![]() Rectangular Tolerance Zone Circular Tolerance Zone Less tolerance zone area More tolerance zone area Datum reference is optional Datum reference is a must The design intent is not clear The design intent is very clear More chances of error during the inspection Fewer chances of error during the inspection More part rejection Less part rejection Poor part quality Better part quality Higher part cost Lower part cost Conclusion: Tolerance Zone Because GD&T can save them a lot of money and product quality also gets improved. So now you have realized why industries adopt GD & T. More tolerance zone area= More flexibility to the manufacturer= Lower part cost= Lower product cost= More Profit So there is about 57% more tolerance zone area ( Hashed area) in the circular tolerance zone. So even with the same tolerance in both linear tolerancing and geometric tolerancing, we are getting more area in the circular tolerance zone. Here you see that the Area of the rectangular tolerance zone is 100 Square Inches whereas the Area of the circular tolerance zone is 156.95 Square Inches. In the below image we have shown the differences between the rectangular tolerance zone and the circular tolerance zone. Rectangular Tolerance Zone Vs Circular Tolerance Zone The only difference is that in the rectangular tolerance zone, we have taken the length and height value, and in the case of the circular tolerance zone, we have taken the diagonal value. So basically, for both rectangular and circular tolerance zone, we have taken the same tolerance value. If you take the rectangular tolerance zone and measure the diagonals, it will be 14.14 inches only. For a moment, you may feel that I have taken a larger dimension for the circular tolerance zone. Now you might be wondering how I derive the value 14.14. For example, if we take the same example as shown above and apply geometric tolerances, you will notice that it creates a circular tolerance zone having a diameter of 14.14 inches. Circular Tolerance ZoneĪ circular tolerance zone is available when you apply GD&T on any features. If you draw the tolerance zone, then it will be like a square box having dimensions 10X10 as shown in the below image. If you see the below example, the hole axis position is controlled by two-liner tolerance of 10.00 inches in the X and Y direction. The rectangular tolerance zone is only available in the traditional liner dimensioning and tolerancing method. Circular Tolerance Zone Rectangular tolerance zone.There are two types of tolerance zone available. The top surfaces can lie anywhere in this tolerance zone, and the part will be accepted. So the zone created by the dimensions 8 inches and 12 inches is called a tolerance zone. The tolerance zone is the area where the specified entity can lie even after the extreme deviation.įor example, a part has a height dimension of 10+/-2 inches so that the height can go up to 10+2=12 or 10-2=8 inches. Does the circular tolerance zone in GD&T adds more cost to the part? What is a tolerance zone?īefore we learn about how a tolerance zone gives benefits to manufacturers, we need to understand what basically tolerance zone is.How much more tolerance zone area we will get in the circular tolerance zone?.Frequently Asked Questions on Tolerance zone.Rectangular Tolerance Zone Vs Circular Tolerance Zone.Then explode all the previously created polylines to get our intersecting lines, we do that because PEDIT only creates 2D polylines and we need to work in 3D. We use PEDIT for multiple objects and enter a fuzzy very slightly more than the diameter of the circle and join all the lines together. We get drawings from one engineers office that doesn't use AutoCAD and each point in a survey is depicted by a dot in a small circle symbol and the lines joining the points starts and ends at the circles. If you enter a fuzz factor the lines will be joined if the difference in their end points vary by an amount up to the fuzz factor you entered. ![]() But because of the accuracy of the system if the endpoints have an extremely small difference in their coordinates (0.000000000001 for example) then they are considered not to be the same and are not joined together. When lines are joined together using PEDIT the end coordinates of each line are compared and if they are the same the lines are joined if they are not the same the lines are not joined. The fuzz factor is just a tolerance, a distance in the current drawing units.
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