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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.
Table of contents Introduction Safety Information Safety Precautions 1. Construction and Operation ........1.1 Model Coding............. 1.2 Construction and Operation....... 2. Installation ..............2.1 Unpacking ............2.2 Accessories ............2.3 Preparations for Installation ......2.4 Stroke Control ............ 2.5 Setting up for Inside Gripping ......2.6 Installation Procedure ........
Introduction 1. This instruction manual describes the 3-jaw swing lock chuck H3US (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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Use ISO VG68 lubricating oil or equivalent. 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.
Size No. 6, 8, 10, 12 Fig. 1 1.2 Construction and Operation Model H3US 3-jaw swing lock chuck is designed for initial machining of castings and forged work pieces and basically composed of a chuck body, plunger, locker arm and locker ball.
Please refer to the section 6. 5 “Accessories” for particulars. 2.3 Preparations for Installation Except the direct-mount chuck of H3US 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.
2.6 Installing Procedure Fig.3 2.6.1 Before Installation After taking the chuck out of the package box, wipe off all anticorrosive oil clinging to it with a cloth permeated with cleaning oil. 2.6.2 Installing Chuck Adapter Install the chuck adapter on the spindle end face. Then the chuck installing socket (C) and datum face should be machined in place.
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(4) Insert the Hex. key spanner equipped from the front side of the chuck and check to see whether the draw screw can be turned. (5) Hoist the chuck with the chain block and screw in the draw screw into the connecting rod until it can be tightened no more.
2.6.4 Inspection Operational resistance develops when there is some abnormality in the installation procedure. If the chuck is used without removal of the resistance, parts seizure or abnormal wear may occur, causing marked shortening of service life. Once the installation has been completed, be sure to check out the minimum operating pressure.
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.
(3) Use two mounting bolts to install a top jaw. If the standard top jaws Fig. 8 are installed using the attached mounting bolt, the screw depth of the bolt against the jaw nut meets the specified value. If other bolts are used, screw the bolts so that the top of the bolt should be within 0.5 to 1 mm from the bottom of the jaw nut.
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Fig. 10 OD gripping ID gripping ●Prepare a formed plug. ●Prepare a formed ring. Refer to Fig.11 and Table9 for the Refer to Fig.12 and Table10 for the forming plug. forming ring. ● Remove the cover in front of the chuck body.
When machining the standard top jaws as top jaws, remove the CAUTION adjacent corners inside as they may interfere. (See Section 6.3 "Standard Top Jaws".) Depending on the shape of the top jaws, it may be necessary to CAUTION remove the top jaws for insertion of the formed plug and, after forming, remove them again for removal of the plug.
Fig. 14 (2) After choosing work piece gripping position, determine the top jaw shape so that the parts besides the gripper should not contact with the work piece. The gripper installation surface should be cylindrical having inside diameter of gripping diameter (φA) and dimension B (Table 11) added.
3.6 Setting Working Conditions The chuck using conditions includes not only cutting force but also many factors such as cutting force, work gripping length, work protruding length, friction coefficient, and rotational speed. In order to determine the ideal working conditions, all of these factors must be given due consideration, with considerable time necessary to perform the calculations.
3.7 Precautions for Operation We are the chuck manufacturer, and are not responsible for the safe operation of the combined chuck and lathe or machining center into which the chuck is installed. There exist numerous rules and guides for overall safe operation among the most respected is ANSI B11.6- 1984. Nonetheless, while reference may be made to ANSI and/or specifications, mere mechanical compliance with ANSI and/or other standards does not ensure safety.
3.7.2 When Gripping Work piece When gripping the work piece with the chuck, be careful not to get CAUTION any part of your body caught between the top jaws and the work piece or between the work piece and the machine. The operator's hand may be injured.
3.7.4 End of Operations Remove the work piece from the chuck at the end of operations. If WARNING the work piece is left gripped in the chuck, the cylinder supply pressure may decrease, or the work piece may fall oft due to mistaken operations, it may cause severe personal injury and machine damage.
4.2 Disassembly and Cleaning Even with proper lubrication, fine chips or scale can enter the chuck to jam the area of the jaw guide or wedge plunger, thus preventing smooth operation. Disassembly and cleaning must be done on a regular basis every 1000 hours. When doing so, inspect carefully for parts wear and breakage, replacing as necessary.
4.3 Setting Safe Rotational Speed ANSI B 11.6-1984 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.
Hex. socket head bolt O-ring Hex. socket head bolt O-ring Hex. socket head bolt ※ 12 inch use six parts, and other sizes use three parts. Seal List H3US Parts Name Q'ty Howa genuine Howa genuine Howa genuine Howa genuine...
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 Specifications Dimensions Series number Series H3US H3US number Specifications Symbol Top jaw movement (Dia.) 12.4 12.4 at X2 (See Note 1.) Plunger stroke 11.4 14.4 17.5 17.5 (Cylinder stroke) Maximum OD chucking 12~120 16~150 50~205 63~240...
6.2 Gripping Force Static gripping force :The gripping force depends on the height from the end face of the chuck to the gripping surface, X. Dynamic gripping force :This represents the gripping force of standard top jaws during chuck rotation at the point away from the end face of the chuck toward the gripping surface by dimension of X2.
6.4 Allowable Machining Area of Chuck Body Tapped and/or pin holes necessary for mounting a stopper or rough guide may be additionally machined on the chuck body within the boundaries defined below. NOTE: The periphery of each additional hole should be at least 2 mm away from the boundary. The holes should be located and sized to maintain the chuck in balance.
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