LEWIS BENDING STRESS at the Teeth of a Gear in Just Over 12 Minutes!

[@mohamedshinaishin2822]

You, without doubt, deserve a like

[@EvolventDesign]

Ratchet Gears do not rotate in their intended service purpose. These gears (and the associated pawls) are often on one or both sides of winch drums used for lifting with a coiled metal cable or rope. Their fluid analogy is a check valve, their electrical analogy is a diode. But it is true - gears that are normally used to transmit torque are under load while they are rotating. Excellent and clear presentation - SUB

[@dr.ibrahimshaikh1325]

I can't resist but subscribe....... very lucid explanation!!!

[@LessBoringLectures]

Thank you!

[@mateoichijo3408]

So let’s say I have a motor that is 2000 watts and I calculated that the maximum power that can be transmitted in my gear is 2500 Watts. Can I say that the safety factor is 2500/2000 = 1.25? Such a great video by the way! Thank you

[@AlessandroEren]

would be cool to have a video with all the K coefficients

[@LessBoringLectures]

Those will be coming in about 2 months.

[@abidmorshed5980]

just what i need before exam

[@sinankunkut7257]

the yield strength of 1020 steel is written as 350 MPa in internet, so what unit does 30 has at the solution of the example problem?

[@dsaun777]

What type of software do you use to make these drawings?

[@ericvilleneuve8396]

Usually Steels have similar tensile and compressive strength (or higher tensile strength) why do you assume they have lower tensile strength?

[@aaronlevinthal6253]

Do you need to consider stress concentration factors Kt at the fillet of the root of the tooth?

[@impactodelsurenterprise2440]

When using the material's yield strength to calculate the bending stress, do you use the surface yield strength or steel core yield strength value in the case of case hardened gear?

[@AlessandroEren]

why would I choose a spur gear instead of a helical one? Is it just about noise?

[@LessBoringLectures]

Angled teeth contact is more gradual, so helical are more silent. And they also last longer because of this. Either that, or they can handle higher loads. Of course, they generate thrust, which require thrust bearings. Also, as you can imagine, the manufacturing of helical gears is more expensive than regular spur gears.