Worm Gear (Worm Drive): What is it, How it works, why huge velocity ratio and mechanical advantage?
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- Опубліковано 27 сер 2024
- In this webcast, we define what is a worm gear aka worm drive. how does it work? We used a worm gear model to show its performance, performed tests to determine the mechanical advantage and velocity ratio. How friction may play an important role in mechanical advantage and overall efficiency.
#Worm_Gear #Worm_Drive
Thanks for the video. I was able to use it to demonstrate to some FIRST FRC students why a worm gear setup is sometimes easier to use for lifts. No brakes or stay pins required.
You're welcome.
Apologies but it is possible to drive the worm drive by rotating the main wheel, much depends on the pitch angle and whether it is a single or multi tooth drive, yours looks like a single. Also note that these power transmission systems are not technically gearboxes but mechanisms as they depend on a sliding interface between 'teeth'. Friction is not a fixed balue but a variable that depends on RPM. Friction is higher on startup as is noted in your video. This is due to the static coefficent of friction being higher than the dynamic coefficient of friction experienced once the mechanism is moving.
thanks
Your lab experiments are really helpful to understand the working of gears. Best of Luck👍👍👍
Thank you Vipin
Thanks ton, great explanation
Thanks a ton, for using actual wait and gear in your video it makes it a lot easier than going through virtual demo
Always welcome Shahin. I am glad that it was helpful.
Really Helpful, Thanks a lot Sir.
You are most welcome
In my application I required 1 way only. I got confirmation from this video. Thanks.
You're welcome
Well presented. Thank you.
You're welcome.
darun explanation bhai
Thank you
Based on that fidget spinner this guy is clearly stuck in inception!
:)
Did you build the components used to depict the mechanics or is that an experimental kit? If the later, do you have a source to the kit?
Thank you. Very interesting and informative video!
It's an experimental kit: ES 13, Gear Train Kit, by Tecquipment.
@@MohammadShafinulHaque Thank you. Very helpful!
@@bityote you're welcome
Thanks so much!
you are welcome.
I like this video. it is neat..
I am glad that it was useful to you.
Thank you for this video!! Life saver :)
You're welcome!
Good lecture
Thanks. I am glad that it was helpful.
Good presentation. How do I back drive the worm wheel?
Due to the worm gear teeth arrangement and the way friction works a worm gear can't be back-driven.
@@MohammadShafinulHaque sorry but I think youre wrong. Thanks
Thanks sir your class easy to learn
But I have a suspect
1) if I can use "brack motor" or servo motor, can i use warm gear ?
2) if I can use suddenly run reverse forward, can I use warm gear?
I think you can use motor and rotate CW or CCW as long as you use the worm gear as the driver that is paired with a spur gear.
Just as a note, your experiment has a flaw: you are not measuring the actual mechanical advantage. The reason for the worm to start rotation so late is that it is engaged in 'static friction'. Every time you add a weight, you should rotate the worm a nudge to free it from static friction. If it doesn't continue the rotation, then add another weight. This can be also stated as the reason that the mechanism suddenly falls at great speed instead of a steady rotation, because there is too much weight on the worm side to warrant an equilibrium under dynamic friction. The difference between the measured mechanical advantage vs. the speed ratio is just too high with your experience, and the efficiency of the system is around 7% which is not justifiable by any means.
🔥nice
Thank you. I am glad that it was helpful.
hai brother
i need to design and fabricate the worm gear from 3d printer can give some refers to me how to design worm gear in requested size and also it the application for gripper in robot arm
can you please some refers for me to bulit it
there is a lot of resource available on the web, I use a textbook Norton, Robert L., (2014), Machine Design, (5th Ed.), Pearson. I think there is many free or low cost book available too.
I want to calculate the amount of degrees a worm wheel will rotate if the 3 mm pitch worm is rotated one turn. The center of the worm is 85 mm from the wheel center.
For a one-start thread, one turn of the worm will rotate the wheel by one teeth. Now you need to find the number of teeth of the worm wheel. Then divide 360 with the number of teeth of the worm wheel.
@@MohammadShafinulHaque Thanks man. I sort of had this idea but wasn't sure. It now makes sense.
@@pieterbotes8938 you are welcome.
@@MohammadShafinulHaque when talking about teeth, and you are talking about just one, say tooth. Tooth is the single form of teeth. Also, in your video, it sounded like you said revelation (reh-veh-lay-shun), when you meant revolution (reh-vuh-loo-shun)
@@jsmith5443 thanks for the corrections.
You know when you drop something the force is greater than the weight alone?
you are right, but the worm gear was not smooth and there was some friction between the thread and drum that depends on how it was wrapped around the drum (for example whether the thread was overlapped or not) and the wrapping is not the same for every trial. The drop overcomes that static friction. Plus it is a demo kit and not very accurate. Again I congratulate you for your very good input and analogy.
wich is the precision?
You're question is not clear to me, can you rephrase your question?
All I can pay attention to is the blue fan.
Thank you. It's a fidget spinner.
👍
You're Welcome.
Thanks
Your welcome
Dis worm and worm gear shopping
This is a Tecquipment Gear Train Kit
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Thank you
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Thank you