Kemmler Main Catalog Precision Tools Page 841
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Pull studs Pull studs are an important link between machine and tool. The tightening bolt allows the clamping gripper of the spindle to pull the tool holder firmly into the spindle and eject it automatically. Pull studs / Retention knobs come in different designs and sizes. They are not interchangeable. In addition to the pull studs according to DIN ISO 7388-3 (formerly DIN 69872), there are a variety of factory standards specified by the respective machine tool manufacturer. Application: - For tools with steep taper shank ISO 7388-1 and ISO 7388-2 [formerly DIN 69871 and JIS B 6339 (MAS-BT)] - In machining centres (machines with automatic tool changer) - In NC machines (machines without automatic tool changer) - For tools with axial coolant supply - For tools with or without axial coolant supply Only use the pull studs that are specified by the machine tool manufacturer. Locking Drawbar Pull Stud Clamping Unclamping Recommended torque for pull stud tightening: SK / BT / ISO 30 20 Nm SK / BT / ISO 40 50 Nm SK / BT / ISO 50 100 Nm Normative references: DIN ISO 7388 consists of the following parts, under the general title Tool shanks with 7/24 taper for automatic tool changers: - Part 1: Dimensions and designation of shanks of forms A, AD, AF, U, UD and UF - Part 2: Dimensions and designation of shanks of forms J, JD, and JF - Part 3: Retention knobs for shanks of forms AC, AD, AF, UC, UD, UF, JD, and JF 13 DIN ISO 7388-3 Tool shanks with 7/24 taper for automatic tool changers – Part 3: Retention knobs for shanks of forms AC, AD, AF, UC, UD, UF, JD and JF (ISO 7388-3:2013), English translation of DIN ISO 7388-3:2015-03 DIN ISO 7388-3 is a replacement for DIN 69872:1988-07 K43 13.44
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