Case study of spline machining with an inner diameter of 0.8 and 21 teeth. Even small diameter shapes that are difficult to handle with gear cutting equipment will be considered using dedicated electrodes for shape-EDM.
At Hanshin Seiko, we accept consultations for machining the inner diameter splines and internal gear shapes of shafts using shape-cutting electrical discharge machining. The case presented involves machining a tooth profile with a module of 0.8, 21 teeth, and a reference pitch circle diameter of φ16.800mm on the inner diameter of a shaft made of SCM435. We tackled this small-diameter shape, which was difficult to process with the client's gear machining equipment, using a dedicated electrode that matched the tooth profile. We considered the electrode dimensions and machining allowance while taking into account the discharge gap and electrode wear. We aligned the reference of the shaft with the center and axial posture of the electrode, paying attention to the tooth thickness and depth shape. We also considered the discharge of machining chips generated deep within the inner diameter, examining the operation of the machining fluid and electrode. If you have inquiries such as "I can't find a machining source for a small inner diameter" or "I want to add a tooth profile inside the shaft," please send us your drawings. We will confirm the material, heat treatment condition, tooth profile specifications, machining depth, required precision, quantity, and desired delivery date, and provide guidance accordingly.
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basic information
【Specifications of the Published Case Drawings】 Material: SCM435 Product Shape: Shaft Processing Details: Inner Diameter Spline / Internal Gear Shape Processing Method: Shape Electric Discharge Machining Module: 0.8 Number of Teeth: 21 Pressure Angle: 20° Twist Angle: 0° Reference Pitch Circle Diameter: φ16.800mm Tooth Profile: Standard / Straight Tooth Tooth Profile Reference Plane: Tooth Perpendicular Total Tooth Height: Special Specified Accuracy Grade: JIS B 1702-1 N8 Grade *The above is the specified specification of the drawing. N8 grade does not indicate inspection measured values or uniform guarantee grades. The reference pitch circle diameter differs from the tooth tip diameter and the hole diameter before processing.
Price information
This is an individual estimate for each drawing. We will confirm the material, heat treatment condition, tooth shape, module, number of teeth, machining depth, required precision, quantity, and details of electrode production to provide the estimate.
Delivery Time
※We will check the tooth shape specifications, processing depth, electrode production, quantity, and equipment operating status, and provide individual guidance. Please let us know the scheduled delivery date for the parts and your desired delivery date.
Applications/Examples of results
【Processing Achievements】 A spline shape with a module of 0.8 and 21 teeth was formed on the inner diameter of a shaft made of SCM435 using shape-cutting electrical discharge machining. This is an example of manufacturing small-diameter tooth profiles that were difficult to handle with gear processing equipment. 【Processing Services Available】 - Inner diameter spline processing of shafts - Processing of small-diameter internal gear shapes - Parts where the entry and escape space for cutting tools is restricted - Additional processing of tooth profiles inside shafts - Shape-cutting electrical discharge machining including the production of dedicated electrodes *This is a contract processing service based on drawings, not the sale of standard shafts.
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/
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