Create Custom 3D Printable Gears in Fusion 360 | Practical Prints #1

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  • Опубликовано: 23 янв 2025

Комментарии • 350

  • @ProductDesignOnline
    @ProductDesignOnline  5 лет назад +22

    The series playlists can be found here. All future episodes will be added ➞ bit.ly/practical-prints
    __
    TIMESTAMPS
    0:00 - Custom 3D Printable Gears in Fusion 360
    0:57 - Accessing the gear add-in
    3:06 - Pressure Angle
    3:40 - Pitch Diameter
    4:14 - Module
    4:40 - Backlash (clearance)
    5:12 - Root Fillet Radius
    5:43 - Gear Thickness
    6:07 - Hole Diameter
    8:30 - Creating the second gear
    9:33 - Creating the base component
    13:17 - As-Built joint
    14:05 - Adding a motion link
    15:47 - Subtracting material from gears
    18:11 - 3 Tips when making gears

    • @DrRed2x
      @DrRed2x 5 лет назад

      hi i am vikas , you i am happy you have 26k subs 😄😄😄😄😄😄

    • @ProductDesignOnline
      @ProductDesignOnline  5 лет назад +2

      @@DrRed2x Thanks for your continued support, Vikas!

    • @DrRed2x
      @DrRed2x 5 лет назад +1

      @@ProductDesignOnline no problem i will keep supporting you because its worth it

    • @DrRed2x
      @DrRed2x 5 лет назад +1

      @@ProductDesignOnline where do you live i am from india

    • @ProductDesignOnline
      @ProductDesignOnline  5 лет назад +1

      @@DrRed2x I'm in the USA

  • @skywower694
    @skywower694 4 года назад +71

    This guy is a legend putting these all out for free.

  • @asudavew
    @asudavew Год назад +6

    I watch a LOT of your videos and boy do they help. I had zero experience with 3d printing and CAD programs. I just wanted to thank you for your time and effort. You are a great teacher and a master of Fusion!

  • @IceCreams62
    @IceCreams62 5 лет назад +92

    Yes, i'm interested in more gear tutorials

    • @ProductDesignOnline
      @ProductDesignOnline  5 лет назад +12

      I'll definitely do more :)

    • @Winacro
      @Winacro 4 года назад

      #metoo

    • @racylaserjet
      @racylaserjet 4 года назад +2

      @@ProductDesignOnline gears where the spurs are on the inside of the cylinder instead of outside. I imagine you could just do the above and subtract from another part but just in case there is an easier way. Please and thank you.

    • @mikenewman4078
      @mikenewman4078 4 года назад

      I'm quite interested in gears (including planetaries and compound epicyclic), sprockets and toothed pulleys. They would eventually be machined from metals, probably from home cast blanks unless steel is required.
      Thanks.

    • @ricetv942
      @ricetv942 3 года назад

      I am

  • @roywlogan
    @roywlogan 5 лет назад +71

    I would love to see a video showcasing the many types of 3d printable plastic joints, bends and snap-fit designs.

    • @ProductDesignOnline
      @ProductDesignOnline  5 лет назад +16

      Love the idea, Roy. Thanks. I've added these two my list of video topics for the series. Cheers, Kevin :)

  • @Wintergatan
    @Wintergatan 3 года назад +30

    super tutorial

    • @sebenicz5213
      @sebenicz5213 3 года назад +2

      oh hi Martin, learning how to make some friends for Willson? :D

  • @N3ss3s
    @N3ss3s 3 года назад +7

    I gotta say Kevin, this is maybe the best quality fusion tutorial series out there. I am learning so much and gaining confidence in starting to build a business around CAD. Thanks man.

  • @vileguile4
    @vileguile4 4 года назад +4

    Hey Kevin! I did episode 1-11 on your Skillshare series and while i haven't had time to continue further yet i have become an absolute pro designing for my 3d printer! Ok, not absolute pro but i can basically make anything i can think up. The hardest part is constraints. I'll have watched those episodes a few times and need a few more.. :) Anyway, thanks for the teaching. 3d-printing has become a huge part of my free time now. The best parts i've made is to make connectors between hoses and wood working machines. Inside and outside spirals to match the hoses and then different friction fits for the machines. I carry a calipher wherever i go now :D Thank you!!

    • @ProductDesignOnline
      @ProductDesignOnline  4 года назад +1

      Glad to hear that! Best of luck with all your 3D printing projects 😎

  • @Talhakhan-ov3wi
    @Talhakhan-ov3wi 4 года назад +3

    I always recommend this channel to my beginner friends, really love it. It will further good if you make car and aircraft parts in your tutorial.Thank you

  • @benhessner5869
    @benhessner5869 4 года назад +1

    An inspiration to watch this. The best I have seen on both Spur Gears and Motion Links.

  • @renxula
    @renxula 3 года назад +35

    Interesting video! Just one thought: you guessed 11.3 degrees for turning the smaller gear, but it seemed clear to me that it needs to turn exactly half a tooth. There's 16 teeth, so half a tooth is 360°/16/2 = 11.25°, which seems to agree with your guess/experiment :)

    • @JohnVanderbeck
      @JohnVanderbeck Год назад +2

      yeah not exactly complex math so not sure why he guessed.

    • @Flaviongas
      @Flaviongas Год назад

      how did you know that it needed to turn exactly half a tooth? is there like, a formula?

    • @renxula
      @renxula Год назад +2

      @@Flaviongas If two gears' teeth overlap head-on exactly, it's always half a tooth you need to rotate by. That brings a gap to exactly where a tooth used to be.

  • @airwavested
    @airwavested 5 лет назад +2

    Thanks again Kevin.
    Yet another excellent tutorial.
    I hadn't looked at the Add-Ins before but I'm interested in learning more
    And I really appreciate how you present these topics in a clear, comprehensive and easy to digest way.

    • @ProductDesignOnline
      @ProductDesignOnline  5 лет назад

      Thanks, Airwaves Ted! There are several add-ins and scripts that are worth checking out. I will probably start to cover a few more of them (At least the ones I use regularly)...except some of them don't need a full-on video. Cheers, Kevin :)

  • @turnswood
    @turnswood 3 года назад

    Finally... got a working design after following a lot of lesser instructions. I did have a problem using the gear's parameter circle as an offset. It was greyed out for the selection. Instead, I just drew some circles from the center and followed those with spokes. Thanks, Kevin. Irv in Florida

  • @shaunmorrissey7313
    @shaunmorrissey7313 5 лет назад +7

    More please😀 I've said it before, I'll say it again, you make it look so simple😀. I really enjoy your videos

  • @bhein67
    @bhein67 4 года назад +2

    This was the second tutorial I watched. I am attempting to work along with you as you build the project. This was a challenge toggling back and forth between youtube and fusion. I'm certainly going to do this one again, hopefully I can set up with two computers.
    I really enjoy your approach and how you are explaining as you go. It is certainly a stretch for me, but, I will keep plodding along.
    Thanks again.
    btw, I have subscribed to your channel (and if I can figure the patreon thing out I'll buy you a coffee...LOL)
    Cheers from Canada

    • @ProductDesignOnline
      @ProductDesignOnline  4 года назад +2

      Thanks! Glad to hear you're learning and enjoying them. Two monitors definitely helps :)

  • @TheKverbeeck
    @TheKverbeeck 4 года назад

    Thx again Kevin, for all the work you put in making these videos/tutorials, I recommend this channel as one in my Top 3 for learning Fusion 360.

  • @brianspoelman3195
    @brianspoelman3195 3 года назад

    This was so much fun to follow your tutorial step by step and end up with working gears at the end! Now I can really say that I'm a gearhead, at least a virtual one!

  • @HaiTHaMKoBeIssI
    @HaiTHaMKoBeIssI 5 лет назад

    making gears is so simple with your clear explanation, thanks for the video.

  • @FallOfInsanity
    @FallOfInsanity 3 года назад +1

    I've been searching for a tutorial like this for a minute. THANK YOU SO MUCH for creating this, as a complete beginner to CAD programs this was an easy to follow introduction to EXACTLY the kind of thing that I was looking for. Making gears in any CAD seemed intimidating, and animating it even more. Your tutorial helped boost my confidence and make the whole CAD process much more approachable!
    Again, thank you.

    • @ProductDesignOnline
      @ProductDesignOnline  3 года назад

      Glad to hear that. Keep learning and best of luck with your projects! :)

  • @Maxpayam22
    @Maxpayam22 3 месяца назад +2

    Thanks for this great tutorial. For me however it'll work untill I try to "add a motion link" at minute 14.08. I can't get it to animate the motion, which is a pity.

  • @drewnorthcott6268
    @drewnorthcott6268 3 года назад +1

    Excellently laid out, super clear, really well made and thought through with the linked (web) materials. Great tutorial.

  • @MegaCadr
    @MegaCadr 4 года назад +1

    This is gold. Please more gear videos!

  • @ToddRafferty
    @ToddRafferty 3 года назад

    Thanks for these videos. I did my first ever fusion 360 parametrized print recently and I think that means I'm starting to "get it" thanks to your tutorials.

    • @ProductDesignOnline
      @ProductDesignOnline  3 года назад +1

      Glad to hear that, Todd! Using parameters can make a big difference...especially for those projects that need different sizes/outcomes :)

  • @mattdrat3087
    @mattdrat3087 4 года назад +1

    Excellent tutorial, I will try my hand at gears this week! Thanks for sharing!

  • @admugetsu
    @admugetsu 2 года назад

    Dude, I just love your tutorials

  • @scienceofart9121
    @scienceofart9121 2 года назад

    This tutorial was so on poınt I did everything I can to support you. Thanks for this amazing materials and I hope you will continue doing these

  • @ovlv1518
    @ovlv1518 Год назад

    Amazing video! Your process and explanation is amazing!

  • @bonboiio5198
    @bonboiio5198 5 лет назад

    This video couldn't have come out at a better time for me!!!

  • @LL-vt3is
    @LL-vt3is 4 года назад +1

    Thank you for your tutorial as always. On 12:05 when you are going to create the riser, I got the plane wrong and can not figure out anything to change it except using Ctrl+Z. May I know how do we change plane on offset? Thank you.

    • @petermcrory5194
      @petermcrory5194 4 года назад +2

      I was having issues with this part and realized I needed to click on the face of the body rather than the orange plane, this allowed the offset to expand from the body instead of the tops of the risers. Hope this helps someone.

  • @zaida.sideeq7921
    @zaida.sideeq7921 4 года назад

    I love to learn more about gears and printing them specially as a replacement parts.

  • @klauskurt2901
    @klauskurt2901 5 лет назад +1

    Very well explained, more complex gear tutorials would be great. Thanks!!!

    • @ProductDesignOnline
      @ProductDesignOnline  5 лет назад +1

      Thanks, Klaus! I will definitely try to do more gear tutorials with various types of gears. Cheers, Kevin :)

  • @AlexisCarrera
    @AlexisCarrera 4 года назад +3

    I can learnt a lot about fusion 360, thanks! :D

  • @dandgarciaihht6514
    @dandgarciaihht6514 5 лет назад +1

    new series right on Kevin keep on making great videos.

    • @ProductDesignOnline
      @ProductDesignOnline  5 лет назад

      Thanks, Dand Garciaih HT! I appreciate your continued support :)

  • @dailydaisydog
    @dailydaisydog 4 года назад

    I love your videos and teaching style!! It's my favorite fusion tutorial on RUclips!

  • @somedude1129
    @somedude1129 3 года назад

    Not sure if you offer specific help, but I am having trouble cutting out the interior of the gear. When I try to extrude/cut the interior, I can't select only the area outside the lines, I am only able to select the entire face of the gear inside the circle I drew earlier. Its like the spokes I drew aren't registering? I can see them but I can't select only the area inside. (I am referencing around 16:55 in the video). Thank you.

  • @OwenWithAHammer
    @OwenWithAHammer 3 года назад

    Incredible video, my favorite Fusion 360 tutorial so far!

  • @scottgriz
    @scottgriz 4 года назад +8

    This was an absolutely amazing tutorial. I learned so much doing this one. Thanks for doing it.

  • @herarmisnice
    @herarmisnice 4 года назад

    Thank you so much!! you helped my school assignment!!!!

  • @MadelnOahu
    @MadelnOahu 4 года назад

    Dude, your tutorials are legendary!! Keep up the great work!

  • @rjlatheart
    @rjlatheart 5 лет назад

    K, you did it again!! Thank You. It will be great to see the future gear projects. This is gonnnnna be a fun one. Some kind of simple transmission will be fun to see and use. Happy New year!!

    • @ProductDesignOnline
      @ProductDesignOnline  5 лет назад

      Thanks, Rich! I hope your new year is off to a great start!
      I will definitely be doing more projects (something more functional) with gears in it. Cheers, Kevin :)

  • @JasonBolte
    @JasonBolte 4 года назад

    Great video. I have to admit I got lost part way through. I'm going to keep working at this. Thanks for posting great content.

    • @ProductDesignOnline
      @ProductDesignOnline  4 года назад

      Thanks, Jason. Let me know what part(s) where challenging for you.

  • @iceman71625
    @iceman71625 2 года назад

    Dude your the man and i think fusion is easier to use.... Ty for your time and educational information your sharing🎉🎉🎉🎉✌👋✌👋👋👋🙏🙏🙏🙏

  • @kenchang3456
    @kenchang3456 5 лет назад

    Thanks Kevin, this is a great idea for a series.

  • @crumpet_
    @crumpet_ 4 года назад

    definitely more gears! Fantastic vids Kevin

  • @majicMix911
    @majicMix911 3 года назад

    Gears are so much fun!

  • @Shabazza84
    @Shabazza84 2 года назад

    Game changer. Nicely explained.
    EDIT:
    Just printed this gear"box" and works flawlessly. I have ideas....

  • @cbbosse
    @cbbosse 5 лет назад +1

    Great tutorial! Your videos are much appreciated, please keep them up!

    • @ProductDesignOnline
      @ProductDesignOnline  5 лет назад

      Thanks, Catherine! No plans on stopping anytime soon... thanks for your support! Cheers, Kevin :)

  • @arthar360
    @arthar360 6 месяцев назад

    At 13:10 the ground option is now changed to "Ground to Parent". It complains about the position of the base if it has been moved after creation. Is there a simple Ground option hidden somewhere ?

    • @ProductDesignOnline
      @ProductDesignOnline  6 месяцев назад

      The original ground was renamed "Pin". Use that as seen in the tutorial and you will be all set.
      You may need to "unground from parent"

    • @arthar360
      @arthar360 5 месяцев назад

      @@ProductDesignOnline Thanks a lot

  • @mcprooo6843
    @mcprooo6843 4 года назад +1

    Plz create a complex gear design tutorial .... I love your videos they help me alot in my designs😊😊.

  • @Ralphhhy
    @Ralphhhy Год назад

    I tried following your tutorial but I keep getting stuck at 10:24 after following the Tangent guide. Somehow I am not able to select the points from the gears just like in the video. Then when I extrude the base with the 3 mm offset, my results is always upside down.

  • @amessman
    @amessman 3 года назад

    Good tutorials like this are few and far between, thank you!

  • @Know-Way
    @Know-Way 4 года назад

    Very well explained. Thank you.

  • @karlfimm
    @karlfimm 4 года назад +1

    Great video. Some good tips.

  • @g.s.3389
    @g.s.3389 5 лет назад +9

    great video, more about gears, maybe also including a simple motor.

    • @ProductDesignOnline
      @ProductDesignOnline  5 лет назад

      Thanks, Giuseppe. I will definitely do more tutorials with different gear projects/types. Cheers, Kevin :)

  • @QuantumRads
    @QuantumRads 4 года назад +1

    16:48 I followd you exactly and I am unable to select the 4 sections of the gear, it only selects the whole face...

    • @ProductDesignOnline
      @ProductDesignOnline  4 года назад

      Did you create the circle? All four profiles will need to be fully-closed in order to select them.

    • @QuantumRads
      @QuantumRads 4 года назад

      @@ProductDesignOnline Yeap, I created both circles and attached the lines, but for some reason it won't select each individual face.

  • @BeefIngot
    @BeefIngot 5 лет назад +10

    A gearbox would be cool. Something like a the 2 speed gearbox one might find on a drill.

    • @ProductDesignOnline
      @ProductDesignOnline  5 лет назад +3

      Great idea! I've added this to my list of video ideas for the series. I appreciate the comment. Cheers, Kevin :)

  • @andaluspc
    @andaluspc 4 года назад

    3D printing design learner is hear. :)
    Awesome tutorial. Thank you very much.

  • @williammcdonald9086
    @williammcdonald9086 16 дней назад

    You talk about possibly having to go back and edit the Backlash numbers, but I cannot find any way to get back to the Spur Gear dialog box to change that value. Any pointers?

  • @iceman71625
    @iceman71625 2 года назад

    Love to see more gear videos as i use to help build my rc stuff😁😁😁🙏🙏👋👋👋👋✌✌✌

  • @shiro._.official4676
    @shiro._.official4676 Год назад

    thank you, this video is exacly what i am looking for

  • @spammingtrigger536
    @spammingtrigger536 Год назад

    Great tutorial, learned a lot

  • @jaimelucy2010
    @jaimelucy2010 5 лет назад

    THANKS FOR ALL YOUR HELP.

  • @ThisWorks4Me
    @ThisWorks4Me 5 месяцев назад

    Great video. By the way, the major factor in the strength is the O.D. of a tube/gear, not the infil.

  • @Amish_Mafia
    @Amish_Mafia 2 года назад

    I'm at the step making the spokes in the big spur. I mirrored the line, did the circle pattern and when I hit E to extrude the sections between the spokes, it selects that spoke as well. It's like the lines I made for spokes arent actually seperating into sections. When I extrude it takes out the spokes haha, what am I doing wrong maybe?

  • @AiswaryaM739
    @AiswaryaM739 4 года назад +1

    Great tutorial!

  • @45llamas
    @45llamas 4 года назад

    19:50 im trying to cut as well but the ok buton doesn become blue ( it does not let my cut for some reason)

  • @TheShovon123
    @TheShovon123 4 года назад

    Thank you so much for the amazing videos. You really helped me to get a good grasp on 3D modelling which I though is sth that I can never get a hold of.

  • @danielev2762
    @danielev2762 3 года назад

    Perfect, that's all I needed, thanks !

  • @gael6364
    @gael6364 10 месяцев назад

    thank you for getting me through my degree!

  • @Pauleigh55
    @Pauleigh55 3 года назад

    Fantastic, thank you so much for clear and immensely helpful tutorial.

  • @ArtVandelayInc
    @ArtVandelayInc 4 года назад

    man your videos are so good

  • @tomjoad1060
    @tomjoad1060 Месяц назад

    Thank you for the video. An idea for gears: one gear, mounted on top of a servo, controls another gear, for example controlled to a rudder of a boat.

  • @BillyBob-si2db
    @BillyBob-si2db 5 лет назад +1

    Awesome tutorial.... This is great, more add ins examples would be great!

    • @ProductDesignOnline
      @ProductDesignOnline  5 лет назад

      Thanks! I will definitely try to cover some of the other add-ins that I think are worth it. Not all of them are 3D printing related, but can be useful for other projects. Cheers, Kevin :)

  • @Lucas-wf5sc
    @Lucas-wf5sc 4 года назад +2

    I need you to make a thread tutorial with Cura as your slicer. My thread don’t fit on each other!

  • @markhaley4952
    @markhaley4952 5 лет назад

    Great tutorial Kevin have been trying to sketch gears for a while and not really getting anywhere it would be great if you could do one on bearings keep up the brilliant work.

    • @ProductDesignOnline
      @ProductDesignOnline  5 лет назад

      Thanks, Mark. I'll add bearings to the list of topics to cover for this series. Cheers, Kevin :)

  • @Hellzing50
    @Hellzing50 4 года назад

    Would be nice to have a tutorial on creating gears and escapement mechanisms for a mechanical clock. Fingers crossed!

  • @nathanmarotz8945
    @nathanmarotz8945 Год назад

    i have no clue what i'm doing wrong but faces aren't being made after i make the lines, mirror and turn them into a pattern. it will recognize some of the lines, but i can't select the gaps i want to extrude. followed through several times and made sure they are the right lines, tried both sides, and tried multiple sketches.

  • @breakfixmake3405
    @breakfixmake3405 4 года назад +1

    Hiya, thanks for your videos.. Very easy to follow along. If I could, I'd like to request a tutorial on how you'd do a Rack and pinion for lifting or moving.

    • @ProductDesignOnline
      @ProductDesignOnline  4 года назад

      Thanks for the suggestion, I've added that to my video topics list. You can also checkout "insert McMaster-Carr Components" and you could reuse one of their prebuilt ones :)

  • @LL-vt3is
    @LL-vt3is 4 года назад

    Hello Kevin, I thoroughly followed you through 16:49 but can't get the object to extrude right as seen on this link: img .ur/a/6YexsD9
    Can you please point out where did I went wrong? Thank you

    • @ProductDesignOnline
      @ProductDesignOnline  4 года назад

      Hi LL. I'm seeing you have at least one closed profile... but based on the images I cannot tell if all four of the 'sections' are fully closed. That is the first thing to check. Second, you can select the four sections (while holding down the shift key) and then activate the Extrude command. Sometimes it's easier to select things first.

    • @buder5116
      @buder5116 4 года назад

      wondering if you got it fixed but try to use coincident in constraints tab red+black line on a corner
      i was wondering the same since i used a point to point to make a nice curve :D and i am a 3 day begineer :D

  • @Flaffi78
    @Flaffi78 2 года назад

    if I want to design a gearbox, do I need to make sure the "module" setting is same for all gears?

  • @Schwuuuuup
    @Schwuuuuup 2 года назад

    The rotation of the smaller gear can very easily calculated without try and error: You want to rotate it by half a tooth, so 360°/16 teeth / 2 = 11,25°

  • @SourceMinion
    @SourceMinion 5 лет назад

    Thanks for the video Kevin, it was really helpful.

  • @pedroazuajebolivar603
    @pedroazuajebolivar603 4 года назад

    awesome explanation! i can do it myself without any problem and understand what im doing in the program

  • @HarryLeBerry
    @HarryLeBerry 8 месяцев назад

    Doubt this will be seen, but is ther any way to change the center hole to be a small square?

  • @frankdearr2772
    @frankdearr2772 Год назад

    Great topic, thanks 👍

  • @baraBober
    @baraBober 3 года назад

    Thanks, very useful video!

  • @patrickmaartense7772
    @patrickmaartense7772 5 лет назад +1

    very well explained, thank you for your good content

  • @Microdose_RC
    @Microdose_RC 4 года назад

    How would one go about figuring gear sizes for a pre determined distance? I'm working with 26.378mm distance, wanting a 2to1 ratio .8/32p gear set but keep failing.

  • @catxd2778
    @catxd2778 2 года назад

    i have a cuestion how did you print the gears with suports or did u set everithing apart?

  • @PRASANTHJMATHEW-vi6lg
    @PRASANTHJMATHEW-vi6lg 4 месяца назад

    Shouldn't the root fillet radius be same if the module is same for both gears?

  • @ianm1898
    @ianm1898 4 года назад

    hi I saw a wooden gear toy on youtube, their teeth are pretty straight and sharp at the end. do they make it by sketch not using this kind of feature? thanks

  • @MohamedMostafa-tv6cd
    @MohamedMostafa-tv6cd 5 лет назад

    Great video , i needed it to explain the tricks of gears creation ... thanks Kiven

  • @sinergicus
    @sinergicus 3 года назад

    Can you design ,with this script gear pulleys to work with gear belts ?

  • @randombutcoolvideos4433
    @randombutcoolvideos4433 4 года назад

    i am so confused on how you did the circles at 9:51 someone please explain

  • @GMDII
    @GMDII Год назад

    Thanks so much for this. This helped out a lot !!

  • @jcktrck
    @jcktrck 4 года назад

    Great work, keep it up. You teach me so much.

  • @larryragan8158
    @larryragan8158 4 года назад

    Thanks for this video. I would like to see a double herringbone gear set.

  • @rogertomlinson569
    @rogertomlinson569 5 лет назад +2

    Great video Kevin really useful. BTW, regarding the rotation of the small gear to bring the teeth in line: Would it be calculatable by the simple formula
    (360/ 2 x NoOfTeeth) = (360/64) = 11.25 ?

    • @ProductDesignOnline
      @ProductDesignOnline  5 лет назад

      Hi, Roger. That should be it. Depending on the number of teeth and how the gear generator places it... sometimes the gears will not need to be rotated. The second gear will just need moved to the right. Cheers, Kevin :)

  • @PawelAjs
    @PawelAjs 4 года назад

    Thank you. Very good explanation. I'm printing my own gears :)

  • @darrylportelli
    @darrylportelli 4 года назад

    what if I have a gear that I am trying to replicate ? .... it is very difficult to measure accurately the pitch diameter , but it is very easy to measure the outside diameter .... how do I calculate the module and the pitch diameter of the physical gear that I have , if I can only measure its teeth count and outside diameter ? thanks