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What is HDU

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Question: What is HDU.
Answer: HDU is an acronym for High Density Urethane foam. It is a rigid easily machined substance of isocynanidic formulation. It was originally made as a rigid form of insulation for refrigeration units and as flotation for
boat hulls and also as a core and stiffener in fiberglass and composite fabrication. It has since found a great application as a medium for sign fabrication. HDU is easily machined is strong and has a great resistance to weathering. Unlike wood which has a tendency to rot , check swell and have grain which is difficult to machine. HDU is very easy to shape and will take almost any finish it can be finished in automotive and aircraft paints for superior finish durability.

Question: What is the difference between a CNC machined sign and a hand carved sign.
Answer: A CNC machined sign is designed in a computer with CAD-CAM software and then machined with a CNC machine. CNC machine can deliver precise results very quickly and efficiently . Hand carved signs are as it is obvious hand carved, each sign is a one of a kind and takes a lot of time to make and finish. Consequently hand carved 3d signs are more expensive than cnc signs. Once a sign is designed on the computer it can be duplicated as many times as desired on a CNC machine with precise results. All vinyl cutout machines and vinyl printers as well as most engraving machines are CNC machines. 3d lettering as well as relief work on HDU as well as wood signs is more and more being done on CNC routers. CNC machines while being cost effective will never replace the human hand or the artist however and there will always be the requirement for hand work , carving and general artistry in signmaking.

 



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