Spur Gear Design 1 - How gears work
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- เผยแพร่เมื่อ 23 พ.ค. 2020
- How to design interacting or meshing gears of different diameters, identify which characteristic controls the gear ratio and why the module is important. The relationship between addendum and dedendum in terms of clearance is also discussed.
This video details characteristics of gear design including the top land, face, flank, bottom land, gear tooth profile, pitch circle, circular pitch, dedendum, addendum, whole depth, addendum circle, clearance circle, root circle, base circle, pressure angle, line of action and angle of interaction.
I'm not quite sure how to fully convey the extent to which this series of vids saved my ass
I’m glad to help. It’s good to know it’s useful. It helps in making more
Simple, Elegant and efficient explanation; clear and concise visuals !
Nice video. Keep uploading more videos..
Great explanation 👍
Love from India
Helps a lot indeed, thanks💯👍
Great video to explain the basics. Bear in mind that some parameters and relations used in this video are for "standard" gears. In some industries, there can be heavily customized gear designs (although those designs may not be optimal).
I think the basics are fine for this video. I’ll try some of the other types in future videos
It helps a lot, thanks
amazing video, thank you
2:27 Is module and addendum the same thing?
I've seen module is used instead of Diametral Pitch for milimeter gears. It's equal to Pitch Diameter (in mm) divided by the number of teeth.
Addendum is the radial distance from the pitch cicle to the top of the tooth. It's equal to 1/Diametral Pitch.
Am I wrong?
Thank you a lot.
Hi there, loving this, great explanation! But I seem to have got stuck on calculating the base circle. The equation needs the angle interaction, but that is calculated by using the base circle… Do i just choose a number between 15 and 25 degrees?
Try different angles to find the best fit for you needs
So essentially to work out the overall diameter and size of a wheel (the addendum circle) just do the pitch diameter + 2 * module ? Great video btw
Yes. Just remember the two gears intersect at the pitch circle so when calculating where to place the next gear they should connect. The overall diameter is useful to know for assembly to make sure it doesn't clash with other parts
@@PDWCreative thank you, most helpful thing I’ve found online on the matter!
thanks
When you calculate the module from Pi and the circular pitch do you use radians?
You need to base the module and number of teeth on the design requirement. So consider your gear ratio, size constraints and whats practical for the design problem your attempting to solve.
How does one calculate Alpha or is that a selected value?
Do you write a book, I have great interest to buy one!
Is there an explanation for ring gear? Since it has reversed teeth relative to the planet gear. Btw, this video is very helpful!
It’s on my list of videos to make
When pressure angle is 20 then maximum number of teeth is 41. Above 41 the base circle falls below dededendum circle. can you tell me how gears with large number of teeths are made. Are they involute or any thing else.
Try a different pressure angle and module combination. There are lots of different tooth profile types. Involute is one of the more common
Only thing I don’t get is the BASE CIRCLE - Pitch Circle x cos. So if the Pitch Circle 10 and cos 20 calculation is 10 x 20 = 200??
10 * cos(20) = 10 * 0,4 = 4
Hi. I need a 11 T gear and other 50T gear. 11T max diameter is 20mm and 50T max diameter is 170mm
How to design them ? I mean what should be module and other parameters etc
It looks like your limited by the smaller diameter. So your larger gear will be much smaller than 170mm. If the addendum circle can be no larger than 20mm, a module of 1.5 is the largest possible combination. You need to decide on whether this module and the pressure angle option is appropriate for your application. You may decide to go for a smaller module and therefore both gears will be smaller.
You need to also consider the mechanism these gears are going into, what material the gears are made from, whether they will be strong enough and how well supported they are by the axles.
@@PDWCreative thank you for the reply and valuable inputs. I'll look for these parameters.
I found an online calculator at hessmer org. For my to be strong it seems that CP needs to be at least 6.
You are correct that the gears need to be strong.
Am going to use them for DIY FFB steering wheel.
Of i want make design 86 dia circle ???how to devide a no of teeth..what is the addandm,dedundm and circular ..can u explain ??
You will need to base your design around the desired diameter and calculate the other inputs as variables. It sounds like you need to go through the video and decide which other parameters are important for your design.
Please video upload inner gear teeth with pin dia.
But it is clear from the picture that ( 2:57 )
Addendum= pitch circle + Module
please explain
I'm not sure what the question is here. Can you give more details please.
@@PDWCreative I'm sorry, I didn't understand the concept of module properly.
@@MainCharacterDotX I have same problem.
Can you explain me?
Why is Addendum Circle = pitch circle + 2 * Module ?
I realized.That is because Addendum Circle is diameter not radius.That is why it is 2 * Moule.Pitch Circle is also diameter.
@@vladimirkitanov3779 thank you so much. It was really bothering me.
What is mean by module
It’s a term used in gear design
3:22 Should be "pitch circle minus two times the dedendum"
I see the confusion. The video shows it is pitch circle minus two times the dedendum which is correct. But the audio sounds like I'm mentioning the addendum. Please just follow the calculation laid out on the screen for this point. I will make a note to point it out on the video.
Please can you add russian subtitle?
i somehow ended up calculating a base circle thats smaller than my clearance circle
It can sometimes work out smaller. There is an example in video 3. Try modifying it to your inputs
Hello sir good morning
Is there easy hack how to calculate it all, without machineries handbook and all the redundant relashonships, with half of the symbols having no expression or knowable meaning. AM cave MAN dammit. Want to fly like bird. And too many mathspeak pencil neck make want to club and eat your cubs... JKG. I love the topic and the videos...
You could do all the calcs manually and just input the values for each dimension. Also if you set an excel spreadsheet to auto calculate based on tooth number and module it would make life easier for you if you ever want to make a second gear.
Normally I love engineering stuff, but gears are like nails on a blackboard to me. The "module"? What a load of crap terminology.
I’m sure there’s a reason the the naming. I’ve never looked into it