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Materials processing and testing
News Release from: Norse Precision Castings | Subject: Rigid polyurethane castings
Edited by the Engineeringtalk Editorial
Team on 06 September 2007
Machining centre handles rimless lenses
The processes at Norse Precision Castings have allowed prototype quantities of up to ten individual aluminium components to be made economically.
Alphamatic has released a machining centre for rimless lenses With computer numeric control, it is able to machine holes and slots down to as little as 1mm diameter in plastic lenses as thin as 1mm, with high accuracy, to provide new levels of reliability in rimless spectacles
This article was originally published on Engineeringtalk on 21 Jul 2000 at 8.00am (UK)
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Further it's more economic, machining both lenses in the same programmed operation.
One critical problem overcome by the unit is that of maintaining mounting holes perpendicular to the variably curved surfaces in the relatively soft materials.
The tilt cradle, which provides this fourth axis of alignment, uses aluminium components manufactured by Norse Precision Castings, a company which also works in rigid polyurethane.
Rigid polyurethane is used for the base platform, front moulding and main top cover, each with close tolerance interfaces and demanding shapes.
The processes at Norse Precision Castings have allowed prototype quantities of up to ten individual aluminium components to be made economically.
However once design is proven, the sand casting process will enable parts to be combined, providing further economies.
The sand cast process will still be economic in supplying production quantities.
The components for the outer enclosure are based on models similar to those used in sand casting which allows the designer the freedom of style without surrendering functionality or ergonomics.
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