1、A .E. C. M. A. STAN DAR D NORME A.E.C.M.A. A.E.C.M.A. NORM Edition approved for publication 28th February 1990 prEN 3612 Issue P 1 February I990 Comments should be sent within six months C8 Chairman A.E.C.M.A. Mr. WILLIAMS after the date of publication decision 88, Bd. Malesherbes 75008 PARIS - FRAN
2、CE EDITE PAR LASSOCIATION EUROPEENNE DES CONSTRUCTEURS DE MATERIELAEROSPATIAL 88, boulevard Malesherbes, 75008 PARIS - TEL, 45-63-82-85 UDC : Key words : ENGLISH VERSlON Aerospace series Undercuts for splines Srie arospatiale Gorge de dgagement pour cannelures Luft- und Raumfahrt Freistiche fr Verza
3、hnungen This .Aerospace Series pre-standard has been drawn up tinder the responsibility of AECMA (Association Europenne des Constructeurs de Matriel Arospatial). It is published on green paper for the needs of AECMA-Members. It has been technically approved by the experts of the concerned Commission
4、 following comment by the Member countries. Subsequent to the publication of this pre-standard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and signature of the A
5、ECMA Standard Checking Centre (NPS) and formal agreement of the Official Services of the Member countries it willbe submitted as a draft European Standard to CEN (European Committee far Standardization) for final vote. 1 Scope This standard defines the undercuts for splines, when splines are manufac
6、tured with slotting tools. The undercuts provide a cavity for slotting tool runout and.chip clearance. 2 Dimensions for undercuts Figure 1 - Undercuts for external splines . -. -. . . ., k DE I I A Figure 2 - Undercuts for internal splines Table 1 - Dimensions for undercuts Dimensions in mm Dimension A depends on the spline length (L) an on the tooth heighE. Table 2 Dimensions in mm A t 0,25 L/12 t 0,8 M I M = module I
