Determining Minimum Bolt Size for Display Mounting

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Discussion Overview

The discussion revolves around determining the minimum bolt size required for mounting a display weighing 6 kg. Participants explore the mechanics involved, including the forces acting on the bolts and the appropriate calculations needed to ensure structural integrity. The context includes aspects of mechanical engineering and material selection.

Discussion Character

  • Homework-related
  • Technical explanation
  • Mathematical reasoning

Main Points Raised

  • One participant presents a scenario involving a 6 kg display supported by hollow square sections and seeks to determine the minimum screw size needed.
  • Another participant requests clarification through a drawing to understand the loading conditions on the screws, questioning whether they are in tension, compression, or shear.
  • A participant suggests that the bolts would experience shear stress and outlines a method to calculate the force per bolt by dividing the total weight force by the number of bolts.
  • The same participant proposes using the maximum shear stress of the bolt material to calculate the required diameter, indicating that the resulting diameter may not correspond to a standard size.

Areas of Agreement / Disagreement

Participants have not reached a consensus on the specifics of the loading conditions or the calculations required, indicating that multiple views and uncertainties remain in the discussion.

Contextual Notes

There are limitations regarding the assumptions made about the loading conditions and the need for a drawing to clarify the forces acting on the bolts. The discussion also lacks resolution on the specific stress formula to be used for the calculations.

sekedarimaji
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Homework Statement


Hello guys, I want to make a mounting for a display which 6 Kg weight. The display will be supported by two hollow square 30x30 with 2 mm thickness and bolted by 2 socket screw in each hollow. Base of the display are made from aluminium sheet 1 mm thick.

Homework Equations


What is the minimum screw size should use?

The Attempt at a Solution


the closest way is get the section area of the screw from a stress formula, but I'm not sure which stress formula
 
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Can you do a drawing? It's not clear if the screws are in tension, compression or shear.
 
Is there any way to edit my previous post? I've tried to find edit button but i couldn't find it.

CWatters said:
Can you do a drawing? It's not clear if the screws are in tension, compression or shear.

Display.jpg


Bolt.jpg
 
The bolts in your diagram would experience shear stress. First you could calculate the weight force of the display by using mass x gravity. Then since you have 4 bolts divide your weight force by 4 to get the force per bolt.

Once you have that you need to pick the material of your bolts and look up the max shear stress allowed for that material. Once that is known you can use the equation stress = force / area. Use max shear stress in place of stress and force per bolt in place of force and write area as PI*D^2/4Then you can solve for D. It will most likely not be a standard bolt diameter, just pick the next largest size.
 
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