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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.
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Table of contents Introduction Safety Information Safety Precautions 1. Construction and Operation ........4 1.1 Model Coding............. 4 1.2 Construction and Operation....... 4 2. Installation ..............4 2.1 Unpacking ............4 2.2 Accessories ............5 2.3 Preparations for Installation ....... 5 2.4 Stroke Control ............
Introduction 1. This instruction manual describes the HIGH SPEED type 3-jaw through-hole draw down power chuck H3ET (standard model). 2. Please read this manual carefully and fully understand the procedures for installation, operation, inspection, and maintenance before operating the chuck.
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Safety Safety Precautions Precautions Safety Safety Precautions 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.
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Howa. Any and all warranties are invalid unless only Howa’s genuine parts are used. The H3ET chucks cannot grip the inside diameter of the work piece. Gripping the inside diameter will cause poor gripping accuracy and insufficient gripping force. This, in turn, may cause the work piece to fly off and may cause severe personal injury or death to the operator or bystanders.
1. Construction and Operation 1.1 Model Coding The HIGH SPEED type 3-jaw through-hole draw down power chucks are sorted as follows. H3ET JIS-specified spindle nose No. No mark: : : : Having a straight socket for installation of chuck (standard model) :...
Please refer to the section 6. 5 “Accessories” for particulars. 2.3 Preparations for Installation Except the direct-mount chuck of H3ET□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.
2.4.3 Thread-Cutting on Draw Screw The female thread in the draw screw (J) must be cut to match the screw diameter of the connecting pipe. The maximum thread cutting diameters are indicated in Table 1 for various chuck types and sizes. Ensure that the runout does not exceed the tolerance indicated in Fig. 4. Fig.
2.5.6 Installing Chuck (1) Remove the top jaws and cover before Fig. 7 attempting to install the chuck. (2) The chuck has a screw hole for the eyebolt on the periphery. Screw the attached eyebolt into this hole and lift the chuck.
Use extra care when operating the hydraulic or pneumatic circuit CAUTION during the chuck installation. If you actuate such circuits accidentally during chuck installation, you may be caught between the chuck body and the spindle or between the top jaw, resulting in injury. (6) Secure the chuck body to the chuck adapter using the chuck installing bolts provided as accessories.
Howa. For all the chuck parts including consumables, place an order with WARNING Howa Machinery, Ltd. Howa assumes no responsibility for accidents caused by use of the parts not prepared by Howa. Any and all warranties are void unless only Howa genuine parts are used.
3.2 Installing Top Jaws Fig. 11 (1) Select the top jaws in terms of the work piece and install them on the chuck. Before doing so, however, clean off the fitting portions of the top jaw and draw bar with a compressed air blow.
(3) Install the top jaws to the specified position on the draw bar using bolts indicated in Table 6. Use the fastening torque for the bolts as indicated in Table 6. Fig.13 Table 6 Chuck size Bolt size Depth of draw bar screw Length of top jaw screw Thickness of top jaw bolt washer...
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Fig.15 1 1 1 1 ●Prepare a ring for forming the top jaws. ・In case using the standard top jaws, determine of a forming ring referring Fig.16 and Table 7. ・The finish of φd part is to be around ▽▽▽. Forming ring should have enough rigidity to avoid the deformation by the clamping force.
3.4 Installing Stopper The draw down chuck cannot grip stably if the work piece is not positioned in the chuck's axial turning direction. To position the work piece here, the Fig.17 work piece must be pressed against the chuck's work face, but in some cases, depending on the work piece configuration, a stopper has to be equipped on the front face of the chuck.
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 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 workholding 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.
Insufficient lubrication will lead to lower gripping force and create WARNING abnormal friction and seizure. If the cutting is done in such conditions, the work piece will come off and may cause severe injury or death to the operator and/or bystanders. Lubrication with non-specified lubricants may also permit extraordinary corrosion and/or wear and will lead to a loss of gripping force.
4.4 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.
O-ring Draw bar O-ring Top jaw (Soft jaw) Shaft Hex. socket head screw Grease nipple ※ 12 inchs size only Seal list H3ET Parts Name Q'ty O ring P32 (JIS) P38 (JIS) P38 (JIS) O ring P80 (JIS) P102 (JIS)
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 not operate Damaged parts on chuck. Disassemble and repair. Seizure of sliding contact part.
6. Specifications 6.1 Specifications Series number H3ET Specifications Jaw movement (Dia.) Plunger stroke (Cylinder stroke) Max. Recommended outside chucking diameter for Min. standard soft jaws (Note1) 7000 6000 4500 Max. Speed r/min Max. input force Clamping force at Max. input force (Total jaw force) kg・m...
6.3 Gripping Force The following graph shows the gripping force of the rotating chuck equipped with the standard soft jaws. This diagram is drawn in the condition that the jaw stroke is middle and using standard top jaws. 6.4 Standard Soft Jaws The following table shows the dimensions of standard soft jaws.
6.5 Accessories The package box contains the accessories besides the chuck itself. Chuck size Q'ty Part name Hex. socket head bolt for mounting L=95 L=105 L=105 the chuck Hex. key spanner B=10 B=14 B=14 each B=12 Special wrench for ○ ○...
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