EN ISO 28927-2:2009/A1:2017 PDF

Hand-held portable power tools - Test methods for evaluation of vibration emission - Part 2: Wrenches, nutrunners and screwdrivers - Amendment 1: Changes in annex C - Brake device (ISO 28927-2:2009/Amd 1:2017)

Название (английский):

EN ISO 28927-2:2009/A1:2017

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 25
Дата публикации:: 9 августа 2017 г.
Издание:: CEN EN 28927 edition 1 version 1
ICS:: 13.160

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Технические детали

Технический комитет: CEN/TC 231 - Mechanical vibration and shock
SKU: EN ISO 28927-2:2009/A1:2017

Abstract

Overview

EN ISO 28927-2:2009/A1:2017 is a CEN-endorsed amendment to ISO 28927-2 (Part 2 of the ISO 28927 series) that updates test methods for evaluating vibration emission from hand-held portable power tools - specifically wrenches, nutrunners and screwdrivers. Amendment A1 replaces Annex C (brake device specification) and adds Annex D (example brake-block drawings and parts tables). The changes clarify the brake-device design, assembly and test-rig requirements used when measuring tool vibration (hand–arm vibration).

Key topics and technical requirements

Brake device specification (Annex C)
- Socket sizes and weights are defined (see Figures C.1–C.5) to ensure repeatable loading.
- The difference between static and dynamic friction coefficients of the brake must be ≤ 20%.
- Brake force variation during a test run must not exceed ±20%; use of conical disc springs is recommended to meet this requirement (other designs may be used if verified by measurement).
- The mounted test rig must not exhibit resonances in the hand–arm vibration frequency range; recommended practice is bolting the base frame to a concrete block ≥ 400 kg.
Brake-block design and parts (Annex D)
- Includes example drawings, bill-of-materials and sizing for large and small brake devices, brake blocks, cover plates, sockets, springs, bolts and washers.
- Brake blocks may be phenolic laminate or aluminium with a friction lining; lining material must be tested so static/dynamic friction difference is

Overview

Key topics and technical requirements

Brake device specification (Annex C)
- Socket sizes and weights are defined (see Figures C.1–C.5) to ensure repeatable loading.
- The difference between static and dynamic friction coefficients of the brake must be ≤ 20%.
- Brake force variation during a test run must not exceed ±20%; use of conical disc springs is recommended to meet this requirement (other designs may be used if verified by measurement).
- The mounted test rig must not exhibit resonances in the hand–arm vibration frequency range; recommended practice is bolting the base frame to a concrete block ≥ 400 kg.
Brake-block design and parts (Annex D)
- Includes example drawings, bill-of-materials and sizing for large and small brake devices, brake blocks, cover plates, sockets, springs, bolts and washers.
- Brake blocks may be phenolic laminate or aluminium with a friction lining; lining material must be tested so static/dynamic friction difference is

EN ISO 28927-2:2009/A1:2017 PDF

Технические детали

Abstract

Overview

Key topics and technical requirements

Похожие стандарты

Abstract

Overview

Key topics and technical requirements

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