Simulation – Post mortem or part of the design process.

Simulation – Post mortem or part of the design process.

More often than not I receive requests to do a FEA analysis of a design that has failed or is in risk of failure. FEA has for to long been used as an after thought instead of actually part of the design process. This “post mortem” way of approaching simulation is highly inefficient. The time and money spent in the design-analyze-redesign process could be better used. For example, if during the course of the design a part or assembly is at possible risk of failure, those CAD files could be sent out for evaluation while the rest of the design work continues. Since most 3D CAD programs have associative capabilities with their respective 2D drawings, it only makes sense to bring in FEA concurrently.
Where companies that don’t have an analyst on staff, this may seem like an impossibility. But, with better, faster high speed internet connections, it is now worth a serious look.

One last point. FEA simulation doesn’t mean “we don’t have to test it”. There’s an old adage that says, “a single test is worth a thousand expert opinions”. So, think of it this way, simulation will limit the number of tests. 🙂

Thousands of this part were made only to find out it would fail soon after it was in use.

FEA SIMULATION

Custom Manufacturing Machines

Custom Manufacturing Machines - Replacing old shop machinery

So we begin with the existing equipment (shown below).

Issues:

  • Dangerous open wiring
  • Zero guarding
  • No e-stops
  • Unstable framing (it sits on saw a pair horses for Pete's sake!)

After meetings with the client and production personnel, we come up with a design in SolidWorks.  We added guarding, e-stops, enclosed wiring, temperature controller, and speed controls.  Nice...

 

Here we show the build up of the framing and other hard points.

 

Final assembly and testing begins.

Elting Mechanical Enterprises strives to give our clients what they need while showing them the benefits of our machine design experience and how it can open up other ways thinking about how they do business.

We like to work with manufacturing companies that have proud histories of domestic, in-house manufacturing.  Our goal is to make sure it says that way.

 

Part Descriptions

Many years ago while I was working for Calgon Carbon, the company was in the process of integrating databases from the other subsidiaries that they had acquired, into one unified ERP (Enterprise Resource Planning) system.

As a Design Engineer, my main concern was finding part numbers for existing components or creating new ones as well as developing Bills of Materials.  Since IT just dumped in all the different part numbers from all the different subsidiaries, little thought was given all the hundreds of parts that were duplicates.  What was clear was that the different subsidiaries had different philosophies on what the descriptions should be.  For example, a 1/4-20 hex head screw that's 1.25" long made of 304 stainless steel could have descriptions like:

  • SCREW, 1/4"-20 x 1-1/4", HEX HD, 304 ST
  • 1/4"-20 x 1-1/4" LG, HEX HEAD, 304 SS
  • HHCS, 1/4-20 x 1-1/4, 304
  • BOLT, .25-20 x 1.25 LG, HEX HD, 304 STAINLESS

And so on.  As you can see the permutations could seem to be nearly endless.  Of course, the other issue is that when a company allows multiple people to add and edit part descriptions in the company ERP system. Management thinks everyone should "work together" however, we know how it really works.