size pins

[danny1204]

I am here because at school the subject has not been explained well. then there are the bearing and thrust pins, the bearing pins can be of end or intermediate (1-difference in dimensioning ?).
, can we dimensional by diameter or by (2-differences in the sizing ?). I don't know how to use them.
3-mi you can attach various methods to size these types of pins.
4-exercise:size the push pin of a crane with a rotation speed of 5 rpm and exerts a force of 600 kn. I used m= 0,4 _ pamm= 10 n/mm^2 _ k= 250000 n/ mm*min . to dimensional the ralles I used the following formulas

 

[Stan9411]

google.
http://www.edutecnica.it/meccanica/alberi/alberi.htm(p.s : it is not very nice to shoot cold questions. for the next time I suggest you ask starting from the exercise that creates problems, propound your draft solution by posting the steps and then indicate where something is not coming back)

 

[meccanicamg]

on the forum we have already discussed it in several posts and would just do a search....
however I carry the formulas to use for the sizing.I remember that dimensioning is done with any method, including knowing randomly.
what is important is the verification that must be taxed.
a tree is a tree and as such it is necessary to see that stress there are.
on the literature distinguish the pins of extremities from the intermediate ones for the absence or the presence of a moment.
for the axial head pins is evaluated surface pressure, heat disposal and wear....with the bronzine.

 

[danny1204]

on the forum we have already discussed it in several posts and would just do a search....
however I carry the formulas to use for the sizing.View attachment 54691I remember that dimensioning is done with any method, including knowing randomly.
what is important is the verification that must be taxed.
a tree is a tree and as such it is necessary to see that stress there are.
on the literature distinguish the pins of extremities from the intermediate ones for the absence or the presence of a moment.
for the axial head pins is evaluated surface pressure, heat disposal and wear....with the bronzine.View attachment 54693View attachment 54694

I've been looking for a lot but I haven't found a lot of useful things that I came here for. I tried to solve this way, you can control it. I looked at the file but there are some things I don't understand about some formulas of the pins.

 

[meccanicamg]

The books of the zanichelli have free reins tabs online. See you qui.
and these below are the verification formulas so if the calculated values are lower than the limit values, you have that the thrust pins are verified.

 

[volaff]

if interested in someone I have the book of the zanichelli in object

 

[danny1204]

The books of the zanichelli have free reins tabs online. See you qui.
and these below are the verification formulas so if the calculated values are lower than the limit values, you have that the thrust pins are verified.
View attachment 54701

if interested in someone I have the book of the zanichelli in object

Thank you very much, but for checking which radius I use? the average or the outer one of the saddle?
you could watch exercise if it is done right, more than other formulas (if I used them correctly.
thanks for the book if it succeeds I care about the part on the size of the push pins.

 

[meccanicamg]

the rays with the pedics are referred to the diagram below where the anular pins are spoken to one or more thrust ralles.as I gave you the link to pdf, I expected you to have the desire to read three banner pages....

 

[danny1204]

the rays with the pedics are referred to the diagram below where the anular pins are spoken to one or more thrust ralles.View attachment 54714as I gave you the link to pdf, I expected you to have the desire to read three banner pages....

no,no, I just looked at this page to size at admissible pressure, then I did check at heating and eventually I calculated h. I followed these steps. Are they right? .
a

 

[danny1204]

if interested in someone I have the book of the zanichelli in object

the rays with the pedics are referred to the diagram below where the anular pins are spoken to one or more thrust ralles.View attachment 54714as I gave you the link to pdf, I expected you to have the desire to read three banner pages....

for hollow trees how do I (cylinder ) what formulas do I use?

 

[meccanicamg]

for hollow trees how do I (cylinder ) what formulas do I use?

those of post number 8.... only that you have only one push ring.

 

[danny1204]

those of post number 8.... only that you have only one push ring.

but when I have to dimensional an end pin to admissible pressure as I do since I do not have k (I have f and sigma ammf)

I have replaced in formula 2 (the one for dimensional stress ) instead of l have put the formula for admissible pressure getting =

diameter = (quartical index √(5*f^2)/(sammf*pamm)
I also attach the photo
exercise in question is this, and I have doubts also on intermediate pin (I leave it equal to that of the tree since I have sized it to flexo torsione)

 

[meccanicamg]

the value of k you always know the limits of materials. being that k is given by the admissible pressure product and speed.... you have it.

 

[danny1204]

the value of k you always know the limits of materials. being that k is given by the admissible pressure product and speed.... you have it.

But the speed is given by the omega radius, I always lack radius.

 

[meccanicamg]

But the speed is given by the omega radius, I always lack radius.

So put the story radius and do the reverse formula....

 

[danny1204]

So put the story radius and do the reverse formula....

what would be the ray story

 

[meccanicamg]

what would be the ray story

Sorry, the automatic concealer.

I said that you express the formula with the radius and put it in the explicit formula all according to the ray parameter, collect and pull out the value.