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Summary of Contents for HOWA MACHINERY H3KB
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Be sure to read and understand this 本取扱説明書をよく読み, 内容を十分理解した instruction manual thoroughly before 上でこの製品を使用してください。 operating this product. この取扱説明書は大切に保管し, 製品の所有者 Please save this manual. When が変わった場合, この説明書も新しい所有者に ownership of this product is transferred, 手渡してください。 submit this manual to the new owner. 豊和工業株式会社 HOWA MACHINERY, LTD.
Introduction 1. This instruction manual describes the high-speed through-hole power chuck H3KB (standard model). 2. Please read this manual carefully and fully understand the procedures for installation, operation, inspection, and maintenance before operating the chuck. 3. Ignoring any instructions in this manual may result in a serious accident or machine damage, leading to injury to the operator or personnel near the machine.
Safety Precautions The following precautions apply to handling, maintenance, and operation of the chuck. Read and understand them carefully before use. DANGER Never operate the rotating cylinder selector valve while the spindle is rotating. Otherwise, the gripped work piece may come off and fly out. Never put any part of your body inside the spindle cover while the spindle is rotating.
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(supplied from Dow Corning Corporation) For all the chuck parts including consumables, place an order with Howa Machinery, Ltd. Howa shall not be liable for any accidents caused by use of parts not supplied from Howa. Any and all warranties are invalid unless only Howa’s genuine parts are used.
1. Construction and Operation 1.1 Model Coding The through-hole power chucks are model coded as follows: H3KB JIS-specified spindle nose No. No mark: : : : Having a straight socket for installation of chuck. (standard model) : Including an adapter or a back-plate Spindle nose No.
Please refer to the section 6. 5 “Accessories” for particulars. 2.3 Preparations for Installation Except the direct-mount chuck of H3KB-A type, a chuck adapter is needed to install the chuck onto the lathe spindle. Contact us if you need information on how to design a chuck adapter.
Fig. 3 Table 1 (mm) Chuck size M112 The connecting pipe must keep enough wall thickness to ensure WARNING the strength even after threading. Caution, stated in the paragraph 2.4.3, for processing the screw must be strictly kept for securing ample strength of a draw screw. If neglecting confirmation alternatively, instantaneous loss of gripping force to the chuck will cause by breakage of the connecting pipe or draw screw.
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Fig. 6 (3) Advance the connecting pipe to the advance end by activating the hydraulic circuit. In this state, the distance Re between the front end face of the chuck adapter and that of the connecting pipe will be as shown in Table 3. If the dimension Re is greater than that indicated in Table 3, the CAUTION chuck cannot be installed.
Fasten the chuck installing bolts with recommended tightening WARNING torque. If the torque is largely different from the recommended value, lower or higher, the bolts may break and the chuck and/or work piece may fall out; this presents a hazard that may cause severe personal injury or death to the operator or bystanders.
For all the chuck parts including consumables, place an order with WARNING Howa Machinery, Ltd. Howa shall not be liable for any accidents caused by use of parts not supplied from Howa. Any and all warranties are invalid unless only Howa’s genuine parts are used.
(2) The top jaws engage with the serration on the master jaws, and the arrangement is secured with the jaw nuts and bolts. This construction is adjustable only within a certain range for the top jaws and master jaws. Adjust the top jaw position between the minimum and the maximum dimensions indicated by "O" in the table of dimensions (see 6.2).
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Do not grip near the end of the jaw stroke. WARNING Forged or molded work pieces have surface irregularity as far as they are not machined. The chuck may not be able to grip such a work piece in a stable state. Gripping a forged or molded work piece, not machined, near the end of the jaw stroke will cause insufficient gripping force, and the application of the tool to the work piece may cause the work piece to slip out of the jaws and fly off.
Remarks When machining a bar stock, keep in mind that the chuck may lose stable gripping force and the work piece may slip because a long work piece may vibrate and the top jaws cannot firmly grip a work piece with a smaller diameter. In such a case, secure a greater gripping length in the axial direction to improve gripping stability.
3.5.1 Permissible Cylinder Force The permissible cylinder force indicated in the specification table or catalogue is the maximum cylinder force at which the chuck will not suffer damage, presuming those standard soft jaws or standard hardened jaws are used. This maximum force may be used as required, of course, but ordinarily long-term use under conditions of maximum force is not recommended.
3.6.1 Before Gripping Work piece Before beginning operations, check to be sure that the pneumatic WARNING or hydraulic pressure needed to operate the chuck is being supplied to the rotating cylinder. If not supplied or not sufficient, the work piece could slip out and fly off as the cutting starts, and may cause severe injury or death to the operator and/or bystanders.
3.6.3 During Cutting Operations In any of the following cases, the tool impact on initial cutting WARNING contact may result in an unexpected cutting force in excess of chuck work holding capacity: The back end of the work piece is away from the chuck’s stopper face.
4. Maintenance 4.1 Lubrication The most frequent cause of chuck failure is insufficient or improper lubrication. If lubrication is insufficient or if a non-specified lubricant is used, not only will wear be accelerated, the gripping force will be inadequate, with the possibility of the work piece coming off during the cutting operation.
4.3 Setting Safe Rotational Speed ANSI B11.6-1984 section 7.1.9 suggests guidelines for setting a safe rotational speed. A safe rotational speed will be a function of the consideration of among other things, the degree of wear and tear then existing on the jaws of the chuck, which may effect their ability to grip the work piece.
4.4 Parts List Parts Name Q'ty Parts Name Q'ty Chuck body Hex. socket head button bolt 3 or 6 Pilot bushing Hex. socket head bolt Note.1 Wedge plunger Spring Draw screw Steel ball 6 or 9 Retainer Hex. socket head bolt Note.2 Master jaw Hex.
5. Troubleshooting When there are any troubles with the operation of the chuck, the following causes are likely. Please check these before contacting us for service. Trouble Possible cause Recommended remedy Chuck does Damaged parts on chuck. Disassemble and repair. not operate Seizure of sliding contact part.
6. Specifications 6.1 Specifications H3KB Series number Specifications Serration pitch Jaw movement (Dia.) 10.6 Plunger stroke (Cylinder stroke) Max. Recommended outside chucking diameter for standard soft top jaw Min. (Note 1) Max. rotational speed r/min 5650 4600 4200 2800 Max. input force Clamping force at Max.
6.3 Gripping Force The following graph shows the gripping force of the rotating chuck equipped with the standard soft jaws. 6.4 Standard Top Jaws The following table shows the dimensions of standard soft jaws. Chuck size 17.5 13.5 17.5 30° 15°...
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