Gallery of pictures
Piston pumps used in hydraulic flight control systems have clearances of 0.005 mm between moving parts, requiring ultra-precise bore size, roundness, straightness, etc. The photo shows piston pump bodies in a multi-spindle Sunnen honing machine equipped with air gaging stations between spindles. This machine can control bore size to within 0.00025 mm (0.000010 inch).
A landing gear housing is setup for honing in horizontal orientation. These parts can also be honed in the vertical position, sometimes considered preferable.
The crosshatch surface finish left in the bore by honing enhances oil retention to lubricate and seal sliding/mating parts such as pistons, plungers and shafts.
A gun barrel must withstand pressures up to 60,000 psi (4136 bars) during weapon discharge.
High precision honing of hydraulic valves
About the author:
Dennis Westhoff has been involved for nearly 15 years in development of honing solutions critical to the performance of a wide range of products, including fuel injectors, various types of pumps, valves, and connecting rods. He holds a bachelor's degree in mechanical engineering and currently serves as Business Development Manager for Sunnen Products Company. He can be reached at firstname.lastname@example.org
or 314.781.2110 ext 2218.
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