Is it static, or will it rotate, oscillate, be subjected to friction, or require load bearing? Is it part of a larger assembly? All these questions will help you define your dimensional tolerances. Consider your materials : Different materials offer unique chemical and mechanical properties, and will have different margins to consider. For example, plastics are more prone to changing in size, so dimensional tolerances for plastic injected parts will have to account for increased variation.
Consider your manufacturing procedures : Just like materials, distinct manufacturing methods and tools may require you to take unique measurement errors into account when creating tolerances. Rigid machinery can adjust to tighter tolerances, whereas the general tolerance for rubber parts must account for more variation due to shrinkage and expansion.
Conduct a costs-benefit analysis : Using the above information, find a balance between a too-tight and an overly-loose tolerance. Keep the manufacturing process simple, speedy, and cost-effective while ensuring every individual component is sized correctly. Account for tolerance slack and stacking : Tolerance slack is the total tolerance band of a product, combining the tolerance bands of each individual component.
Knowing your tolerance slack can help you avoid tolerance stacking — this is when too many small tolerance inaccuracies lead to larger errors and miscalculations. After completing these five steps, you can start defining those dimensional tolerances and fits. Rigid machinery — like that used in CNC machining — can adjust to tighter tolerances, whereas the general tolerance for rubber parts must account for more variation due to shrinkage and expansion.
Related Resources Article Why does 3D printing layer height matter? Article When to use 3D printing for injection mold tooling Article How additive manufacturing transforms the sporting goods industry. We store cookies on your computer to give you a better experience, both on this website and throughout other media. By using this website, you consent to the cookies we use and our Privacy Policy.
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We are problem solvers here at Axenics, and that means we run into some pretty complicated challenges on a daily basis. Some projects we take on are exceptionally complex and, therefore, more difficult to design and engineer than others. Others seem simple and then Blog Contact Us. Recent Posts.
Plastic pipe welding and tube bending are a perfect fit. Estimated Reading Time: 3 minutes. Our process is simple: Developing the Concept: You should be involved in every stage of production. We will meet as many times as necessary to get your concept on the correct path. For example, if parts need to be flush to one another with no obvious gap, you will need to define tight tolerances for both parts.
They are cost-effective — Generally speaking, the tighter the tolerance, the more it will cost to manufacture. So by defining your tolerances, you will not pay for extreme precision when looser tolerances are acceptable. And for parts that require tight tolerances, you assure the tolerances are achieved the first time, avoiding costly delays.
We guarantee our parts will deliver for you. Request a Quote. Keep in touch Want to learn more? Depending on your application, you might want a clearance fit to allow for expansion due to heat, a sliding fit for better positioning, or an interference press fit for holding capability.
Be careful when applying tolerances to radius or diameter dimensions. A tolerance on a radius will be doubled when measured as a diameter. A tolerance on a radius might be looser than intended, while one on a diameter might be tighter than intended. That would be considered a nonconformance. Take into account whether any plating or finishing processes a part requires. Also take note if the dimensions apply before or after these processes.
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