Thank you so much for this great tutorial. I'm really glad to learn the equation driven function for drawing the involute, instead of drawing numerous tangent lines and confusing myself. You've helped me out so much!

Wow, wish I had Dr. Cao as my professor. What an excellent demonstration and accompanying material. Thank you for making this accessible to everyone!

This is fantastic! I was able to follow along using OpenSCAD instead of Solidworks because of how detailed your explaination was. It also cleared up a bunch of questions I had regarding gears in general. Thanks for sharing!

This is an amazing tutorial, thank you very much for taking the time to make it and sharing it with the world!

I wish, I had lectures like these 10 years ago in university. Great tutorial! Thank You!

Thanks for putting together this video, really appreciate it. Comprehensive and easy to understand.

Hello, thanks very much, you saved my life :D Just a suggestion, to automatic define the root fillet, i used 0.8*c, so we got 80% of clearance (a safe value).

Your video has certainly helped my team design our own gears for a design project. Your video is very clear and concise. Thank you Sir.

Well, that's about as good a demo as can be done. Nice job, sir. And thanks for a solid technique.

Thank you so much! I am helping a client design a machine utilizing a few existing parts and needed to create gears with a dimetral pitch of 4.62. I couldn't make it work, but with this, it was a breeze!

Hello, I very much enjoyed your presentation and demo, excellent, you kindly explained all the steps and it was relatively easy to follow, much appreciated. Thanks.

Thank you so much for this. Absolutely spectacular. I'm using this to make a clock, and I found that by simply inputting "N" for the number of instances in the circular pattern you can have it auto update. Also, I made the diametral pitch dependent on the pitch diameter via adding another variable. Just a couple things to make changing gear sizes easier.

@mattamiller

9 жыл бұрын

Can you explain why you made the diametrical pitch dependent on the pitch diameter? What does this solve?

@mattcrossman6518

9 жыл бұрын

Matthew Miller I'm using SDW 2014, not sure if it will work on older versions. I simply put "N" (without quotes) into the field "Number of Instances" when I did the circular pattern. This way I can make a bunch of different size gears without having to update the number of teeth in the equations AND the circular pattern. As for the pitch diameter, I just made another variable (named pitchdia I think) and changed the value for "P" to an equation based on "pitchdia." This really doesn't solve anything for most practical uses, but when you're making a bunch of different sized gears, it shaves a minute or two off each one.

Thanks Yang, the tutorial is detailed and easy to follow. Save me tons of time!.

I really love it, job well done!!! You have won a new subscriber :)

I just wanna thank you for this, this is an incredibly helpful tutorial and your other videos are very helpful as well. You're a fantastic professor. I wish SolidWorks had a gearing tool though. Also, it would be helpful if you could speak up a little bit in your videos.

Very good work. I have now a complete parametric gear ! Thank you very much !

Unreal tutorial! Thank you so much!

Thank you for the post! Helped me immensely!

Great tutorial. This video captures the difference between hobbyist level CAD and actual mechanical engineering XD

This is best video about gears in SW! Pro. Thank you!

Super helpful video. Some advice would be set the number of instances of your circular pattern to "n" and the fillet to a fraction of "c" (for example he used R.10 with a .125 clearance, so you could set your fillet to 4/5*"c") to ensure it will never be larger.

Hi there, on your notepad, the alpha equation is different than shown on the PDF. It is wrong?

@cephalopogg

3 жыл бұрын

If you're referring to the *180/pi, this is the conversion from radians to degrees. This is here because the equation calls for radians, (notice "phi rad"), however our pressure angle is in degrees

Great tutorial, sir! Just one note: when creating the circular pattern, one might need to be sure to have the "Geometry pattern" checkbox checked in the circular pattern dialog box, otherwise it might not let one propagate the fillet as well

@PaoloCostaBaldi

5 жыл бұрын

Damn it. I just lost an hour erasing and redoing everything step by step. I was going crazy until I figured it out on my own.... I was going nuts! Now that I'm reading your comment I feel trolled xD BTW great tutorial Yang Cao, but you should have used an equation in the circular pattern, that's pretty obvious. So you don't have to manually adjust it every time. Number of patterns must be equal to "N". Same thing for the fillets, you could have used an equation like "fillet radius equals 0.5*clearance" or sth like that.

@jtcook63

5 жыл бұрын

You are a gentleman and a scholar. Thank you so much for this comment.

@andrewhudson6199

4 жыл бұрын

I had an issue with that, but I changed my fillet so that it was included in the sketch, and then set it to an equation.

@karmdeepsingh6208

4 жыл бұрын

Thank you sir. True legend lol

@aakashjogalekar2661

4 жыл бұрын

thanks alot for this

Awesome tutorial! I think you can also drive the fillet and circular pattern using equations. That would make it a little more time saving. Thanks again for this tutorial! =)

thanks for the tutorial, very good! Can you give me a solution for a number of teeths >420 and metric module 4?

THANKS a bunch from australia :)

Awesome tutorial. Thanks!

Hi and thanks for sharing this great tutorial! It has been very helpful. Can I ask, is this gear design based on a "zero backlash" basis? And if so, how would you recommend building in backlash? Is there way to do it using global variables such as modifying the pitch circle diameter or module etc? Many thanks again!

Thank you so much for this sir !! this is Absolutely well done and very helpfull !!

Very helpful video. Thank you very much!

great job displaying the exact equations necessary to produce a gear that can be changed with only a couple variables. Could you produce a video teaching us how to build equation driven helical bevel / miter gears?

Nice info,thanks for sharing it with us, well done :)

Thank you for this video. Is there a way where I can dictate the addendum circle diameter? I am trying to remake a gear I currently have that has a addendum circle diameter of .94454 with a diametral pitch of 24, 42 teeth, and pressure angle of 20deg. Thank you

Excellent video Thank you my Teacher

Great video. Used this information to make a template using a design table for not only spur but helical gears as well. The only thing I am unsure of is what determines what the clearance, or fillet radius, is. Does anyone have any knowledge of this?

Great tutorial, but wouldn't be easier to make the second involute curve as a symmetry from the first one (via the constrution line)?

Thanks a lot Mr. Yang Cao.

Thank you so much!! I needed to crank up a bit but it was totally worth it!

@iggypeters5564

Жыл бұрын

Im so happy I can make gears now!!!!

Very usefull material. Thanks a lot. When you say "a" need to hear "b" as well. Don't you have a tutorial for internal involute gear too? Hot to direct involute curve toward center now?

Hi Dr Yang Cao, Thanks for the video! it help a lot, but I noticed the link for the tutorial file isn't working any more, I wonder where I can download it again, it's very good information.

Hello! Excellent tutorial! I am running into one issue though with the Phi value. I can change N and P to all the combinations I need without issue, but when I change Phi to 30 degrees I get a Dedendum circle that is larger than the base circle and the pattern won't cut. Any advice on how to fix this? I am trying to draw a 5/10 36T 30deg involute gear.

In SW 2013 if you double click the pattern and edit the dimension in the view window, you can enter the global variable there. This also works for helix.

Hello Mr. Cao. I am trying to create my initial equations just like you do on the video. However, I am not able to do so. After I enter the Global Variable name I press enter and continue to the Value/Equation area. Once there, I enter the value I want and press enter, but it does not accept the value. I cannot continue beyond that point. Hope you can make a suggestion to my problem. Thank you in advance.

Thank you for sharing! Note: to write equation you may need to write with " " the variables. Improvements: - Number of tooth can be linked to the circular pattern instances - Fillet radius can be setted as Diameral Pitch / 10, this prevent manual adjust - Alpha calculation is not required, simply link the line to the intersection with Diametral pitch, than simpler equation as 360/4/N. - Not necessary to write two equation, can be used one than mirror it

@ramkrishnan2844

4 жыл бұрын

Circular pattern when linked revert back to same value any idea

@user-fn9bt5yr7c

4 жыл бұрын

Why pattern 20 when he got 18 teeth? it happened to me when i designed my gear (different characteristics)

This video worked out great for my except for one thing. When I finished my gear even though I had an N of 21 I ended up having 24 gear teeth. I noticed that on yours too you ended up having 20 gear teeth when you finished your circular pattern. Is there anyway to fix that?

It basically saved my life thanks sir

Thanks for uploading this, it really helped me understand the process a lot more. I have made my version of your model, are there any conditions that need to be modified to account for a much larger spur gear? I am trying to model the angle but my value comes back as a negative value and cannot define the angle. Diametral Pitch = 0.3333 No of teeth = 110 Pressure angle = 20° Addendum Diameter = 336mm Pitch Diameter = 330mm Base Circle = 322mm Dedendum Diameter = 322.8mm My tan and beta angle values in the involute curve come back with a value of -0.3° Has anyone used this to create a relatively large spur gear?

Fantastic tutorial

屏幕录像专家。。。记得当时看黑客视频就是用这个软件。 现在在油管上看到了，满满的回忆啊

I really appreciate your effort. I am just beginner of solidworks and followed your lecture and got it. As you mentioned I encountered the base circle diameter is smaller than dedendum circle diameter. Do you have other lecture for this or should I draw from the beginning? Please let me have your tip for this. Thanks in advance

Great Work Many thanks Do you have vedio on helical gear tooth cut ..like you showed on spur gear

Great job sir!

I am unable to add new global variables, only one is being entered ... what to do ?

Does anyone know how to do this with SW2007? I can work out the equation feature differences, but this version does not have the Equation Driven Curve feature. Any ideas?

Excellent video - very helpful. One question though. At 9:45 you enter 0.68 into the T2 field. What does this value represent, and how is it derived?

@YangCaoUBC

9 жыл бұрын

That is just a value for "t" I randomly selected after a few trial.

@project-moe

7 жыл бұрын

he chose 0.68 so he can put bounds on the curve of that first involute line, otherwise it would keep plotting for all infinite points of t (reference for anyone else wondering)

@domkelly1972

6 жыл бұрын

this determines the length of the curve from the start . it is the end point of the curve. it just needs to be long enough to go past the outer edge of the gear body so you can trim it later. type 2.00 in that field and you will see what happens.

Can u make the same tutorial for Bevel Gears? Thanks.

Have you tried to build a non circular gear with involute teeth? Something like gearify but with involute teeth. Would be great!

Thank you soooo much.....it was very helpful....😃

How can I alter this to make less than 13 teeth possible?

Dr. Cao, thanks for posting this! Now to find out why Solidworks fails at 39 teeth (when the dedendum circle diameter is greater than the base circle diameter).

@tobyteddy222

8 жыл бұрын

+Jeff Biss Have you, by any chance, figured out yet why it fails at 39 teeth? I'm experiencing the same problem.

@jeffbisscrx

8 жыл бұрын

+tobyteddy222, nope, I have not figured out why. I have contacted my reseller and they said that they are looking into it, I sent them my part file. I think that it has something to do with base circle being a smaller diameter than the dedendum circle. If you look at the results of 39 teeth, you'll see that the tooth base produces "notches" with the involutes. Trimming the dedendum circle and each involute turns one of the involutes red and the "The sketch has not been undated..." message is displayed. I will post any resolution when I get it.

@jeffbisscrx

8 жыл бұрын

+tobyteddy222, I still haven't received a reason why this fails but have developed a work around: 1. Open an new sketch on the same plane as that which holds the equation driven involutes. 2. Select the involutes and the base (dedendum) circle. 3. Click Convert Entities. Those features are now copied onto the new sketch with no equation driven relations between them. They can now be trimmed as required so that you can use the new sketch to Extrude Cut the disc. After you extrude cut, simply create a Circular Pattern using that Cut-Extrude feature and you're done! You can now create spur gears of any number of teeth up to 105. There is a problem with this method because 360/(4*N)-alpha equals zero when N = 105.3916. So, gears with 106 and more teeth will fail.

Thank you so much sir!! I m really greatful!! Do you have similar explaination for Internal Spur Gear Modeling?

Great video sir!

this is the best. It helps. Thanks

Is there any way to have the equation driven curve not show as under defined? I find that I can drag it with the mouse, and that makes me nervous.

Would it not be a simpler method to mirror the first involute profile over the center line?

How can I adjust the equations to make gear with different diameters? If I adjust the "P", the size of the teeth changes also such that the new gear cannot fit into the original gear. How can I change the equation so that I can make different size gears that can still work with the original gear?

Thanks for the great tutorial. I`m just confuse why do you need to create the second involute? when i tried to mirror the first involute using a quarter of angular circular pitch, the result was the same.

@jeffbisscrx

8 жыл бұрын

+francis wayne mojana, it doesn't work properly if you simply mirror. It does work for the very first gear you create, but when you change the number-of-teeth variable and rebuild, you'll notice that the tooth profile is wrong. You need both sets of parametric equations for this to work as a template for creating other gears.

it seems that whenever we change values the form of a tooth change. what should i do if i want to make two gears with different diameter circle and the same form of a tooth ? because i want to make a smal gear that can move an other big gear with a 160mm addendum circle diameter but i dont know how to do that because the small one hasn't the same tooth as the big one. can anybody help me please ?

Hi Dr Yang Cao, i did succesfully created a pinion with N= 36 Teeth , Moudle= 1.25, with P=0.8 . However when creating the Gear of N=108 Teeth (3:1) ratio, i had a problem with beta angle as it turn to be negative and this cannot be accepted in solidworks , so resulted in a different involute profile for the gear ?. How to solve this problem? and what angle beta should be used for the gear. i would really appreciate your help. Cheers

Very good! Two question. The parametric part remains blue is it still undefined then?

Could you provide the information on how to obtain alpha? Thanks

Excellent video

What should I do, when it is saying Unable to create instance for the pattern. Try again by decreasing the number of instance or the distance between instances

Is it possible not to use alpha? Let's say the straight line attached to involute curve is line "A". What if I draw a line "B" from center to where involute curve meets pitch circle where D=9. Then draw another line "C" from center at 360/4N degrees from line "B". Then mirror involute curve and the straight line "A" attached to it accross line "C". I tried this which should make sense, but then angle between line "B" and "C" is 4.2 degrees instead 4.15 shown in your video. Which part did I do wrong?

Would it be possible to mirror the second involute istead of using another parametric curve?

How would I modify the equations to suit a gear with a large number of teeth?

hello, nice video,first i modeling 2 gear but i have a probleme for collision when i want to assemblate them, why ? the second, i want to simulate stress gear, how can i do it ? thank you very much

Great video! Helped me a lot. Just one comment. When you named your global variables, you called "P" Diametral pitch but I think that should be the pitch diameter (in) and you called "dp" pitch diameter when that should be diametral pitch(teeth/in). The values are correct though. Thank you so much for your help.

my gear theeth does not match properly. how do i correct it? if i have to increse anlge alpha how do i do that?

good morning, i have a problem. when i put the value of the number of teeth equal to a high number, like in my case 94, it creates between two teeth a strange thing, how can i do to remove it? thaks for your attention

Can you tell me how to draw helical gear by using equation

emm really, you used radius when you did outline tooth ? Where you have necessary calcutations about this ?

Hi, I would really like to know what needs to be changed if the base circle diameter is smaller than the diameter of the dedendum circle? None of the videos on youtube has a solution for my question.

Dr Yang, really helpful video. Question from my side (couple of years after your video and the majority of the responses) But, can you please describe / explain why are you using "t2=0.68" which such value? I've reviewed your material, and I don't see, yet, the correlation Could you please help me to understand? Thanks

@MunchFaceBro

6 ай бұрын

I played with it. I could be totally wrong but I think t2=.68 just guarantees the involute curve will extend past the addendum circle diameter. Like if you made both t2s=.75, the gear would still be exactly the same.

Very nice tutorial Mr Cao, I have a question, do you know, how to design a rack and pinion (obviously I learned how to do a pinion), but I cannot to draw a rack to matching pinion with, I will be very happy, If you could do that. Thank you very much.

great tutorial! learned a lot from this video. Thank you! :D

thnk u for the video, my problem is with m=2.5 angle pressure 20 ans nbr of teeth 45 the base diametre is higher than the dedundum cercle diameter how can i solve this please

When defining the parametric curves, what are the values inputted into t1 and t2? 0-0.68. What are these representing?

@LegacyAirTech

3 жыл бұрын

the start and end bounds for the t parameter. 0 means start at the beginning (t = 0) and the 0.68 number is arbitrary, it just needs to be high enough to make the curve extend beyond the addendum diameter so that you can use it to cut the gear profile later. You can "guess and check" the 0.68 value until it extends past the biggest circle.

For number inside of the circular pattern could you not just call the variable "number or teeth"?

how can you control face width in your method? does face width affect other parameters in gear design?

This method looks pretty strong

Thanks a lot for this awesome tutorial. Till now, it is the best one with scientific basis. The voice is clear, the accent is very good, and referring to lecture is very nice. Can you please tell me why the "base circle diameter=Pitch circle diameter*cos(Phi)"?

@watchingdemon3942

6 жыл бұрын

khkgears.net/new/images/basic_gear_terminology_and_calculation/Fig.-2.6-Working-Gear-Nomenclature.jpg This is the link to a picture, on which you'll see that it's a simple right-angled triangle

I followed your instructions.. just putting in my own numbers for the variables at the beginning... and my first equation curve is completely wrong. im not sure why. sw 2016

thanks mr cao...

where does the 0.68 come from in the involute curve parametric equation

Ive followed this video with gear data of my own and its not working, Im starting to believe the information ive been given by one of our manufacturers is incorrect. Could someone confirm if this data works? Teeth: 8 Pitch: 10/12 DP combo Stub Pressure angle: 20° Outside dia: 1.056" Root diameter: 0.678" Whole depth: 0.189" Pin diameter: 0.173 MOP: 1.084/1.080"

Is there some reason why can't you just mirror the first involute curve across your centerline instead of modeling a separate equation driven curve?

Does anyone know how to make a rack gear using driven equations

I am running into a problem with the equations where my gears are large and my base circle ends up being smaller than my dedendum circle example 50 gears. Is this something that I am doing wrong? Maybe i copied and equation wrong or a problem with the format. Let me know plz

Is there any advice for how to enter the equations, mine keep showing up red

@AD-tf6vh

7 жыл бұрын

John, could be you have a different language version in SW? I.e. in german "Sketch" is called "Skizze", therefore straight copy/paste wouldn't work for involute equations. Or you may have to use quotation marks as sb mentioned below.