A few nice high precision machining images I found:
Image by Sunova Surfboards
Teddy Navarro doing a big air on his Sunova – full balsa surfboard – the original parabolic rail, by Bert Burger.
The Full Balsa Surfboard – for Maximum Twang
Balsa has the highest rate of flex return of any material used in lightweight composite technology.
When applied as a skin to the Sunova precision machined shapes, this sweet natural material also gives you the highest performance option.
As with a Springer, the Sunova full balsa surfboard adds another dimension of spring to a sandwich board:- an unrivalled degree of sensitivity and spring from any part of the board.
Sunova’s individual balsa patterns and grain mean no two timber-skinned boards will look the same.
However, after working with balsa for so long we have arrived at the weight, density and grain structure that give the magic formula, board for board.
Strength and long term durability in your surfboard, are also at their greatest with The Sunova Full Balsa.
This photograph represents an inspection of angles on the escape wheel. The machine is a high precision toolmaker’s microscope, 1936
Image by The U.S. National Archives
Original Caption: Lancaster, Pennsylvania – Hamilton Watch. Operation – inspection – this photograph represents an inspection of angles on the escape wheel. The machine is a high precision toolmaker’s microscope – direct reading on this machine, accurate to .0001 of an inch, skilled inspection job, 1936
U.S. National Archives’ Local Identifier: 69-RP-150
Photographer: Hine, Lewis
The New Deal
Tennessee Valley Authority
Works Progress Administration
The Great Depression
Persistent URL: research.archives.gov/description/518434
Repository: Still Picture Records Section, Special Media Archives Services Division (NWCS-S), National Archives at College Park, 8601 Adelphi Road, College Park, MD, 20740-6001.
For information about ordering reproductions of photographs held by the Still Picture Unit, visit: www.archives.gov/research/order/still-pictures.html
Reproductions may be ordered via an independent vendor. NARA maintains a list of vendors at www.archives.gov/research/order/vendors-photos-maps-dc.html
Access Restrictions: Unrestricted
Use Restrictions: Unrestricted