Brushed Stainless Steel Door Handles

A recent order prompted a return to the light box to see if we could photograph the luster of brushed rather than polished stainless steel. The lightbox had to be reconstructed to fit the 35” length of the Ergo Epic handle and even then, it was a very tight fit. The Ergo grip was photographed on a golden satin fabric using a Canon ESO Rebel with diffuse light created from overhead rows of LED light cells. The walls of the box are covered in a reflective foil to focus the light on the object and the floor and back wall are usually covered with a black or white backdrop.

How to Brush Stainless Steel

1.     Angle grinder with a blade attachment is used to cut off any gates left from the  casting stage.

2.     Angle grinder using a very coarse grit disk that removes any major surface imperfection. This sometimes will reveal a small crater or void caused by an air bubble that occurred during casting which will need to be filled with steel weld before going further.

3.     A handheld burnisher with an 80 grit sanding drum is next applied to begin buffing and refining the surface.

4.     A second burnisher machine is used with a dual grit scotch-brite sandpaper drum with successively finer grit drums.

5.     The final burnishing is done by hand with scotch-brite pads.

6.     Lastly the piece is passivated.

 Passivation

 316 Stainless steel is known for its rust resistance so what is oxidation and why is passivation necessary? 316 stainless steel is an alloy comprised of iron, chromium, nickel, molybdenum, and carbon. Chromium reacts to oxygen in the air and this oxidation process creates a protective layer on the surface of the stainless steel that acts as a barrier to corrosive forces like salt air. It is the iron component in metal that rusts and while 316 develops a protective coat, during the burnishing process contaminants can attach to the surface. Hence the final stage is to passivate the piece by immersing it  in a bath of citric acid solution which strips any iron contaminants from the surface and bonds with the iron elements to neutralize them and prevent future corrosion.

Flexibility a key component to door hardware design

The first edition of any piece that we make is rarely the final version, rather it evolves as new versions are developed to enhance the piece for  stylistic or practical reasons. At our design atelier there are many examples of this evolutionary process.

 Evolution of Grapevine -

The original Grapevine entry lever set is a popular handle set and still available in its original design but for home owners who have a narrow door stile of 4” a new version with a 3 ½” wide back-plate was developed.A new pattern was carved to make the leaf edges on the back plate smaller and more contained without compromising the original design.

Morphic Cylinders - a case study in progress

 The Morphic cylindrical door pull is currently specified as a 16”,26”or  32” long pull with a 2” diameter. We choose these lengths to offer a suitable range of grips for doors varying in height from a standard 80” to a large 96”+. For each size an original pattern of non-repeating lace was designed and carved resulting in 3 unique pieces. When a designer wanted to specify a different length, this could only be achieved by adding length to the non-lace ends.

 The new version in development retains the organic design but certain sections have been changed to create a repeat pattern which will enable customers to special order the Morphic pull in lengths ranging from 18” to a possible 60”length.

Post Oak Hotel

It was critical that the new pull retain the fluidity and natural appearance of the original pattern so considerable care was taken to create irregular repeat lines that do not truncate the design.