ISO 8956:1986 PDF

Name: ISO 8956:1986 — Acceptance conditions for copying attachments, integral or otherwise, for lathes — Testing of the accuracy
SKU: ISO 8956:1986
Price: 25 EUR
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Acceptance conditions for copying attachments, integral or otherwise, for lathes — Testing of the accuracy

Название (английский):

ISO 8956:1986

Acceptance conditions for copying attachments, integral or otherwise, for lathes — Testing of the accuracy

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 11
Дата публикации:: 19 июня 1986 г.
Издание:: ISO IS 8956 edition 1 version 1
ICS:: 25.080.10

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Язык документа:

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Описание (английский):

Describes both special tests and practical tests for hydraulic and electric servo-controlled copying attachments (not for mechanically controlled ones) of general-purpose normal precision (centre lathes, vertical boring machines, capstan lathes or others) and copying lathes. The tests are intended to supplement the tests for the various types of lathes. It also applies to lathes with single-axis copying systems and to lathes where two axes are used in conjunction to produce a profile of up to 180° included angle.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 8956:1986 - "Acceptance conditions for copying attachments, integral or otherwise, for lathes - Testing of the accuracy" - defines accuracy tests and acceptance conditions for hydraulic and electric servo‑controlled copying attachments used on general‑purpose, normal‑precision lathes (centre lathes, vertical boring machines, capstan lathes, copying lathes). It supplements existing lathe acceptance standards by describing both special tests (repeatability, dead‑zone, sensitivity) and practical machining tests (profile and dimensional checks) for single‑axis and two‑axis copying systems up to 180° included angle. Mechanically controlled copying attachments and multi‑axis systems beyond 180° are excluded.

Key topics and requirements

Scope & applicability

Applies to servo‑controlled copying attachments (hydraulic and electric), single‑axis systems and two‑axis systems (≤180°).
Supplements general lathe tests for normal precision machines.

Special tests

Repeatability (positioning): tests using template and dial gauge; example permissible deviation shown in the standard is 0.005 mm for certain repeatability checks.
Dead‑zone and sensitivity: micrometer and dial gauge setups measure control dead band and discrete movement counts; permissible deviations and observation procedures are defined.
Tests are performed at ends and mid‑stroke of copying slides and with the copying unit in operating position or integral with the machine.

Practical tests

Machining of standardized test pieces (chuck or between‑centres) to check diameters, shoulders, tapers, facing profiles and taper regularity.
Specified test piece dimensions and machining sequences for single‑axis and two‑axis systems; permitted dimensional deviations and inspection methods (micrometer, depth gauge, straight edge, slip gauges).

Measurement methods

Use of micrometers, dial gauges, depth gauges, straight edges, slip gauges with defined mounting and measuring directions.

Permissible deviations

ISO 8956 lists numerical tolerances for different tests (examples in the standard include mm and inch equivalents) and requires manufacturer‑specified measuring pressures for some checks.

Applications

Acceptance testing of copying attachments during:

Machine tool manufacturing and final inspection
Supplier quality control and incoming inspection
Workshop qualification, commissioning and periodic verification

Ensures copying attachments meet accuracy required for profile duplication, precision turning and production where template tracing is used.

Who should use this standard

Machine tool manufacturers and designers of copying attachments

Quality assurance engineers and metrology labs performing lathe acceptance testing

Purchasing and commissioning teams buying lathes with servo‑controlled copying units

Maintenance and repair teams verifying restored accuracy after service

Related standards

ISO 1708 - Acceptance conditions for general purpose parallel lathes

ISO 3655 - Acceptance conditions for vertical turning and boring lathes

ISO 6155 (part references) - Acceptance code for machine tools

ISO 230‑1 - Geometric accuracy testing of machine tools

Keywords: ISO 8956:1986, copying attachments, lathe accuracy testing, servo‑controlled copying, acceptance conditions, test pieces, repeatability, dead zone, permissible deviations.

ISO 8956:1986 PDF

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications

Who should use this standard

Related standards

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