Jasper Engines and Transmissions has adopted a computer-controlled, single point machine generated concept in its cylinder head valve seat machining process.
This concept utilizes a Newen CNC (Computer Numerically Controlled) machine that is fitted with a single point cutting tool that generates a seat based on dimensional parameters that have been established, and saved to, a computer’s memory. These parameters give the tool a road map to follow when generating the seat.
“With this technology, the seat can be as simple or as complex as we would like,” said Chuck Lynch, Jasper quality control captain. “Additional angles, radii and widths, can be changed with a few simple programming adjustments. The machine has the capability of storing hundreds of profiles that are ready to go with just a couple of finger taps on the touch screen.”
Lynch added, “Timing is improved due to the fact that there are no additional cutters to buy and wait weeks for. No tools are wasted or pitched into a drawer, never be used again.”
Jasper has chosen to use CBN inserts. CBN (Cubic Boron Nitride) is a super alloy that is widely used in machining for milling, boring and turning. Choosing this insert, coupled with the technology of fixed turning, even the toughest and hardest materials can be machined to exacting tolerances with relative ease.
“With single point tooling, the tool pressure is so greatly reduced that the seat can be near perfectly round, which in turn means a perfect combustion seal,” said Lynch. “With proper clamping, and pilot selection, a seat can be generated without concern of chatter, ovality or inconsistent seat widths. Worn valve guides, burned valves, excessive seat recession and power loss could occur if the valve and seat do not properly mate.”
At Jasper, this technology was first used for generating seat profiles for the Nextel Cup engines. “The next logical target was the very close tolerance Asian engine segment, now we are picking other platforms that can be difficult to machine,” said Lynch. “As we continue to increase our performance and quality, so must our pursuit of technology increase.”
For additional information on products offered by Jasper Engines and Transmissions, visit www.jasperengines.com.
