What is the maximum load capacity for my fabricated bracket?

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SUMMARY

The discussion focuses on determining the maximum load capacity of a fabricated bracket intended to support approximately 1000kgs. Key considerations include the orientation and positioning of linear bearings, specifically the outer (RHS) and inner (LHS) bearings, to effectively distribute the load. Recommendations include using a 20 mm thick, 700 mm wide shelf and possibly mounting it on edge for better load support. The conversation emphasizes the importance of understanding the functionality and identifying the weakest link in the design to ensure safety and effectiveness.

PREREQUISITES
  • Understanding of load distribution principles in mechanical design
  • Familiarity with linear bearing types and their load capacities
  • Knowledge of structural integrity calculations for fabricated components
  • Experience with mechanical assembly and modification techniques
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  • Research load calculation formulas for fabricated brackets
  • Explore different types of linear bearings and their specifications
  • Learn about structural reinforcement techniques for load-bearing shelves
  • Investigate safety factors and failure modes in mechanical design
USEFUL FOR

Mechanical engineers, structural designers, and anyone involved in the fabrication and modification of load-bearing equipment will benefit from this discussion.

DJT1967
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Hi Guys I hope you can help. I’m currently trying to modify some existing equipment and have a problem that I hope you good people can help me solve. I have a fabricated bracket that currently supports another bracket than runs on linear bearings to position its self.

see attached JPG for rough layout.

We would like the existing bracket to support a load of approximately 1000kgs and after doing some research and found some calculations that would appear to be roughly what I need but I’m not sure.

I was wondering if anyone here would be so kind as to point me in the right direction as to what calculation / formula I would need to calculate the maximum load the bracket will take.

Thanks in advance for your help.
 

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I think it best to first understand the functionality, then look for the weakest link in the design.

The sliding bracket will rotate clockwise due to the eccentrically applied load. The outer (RHS) linear bearing will carry all the load, plus the negative load on the inner (LHS) linear bearing.

A 20 mm thick, 700 mm wide shelf supports the linear bearings. That shelf should be narrower so the outer (RHS) linear bearing that carries the load, can be closer to the vertical support structure.

If the purpose of the inner (LHS) linear bearing is to maintain the orientation of the sliding bracket, then consider mounting one linear bearing above the other so you can get both bearings to carry the load, and move the vertical force much closer to the vertical support structure.

You might consider mounting the shelf on edge as it will support the load better in that orientation.

What type of linear bearings are you considering? Make and model?
Can they take sideways or lifting forces as great as the vertical force?
 
Last edited:
DJT1967 said:
We would like the existing bracket to support a load of approximately 1000kgs
That's a pretty significant load. What would happen if the bracket fails? How far can the load fall, and what kinds of things are underneath this assembly?
 
Oh duh, never mind. The OP is from 2008. o0)
 

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