Problem on Design of Key - Design of Shafts, Keys and Couplings - Design of Machine
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- เผยแพร่เมื่อ 3 ส.ค. 2024
- Subject - Design of Machine
Video Name - Problem on design of Key
Chapter - Design of Shafts, Keys and Couplings
Faculty - Prof. Zafar Shaikh
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For the doubt of why length = 1.25d, this is because, it is a condition that the key cannot be greater than 1.25 times the diameter, so we assumed it to be equal to that and followed with the calcs.
Can we use 1.25 in every question??? Plss tell
@@sachinsingh1237 I believe if its not specified you can.
It was supposed that 1.25 of d , you can consider whatever value but a legitimate value .
super great work sir,I will be coming often to this channel until I complete my degree
Thank you sir for providing this video. Right now my all doubt is clear.
thanks for your help.
sir for rectangular key w = d/4 and t = d/6 as per textbook of machine design by r.s. khurmi.....what is your point of view about this ??? waiting for your answer
w=d/4 is for square key
d/4 is used in square key and d/6 is used for rectangular key
I think the correct procedure is .you have to find the dimensions using calculation of stress and then compare with standard dimensions of proportion and take the maximum value for safeness.
this is one of the reasons why I love the comment section, because I saw this on the textbook as well and now I'm confused
Thank you sirji
Thank you for this amazzing explanation
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great work sir....for making our problem easy and helpful....
find the length of square key size d/4 such that the shaft and the key are made up of same material
Answer please
Width is less than the thickness , but u said for rectangular key width should be greater than thickness, can anyone plz help me
Length of key =1.25d not shaft length
A steel shaft has a diameter of 25 mm. The shaft rotates at a speed of 600 r.p.m. and transmits 30 kW
through a gear. The tensile and yield strength of the material of shaft are 650 MPa and 353 MPa
respectively. Taking a factor of safety 3, select a suitable key for the gear. Assume that the key and
shaft are made of the same mater
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Excellent Sir
Thank you for your words!
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hllo sir calculate ve naal kro plz answer na likho sidda plz kyu ke mere answer aunda ni thunda wale numerical da plz vo batna plz vasse lecture bht vdia. good luck
Sir the crushing stress is applied on total thickness of the key but why we consider it as t/2.
Thickness is divided two parts t/2
The effective area being crushed is only half the thickness (quarter from top LHs, quarter from bottom RHS = half)
very important question for torsion Anna university exam
Yes it is very important.
Sir ..volume problem
Plz tell the reason for each step
alot of confusions why did you take shear stress for shaft and key same while it is not stated in problem and crushing area that you have taken is that of only one face why? while when the crushing force will be applied both the side faces will come into contact plz clear my concept as soon as possible
How crushing area is taken?
In my text book ans of W=6.91
and l = 142mm
Tech max book
Hello sir i am interested in designing machine elements for a machine we are trying to build.
We will like to work with you
In one of ur lectures u said l= 1.5×d
Sir can you explain me the reason behind the length of the shaft = 1.25d ?
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You can use the design data handbook which gives the emperical formula that ensures safety. By convention the length of the key is usually taken based on the diameter of the shaft as mentioned in the design data handbook in that, length is 1.25d
thanks. i forgot about the databook
For rectangular key,
L= 1.25d
@@sitaramgarg690 But Data hand book is not allowed to examhall😓
sir standARD KEY CROSS SECTIONS ALREADY AVAILABLE so why need to the finding width and thickness
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Design a key for fixing a gear to a shaft dia 25 mm KW of power at 720 rpm is transmitted from the shaft to the gear .The key is made up of steel 50C4.the yeild strength in compression can be assumed to be equal to the yield strength in tension
wrong length and thickness is determined, As t=10mm & l=117.7
refer RS KHURMI
I found on some books L=1.5d
Sir please jo bhi videos design of machine Ko aapne chupa ke Rakha hai use bhi open karo samjhta nhi hai ek dekhne ke bad dusra AAP chupa lie ho to doubt hota hai. I hope ki use bhi public karoge.
Length direct hi 1.25l kyu li h
it is standard that length is 1.25d
Your voice is not audible...
Please speak loudly 🙏🙏🙏🙏🙏
Can you believe that someone has accused me of murdering with one key? I am not that stupid. Why? The Definition!
Why not avoid keys in the first place! They are the weakest point in the design! Why not make a coupling system or like a shaft connects to a hub type of design ?
Sir voice is too low
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