit Месяц назад

    very cool, should put a regular cycloidal drive with the same ratio next to it to show the improvement

  • @nathantripp9134
    @nathantripp9134 Месяц назад

    Looking forward to your follow up(s). Thanks for sharing, cheers!

  • @MakerGeek
    @MakerGeek Месяц назад

    One of these days I'm going to have to try one of these, as you say, everyone waxes lyrical about their advantages. for my robot arm I'm using a couple of 3 stage planetary gearboxes which I setup with 4 planets per stage to help with the teeth contact area thing. steel pins through the planets connect the output plates. I've had some decent success with around 50Nm of torque. they're pretty big though, and certainly the sun gear at each stacked stage is a week link. Do you think the stuttering movement you got was purely from the deformation of the plastic gears? I assume that was petg?

    • @Cinema_Mechanics
      @Cinema_Mechanics  Месяц назад

      Yeah definitely recommend at least playing around with them. The stuttering comes from a lack of precision with the parts. For example if the shape is slightly off you can get tight spots and loose spots. Then as the disk deformed under load it got much worse. Using larger diameter rollers and longer rollers would have helped with this issue a lot.

  • @jeremybrouillard
    @jeremybrouillard Месяц назад

    Another great video!
    The amount of math was just right for most ppl I think!

    • @Cinema_Mechanics
      @Cinema_Mechanics  Месяц назад

      Glad you think so. I had concerns.

    • @jeremybrouillard
      @jeremybrouillard Месяц назад

      It showed!
      I would have taken more, but I think it was plenty for most.

  • @Ai_praxis
    @Ai_praxis 15 дней назад

    Clubbing on the finger nails, hope you are well brother, your talents are inspiring

  • @sovahc
    @sovahc Месяц назад

    With the help of wire-edm, it is possible to cut such flat parts from very hard metals. I'm going to try it. As soon as I build the WEDM. 😁

  • @Max24871
    @Max24871 Месяц назад

    Would love to see you release those design files in your upcoming video :)

  • @glych002
    @glych002 28 дней назад

    You should see a doctor about your fingers
    1. Clubbing:
    • This is when the tips of the fingers and nails become rounded and swollen.
    • Often associated with chronic low oxygen levels due to conditions like lung diseases (e.g., COPD, lung cancer), heart problems, or liver disease.

  • @anon_y_mousse
    @anon_y_mousse Месяц назад

    Neat. Any plans to make the whole thing out of metal and is this going into the robot arm?

    • @Cinema_Mechanics
      @Cinema_Mechanics  Месяц назад +1

      I’m using off the shelf harmonic drives for the arm. But have other planned uses for this design in the future.

  • @stefanguiton
    @stefanguiton Месяц назад

    Great work as always

  • @revotrades3020
    @revotrades3020 28 дней назад

    amazing. only disapointing bit was the ending. feels like an unfinished experiment.

  • @TheNadOby
    @TheNadOby Месяц назад

    Nice one gonna check this one

  • @fatihmeral9863
    @fatihmeral9863 Месяц назад

    The video is short, if not the v2,, at least we would like to see the performance of the CNC machined version

  • @NathanDavidDodd
    @NathanDavidDodd 13 дней назад

    I spent a few years designing and testing cycloidal drives. This design will be nearly the worst torque ripple and non-linearity you can imagine. The multiple identical disks is the only way to average those out. But this design deletes that feature and there is no way to correct it in open loop control. SO its doomed from the beginning.
    Secondly, the differential type of gear reducers. like this, or a planetary wolfram drive, is the worst as well for constant ratio. Because if the ratio of 1 of the stages changes even a miniscule amount, the multiplication of the end ratio is changed much more than a simple 2 stage gearbox without this differential feature.
    3rd. driving the disks with the output hub is much more difficult (to do smoothly) than driving the output hub with the disks like a normal cycloidal drive.
    I do really like the topic and your video was great. Just don't waste too much time on this. There is a reason nobody uses it, typically. If it is useful , Harmonic drives Inc. or Sumitomo buys them out and puts it in a drawer. True story.

    • @Cinema_Mechanics
      @Cinema_Mechanics  11 дней назад

      Thanks so much for the thoughtful reply! I think I'm already seeing a bit of what you're predicting. I'll probably still play around a bit with the design anyway as I think it's valuable learning (for me anyway).

    • @NathanDavidDodd
      @NathanDavidDodd 11 дней назад

      @@Cinema_Mechanics well you video was absolutely great. I could go for another.
      Let me know if you want to chat about cycloids. Maybe we could each learn a thing or two. I know I would. I have been down the rabbit hole with this.

  • @ItsBoyRed
    @ItsBoyRed Месяц назад +1

    Hey man, just a heads up, but you may want to consult a doctor about your fingers, it looks like you have mild clubbing which could be a sign of lung or cardiovascular issues.

  • @chopper3lw
    @chopper3lw Месяц назад

    NICE!!!!! That's so nifty

  • @jakeengland1430
    @jakeengland1430 Месяц назад

    Have a look into howimat reducers

    • @Cinema_Mechanics
      @Cinema_Mechanics  Месяц назад

      Oh I absolutely love that. Really interesting design. Almost a hybrid between harmonic drive and cycloidal.

  • @regun2434
    @regun2434 Месяц назад +1

    Ah more video!

  • @Vez3D
    @Vez3D Месяц назад

    Love it❤

  • @Romeo_the_wise-
    @Romeo_the_wise- Месяц назад

    I would like to see this Cycloidal Drive paired with a small drone motor to power an electric bike

    • @TankR
      @TankR Месяц назад

      While speed and torque can be exchanged, power is absolute. A watt is a watt no matter what. If it takes say 5 watts to accelerate and maintain a mass at a given speed, and you're not putting at minimum 5 watts into the system (which youll of course have to input more than that for frictional losses in the bearings and contact points, plus rolling resistance, air resistance, etc) there is not enough energy (ie, power) to accelerate the mass to the speed. You can use that 5 watts to spin something light really fast, or you can use that 5 watts to lift something heavy slowly, but 5 watts is all you have. In physics, there are no free lunches.

  • @luisca92
    @luisca92 19 дней назад

    STEP files for the community to tinker?

  • @hikolanikola8775
    @hikolanikola8775 Месяц назад

    Thats old..... 2011... i think there is more potention in a Split-ring compound epicyclic/planetary gearboxes

  • @ezraanderson842
    @ezraanderson842 Месяц назад

    love it

  • @UNVIRUSLETALE
    @UNVIRUSLETALE Месяц назад

    I think the parts could easily be lasercut for better strengt of the materials

  • @nitrouspeed3583
    @nitrouspeed3583 26 дней назад

    Drive the other side and I see a super duper beyblade launcher

  • @ThePSYBORG
    @ThePSYBORG Месяц назад

    Amazing

  • @Lyle-In-NO
    @Lyle-In-NO Месяц назад

    This channel has less than 13K subs. How'd you get an adbertiser so soon? You must have another channel/product out there somewhere already.

  • @Baroque_Back_Mountain
    @Baroque_Back_Mountain Месяц назад

    This is similar to a Gerotor, which, i think is part of a helicopter’s fuel pump system.

  • @russellzauner
    @russellzauner Месяц назад

    whoa...this means a rotary engine is a three lobe cycloidal

  • @chrismayer8990
    @chrismayer8990 Месяц назад

    I fear that the ball bearings have too much play. At least if you want to achieve a high level of precision.

  • @sobertillnoon
    @sobertillnoon Месяц назад

    Ya get less wobble with 3 discs 120° apart.

  • @deltacx1059
    @deltacx1059 Месяц назад +22

    This guy does not sound like he wants to be here.

    • @AHustleIsLikeASideOfFries
      @AHustleIsLikeASideOfFries Месяц назад

      Yep, I could only listen to half the video. And just when you thought sever vocal fry was the hardest thing to listen to… 🤢

  • @TheOneAndOnlySatan
    @TheOneAndOnlySatan Месяц назад

    The modern way to summon me

  • @twitchlazy
    @twitchlazy Месяц назад

    im not a doctor or anything, but you may want to have them check your heart and lungs. It looks like your fingers have clubbing. Thanks for the video.

  • @medienmond
    @medienmond 29 дней назад +1

    Make it metal

  • @theenchiladakid1866
    @theenchiladakid1866 Месяц назад

    I have one

  • @rubenverster250
    @rubenverster250 Месяц назад

    A good speaking hint for you
    Take it or leave it
    Try to use a lower pitch at the end of a sentence
    Increasing the pitch of your voice at the end of every sentence is a no-no

  • @ferriswhitehouse1476
    @ferriswhitehouse1476 Месяц назад

    switch to carbon fiber ASA filament and that thing will be able to lift the whole gym. top notch video and design skills as always 👏

  • @squa_81
    @squa_81 Месяц назад +2

    My favourite bored mechanical engineering narrator comes back with another extremely interesting topic!
    Who knows where I'll use it? Is it going to be a 20°K mechanical testing machine? Will it end up doing anything for hydrogen tanks? I certainly don't know anything else other than that cycloidal design is a very potent and interesting design :D

    • @AHustleIsLikeASideOfFries
      @AHustleIsLikeASideOfFries Месяц назад

      Ugh, I cannot listen to his voice for very long without wanting to claw my eardrums out. It’s a very bored and disinterested cadence that follows the exact same pattern over and over and over. I could only listen to half of the video unfortunately

  • @theMGKPL
    @theMGKPL Месяц назад

    uh maybe it's good deep dive but it's nothing new, we used that concept from paper for years with 3d printed gearboxes all over the world :/

  • @MarcinKrukar
    @MarcinKrukar Месяц назад

    With such a ratio I do not predict any success, but if you are Polish, 40:1 is doable ;)
    ruclips.net/video/epeQwq-aYV0/видео.html
    I'm looking forward to the next parts, great job!

  • @ft.moder001
    @ft.moder001 Месяц назад

  • @claytonsingh
    @claytonsingh Месяц назад

    This reminds me of a split-ring epicyclic planetary gearset
    ruclips.net/video/4gkbb2CBzQI/видео.html

  • @AlexAnder-fo7ed
    @AlexAnder-fo7ed Месяц назад

    Professional advice: don’t use plastic gears

  • @attilafilmhouse6345
    @attilafilmhouse6345 Месяц назад

    :) showman

  • @chadjensenster
    @chadjensenster Месяц назад

    Dude made a bunch of metal dowel pins when you can buy them over the counter.😂 Also, I second making any defirmed parts out of metal as other commentors have said. You have a cnc mill, you've proven the design with 3d printed parts, now you can justify the time and expense to make them out of metal. Not sure I would make them out of aluminum though. They are small enough, the extra weight steel would add would be insignificant

    • @Cinema_Mechanics
      @Cinema_Mechanics  Месяц назад +1

      Well I mean I cut them. From a precision rod. Wasn’t actually that big a deal. Not sure where you buy individual pins at exactly the right length you need but sounds like a handy place!

    • @theavaliengineer
      @theavaliengineer Месяц назад

      ​@@Cinema_MechanicsYou can't usually buy at exactly the right length, but you can certainly design for COTS parts from the get-go :P

  • @bregbarega3717
    @bregbarega3717 Месяц назад

    I think requirements for an industrial robot isn't changed from what our ancestors set ages ago :D Rigidity first. Imagine that all our motors are stopped, firmly, they could be removed and the inputs could be welded. Now imagine that you grab the end of your 1,5 meter long robot arm and yank it. Does it moved more than 1-2mm? An industial robot would be like a stone in this case, rigid as f___, so when I'm planning a robot arm I start with the thinking of where is it gonna move when all inputs are locked.
    For example 1 meret long robot arm, with 3kg payload plus the mass of the arm itself, we can count for at least 10kg of moving mass, which is about 100Nm when it's extended horizontally (and stationay!) When it moves, and we want to stop it fast horizontally, it can easily doubles that, plus safe margin. So that's the mindset of which all DIY robot creators should think when it comes to sizing their parts. ;)

    • @Cinema_Mechanics
      @Cinema_Mechanics  Месяц назад +1

      But you gotta also move it somehow! Great points though.

    • @bregbarega3717
      @bregbarega3717 3 дня назад

      @@Cinema_Mechanics Hi! I hope you're doing well :) and so the project! I hope i didn't scare you off or discourage you, I didn't meant to. I just wanted to say don't afraid of sizing the parts bigger, larger, beefier ;) We are not Kuka or Fanuc but with a machine shop like this you can achieve similar results with a little bit bigger parts, lager diameter joints, etc. than an "official" robot with the same span. And the robot will be perfectly fine. Function will dictate the form :)

    • @Cinema_Mechanics
      @Cinema_Mechanics  2 дня назад

      @@bregbarega3717 haha Nope still plugging away! Just been busy trying to juggle all the projects while making videos! I love the thoughtful critiques. It's how I learn when I'm being a bone head.

  • @sebleblan
    @sebleblan Месяц назад

    It looks like your fingers are clubbing, do you have a heart condition? Sorry for the comment.. I hope you're fine :)

  • @docdailey
    @docdailey 24 дня назад

    do you talk through your nose?

  • @Xx32123
    @Xx32123 Месяц назад

    your printer SUCKS!!! GET A BETTER ONE

    • @Cinema_Mechanics
      @Cinema_Mechanics  Месяц назад

      Haha. Maybe someday. It looks grungy but still working pretty well.

  • @jones7399
    @jones7399 Месяц назад

    I feel like this guy doesnt have his intonation finetuned lmao

  • @A3Kr0n
    @A3Kr0n Месяц назад

    Thanks for the condescending title. I'm really sick of all the things I've never seen, all the things I've never heard of, and all the things I thought I knew that were wrong. Thanks again.

  • @RogierYou
    @RogierYou Месяц назад

    Is his t-shirt a pro Trump maga?

  • @3dkiwi920
    @3dkiwi920 Месяц назад +1

    The cadence makes this impossible to listen to.

    • @Cinema_Mechanics
      @Cinema_Mechanics  Месяц назад

      At least it’s not AI! 😢

    • @ThatFunnyGuyXx
      @ThatFunnyGuyXx 25 дней назад

      @@Cinema_Mechanicsit sounds worse…. It reminds me of the text to speech from those old school testing programs. 😬🙃

  • @AHustleIsLikeASideOfFries
    @AHustleIsLikeASideOfFries Месяц назад

    Great content, but have you ever been told your style of talking is difficult to listen to? You know how severe vocal fry is like fingernails on a chalkboard? This is nearly as bad, you speak in the exact same pattern over and over and over. It also gives the impression that you’re disinterested in the topic. Thought you’d want to know…

    • @Cinema_Mechanics
      @Cinema_Mechanics  Месяц назад

      I have now. Thanks for the valiant effort in getting through it. ;-).

  • @mariohernandez1111
    @mariohernandez1111 Месяц назад

    Why is your intonation like this? It's pretty distracting

  • @ScienceMessiah
    @ScienceMessiah 25 дней назад

    Off topic.. but I noticed serious so called clubbing with your finger nails, which can indicate a problem with your heart.
    If you haven't done so yet, go see a doctor to get checked.