Lapping is a specialized bore finishing process for those applications with extremely tight tolerances. It goes beyond the core capabilities of even the most advanced honing process to deliver cylindricity within 0.000060” (0.0015 mm); straightness within 0.000040” (0.0010 mm); and roundness within 0.000015” (0.0004 mm).
How Automated Lapping Works
At one time, lapping was a labor-intensive, manual process with a high margin for error. Today, Sunnen is the exclusive provider of automated bore lapping solutions. Sunnen’s patented machine uses a tool known as a lap, which resembles a honing mandrel but with grooves instead of abrasive stones. As the lap enters the bore it spreads a loose abrasive compound between the tool and the wall of the bore. As the tool rotates and reciprocates within the bore the abrasive compound removes excess material and creates a uniform surface finish. The machine periodically gauges the size of the bore and continues the lapping process until the bore is within specifications…all without operator intervention.
Automated Lapping Is Used To:
Improve consistency of finished parts
Reduce reliance on human operators
Reduce potential for repetitive motion injuries associated with manual lapping
Improve workplace safety by eliminating manual processing
Tighten tolerances in bore diameter, roundness and straightness
Typical bore lapping applications include:
Piston pumps and other aerospace parts
Hydraulic valves and sleeves
Thin-walled parts that are prone to distortion when honing
In addition to our unique SVL-2115 machine, we offer a complete line of accessories to keep your lapping machine up and running for the long haul:
We’re On Your Team
We stand by our work and support our customers. Sunnen is the only company in our industry to provide a standard three-year warranty on every machine we make. We also offer machine installation, service and preventative maintenance to keep your operations running smoothly and address any emerging manufacturing challenges.