GKS aids face shield development
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GKS Inspection Services product story
Edited by the Engineeringtalk editorial team
Feb 26, 2009
When 3M's Occupational Health and Environmental Safety division was tasked with developing a face shield for welders, it contacted GKS Inspection Services.
About halfway through the design and prototyping phase, 3M realised they needed to improve the aesthetics of the design and needed new CAD data to revise the model.
The traditional design trial-and-error method of altering the CAD model was too time consuming and expensive for the project's targeted release and budget.
'We decided to make a clay model of the shield to address aesthetic concerns,' said a product development specialist at 3M.
A clay model would increase the speed and accuracy with which changes could be implemented in the shield to bring the project back in line with the design intent.
3M sent a picture of the clay welding shield mock-up to laser scanning service bureau, GKS Inspection Services.
The idea was to scan the left half of the model, and from that, use the point cloud to guide the creation of the new surfaces in CAD and mirror them to the other side, thus saving scan time and insuring a balanced design.
Also, the 3M CAD engineer needed 3D curves created at some of the surface intersections and orientated to an origin at a specified location.
Laser scanning projects a line of laser light onto surfaces while cameras continuously triangulate the changing distance and profile of the laser line as it sweeps along, the problem of missing data on an irregularly shaped surface is eliminated.
The laser measures fine details and captures complex freeform geometry so that the object can be exactly replicated.
3M received the complete scan data and CAD model of the redesigned face shield in a few hours.
From there, the 3M designers could finalise the design in 3D CAD, which would be used directly to cut the moulds for the face shield.
'We definitely cut our time and costs with laser scanning,' said 3M.
The traditional trial-and-error method of CAD iterations is expensive and takes much more time.
The face shield redesign was required due to aesthetic considerations, so details were of utmost importance and 3D laser scan data is intrinsically very accurate and detailed.
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