Modeling an Equation Driven Involute Spur Gear in Solidworks
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- Опубликовано: 22 фев 2014
- The method given in this video works when diameter of base circle is bigger than that of the dedendum circle.
When the number of teeth is increased to big enough, the base circle diameter will become smaller than than the diameter of dedendum circle. Then the gear profile will be all involute. One can use similar approach given in this video for such case.
The tutorial file for this video can be downloaded from
drive.google.com/file/d/0B5me...
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 an amazing tutorial, thank you very much for taking the time to make it and sharing it with the world!
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!
Thanks for putting together this video, really appreciate it. Comprehensive and easy to understand.
I really love it, job well done!!! You have won a new subscriber :)
I wish, I had lectures like these 10 years ago in university. Great tutorial! Thank You!
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.
Thanks Yang, the tutorial is detailed and easy to follow. Save me tons of time!.
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!
Very good work. I have now a complete parametric gear !
Thank you very much !
Thank you for the post! Helped me immensely!
Unreal tutorial! Thank you so much!
This is best video about gears in SW! Pro. Thank you!
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).
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.
Can you explain why you made the diametrical pitch dependent on the pitch diameter? What does this solve?
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.
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.
Great tutorial. This video captures the difference between hobbyist level CAD and actual mechanical engineering XD
Thank you so much for this sir !! this is Absolutely well done and very helpfull !!
Awesome tutorial. Thanks!
THANKS a bunch from australia :)
Very helpful video. Thank you very much!
Nice info,thanks for sharing it with us, well done :)
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! =)
Excellent video
Thank you my Teacher
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
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.
You are a gentleman and a scholar. Thank you so much for this comment.
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.
Thank you sir. True legend lol
thanks alot for this
Thank you so much!! I needed to crank up a bit but it was totally worth it!
Im so happy I can make gears now!!!!
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.
Fantastic tutorial
Great job sir!
It basically saved my life thanks sir
Thanks a lot Mr. Yang Cao.
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!
Great video sir!
this is the best. It helps. Thanks
Thank you soooo much.....it was very helpful....😃
Excellent video
Hi there, on your notepad, the alpha equation is different than shown on the PDF. It is wrong?
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
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.
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.
thanks for the tutorial, very good! Can you give me a solution for a number of teeths >420 and metric module 4?
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?
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?
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
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
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?
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.
great tutorial! learned a lot from this video. Thank you! :D
Great tutorial, but wouldn't be easier to make the second involute curve as a symmetry from the first one (via the constrution line)?
Very good! Two question. The parametric part remains blue is it still undefined then?
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.
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
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
thanks mr cao...
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.
Have you tried to build a non circular gear with involute teeth? Something like gearify but with involute teeth. Would be great!
Great Work Many thanks
Do you have vedio on helical gear tooth cut ..like you showed on spur gear
Thank you so much man
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.
I am unable to add new global variables, only one is being entered ... what to do ?
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?
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?
thank you so much sir!!!!!!
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?
Would it not be a simpler method to mirror the first involute profile over the center line?
Would it be possible to mirror the second involute istead of using another parametric curve?
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?
Can u make the same tutorial for Bevel Gears? Thanks.
emm really, you used radius when you did outline tooth ? Where you have necessary calcutations about this ?
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
Circular pattern when linked revert back to same value any idea
Why pattern 20 when he got 18 teeth? it happened to me when i designed my gear (different characteristics)
How can I alter this to make less than 13 teeth possible?
GREAT VID
Thank you so much sir!! I m really greatful!!
Do you have similar explaination for Internal Spur Gear Modeling?
How would I modify the equations to suit a gear with a large number of teeth?
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.
my gear theeth does not match properly. how do i correct it?
if i have to increse anlge alpha how do i do that?
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
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
how can you control face width in your method? does face width affect other parameters in gear design?
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?
That is just a value for "t" I randomly selected after a few trial.
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)
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.
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
how did we get that 0.68 value for t2, quite confused
Could you provide the information on how to obtain alpha? Thanks
thankyou so much
Can we have access to the tutorial you used as base.
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?
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
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 ?
where does the 0.68 come from in the involute curve parametric equation
Can you tell me how to draw helical gear by using equation
For number inside of the circular pattern could you not just call the variable "number or teeth"?
How do you create a curve with profile shift?
How can I incorporate profile shift as well?
This method looks pretty strong
THANK U !!
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?
When defining the parametric curves, what are the values inputted into t1 and t2? 0-0.68. What are these representing?
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.