Inner diameter processing of an 8-point star-shaped collet | Shape engraving discharge and blind holes
Example of inner diameter processing of a tapered octagonal star shape. Consideration is given to the discharge of chips from the stopped shape and electrode wear, while pursuing sharp corners in the valley area.
At Hanshin Seiko, we accept consultations for inner diameter processing of special collets using shape-engraving electrical discharge machining, as well as for complex shapes such as star-shaped and polygonal designs. The case presented involves inner diameter processing of an octagonal star-shaped collet with a tapered stop shape of 12/100 and a depth of 9.5mm. Sharp pin angles were required in the valley portions of the star shape. In addition to electrode design that considers discharge gap and electrode wear, we examine the relationship between electrode reduction allowance and swing amount. We pursue processing conditions that maintain the taper shape while preventing corners from becoming excessively rounded. For stop shapes, we also consider the flow of processing fluid to ensure that chips do not accumulate at the bottom or in the valleys. Please consult us regarding inner diameter shapes that are difficult for cutting tools to access, as well as special shapes with bottoms. Along with your drawings, please provide material, processing depth, required tolerances, allowable corner R, quantity, and desired delivery date.
Inquire About This Product
basic information
【Processing Conditions for Case Study】 Processing Target: Inner diameter of an octagonal star-shaped collet Processing Method: Sinker EDM (Electrical Discharge Machining) Inner Diameter Shape: Octagonal star shape Taper: 12/100 Processing Depth: 9.5mm Hole Shape: Blind hole shape (not through) Required Shape: Sharp pin corners in the valleys of the star shape Considerations: Electrode shape, discharge gap, electrode wear, oscillation amount/pattern, chip removal *The above are the conditions for an individual case. The pin corners do not guarantee a corner radius of zero. Usable corner radius and dimensional accuracy will be provided after confirming material, shape, depth, etc.
Price information
This is an individual estimate for each drawing. We will confirm the material, inner diameter shape, machining depth, taper, required tolerances, allowable corner radius, quantity, and details of electrode production to provide the estimate.
Delivery Time
※We will check the drawings, quantities, setup conditions, and equipment operating status, and provide individual guidance. Please let us know the planned delivery date for materials and parts, as well as your desired delivery date.
Applications/Examples of results
【Processing Achievements】 Inner diameter machining of an octagonal star-shaped collet with a tapered shape of 12/100 and a depth of 9.5mm. This case was approached with consideration for the pin angle required in the valleys of the star shape, using shape-cutting electrical discharge machining. 【Machining Services Available for Consultation】 - Inner diameter machining of special collets - Machining of irregular holes such as star shapes and polygons - Machining of blind holes and pockets that do not go through - Machining of special shapes with taper - Machining requiring small corner radii - Precision parts machining requiring dedicated electrodes *This is a contract machining service based on drawings, not standard collet sales.
Company information
Hansei Seiko Co., Ltd. is a precision metal processing company founded in 1948, based in Kobe City, Hyogo Prefecture. We offer integrated processing services centered around wire cut electrical discharge machining, shape electrical discharge machining, and fine hole electrical discharge machining, as well as machining, polishing, finishing, and measurement. We welcome inquiries for precision parts, mold components, jigs, test pieces, and more, whether for single items, prototypes, or small lots. In addition to processing hardened steel, carbide, and stainless steel, we also handle contour machining of thick parts, key grooves, fine slits, and complex shapes. We confirm material, shape, required precision, and application, and consider processing conditions and processes. This reduces the burden of arranging multiple processing locations and supports part manufacturing. Based on the principle of "making according to the drawings," we conduct inspections and measurements in-house to confirm the finish before shipping. Based in Kobe and Hyogo, we accept processing inquiries and quotation requests from across the country. If you have parts you are struggling to process or drawings for which you would like to consider methods and processes, please feel free to consult with us. https://www.hansei.co.jp/
![[MECT2025 Actual Machine Exhibition] Molybdenum Wire Electrical Discharge Machining Machine](https://image.mono.ipros.com/public/product/image/2065685/IPROS68013622882014238.jpg?w=280&h=280)
