Tolerance is the acceptable range for a dimension, which is determined by the designer based on the form, fit, and function of a part. It is important to keep in mind that a tighter tolerance can result in additional cost due to increased scrap, additional fixturing, and/or special measurement tools.
Longer cycle times can also add to the cost if the machine needs to slow down to hold tighter tolerances. Depending on the tolerance call out and the geometry associated with it, costs can be more than double of what it would be to hold the standard tolerance. Tighter tolerances should only be used when it is necessary to meet the design criteria for the part.
Furthermore, overall geometric tolerances can be applied to the drawing for the part. Based on the geometric tolerance and type of tolerance applied, cost may rise due to increased inspection times.
The best way to apply tolerances is to only apply tight and/or geometric tolerances to critical areas, which will help minimize costs.
Unless specifically called out by the designer, the standard tolerance used by Xometry is ±.005 in. for metal parts and ±.010 in. for plastic parts. If tighter tolerances (less than the standard, e.g. ±.002 in.) are required, the information must be communicated as to which dimensions require a more narrow range. As a point of reference, a piece of paper is about 0.003 in. thick.
These are the reasons for the production tolerance and the influence of the product tolerance. If you want to know more about this, you can visit our website. We will provide you with the latest content you are interested in.
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