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Aluminium can be turned in standard, special and automatic lathes and should be carried out at high speeds of rotation. Parts to be turned should therefore be fitted securely to avoid vibration. Spacers between the part and the mounting prevent marks on the metal and deformation.
Aluminium’s high coefficient of thermal conductivity is not so desirable in applications where low heat transfer is wanted such as in windows. There are many ways of insulating.Hardware aluminum anodize product Supplier
Two techniques that greatly reduce the ability to conduct are commonly used. In the first the extrusion is pressed in one piece and a closed space in the extrusion is filled with polyurethane. When the polyurethane has set, the extrusion is divided into two parts held together by the polyurethane. In this way the thermal bridge is interrupted (fill and mill).
In the other method two extrusions are joined using polypropylene or polyamide strips. These are rolled into position. This way of insulating makes it possible to use different colours on the inside and outside of the window.