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Latest update: 25/06/2021 18:17:38

Yamamoto engineering Co.,Ltd.

Leave it to us for precision machine tool overhauls, modifications, repairs, and retrofitting

We have been asked to perform highly accurate restorations and have the capabilities to implement a series of rationalization processes such as automatization, work force reduction, and efficiency improvement. Craftspeople who are familiar with machines take advantage of the machines' characteristics, use the flood of products released to the market as tools, and finish machines that match the intended use of the customer as if they were made by hand. We believe that these methods are the best for customers and us. 

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[Introduction of overhauled equipment]
KAPP VIG: Changing NC equipment and peripheral devices to made-in-Japan products has brought about stability comparable to that of a brand-new product
Measuring the amount of axial displacement and eliminating a centering process
Conventionally, skilled workers performed a centering process. However, numerically controlling the Z axis enabled processing at an off-center position, with the center of the work serving as the reference position. Thus, a centering process was eliminated. Accurately measuring the amount of axial displacement reduced it to 50μ per diameter-200 grooves, and concentricity and pitch errors were in the range of around 5μ at 50 points.  

Restoring the high accuracy that the original machine used to have
All sliding surfaces including V-V low-friction sliding surfaces are finished like new equipment. Various main parts are replaced by made-in-Japan parts.

Upgrading the filtering mechanism 
The conventional filtering mechanism was upgraded to a more powerful one, so no grinding powder is found in the equipment.
GLEASON #120 carbic coupling grinding machine
Two-axis front/rear–left/right numerical control and a newly designed and produced dress unit incorporating a rotary diamond
Tooth contact can be adjusted just by changing data on the screen. The incorporation of the rotary diamond enables the grinding wheel shape to be maintained for a long period. In addition, a servo motor is used for the rotation of the diamond to automatically control its rotation speed depending on the grinding wheel diameter and the tip speed ratio. Work-specific data is stored to drastically reduce tool set-up time. For example, the grinding wheel shape is easily reproduced.  

Numerically controlled slide base
The equipment was modified to use ball screws as well as a servo motor, to install a linear motion guide, and to adopt scale feedback control. The modification enables highly accurate positioning and repetition.

Feed cam mechanism eliminated, and the grinding wheel feeding part directly driven by trapezoidal screws and a servo motor
Processing conditions (such as grinding depth and feeding speed) can be freely set. The operator can freely set the amount of grinding wheel feeding during dressing in units of 1 μm. 

Numerically controlled work indexes and rough calculation
The use of an index plate made by GLEASON ensures that the calculation accuracy is nearly the same as the conventional level. The indexing forwarding amount does not require adjustment. Plates with a number of teeth that are evenly divided can easily be shared. 

Numerically controlled root angles and horizontal settings
For root angles, pushing the button once enables transition to the processing position or the work setting/removal position. In addition, the turning function after the completion of automatic operation can be selected. The grinding wheel position is automatically selected as needed. For horizontal settings, newly introduced numerical control and hydraulic clamping allow for tool set-up without the need of any tool.

Use of a spindle motor for the rotation of the grinding wheel
Simply inputting data enables individual setting of rough processing, finishing, and the rotation speed of the grinding wheel during dressing.
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