Mumford & Wood has used sophisticated computer technology to reproduce complex arched and curved sash windows fitted throughout a large restored Georgian estate in Hertfordshire.

The company also supplied French doorsets and entrance doors for the estate, which comprises a grand house and outbuildings that span different periods.

A bespoke CAD/CAM package generates the original processes to produce each curved part. “This is important as we strive to create the same standard of finish on the curved on plan products as we do on our standard flat product which is done by achieving straight grain on all faces,” said Dave Snowling, operations director. “In essence, we have to create 10 curved parts for a non-bar sash window regardless of height or width.”

Many CAD programs are required to turn each curved blank into a finished component and a computer-generated simulation is a double check, fail-safe precaution.

“There was a time when the part produced was as good as the craftsman who drew the rod,” Mr Snowling added, “but we wouldn’t take that risk. With our hi-tech machinery, we are 100% accurate first time and we are certain that each part produced thereafter will be exactly the same.”