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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 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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5 Laser Tracker Warm-up Tips for Ideal Measurement Conditions

BuildIT Laser Tracker Measurement Angles

An Important Factor in Precise Measurements: Laser Tracker Warm-up Time

In aerospace, one of the most extensively used measurement instruments is the laser tracker. Laser trackers are very precise devices composed of extremely complex subcomponents such as interferometers and angular encoders. They are basically robots capable of following reflective targets. And, as with all robots, they are subject to specific sensitivities. One of the most crucial of these is their sensitivity to thermal effects.

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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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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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BuildIT benefits from F-35 program with job and opportunity creation

F-35

Montreal, QC – With Friday’s release of Canada’s major economic indicators showing a decrease in job creation, BuildIT Software & Solutions of Montreal, QC urged the Canadian Government to continue investment in the production of the F-35 Lightning II fighter jet.

“With the current rise in the unemployment rate, it is vital that we continue to focus on the programs that are generating new opportunities and creating employment, like the F-35 Lightning II.  The program gives Canada access to the development of skills and know how in leading edge technology, allowing us to compete more effectively on a global scale,” said Vito Marone, Director of Sales and Marketing at BuildIT.  “I urge Ottawa to continue production of the F-35 Lightning II to create jobs and keep people working.”

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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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Article Pick: Energising the supply chain by Mike Richardson

Check out Mike Richardson’s article over at Aerospace Manufacturing on Energising the supply chain for the F-35 JSF programme:

High expectations mean that the F-35 has much more to live up to than previous jet fighters. Mike Richardson hears how the Lockheed Martin JSF programme team and its incumbent supply chain are taking steps to ensure it will meet customer demand[…]

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Gulfstream Provides Top-Flight Quality with Build!IT Software

Gulfstream Fuselage Assembly

A transition to digital assembly

Like many aircraft manufacturers, Gulfstream had long used full scale master tool models to manually craft and build their business jets. However, as technology advanced there was a shift toward digital engineering and manufacturing, including automated assembly by robotic riveting machines. Having relied in the past on physical tools for the skin panel assemblies, Gulfstream did not have the digital models needed to produce a numerical control programming to drive the automated riveting system. In order to evolve to the new process, they would need to reverse engineer the legacy white masters, create precise 3D CAD models then insert these models into the engineering design system for automated assembly. The process benefited from a combination of portable measurement devices and Build!IT software.

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