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

Wind Turbine Flange GD&T

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.

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GD&T in Aerospace Assembly: Use of Multiple Datum Targets for N-2-1 Location of Fuselage

Datum Based Alignment of Fuselage

This post will present a possible case in the aerospace industry for locating a fuselage part with 9-2-1 location, using datum target areas. For more detailed information on datum targets, you may refer to the ASME standard, section 4.24 [1].

N-2-1 Location with Datum Target Areas

In a previous post, we talked about using 3-2-1 precision location to create an accurate and repeatable datum reference frame for the part, while avoiding overconstraint. However, for most sheet metal manufacturing processes, the main dimensional problem is the sheet metal deformation normal to the surface [2]. This deformation cannot be neglected, even under the self-weight of the workpiece. Analysis shows that the average deflection of a sheet steel plate 400 mm x 400 mm x 1 mm under its self-weight can be between 1-3 mm with a 3-2-1 location layout. Therefore, an adequate fixturing system for sheet metal usually requires N>3 locators on the primary datum to properly restrain workpiece deformation.

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

NX Flange Full

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.

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GD&T in Automotive Assembly: Surface Profile Tolerances

Car Door Surface Profile Tolerances

In a previous post, we presented an application of datum targets for 3-2-1 location of a car door. In this post, we will follow up with the same part to verify the surface profile tolerances along the side surfaces of the door, for optimal assembly conditions.

Surface Profile Tolerances

A surface profile tolerance zone is a three-dimensional volume establishing permissible boundaries of feature(s) of a part. A surface profile tolerance can be used to define a tolerance zone to control combinations of size, form, orientation and location of a feature relative to true profile.  For additional information about profile tolerances, please refer to the section 8 of the ASME Y14.5-2009 standard [1]. In Figure 1, we can observe the car door part located through datum targets with surface profile tolerances. In the next sections, we shall analyze these tolerances further to better understand their functions.

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

Diamond Pin Assembly GD&T

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.

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

GD&T Pin and Slot DRF

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.

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Siemens Digital Manufacturing Symposium 2014

Siemens Digital Manufacturing

BuildIT is proud to be a sponsor of this year’s Siemens PLM Software Digital Manufacturing Symposium, which will be held on Oct 21, 2014 aboard the RMS Queen Mary in Long Beach, California.  You can register for free to attend this year’s event.

This event provides an excellent opportunity to hear and learn from leaders in the manufacturing world as they discuss digital manufacturing trends, strategies and successes within their own organizations. As with past events, these powerful discussions are backed by Siemens staff, as they demonstrate some of the key capabilities found within the Siemens PLM Software digital manufacturing solution set.

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BuildIT Software & Solutions Ltd. to Offer Siemens PLM Software’s NX CMM and DPV

NX CMM Banner

Montreal, QC, September 2014 – BuildIT Software announced today that it will now offer solutions from Siemens PLM Software: NX CMM—a programming, inspection and analysis solution for Coordinate-Measuring Machines (CMMs)—and Dimensional Planning & Validation (DPV)—a solution for Statistical Process Control (SPC) from the Tecnomatix® portfolio, the industry-leading digital manufacturing software.

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Does a Competition for a New Fighter Really Make Sense?

CJIG F35 brochure
A Canadian Industry Perspective

“There has been a great deal of inaccurate information and rhetoric in the news recently about the benefits of a competition for a new fighter aircraft to replace Canada’s aging, and ever-increasingly more expensive to maintain and operate, fleet of CF-18’s. We believe it’s time that Canadian industry – in this case the Canadian JSF Industry Group – weighed in on this topic.

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TRENDS IN AEROSPACE ASSEMBLY: MEASUREMENT ASSISTED ASSEMBLY- MEASUREMENT DEVICES PROVIDING GUIDANCE FOR ASSEMBLY

Final Assembly of Airbus 400M

In my last blog post, I talked about measurement assisted assembly (MAA). Measurement Assisted Assembly is a key operation for the reduction of time in aerospace assembly, which can account for as much as 40% of aircraft manufacturing costs. In this post I will present an interesting example of MAA: Assembly of aircraft through the guidance of measurement devices.

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TRENDS IN AEROSPACE ASSEMBLY: INTRODUCTION

Boeing 787 Dreamliner

Aerospace assembly is the finest jewel among assembly applications. It presents a daunting and unique challenge: The assembly of very large structures to very close tolerances along with huge fastening and drilling operations.

Assembly can take up to as much as 40% of the total cost of manufacturing an airframe due to the labour and quality issues because of drilling thousands of holes per aircraft. Around 5% of the total manufacturing cost of an aircraft or 10% of the airframe cost is caused by the use of fixed tooling.

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Join us at AeroDef – a pre-show overview

AeroDef Manufacturing Conference 2013

For those involved in Aerospace and Defense manufacturing, there will be an exciting conference March 19-21st in Long Beach California.  The 2nd AeroDef Manufacturing conference produced by the Society of Manufacturing Engineers (SME) has an executive committee sourced from some of the biggest names in the industry including Lockheed Martin, Northrop Grumman, EADS and Boeing.  Keynotes will be delivered by:

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