I have watched many videos on gear design and this video is by far the best explanation of how gears are designed and the use of equation tables to control size and number of teeth for a gear. The narrator speaks clearly, knows his subject and moves slow enough for viewers to follow the video. In my opinion the best tutorial on the subject I have ever viewed. Great teacher!
This is a great SolidWorks tutorial, with the one exception that these gears would explode in use. Gear teeth are nearly universally involutes, not circular arcs. SolidWorks even offers involute support. This can't be overlooked.
After the first impulse to agree, I googled it (but didn't get too deep into the matter) and found that actually the "Wildhaber-Novikov gearing" or "Circular arc gearing" seems to even have advantages over the common involute or zykloid teeth... But it is more complicated to manufacture - and so quite rare. Anyway I guess that if someone is constructing "gears", he is going to buy them as standard parts. Or if he really makes them himself - he knows about involutes ;)
nice tutorial for using the equation functionalities however as a mechanical engineer here are some major faults in the design: 1- by definition the involute is never an arc, it follows sin and cos formula 2- the pressure angle should never be done as shown, it simply used to calculate the base diameter where the involute starts 3- the helical angle is also wrong, simply projecting a line is so wrong, it should be done with a "helix", the helix pitch depends on the helical angle and pitch diameter, for instance for 45 degrees its tangent is 1 so the pitch is 3.141 * pitch diameter I didn't want to sound critical, but if you produce such tooth profile as indicated the gears will slide and won't roll. they won't be efficient at all especially for molding plastic gears. I have produced perfect gears geometries this way, it takes more time in the beginning but if you set your global variable as indicated it should be easy. I will be happy to share my knowledge with the community thanks
jean daher I had the same thoughts, jean. The method in this clip is wonderfully simple, and great for making realistic looking gears (as long as the "looking" is done from a distance) but it should be made very clear that gears modelled in this way are not functional. Most people will not realise that the projected curve, in particular, produces a different result from a helix, and it is increasingly incorrect as the helix angle increases. A "crossed" skew-gear pair at 45 degree helix angle would make this very apparent, and the interference towards the ends of the teeth would be considerable. A further problem is that, for a helical gear, the tooth profile needs to be swung around normal to the helix. Not that it matters for a "Not for production" visualisation of a gear.
+jean daher I am studying Design of Machine Elements, and one of my final assignment is to create a gearbox, which I have choose to use spur gear and I found your comments very accurate with what I am studying at the moment.Would you share how you have created perfect gear geometries? I am struggling at the moment in creating the shaft....
Sure, but as I said it takes some time upfront. SW is also limited since it always refers to the original coordinate system and disregard the new one. (I complained abut it, they admitted it but still not fixed) 1. start setting an equation for 1a-pitch diameter 1b- diametral pitch (module for metric) 1-c pressure angle 2. make a sketch for all relevant diameters driven by the equation, from previous you can set your number of teeth, base diameter, addendum etc. 3. now create an equation driven sketch, make sure you pick parametric with t1=0 t2=2*pi (it doesn't have to be 2pi but it is better to be longer than not enough) set Xt=(base diameter/2)*cos(t)+(base diameter/2)*t*sin(t) set Yt=(base diameter/2)*sin(t)-(base diameter/2)*t*cos(t) you should have a full involute. after that just fix the curve, another bug with the software the rest is up to you to make an extrusion based on that sketch and cut based on equation curve, create the cuts pattern from calculated number of teeth. if you follow that you have a template that works perfect every time. once you master that helical gear is similar however you cut the involute with a helical cut instead straight cut. the helix pitch will based on helical angle described in earlier post hope that helps you jean
off chance that you will see this but i need some help with a gear design and wondering if you would be willing to freelance? 15t and 21t 3.25" on center
I've only ever played with Google Sketchup and auto CAD from like ten years ago but I fully understood the entire vid. you're a pro and I appreciate your thorough approach and solid focus. I hope to be able to get into solid works and learn more from your vids
Through out years of looking for a proper gears video, this is hands down the best of the best. Well explained and simple to replicate in any CAD software. Thank you!
Thank you very much for this detailed tutorial. Even after 5 years, this is still a great tutorial to follow on when learning how to design gears in Solidworks!
Very nice tutorial, thank you very much. Just one small thing. At 6:39 you say the whole depth should be 2.40*m if module is finer than 1.25, and 2.25*m for coarser module. But should this not be opposite? I would expect a greater whole depth for a coarse module gear.
Wow, this video was great. Well spoke, directions and descriptions were clear also. Two thumbs up for me. Keep the videos coming. I like to follow along in solidworks and create parts to help me practice.
This is awesome. With equations you can even add conditions for the rest of the wheel, like making it solid or hollowed, the size and number of pins. Thank you.
I only recently received a certificate as a SolidWorks Associate. This video was very helpful! Now making drawings for these two gear types won't be so troublesome.
Dont forget that you can drop your driving sketch into every assembly and sub assembly, this lightens up the processing time in the main assembly and helps your computer to think in smaller chunks of information this helps stop crashes and opening and saving times.
Very helpful thanks. I needed to sketch a gear at work today and although it was something I routinely did in minutes ten years ago it had completely slipped my mind! Thanks for the tips!
it was really help for my project. Thanks Mr. Jeremy. Is is possible, if you could manage to produce a tutorial on worm gear? It will really help alot.
Thank you very much for the lesson! It's nice to see some of the shortcuts that I've learned along the way can be done in a simpler more efficient way! Never used "derived sketch" before. Now I'll fully abuse thatcommand! :-)Can we see a tutorial on creating a continual "internal cam surface" that I can use in a motion study?
just an FYI, the gear as modeled produced interference when mated with an identical gear of ~0.2mm according to interference detection features. It would not be functional. I verified the equation outputs to be sure it was not a replication error.
Great job showing us the tooth profile generation & a gear that can have the helical twist adjusted within a sketch or simply making reference to a global variable as tooth angle/twist. Could you produce a video teaching us how to build equation driven helical bevel / miter gears?
How do I modify the sketch for outer diameter (5:46 in the vid) to make this an internal gear? Or is that the wrong way to do it? I've tried multiplying the module by -1 but that doesn't work.
ooh, change the equation to -2 of the # of teeth instead of +2. I love when you spend forever on an issue then figure it out as soon as you ask the question.
This helical thing is all good, but ... if the derived profiles are not perpendicular to the projected curve, the tooth profile is being "squeezed" together as the helix angel increases, thereby compromising the profile and thinning the tooth along its width. - A better way would be to create the projected helix curve (as shown), creating a reference plane along (at the end) - and - perpendicular to the curve, and on here sketch the tooth profile and perform a sweep to preserve the integrity of the profile along the helix curve, no matter the applied helix angle!
I really like the way this was taught, I see a worm gear in the animation. is there a tutorial, you have posted, that shows how to make "worm" and "rack and pinion" gears
so looking through the comments a lot of people are saying this isn't mechanically correct. Would this spur gears design method be sufficient for prototyping out of acrylic or plywood with a laser cutter, or will they fail instantly? A lot of people have said things along the lines of 'this is wrong, this is what you should have done' but what I want to know is why it should be done differently. Is it simply more efficient, or is it an absolute requirement that these parts be produced differently? Thanks in advance for any replies.
Hei, two questions: *Will the teeth profile really be correct by using an arc? *Couldn't see of the trajectory used for making the helical gear cut out really became a helical curve or just a straigh line in space, so, was it a helical gear that you produced or just a "lool-alike"? Thanks, Pontus
I am wondering if for the outer diameter the equation should be = ("Number of teeth" + "Module") * 2 instead? Doesn't make that more sense or am I missing something? The way you presented it, you always have to go back and change the equation.
Thank you for this great effort I have a question please answer me I used all the methods to draw the model and all the methods that I used I think are unrealistic. Generally The first question is do you think this method is the best for drawing gears??? If the answer is yes, then why does the width of the tooth appear to be wider than the reality if the number of teeth is less than 10??? The last question is, is there a law regarding the depth of the tooth? If the model is greater than 1.25, the formula is used [the model * 2.25] and the smaller one is [the model * 2.4], or is it worth experimenting??? Thank you
Hi, I have a question for you. Can you please explain how did you set the angle of the arc for helical gear to 10 degrees? did you calculate it? or did you just randomly set that to 10 degrees? Many thanks
+Pedro Aguilar Could you post this to the MySolidWorks forum? It's a better place to get tech help on specific issues like this. my.solidworks.com/forums
I have the following points for clarification: 1.How to create gears with actual involute profile? 2. @10.15 the profile curves were dragged to meet the root diameter. However, for gears with less than 43 teeth, base circle would be bigger than the root diameter. In that case what do we do? 3. Profile used for creating the spur gear can not be used for Helical gear. The profile used for Loft cut should correspond to the profile in transverse plane and not the normal plane. I sincerely request you to make a detailed demo incorporating all the above mentioned points.
my system won't allow me to add the details in the equation manager, when I do the "Module" it will only allow me to ad a 2 without the mm notation, if I add the mm it fails to allow me to do anymore, if I leave the mm off, I can just add a 2, is there an add-on I am missing ? or something else in setup you had already done. I did make a Metric tab for my parts template, seeing yours was modified.
Worked out all my issues except now I cannot add the equation for the two filets at the bottom of the cut, I am getting Filletxpert, instead of the basic fillet, I turned off Featurexpert, but still only allows basic numbers no equations, if I figure it out Ill post so I don't waste anyone's time answering, so far I can not find a way to turn the feature off to get a basic fillet...any help ?
what is the name of that gold colored shaft with the grooves that enables the slider to move in that pattern? It's visible in the assembly at the beginning of the video.
Very nice! However, i wanted to create global variables for everything and works! The only thing that didn't is the angle of the teeth. When i change in positive values, works fine, but doesn't when i try in negative ones. There is some trick to change angles in global variables?
I have watched many videos on gear design and this video is by far the best explanation of how gears are designed and the use of equation tables to control size and number of teeth for a gear. The narrator speaks clearly, knows his subject and moves slow enough for viewers to follow the video. In my opinion the best tutorial on the subject I have ever viewed. Great teacher!
We are so glad you found this helpful!
This tutorial was amazing!!! So now, I need to build a pulley system that will lift my jaw off of the floor!
***** Hahaha this is awesome. Well done.
This is a great SolidWorks tutorial, with the one exception that these gears would explode in use. Gear teeth are nearly universally involutes, not circular arcs. SolidWorks even offers involute support. This can't be overlooked.
After the first impulse to agree, I googled it (but didn't get too deep into the matter) and found that actually the "Wildhaber-Novikov gearing" or "Circular arc gearing" seems to even have advantages over the common involute or zykloid teeth... But it is more complicated to manufacture - and so quite rare.
Anyway I guess that if someone is constructing "gears", he is going to buy them as standard parts. Or if he really makes them himself - he knows about involutes ;)
nice tutorial for using the equation functionalities however as a mechanical engineer here are some major faults in the design:
1- by definition the involute is never an arc, it follows sin and cos formula
2- the pressure angle should never be done as shown, it simply used to calculate the base diameter where the involute starts
3- the helical angle is also wrong, simply projecting a line is so wrong, it should be done with a "helix", the helix pitch depends on the helical angle and pitch diameter, for instance for 45 degrees its tangent is 1 so the pitch is 3.141 * pitch diameter
I didn't want to sound critical, but if you produce such tooth profile as indicated the gears will slide and won't roll.
they won't be efficient at all especially for molding plastic gears.
I have produced perfect gears geometries this way, it takes more time in the beginning but if you set your global variable as indicated it should be easy.
I will be happy to share my knowledge with the community
thanks
jean daher I had the same thoughts, jean. The method in this clip is wonderfully simple, and great for making realistic looking gears (as long as the "looking" is done from a distance) but it should be made very clear that gears modelled in this way are not functional.
Most people will not realise that the projected curve, in particular, produces a different result from a helix, and it is increasingly incorrect as the helix angle increases. A "crossed" skew-gear pair at 45 degree helix angle would make this very apparent, and the interference towards the ends of the teeth would be considerable.
A further problem is that, for a helical gear, the tooth profile needs to be swung around normal to the helix. Not that it matters for a "Not for production" visualisation of a gear.
+jean daher I am studying Design of Machine Elements, and one of my final assignment is to create a gearbox, which I have choose to use spur gear and I found your comments very accurate with what I am studying at the moment.Would you share how you have created perfect gear geometries? I am struggling at the moment in creating the shaft....
Sure, but as I said it takes some time upfront. SW is also limited since it always refers to the original coordinate system and disregard the new one. (I complained abut it, they admitted it but still not fixed)
1. start setting an equation for
1a-pitch diameter 1b- diametral pitch (module for metric) 1-c pressure angle
2. make a sketch for all relevant diameters driven by the equation, from previous you can set your number of teeth, base diameter, addendum etc.
3. now create an equation driven sketch, make sure you pick parametric with t1=0 t2=2*pi (it doesn't have to be 2pi but it is better to be longer than not enough)
set Xt=(base diameter/2)*cos(t)+(base diameter/2)*t*sin(t)
set Yt=(base diameter/2)*sin(t)-(base diameter/2)*t*cos(t)
you should have a full involute. after that just fix the curve, another bug with the software
the rest is up to you to make an extrusion based on that sketch and cut based on equation curve, create the cuts pattern from calculated number of teeth.
if you follow that you have a template that works perfect every time.
once you master that helical gear is similar however you cut the involute with a helical cut instead straight cut. the helix pitch will based on helical angle described in earlier post
hope that helps you
jean
Thanks a lot!!! Will give it a go today!
off chance that you will see this but i need some help with a gear design and wondering if you would be willing to freelance? 15t and 21t 3.25" on center
Holy Mackerel that was a great tutorial. I will have to watch your other videos. You are a GREAT teacher.
I've only ever played with Google Sketchup and auto CAD from like ten years ago but I fully understood the entire vid. you're a pro and I appreciate your thorough approach and solid focus. I hope to be able to get into solid works and learn more from your vids
huehue "Solid" focus
Through out years of looking for a proper gears video, this is hands down the best of the best.
Well explained and simple to replicate in any CAD software.
Thank you!
This is One of the best "How Tu's" of the power of Solidworks I've seen. Love the software and the schooling.
Probably the best explanation of how to make a gear, thank you so much!
The best tutorial I've ever seen for spur gears
such an amazing Tutorial. I'm a student at the moment and this helped both with learning Solidworks and learning how gear geometry works
this was the best gear design tutorial I have ever watched, so simple!
Thank you very much for this detailed tutorial. Even after 5 years, this is still a great tutorial to follow on when learning how to design gears in Solidworks!
Hi There! We are pleased to hear that! 👍 😃
Yes, it’s a great tutorial. I remember learning this in school, Solidworks class.
This was incredibly helpful! Thank you. I'm designing a 3D printed helical gear box and this just answered like 50 of my open questions.
We're so glad you found this helpful!
Literally the best tutorial I've ever seen. Great job!!!!
This brought me back to earth and showed me how little I really know. Brilliant tutorial, more of the same, please.
Most brilliant tutorial to learn about creating gears in solidworks ... So elegantly explained... 👏👏
Very nice tutorial, thank you very much. Just one small thing. At 6:39 you say the whole depth should be 2.40*m if module is finer than 1.25, and 2.25*m for coarser module. But should this not be opposite? I would expect a greater whole depth for a coarse module gear.
Wow, this video was great. Well spoke, directions and descriptions were clear also. Two thumbs up for me. Keep the videos coming. I like to follow along in solidworks and create parts to help me practice.
This is awesome. With equations you can even add conditions for the rest of the wheel, like making it solid or hollowed, the size and number of pins. Thank you.
I saw this video today saved on my hard drive. Wanted to find and like it. Thanks a lot for the tutorial
I only recently received a certificate as a SolidWorks Associate. This video was very helpful! Now making drawings for these two gear types won't be so troublesome.
That is really how to use SolidWorks. You are a true expert.
Dont forget that you can drop your driving sketch into every assembly and sub assembly, this lightens up the processing time in the main assembly and helps your computer to think in smaller chunks of information this helps stop crashes and opening and saving times.
BEAUTIFUL explanation! Loved the video. Thanks for sharing
The content of the video was very concise and to the point. Thank you for a well done presentation.
The best tutorial on the gears
Very informative thank you
Very helpful thanks. I needed to sketch a gear at work today and although it was something I routinely did in minutes ten years ago it had completely slipped my mind! Thanks for the tips!
Awesome tutorial. Helps learn a lot, amazing when you know the software how powerful it becomes
Really nice turorial... Helped me a lot. Thank you!
it was really help for my project. Thanks Mr. Jeremy.
Is is possible, if you could manage to produce a tutorial on worm gear? It will really help alot.
Your lesson is outstanding.
I am mechanical design engineer and honestly this is quite satisfactory video.
That is great to hear! Thank you for the feedback!
Dude... This is so damn awesome. You are a great teacher.
An excellent video! Thanks for sharing!
that was indeed a valuable tutorial
Very clear explanation. Thank You.
You are an amazing teacher
Wonderful tutorial to follow and learn.
Really helpful, I learned a lot from this.
Thank you very much for the lesson! It's nice to see some of the shortcuts that I've learned along the way can be done in a simpler more efficient way! Never used "derived sketch" before. Now I'll fully abuse thatcommand! :-)Can we see a tutorial on creating a continual "internal cam surface" that I can use in a motion study?
Very clear and precise instructions. Thank you! What adjustment do you have giving the solid a authentic material appearence?
thanks for such a wonderful tutorial
just an FYI, the gear as modeled produced interference when mated with an identical gear of ~0.2mm according to interference detection features. It would not be functional. I verified the equation outputs to be sure it was not a replication error.
Great job showing us the tooth profile generation & a gear that can have the helical twist adjusted within a sketch or simply making reference to a global variable as tooth angle/twist.
Could you produce a video teaching us how to build equation driven helical bevel / miter gears?
damn this guy just singlehandedly show you how to modelling gears the most efficient way.
Great tutorial, do you have any video tutorials on worm gears?
Awesome tutorial Thank you
Awesome tutorial!
MORE POWER!
Excellent very detailed video
How do I modify the sketch for outer diameter (5:46 in the vid) to make this an internal gear? Or is that the wrong way to do it? I've tried multiplying the module by -1 but that doesn't work.
ooh, change the equation to -2 of the # of teeth instead of +2. I love when you spend forever on an issue then figure it out as soon as you ask the question.
I'd love to see a video like this showing how to model miter/bevel gears.
Amazing tutorial, many thanks!
Thank you so much for this awesome video! :D
Such a life saver! Thank you so much. Great tutorial! Already Subscribed and Liked.
And again an awesome Video, thank you!
Would love to see more like this tutorials !!!!!!
This helical thing is all good, but ... if the derived profiles are not perpendicular to the projected curve, the tooth profile is being "squeezed" together as the helix angel increases, thereby compromising the profile and thinning the tooth along its width. - A better way would be to create the projected helix curve (as shown), creating a reference plane along (at the end) - and - perpendicular to the curve, and on here sketch the tooth profile and perform a sweep to preserve the integrity of the profile along the helix curve, no matter the applied helix angle!
If the gears are on the same plane, what angle would you use if you are meshing helical gears?
How do you calculate the center to center distance if you know what gear ratio and module you would like to have?
Great! Thanks~
great tutorial, very informative
Great Explanation :) Thank you!
I really like the way this was taught, I see a worm gear in the animation. is there a tutorial, you have posted, that shows how to make "worm" and "rack and pinion" gears
Please put video also for bevel and worm gear.
Is there any chance of demoing this similar process but building a globoid instead? Tks!
Hi!, Is a very useful tutorial, but please tell me. What is the difference between this method and the toolbox option?
When will Solidworks be available for Linux operating systems?
so looking through the comments a lot of people are saying this isn't mechanically correct. Would this spur gears design method be sufficient for prototyping out of acrylic or plywood with a laser cutter, or will they fail instantly?
A lot of people have said things along the lines of 'this is wrong, this is what you should have done' but what I want to know is why it should be done differently. Is it simply more efficient, or is it an absolute requirement that these parts be produced differently? Thanks in advance for any replies.
That is great! Thank you for this excellent tutorial
Hei, two questions:
*Will the teeth profile really be correct by using an arc?
*Couldn't see of the trajectory used for making the helical gear cut out really became a helical curve or just a straigh line in space, so, was it a helical gear that you produced or just a "lool-alike"?
Thanks,
Pontus
Can you link the previouse video please? Thank you
Love Equations and love you 1000 times 💕
I am wondering if for the outer diameter the equation should be = ("Number of teeth" + "Module") * 2 instead? Doesn't make that more sense or am I missing something? The way you presented it, you always have to go back and change the equation.
Your gear profile is a radius if I followed the tutorial correctly. How would your modify your procedure if you were to create a involute profile?
13:54 I didn't understand why 180 instead of 360.
edit: 1 hour later:
I got it, i freaking got it!
can u please explain it?
Can you please add a video on mating these gears too?
Thank you for this great effort
I have a question please answer me
I used all the methods to draw the model and all the methods that I used I think are unrealistic. Generally
The first question is do you think this method is the best for drawing gears??? If the answer is yes, then why does the width of the tooth appear to be wider than the reality if the number of teeth is less than 10???
The last question is, is there a law regarding the depth of the tooth? If the model is greater than 1.25, the formula is used [the model * 2.25] and the smaller one is [the model * 2.4], or is it worth experimenting???
Thank you
Hi there,
The place to start for direct support would be our User Forum. We have a team of experts in technical aspects of the software!
Hi,
I have a question for you. Can you please explain how did you set the angle of the arc for helical gear to 10 degrees? did you calculate it? or did you just randomly set that to 10 degrees?
Many thanks
DUDE you are amazing :D I study mechanical engirenig and i recived more knowledge about gears from you than from my proffesor :D
(Y)
Great video! Keep 'em coming! :)
good video. very clear. thank you
How do you make various boxes appear where your mouse is? What short cuts are those?
Intresting tutorial sir, one doubt why you create one circle above outer circle
thanks for tutorial
do you made something like this tutorial for bavel gear?
Great tutorial but my solid works stops letting me do anything else after i input the module vale =2mm... What could be the problem????
+Pedro Aguilar Could you post this to the MySolidWorks forum? It's a better place to get tech help on specific issues like this. my.solidworks.com/forums
Thank you for useful tutorial. Successfully goodness of life.
nice presentation
I have the following points for clarification:
1.How to create gears with actual involute profile?
2. @10.15 the profile curves were dragged to meet the root diameter. However, for gears with less than 43 teeth, base circle would be bigger than the root diameter. In that case what do we do?
3. Profile used for creating the spur gear can not be used for Helical gear. The profile used for Loft cut should correspond to the profile in transverse plane and not the normal plane.
I sincerely request you to make a detailed demo incorporating all the above mentioned points.
Ananda Kumar th-cam.com/video/uj7BnldaOSc/w-d-xo.html
Is there anything preventing me from setting the helix angle as a global parameter, then I can just input numerical data and get the gear. Thanks
my system won't allow me to add the details in the equation manager, when I do the "Module" it will only allow me to ad a 2 without the mm notation, if I add the mm it fails to allow me to do anymore, if I leave the mm off, I can just add a 2, is there an add-on I am missing ? or something else in setup you had already done. I did make a Metric tab for my parts template, seeing yours was modified.
I learned a lot thank you
Worked out all my issues except now I cannot add the equation for the two filets at the bottom of the cut, I am getting Filletxpert, instead of the basic fillet, I turned off Featurexpert, but still only allows basic numbers no equations, if I figure it out Ill post so I don't waste anyone's time answering, so far I can not find a way to turn the feature off to get a basic fillet...any help ?
Hi! Great video! is it possible to carve out a cyclic section (with one tooth) for a 3d cyclic FEM simulation?
what is the name of that gold colored shaft with the grooves that enables the slider to move in that pattern? It's visible in the assembly at the beginning of the video.
Two words:
Fucking BOSSSSSSS
Thank you!
Very nice! However, i wanted to create global variables for everything and works! The only thing that didn't is the angle of the teeth. When i change in positive values, works fine, but doesn't when i try in negative ones. There is some trick to change angles in global variables?
Greetings, Does this also apply to internal helical gears as well? Thanks
You also could make a global variable to the angle, and if you use 0 deg you'll have the first example...
i am using solidworks 2011 but i cant find manage equations option in equation dialog box neither the global parameters..how to fix this ?