couple clamping screw on aluminum and blind hole

[malpom]

good morning to all I am to calculate the torque for screws m8 and m10 that block blades on an aluminum pulley.

I estimated the cutting force with which I returned to function of contact surfaces a pressure, and consequently, wanting to make work the screw only traction I would like to calculate the pair on a series of screws...

the question is how I estimate the contact data between galvanized steel screw and pulleys, of course I imagine that there should be a minimum contact surface of socket..., also the minimum resistance data would take the lowest ones of aluminum. . Do you have any data or advice?

 

[Marco F inox]

good morning to all I am to calculate the torque for screws m8 and m10 that block blades on an aluminum pulley.

I estimated the cutting force with which I returned to function of contact surfaces a pressure, and consequently, wanting to make work the screw only traction I would like to calculate the pair on a series of screws...

the question is how I estimate the contact data between galvanized steel screw and pulleys, of course I imagine that there should be a minimum contact surface of socket..., also the minimum resistance data would take the lowest ones of aluminum. . Do you have any data or advice?

you should specify that the blades rest on the cylindrical part of the pulley, longitudinally.
in this case it is unthinkable to make a mounting without a superfluous support plan.
with screws of m8 and m10 you will have a contact surface at least 18 and 22mm wide. otherwise you will have on the screw, a stinging component beyond that of traction.
keep in mind that these screws act on a thread length of no more than 10 and 12 mm

 

[malpom]

the pulley is a ø70 I have a knife 60mm wide that the anchor with 2 screws m10, a disk instead I pulleys ø90 and 6 screws from m8 screwed for about 25mm the pulley is an aluminum alloy with copper for friction resistance.

 

[Marco F inox]

instead of simplifying and clarifying better, you understand even more things.
Why don't you have two drawings with quotas?
Maybe you're building a sniper?

 

[meccanicamg]

good morning to all I am to calculate the torque for screws m8 and m10 that block blades on an aluminum pulley.

I estimated the cutting force with which I returned to function of contact surfaces a pressure, and consequently, wanting to make work the screw only traction I would like to calculate the pair on a series of screws...

the question is how I estimate the contact data between galvanized steel screw and pulleys, of course I imagine that there should be a minimum contact surface of socket..., also the minimum resistance data would take the lowest ones of aluminum. . Do you have any data or advice?

the subject has already been dealt with for example qui, even better qui, and exactly the same qui.

the bulkonato coupling is calculated according to uni en iso 1993-1-8 already treated many times on the forum.
if you use a friction mating you have not only to evaluate the traction on the screw.

The debate can be This is what with the formulas of the post #11 that I bring back below.
the coefficient of friction you are obliged to estimate it, otherwise you have to make a tilted plane with the materials that you will use ....and the angle to which the block begins to descend, will determine the coefficient of friction. We've talked about it several times.