Recent content by cherish

One of my favourite book for mechanical design is "A text book of machine design" by R.S. Khurmi & J.K. Gupta. Especially the approaches for calculating bolt connection with various examples are very userful.

Just checked for an example of thread M20x2.5 & thread engagement depth 20mm, axial force 100 kN, approach in post #6 has equivalent stress 158 MPa while beam theory is 189 MPa, about 20% higher.

Thanks @Lnewqban, I found a picture and a case study on the "beam theory": https://www.researchgate.net/publication/285462605_Loading_and_Contact_Stress_Analysis_on_the_Thread_Teeth_in_Tubing_and_Casing_Premium_Threaded_Connection/link/618bfe4107be5f31b76386eb/download But not find reference...

Hi @Baluncore, Does the area you mentioned is used for calculating the surface contact pressure of the mating area between threads? One of the approach I have seen is checking the thread using beam theory. Then we check equivalent stresss of the thread which includes shear & bending. I will...

Hi lnewqban, I got a picture from Honda that looks a bit different, maybe it varies from manufacturers, or the illustration will not be an exact like between 12mm and 13mm

Dear all, I am very appreciated with all of your guidance and especially comment from Baluncore are very clear for me now. I have came back to the guy who made that statement to get more clarify and he assumed the noise might come out during rotation without carrying load (the one he...

Dear Physicsforum Mentors, For a pinion and gear wheel, the face width instead of 12mm for both, it should be 14mm and 12mm. The explanation I got is, when there's 0.2mm deviation in axial, then only 11.8mm width will be in meshing. later, when the system be worn out, that 0.2mm will be in...

Hi everyone, @Chronos: this is the free end of a winch drum then a keyway maybe not used, and the cylindricity as well as perpendicularity tolerances are 0.1 mm, both material grades are equivalent to EH36. @Q_Goest: You're absolutely right, at the first time we did not carry out...

Assemble "shrink fit" with a big shaft ∅203 mm? Dear all, Just a short question that is it possible to contract the shaft in liquid nitrogen and heat up the hub around 300°C so that we can assemble them together quickly? We are delivering a prototype to our customer with a tight requirement...

http://upanh.com/view/?id=5rt8bs0jesd my cats...

Yes, first to say that this's really a basic matter but I've found all around a week & still facing difficulty, hope someone has patient to help me an answer then i can go further myself :wink: As in the attached picture, a few ones have done their calculations & showed the different wall...

hi Studiot, certainly this's not coursework, just a small problem that i design it for a gearbox. First time i try to use 4 M6 as mentioned above & my boss agreed with solution but later i found a guide from catalogue they using 2 M12 in stead as picture attached, just a bit wondering that the...

Hi there, I'm not sure that using the same type of 2 bolts M12x1.5 (L=30mm) or 4 bolts M6x1 (L=25mm) & place equidistant in a circle as picture below, which can bear force better & why? Thanks many in advanced! [PLAIN]http://img824.imageshack.us/img824/7971/123ok.jpg

Hi all, first to say sorry if the question is repeated second time I've order a couple of internal gears from Rollix as picture below: http://img155.imageshack.us/img155/5996/centerdistance2.jpg The calculation from them for internal gears with center distance C=331.494 (mm) Backslash at...

Hi, thanks a lot, now it's very clearly, and very exciting answer, i'll quote your illustration and send them now ;)