calculation of calibrated screw

[al401]

being new, I send a warm greeting to all.
My problem lies with the resistance calculation of a calibrated screw with m6 thread. such screw will be stressed to cut and therefore it is implicit to consider such type of load in the sizing. In any case I would like to consider in the calculation also the tension contribution of the precarious to which the screw must be subjected to not loose.I have seen different dimensions of such components but only to cut and since such screw must support a brake caliper, and therefore subject and heat and vibration, I would like to consider the right precarious. on which clamping values can I testify?

 

[cacciatorino]

being new, I send a warm greeting to all.
My problem lies with the resistance calculation of a calibrated screw with m6 thread. such screw will be stressed to cut and therefore it is implicit to consider such type of load in the sizing. In any case I would like to consider in the calculation also the tension contribution of the precarious to which the screw must be subjected to not loose.I have seen different dimensions of such components but only to cut and since such screw must support a brake caliper, and therefore subject and heat and vibration, I would like to consider the right precarious. on which clamping values can I testify?

I'll see if I put something on the preload tomorrow. But is the brake caliper floating?

However, screws usually work for friction and not cutting. This is a calibrated screw, you should consider the stem rectified only as a reference plug, and not to apply cutting efforts (even because the stems of these screws are not heat treated).
This in practice means that the precarious force must generate an friction between the two parties in contact so that this friction must always be higher than the forces that will tend to slip the two parts one on the other.
for the torque, it is very difficult to give values, as dealing with the helid with the formulas of the tilted plane would also go well in theory, but then in practice a lot of the torque that applies to the screw is used to win friction on the thread and friction under the head, and therefore of the torque that you impart to the head of the screw, only one part translates into precarious of the screw. the problem is greatly reduced by lubricating the screw with oil before mounting it.

 

[al401]

I'll see if I put something on the preload tomorrow. But is the brake caliper floating?

However, screws usually work for friction and not cutting. This is a calibrated screw, you should consider the stem rectified only as a reference plug, and not to apply cutting efforts (even because the stems of these screws are not heat treated).
This in practice means that the precarious force must generate an friction between the two parties in contact so that this friction must always be higher than the forces that will tend to slip the two parts one on the other.
for the torque, it is very difficult to give values, as dealing with the helid with the formulas of the tilted plane would also go well in theory, but then in practice a lot of the torque that applies to the screw is used to win friction on the thread and friction under the head, and therefore of the torque that you impart to the head of the screw, only one part translates into precarious of the screw. the problem is greatly reduced by lubricating the screw with oil before mounting it.

for the working screws "ad friction" is generally considered a preload such as to generate a voltage of 0.8snervation.
clear that even there it is difficult to establish the exact couple so that the surfaces do not slip.
at this point should I do the sizing in both cases to be cautious?
for the record the clamp is fixed.