Spur Gear Design 1 - How gears work

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.

[irondan]

I'm not quite sure how to fully convey the extent to which this series of vids saved my ass

[absolute]

Simple, Elegant and efficient explanation; clear and concise visuals !

[kevinli]

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).

[ramkumarr]

Nice video. Keep uploading more videos..

[stephenchong]

Do you write a book, I have great interest to buy one!

[zesegatto]

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?

[thriehands]

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??

[jackroom]

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

[Alzexza]

How does one calculate Alpha or is that a selected value?

[moto_dras]

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?

[rbffr]

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.

[diasakimbay]

Is there an explanation for ring gear? Since it has reversed teeth relative to the planet gear. Btw, this video is very helpful!

[jacobeason]

When you calculate the module from Pi and the circular pitch do you use radians?

[pipaliyamahir]

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 ??

[jethavavijay]

Please video upload inner gear teeth with pin dia.

[thistemba]

3:22 Should be "pitch circle minus two times the dedendum"

[irondan]

i somehow ended up calculating a base circle thats smaller than my clearance circle

[ryanb]

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...

[douggale]

Normally I love engineering stuff, but gears are like nails on a blackboard to me. The "module"? What a load of crap terminology.