: Type E undercuts are exclusively used when only the cylindrical surface requires subsequent finish-machining (such as grinding or turning), while the perpendicular shoulder face does not require identical machining.
The latest version, , expanded on previous versions (dating back to 1966 and 1998) by adding tolerance values and surface finish recommendations in addition to the dimensional specifications provided by the international standard DIN EN ISO 18388 . Therefore, referring to a part as "DIN 509 Exclusive" suggests that the component adheres to these strict, latest-generation tolerances, which is a mark of high-quality precision.
According to DIN 509:2006-12 standards, the E0.6x0.2 undercut requires strict tolerances, particularly when used in high-precision applications. Value/Symbol Description Relief grooves for turned parts Type Type E Undercut Radius r = 0.6 mm Radius of the cutting tool corner Depth t₁ = 0.2 mm Depth of the undercut Designation DIN 509—E0.6x0.2 Standard representation
Providing a 0.2 mm deep clearance pocket allows components like bearings, collars, gears, and bushings to slide into a definitive axial position without obstruction. This directly ensures predictable machine timing and spatial stack-up accuracy.
The precision engineering keyword refers directly to a highly specific, standardized mechanical manufacturing feature: a Type E undercut with a 0.6 mm radius and 0.2 mm depth defined under the German Institute for Standardization (DIN) 509 standard . This specific relief groove configuration is essential for manufacturing rotationally symmetric turned parts where mating parts must fit perfectly flush against a shoulder. din 509e06x02 exclusive
This form specifies a single-sided undercut carved into the cylindrical face of the shaft while extending slightly into the perpendicular planar shoulder. Type E undercuts are ideal when the flat shoulder does not face extreme cyclic fatigue loads, and when subsequent grinding or finishing operations are required on the outer diameter. 06 (Radius = 0.6 mm): The cutting radius (
When designing a part with a undercut, engineers should adhere to the following:
The "exclusive" nature of the E0.6x0.2 undercut lies in its application for . Unlike Type F, which covers two perpendicular surfaces, Type E is focused solely on the cylindrical surface. Forms and dimensions of undercuts - sharifcadcam.ir
If a standard 12µm coating has a single pore, corrosion concentrates there, forming a deep crater that reaches the substrate within 48 hours. In the exclusive 6µm system, the current is spread across millions of pores, resulting in superficial "white rust" only after 200+ hours. : Type E undercuts are exclusively used when
Unfortunately, I couldn't find a publicly available copy of the standard or a detailed description of its contents. However, I can suggest some possible areas where this standard might be relevant:
Executing an E0.6x0.2 undercut flawlessly on a CNC lathe demands high precision and rigid tooling setups:
It is paramount that engineers and manufacturers adhere to the official specification when implementing DIN 509. This includes correctly following all dimensions, tolerances, and surface finish requirements, which are critical for the safety and function of the final product.
The 0.6 mm radius ensures a gradual transition between the shaft's shoulder and its journal, reducing the risk of fatigue failures compared to sharper, smaller undercuts. 3. Precision Manufacturing According to DIN 509:2006-12 standards, the E0
: Grinding wheels possess slightly radiused edges. Without a pre-machined undercut, a wheel cannot polish a shaft all the way to its shoulder without wearing down unevenly or leaving an un-machined ridge.
Ensure you are using the correct DIN 509 standard (2006) for accurate 3D modeling and manufacturing. If you are selecting an undercut for a high-fatigue shaft, consider the stress advantages of the E0.6x0.2 radius. Forms and dimensions of undercuts
As noted in the initial search results, the numeric string "509E.06" appears in automotive parts databases as a stabilizer bar mounting bushing for the and Peugeot 307 platforms.