Abstract: A device for centering a work piece with respect to a centerline of a tool includes a radially-stationary component rigidly secured with respect to the tool such that the radially-stationary component and the tool are concentric. A biasing mechanism is biased away from the radially-stationary component to apply substantially equally-distributed radial force at a periphery of the work piece to thereby center the work piece with respect to the tool. A method of broaching a work piece having an inner and an outer diameter includes machining the outer diameter and then applying circumferentially-distributed radial force to the inner diameter or the outer diameter to thereby center the work piece with respect to a broach tool. After the applying step, the method includes broaching the inner diameter of the work piece using the broach tool.

Abstract: A device for centering a work piece with respect to a centerline of a tool includes a radially-stationary component rigidly secured with respect to the tool such that the radially-stationary component and the tool are concentric. A biasing mechanism is biased away from the radially-stationary component to apply substantially equally-distributed radial force at a periphery of the work piece to thereby center the work piece with respect to the tool. A method of broaching a work piece having an inner and an outer diameter includes machining the outer diameter and then applying circumferentially-distributed radial force to the inner diameter or the outer diameter to thereby center the work piece with respect to a broach tool. After the applying step, the method includes broaching the inner diameter of the work piece using the broach tool.

Abstract: This invention is a fuel efficient, high torque power, offset piston engine. The basic invention is a 2-stroke 2-cylinder engine. A single idler gear provides ignition timing between a pair of out-of-phase power pistons as 1-way clutches transmit the power to the engine's power shaft. Displacing and replacing a special idler changes the engine between a 2 stroke and a 4 stroke. Power stroke overlap saves fuel. Deactivating pistons when not needed without load on the engine saves more fuel. Other benefits will be obvious upon perusing the disclosure.

Abstract: This is a high torque power, offset piston engine with a straight power shaft. It is interchangeable between a 2-stroke and a 4-stroke by easily repositioning an idler. Objects of this invention include: 1. easily interchanged between 2-stroke and 4-stroke; 2. instant peak torque at the beginning of the power stroke; 3. power stroke overlap; 4. piston always square in its cylinder reduces cylinder wear and bypass gases; 5. an efficient 1-way clutch transmits power to the power shaft; 6. the 1-way clutch overrun feature allows deactivating pairs of pistons without load on the shaft; 7. lightweight piston and rod due to compression forces only; 8. low cylinder expansion rate with a small bore, which allows more complete combustion of a small combustion charge resulting in high fuel efficiency; 9. reduced mass engine compared to a crank engine; 10. fewer main bearings due to shear force only on the power shaft.

Abstract: This is a high torque power, offset piston engine with a straight power shaft. It is interchangeable between a 2-stroke and a 4-stroke by easily repositioning an idler. Objects of this invention include: 1. easily interchanged between 2-stroke and 4-stroke; 2. instant peak torque at the beginning of the power stroke; 3. power stroke overlap; 4. piston always square in its cylinder reduces cylinder wear; 5. a rugged breakaway 1-way clutch that is easily disassembled and reassembled for repairs; 6. the 1-way clutch overrun feature allows deactivating pairs of pistons without load on the shaft; 7. lightweight piston and rod due to compression forces only; 8. low cylinder expansion rate with a small bore, which allows more complete combustion of a small combustion charge resulting in high fuel efficiency; 9. reduced mass engine compared to a crank engine.