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Frequently asked questions about products

Standard chuck

What are the components of the power chucks.

Please refer to here

B-200 series(PDF) N series(PDF)

Which machine manufacture’s turning centre will Kitagawa standard taper chuck adaptor fit to?

Please refer to the Kitagawa standard taper (0 taper) and the adaptive maker table below. If you need adapters for machine manufacturers not on the table, please contact your local dealer.

チャックアダプター

I'd like to change the draw nut. Are there instructions?

Please refer to the instruction manual. The following is an excerpt from the instruction manual.

取扱説明書

Is there a material that shows the type and shape of the grease nipple?

Please refer to the grease nipple page of the chuck catalogue. If you are looking for a nozzle for a grease gun, please refer to the answer to the next question.

I want to put grease in the chuck, which grease gun should I use?

Since the grease nipple used in our chuck conforms to JIS standard head part φ6.6 mm, please contact your local dealer.
The counter bore diameters vary depending on chuck models. (φ12, φ14, φ15, φ17, φ20, φ24) For detailed dimensions please check our catalogue at the following address.
http://prod.kiw.co.jp/mtools/relation/item/69_Grease%20Nipple.pdf
Please select the suitable nozzle from the following catalogue of Yamada Corporation.

グリスニップル

I would like to install a jig on the power chuck surface. Please tell me the area of the power chuck surface where I can additionally machine.

Please refer to the attachment for the area where additional machining on B200 series, B series and N series is possible.

B-200 series B series N series

When a thin workpiece is machined, the workpiece becomes deformed. How can I stop this from happening?

In order to reduce the deformation of the workpiece, it is necessary to first lower the gripping force of the chuck to the appropriate value.

In order to lower the gripping force of the chuck, it is necessary to lower the thrust of the rotating hydraulic cylinder.

Reducing the thrust of the cylinder may be dangerous. It may cause the work piece to fall out during rotation.

Force calculations for the thrust of the cylinder and the gripping force of the chuck should be mathematically calculated, not judged by eye or guessed.

STEP1

Cylinder thrust calculation
Cylinder thrust = * Maximum piston thrust x {(working pressure - 0.25 MPa) / (*Maximum pressure - 0.25 MPa)}}. Please extract the values for the cylinder model you are using from the cylinders catalogue.
Note: 0.25 is based on mechanical loss

STEP2

Chuck gripping force calculation
Gripping force of chuck = * Maximum stationary gripping force × (cylinder thrust / *maximum allowable input)
Please extract the values for the chuck model you are using from the chucks catalogue.

STEP3

Please make a chuck gripping force management table in order to avoid the workpiece falling out during rotation.

Note: Gripping force also varies depending on the conditions such as the jaw shape and rotation speed.

I would like to know a good way to manage the gripping force of the chuck.

The gripping force of the chuck is determined by the thrust of the rotary hydraulic cylinder. However, it is not always the same. If the machine is cold or has not been used for some time, the cold oil of the hydraulic unit has a high viscosity. Before testing, ensure that the machine and the hydraulic unit is at the operational temperature.
KITAGAWA recommends measuring the actual gripping force using a static gripping force meter (JFT - S100) rather than the calculation. For example, suppose there are two machines of the same specification on a mass production line. Even with exactly the same specification, differences will come out. Therefore, by measuring the gripping force of the actual chuck and adjusting hydraulic pressure of the cylinder, it is possible to reduce the scattering of finishing error by individual machine.

How can I select a rotating hydraulic cylinder?

KITAGAWA recommends a conforming cylinder for each chuck. Please check it in the catalogue.

Oil is leaking out of the cylinder. Is it possible to repair it by myself?

Because special test equipment is required for confirming after repair and special jigs and tools are required depending on the model, cylinder repair is done at a dedicated factory. Please contact your nearest dealer.
We also sell seal kits for cylinders according to customers’ requests. We will not be subject to our warranty if a customer replaces seals. Please check the model and manufacturing numbers of the cylinder and contact your nearest dealer.
The rotary hydraulic cylinder is the most important part of the workholding output.
Mistakes in reassembly can result in the workpiece falling out during rotation, therefore, a fully trained and qualified engineer who has sufficient mechanical knowledge and understands the above content should be capable of repair.

I am using KITAGAWA CHUCK GREASE PRO. Please tell me the most suitable storage method.

·Please keep it in a cool and dark place.
·When storing half-used grease, keep the grease on a flat surface, completely closed.
·If you keep grease in the above condition, the shelf life will be 3 years. Grease that is stored for a long time loses the lubrication function so we recommend using it as soon as possible.
Degraded grease develops a different/darker colour, develops a noxious smell and a large amount oil will float on the surface. Please use these indicators as a guide.

Is there the Safety Data Sheet of KITAGAWA CHUCK GREASE PRO available?

Please download here below.
Safety Data Sheet in English (PDF)

Is there a "recommended air circuit diagram" for the KPC chuck?

There is a reference configuration diagram of the air circuit. Please refer to here.

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