L6.10 Friction || Concept of Screw Friction || Engineering Mechanics|| helix angle || UG 1 yr course

Friction in screw, bench vice, screw with lever arm.Helix angle in screw friction, relation between effort and load
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DAlembert Principle: Basic Introduction Numerical example

[@sarthakgaur8018]

i needed this kind of explaination for this topic before my exam. thanks

[@anuraganand6675]

Ur way of explanation is outstanding sir.

[@exdrip]

Friendly Correction: You miscalculate your first alpha angle, you divided the lead by (2*pi*diameter) instead of (pi*diameter). You got 7.2' instead of 14.2'. And GREAT explanation...thank you for doing this!!

[@prakification1]

too good, not even nptel website showed clear reason for why the exerted force is considered acting parallel to the base of the triangle. keep up the good work.

[@ashishpurohit9138]

Thank you

[@ashishpurohit9138]

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[@akshaykayapak8209]

Deep respect for your noble work sir..I have never seen such indepth n simplified explaination.Lots of purest n honest blessings for u n ur family.Thank u so much respected sir.🙏

[@ashishpurohit9138]

Grateful for your wishes and thank you Dear

[@ashishpurohit9138]

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[@elishaadiburoadimalara4687]

Watching from Ghana Sir you are simply kudos Thanks for the perfect explanation

[@ashishpurohit9138]

Thank you Dear Elisha...

[@elishaadiburoadimalara4687]

Sir please keep doing more to save souls like myself

[@nishuranjan6601]

A examsaver!! Thank You Sir

[@ashishpurohit9138]

Thank you

[@dennisrose40]

Amazingly clear and very visually and mathwise understandable!

[@ashishpurohit9138]

@Dennis Rose: Thank you

[@ashishpurohit9138]

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[@sonakshijain9813]

awesome way of explaining sir !!!

[@arjunverma9803]

very nice video to understand square thread friction

[@MANISHKUMAR-ib3zq]

Thanks my main concern was to understand helix angle and you explained it easily

[@ashishpurohit9138]

Thank you

[@pmsshashank4925]

Thank you so much, very helpful

[@ashishpurohit9138]

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[@naeemsiddique__]

Very well explained in a short and simplified way

[@ashishpurohit9138]

Thanks

[@ashishpurohit9138]

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[@Husain97]

Bhai bahut Accha vedeo LGA tnk u

[@Jitendrakumar-gb7cn]

1 video bnane ke liye itni mehnat thnx bro

[@ashishpurohit9138]

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[@siddharthshankar2106]

THANK YOU VERY MUCH SIR

[@LiftLink33]

u are a good teacher .thankyou

[@beoptimistic5853]

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[@ashishpurohit9138]

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[@abdurrahmankhaled9212]

You are so smart , thank you

[@ashishpurohit9138]

Thank you for appreciation

[@andersonpinesso2812]

Thank you very much for your clear explanation

[@beoptimistic5853]

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[@rajibdas1087]

very well explained sir...

[@ashishpurohit9138]

Thank you

[@tusharverma4202]

Sir, why we haven't used the formula for loosening the screw. ie. tan(phi- alpha) ? if we tighten the screw ,should it not make the weight go downwards?

[@ashishpurohit9138]

No Dear Tushar, it is not related to direction of movement of load..it is decided by direction of motion of screw and direction of external weight..if you are lowering screw and compressing something means the load is opposite to the movement of screw. If still you have doubt...share your no or mail I will explain there

[@abdomenebadellah]

Clear demonstration,thanks

[@ashishpurohit9138]

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[@BodhisatwaSinha]

thanks

[@theunknown0154]

Sir,pls don't use left right stereo mics[recorders] (also there is increase and decrease of ur voice) cause it pulls away my concentration...sir,it is my request....but very good explainationn👏👏👏👏👏

[@ashishpurohit9138]

Dear Vamshi, actually I used mobile phone without mc phone, thus the prob may appear, I will try not to modulate voice. And thank you for appreciation

[@medhawinikapoor4735]

thanku very helpful

[@sumitpatil3832]

What is the relation of No of threads in contact of screw and nut together with applied load.

[@faseeghmarcus8763]

Gonna use this in a torsional split hopkinson bar. Hopefully the maths is the same.

[@beoptimistic5853]

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[@ashishpurohit9138]

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[@marietheresehanna7685]

hello can someone explain to me how he end up with the p=w(tan phi+alfa) formula?

[@UnCensoredShivanshgjhg]

Thankx Bhai.....😊

[@ashishpurohit9138]

thank you Shivansh for appreciation.

[@mea009piyushraj8]

THANK YOU SIR, YOU DIDN'T EVEN ASKED TO LIKE OR SUBSCRIBE

[@hrkalita159]

Thanks for sharing this video🤣🤣

[@ashishpurohit9138]

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[@piyushsharma6454]

Thx bro👍👍👍

[@vaibhavsaini4408]

thanks sir

[@mea009piyushraj8]

OUTSTANDING SIR,

[@beoptimistic5853]

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[@ashishpurohit9138]

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[@vignesh9269]

sir but why did u take P parallel to base ...to produce a moment/torque u r supposed to take the force(P) perpendicular to the axis of rotation...???

[@ashishpurohit9138]

Yes the force will be perpendicular to the axis of rotation, that is also in a plane perpendicular to the axis or parallel to the base of the screw. If sill you have doubt, please share your mail ID, I will explain through some diagrams.

[@vignesh9269]

@@ashishpurohit9138 [e-mail]

[@o3024]

Nice leacture. But why you considered the distance of movement as pi.d not 2.pi.d?

[@ashishpurohit9138]

can you please specify the time instance..is your question is for level or else..plz specify time instance.

[@o3024]

At 3:20 but seeing again you considered the distance of fillet thread movement as 2.pi.d and pi.d as side dimension of the triangle, did you?

[@ashishpurohit9138]

I guess the movement of the screw is equal to pitch/lead, therefore it is the perpendicular of my unwrap thread, however if I will see the base of the triangle, it is the periphery of the cylindrical screw.

[@ashishpurohit9138]

Actually this triangle is made by unwrapping a single thread, if you imagine a cotton thread used to wrap on a cylinder in helical way, the screw thread will form, now if you unwrap a single thread, the given triangle will be formed, hypotenuses of the triangle is the actual length of cotton thread, base of the triangle is the pi*d length and height of the triangle is the pitch/lead (distance between two consecutive thread). helical

[@charlieabbot3649]

Ashish: I need to hire you for a project I am working on. We need to lift 25tons with a screw jack for a range of 8'. How can I get in touch with you? Thanks CA

[@ashishpurohit9138]

Dear Charlie Abbot, either mail [e-mail], or my no [phone]

[@koushikkoushik6085]

the way of explanation is good and u r little fast at last problem

[@ashishpurohit9138]

thank youy

[@ashishpurohit9138]

Complete lecture serie of mechanics for your refernce kzbin.info/aero/PLi0hoi2vOpnQ1wu7w4CMSUobzKuWIEThQ

[@aadityachaturvedi3937]

Sir why didn't we use phi - alpha formula?

[@ashishpurohit9138]

Can you elaborte

[@aadityachaturvedi3937]

Sir in the last question

[@aadityachaturvedi3937]

The tension T2 in the wire will move the screw in the upward direction if the equilibrium is disturbed, but how do we decide which formula to use here?

[@ashishpurohit9138]

@@aadityachaturvedi3937 in screw, we always decide formula based on the direction of load and direction of motion of screw. if both are opposite (which is the most common condition), we use positive sign formula (theta + phi) visa versa. here also both are opposite.

[@aadityachaturvedi3937]

@@ashishpurohit9138 sir direction of motion of screw i understand is left or upwards....but what is the direction of load??? The tension is still upwards only 🙏🏼

[@hatmta]

Why p=w.tan(phi+alpha) . Are you explain ? Thank's !

[@luccamartinelli5652]

it makes no sense

[@beoptimistic5853]

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[@ashishpurohit9138]

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[@fahimshahoriar1057]

sound quality is not good

[@SumanSuman-bh8ws]

Nice work pundaee

[@roma10011]

It's useful Please I need the design for power screw for manual press get force 30 ton , can you support me

[@gchinmaya9371]

You are going in higher speed sir

[@ashishpurohit9138]

May not be in all video..this video may be

[@gchinmaya9371]

But enjoyed the session sir

[@lakshaygarg5743]

awesome

[@luccamartinelli5652]

your force diagram makes no sense, first there is ALPHA and then you add PHI in the equations out of nowhere, where did this PHI come from?

[@atulraj3189]

Improve the quality of audio and video. It's too distracting

[@ashishpurohit9138]

Dear Atul, thank you for the comment, actually this video has been made with a mobile wherein due to intermidiate disturbance audio quality lost. However in other videos you might not notice distraction. This video has this problem, which unfortunately I cannot change unless I will record it again.

[@pranavchat141]

@@ashishpurohit9138 Ashish, very good job. I saw some other videos but the way you have put the whole concept was far better than the other videos. You see, genuine aspirants do not care about quality of audio or video but the quality of content. Thanks

[@mirawesh4391]

Triangle kahan se ayyya

[@ashishpurohit9138]

Dear Mr. Mir please specify time instance when you have doubt about triangle OR please elaborate your doubt.

[@mirawesh4391]

@@ashishpurohit9138 2.25 se 2.45 .sir reply milega socha nhi thha. Bht achha explain kiya hua hai. Thnxx sir

[@ashishpurohit9138]

@@mirawesh4391 Agar hum kisi ek ( only one) thread Ko open kare to how it will look..like a slant slop and slip ki height pitch hogi. Agar slip ka angle nikalna ho to make a triangle candidate get tan( theta)