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. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provide
6、d by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-1 Scope This standard defines the undercuts for splines, when splines are manufactured with slotting tools. The undercuts provide a cavity for slotting tool runout and.chip clearance.
7、2 Dimensions for undercuts Figure 1 - Undercuts for external splines . -. -. . . ., Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-k DE I I A Figure 2
8、 - 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 Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
