Tolerance Stack Up Analysis:
Find Your Tolerance Stack Path
Step 3 shows you how to set up and identify a tolerance stack. And more important - to spot if a design is ready for tolerance analysis - if there is a clear tolerance stack path or if it is ambigious.
See "Episode 3" of the "How to set up a tolerance stack"-series
How Would you Define the Tolerance Stack in this Example?
• When analyzing your mechanical design, it can be challenging to identify the correct path.
• The example - is by intent: simple and tricky. There is no clear path!
Unclear Paths = You Cannot Trust The Stack-Up Calculation
• In this example, there are two possible paths
• Using RD8's Pathfinder tool will display these two paths
• If one is calculated - there is a chance that the other will be the governing. You are not in control. The design is overconstrained and hence itis impossible to make a prober tolerance stack.
Which Tolerance Stack Path Should you Chose?
• This creates a risk of conflicting paths - sometimes one path controls, other times the second does.
• Such uncertainty adds no value to the product and can lead to design issues - and certianly adds to lost control and unpredictability.
How To Fix Your Tolerance Stack
• An the shown example - two different paths exist.
• This happens because the design is overconstrained.
• The RD8 X-ray feature helps to identify overconstraints.
Be careful! Overconstrained Designs are the Root Cause for Complexity
• A single overconstrained can cause confusing - and make it difficult to set up a tolerance stack.
• Just by a few overconstraints - design complexity increased dramatically - almost exponentially.
• Avoid overconstraints in order to have full control of your tolerance stack.
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