Entrées par Onat Ekinci

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GD&T in Wind Power: Maximum Material Condition and Maximum Material Boundary Effects on a Wind Turbine Tower Flange

In a previous post, we presented an application of geometric dimensioning and tolerancing with a wind turbine flange. In this text we will continue further, analyzing the same part with simulated points. Our objective is to observe the effects of different material modifiers on the analysis results and their advantages. For this, we will simulate measurement points on the part and then perform a GD&T analysis in BuildIT. We will then compare how the results obtained are affected by the application of different modifiers. Read More Read More

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GD&T in Wind Power: Position Tolerances in Wind Turbine Tower Flanges

Recently, utility-scale wind turbines have become so large and heavy that they are manufactured and assembled in sections. While a wind turbine tower can reach a height of up to 100 m, there is a limit of 4.3 m on the diameter to pass under bridges. For easier handling and transportation, a wind turbine tower is typically manufactured in multiple sections. Read More Read More

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GD&T in Precision Engineering: Use of Diamond Pins in Precision Location Applications

In a previous post, we elaborated on the principles of precision location and presented one of the techniques for achieving it: The use of slots. However, with slots, we can still have the problem of high manufacturing cost if the part has substantial thickness.  This is because manufacturing a slot is simply more complex than drilling a hole, in relatively thick parts. One technique to have the best of both worlds is to use diamond pins. Read More Read More

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GD&T in Automotive Assembly: Use of Datum Targets for Precision Location of Large Surfaces

In manufacturing and assembly, parts must be accurately and repeatably located in a well-defined reference frame to ensure consistent quality. For many automotive parts, because of the large and irregular surfaces involved, the entire surface of the feature cannot be used as a datum. In these cases, we use datum targets to establish a datum reference frame. This post will present a possible case in the automotive industry for locating a car door with the 3-2-1 location method, using datum target areas. For more detailed information on datum targets, you may refer to the ASME standard, section 4.24 [1]. Read More Read More

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GD&T in Precision Engineering : Use of Slots in Precision Location Applications

Precision location can be very important in various engineering applications, such as machining and assembly. In machining, the tool follows a very precise path and a workpiece must be located precisely and stably at a precise position. In assembly, the positions of assembled parts must be assembled easily and overconstraint of the parts must be avoided. One of the common techniques for accomplishing these targets is the use of slots as part features. Read More Read More


Comparison of tolerances used for coaxiality control: Position, Concentricity, Circular Runout and Total Runout

Coaxiality conditions can be vital for shafts supporting heavy and varying loads, such as car and truck axles, electric motors, generators and pumps. There are four different types of tolerances for defining coaxiality controls: Position, concentricity, circular runout and total runout. This post proposes brief and practical definitions regarding which type of tolerance to choose for certain applications as well as the advantages and disadvantages to each. For more information, refer to the ASME standard [1] and other related reference articles [2]. Read More Read More

Photogrammetry in Cultural Heritage: Experiments with a Cloud Based Service and an iPad


Can we document cultural heritage monuments with affordable tablets / smartphones and cloud-based photogrammetry services such as Autodesk Recap 360?  And how can the performance of these systems reach the accuracy and resolution levels of established devices?  What is the procedure for obtaining a 3D model of a monument by photos?  This blog post will try to present some of  the potential answers to these questions. Read More Read More