Din 7161 Pdf Extra Quality ((link)) [BEST]

standard, titled "ISO deviations for holes for sizes from 1 to 500 mm"

• It provides a clear reference table for inspectors. If a dimension on a drawing lacks a specific tolerance, the inspector knows exactly what the allowable deviation is based on the standard cited in the drawing header.
• This speeds up the inspection process and ensures consistency across different batches and suppliers.

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Extra Quality PDF

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6. Manufacturing processes to achieve extra quality

• Machining sequence: Rough turning → semi-finish grinding → stress-relief (if required) → finish grinding → superfinishing/honing → final inspection.
• Grinding practices: Use of stabilized wheels, coolant control, minimal infeed per pass, dressing strategies to minimize wheel-induced form errors.
• Superfinishing: Abrasive belt/stone honing or lapping to reduce subsurface damage and achieve fine Ra.
• Thermal control: Process fixtures, temperature-stable environment, and compensation for thermal growth are critical for µm-level tolerances.