In lapping and polishing, hard and brittle workpieces  are prone to damage such as scratches and cracks.

Situation is worsened by the constant vibration of the drive. We have developed hydrodynamic plain bearing to segregate the trasmission of this vibration.

As shown in the diagram, the lower plate support (a) is separated from the bottom part(b) of hydrodynamic plain bearig (c).  As (a) rotates, dynamic pressure is developed and causes (a) to rise.  The fluid film thus cuts off the vibration.  

The Hamai patented hydrodynamic plain bearing is maintenance-free and has a semi permanent life ensuring improved processing accuracy and efficiency.

The lapping plates of lapping machines using epicycle gear suffers from degrading flatness as process time progresses. the main reason for this is the carrier's constant uni-directional rotation.

On our machines, the carrier alternatively rotates clockwise and counter-clockwise during lapping.. This maintains constant table flatness hence the lapping accuracy. (This is a standard equipment in machines with 2-motor, or above drives)

The models with 3-motor or more can control the carrier rotation and revolution speeds, This enables the parameters for rotation and revolution to be set according to the workpieces.

As the upper table of the 4-way system rotates, it results in unsatisfactory behavior and poor load tracking during lapping/polishing operation.

The 3-way system has achieved the satisfactory load tracking and uniform load, the inherent attributes of upper table, by making it non-rotating.

Further, the wire-suspension system used as the flexible link mechanism that slides in parallel with the lower table allows no deviation in the load distribution in a batch.

Also, the suspension wires absorbs the micro vibration, enabling constant lapping/polishing of workpieces in a natural stress-free state.

Single-sided lapping/polishing machine, evolving from double-sided lapping machine technology, adopts the radial direction hydrodynamic plain bearing also for the thrust direction to achieve near ideal rotation of the plate.

Improved runout and decreased vibration, and higher loading capacity of the lower plate.

"Dry hobbing" refers to gear hobbing without any use of cutting oil. The machine can run with the hob circumferential speed of 300 - 500 mm/min. using a carbide hob cutter.

The merits of dry cutting are increased productivity due to high-speed cutting, simplified process by hobbing hardened workpieces, reduced cost due to no cutting oil being used, improved work environment, etc... Dry cutting drastically reduces your production costs.

N60 is capable of dry hobbing at up to 5,000 min-1, 5 - 7 times the conventional machines. The machine, when equipped with a spindle-cooling device, is a high stiffness, high precision hobbing machine assuring exceptionally stable hobbing accuracy.

All the gears built in the machines are of the highest quality, ground on the Klingelnberg or Reishauer gear grinding machines.

The main compnents such as the hob spindle are ground and lapped, and mounted on the machines carefully, so that the machines can produce high accuracy gears.

The machine can hob hard-to-grind small gears to high accuracy by cutting  only.

Hamai proudly presents this bridge-type clamper; it is highly rigid and asuures stable operation even under heavy duty cutting from both sides thanks to its sturdy clamping power by utilizing oil cylinder.

Clamping and unclamping worlpieces is accomplished by opration of the switch. The table surface can be freed for safe and quick change of workpieces.

The machine's dedicated, interactive software allows the operator to perform his work simply by merely inputting, interactively, basic input such as workpiece dimensions, cutting speeds etc., without having to consider any NC programing.

Safe and secure machining has become possible by installing a device to prevent collision due to entering wrong-data.