Data Checks

Data Checks

As we have progressed from the days of paper drawings to the use of a single data set that holds the design information and is used directly for manufacture, so our reliance on the accuracy of this information has also increased.

The number of checks that used to exist in the progression to manufacture has decreased, whilst the consequences of the data being wrong have increased, compounded by the expectation of ever shorter timescales.

The old adage of “garbage in garbage out” still holds true, we can just do it faster!

At Plunkett Associates we have qualified, experienced Design Engineers who are experts in their role and who are 'old hands' at checking, double checking and triple checking data for just this purpose. We work alongside you using our knowledge and expertise to be able to adapt as necessary until we reach a solution that works best for your requrements. Feel assured we have been there, seen it and seen it again! 

Colour checksA classic example of where things can go wrong is in the production of threads. Frequently threads are not fully modeled; the CAD data will only hold the tapping diameter, relying on the drawing to call out the correct thread size. The component is machined to the CAD data, and then disaster, when the thread is to be cut the discrepancy is identified.

So to be positive, what can we do to minimise the risks? The answer is simple, we just have to check, but the least we can do is identify where problems frequently occur:

-       As already mentioned, check the tapping diameters against the thread call outs.

-       On blind holes with threads, is the hole depth adequate to give the necessary full thread form and allow for the tap run-out (also on male threads approaching a shoulder)?

-       If threaded inserts are to be fitted, is there sufficient wall section for the material chosen?

-       If parts are being cnc machined then can the fillet radii be achieved at the required depths and if not  will the parts interfere?

Data checking-       Are any critical tolerances called out on supportive drawings and are these achievable with the manufacturing process?

-       Have parts been modeled to mid tolerance?

-       Have fits been called out on critical mating features?

-       Will the parts assemble on adverse tolerances?

-       Has the data read in correctly, is the model “water tight”?

-       If it is a Solidworks native file are there any suppressed features and is this correct?

-       If the part is to be moulded, are the wall sections consistent and thick sections addressed?

The list could go on forever! Sometimes additional information such as colour and texture are also useful as these can influence the direction and available options.

If you would like us to assist you with your data as part of your project, please don't hesitate, the earlier we can be involved the more we can add value to your project through comprehensive data optimisation. To talk to us please ring or contact us here.