Competition is hard enough, and the industry needs a single, international standard. You must be logged in to post a comment. Check out these resources for… How to calculate motor drive torque for ball screws Ground vs. Rolled Ball Screws: Does manufacturing method matter? Leave a Reply Cancel reply You must be logged in to post a comment. Only then will the proposal be accepted and work on the standard can begin. If there is an existing International Standard on the subject, it will be adopted, unchanged, as the European Standard.
If this is not the case, the responsible working body will draw up a manuscript for the draft standard prEN. The draft standard is distributed to the national standards organizations for commenting in what is called the "public enquiry" stage. National comments are to be submitted within three months. The national mirror committee discusses all comments received and submits the consolidated national standpoint. On the basis of the comments received, the responsible working group can either decide to publish the standard or to draw up and issue a final draft.
In a formal vote over a two month period, the members then decide whether to accept this final draft as a European Standard. There is no public enquiry for the final draft. Approval of the final draft requires at least 71 percent of the weighted votes of CEN members. Ratification of a European Standard takes place following positive voting.
After ratification, the European Standard must be adopted, unchanged, as a national standard, and any conflicting national standards withdrawn. In addition, a standard that has been developed at international level can be simultaneously adopted as a European Standard by means of parallel voting procedures in accordance with the Vienna Agreement.
Such standards are also to be automatically adopted by the national standards organizations. International Standards are developed by ISO or IEC, for electrotechnical standards according to the national delegation principle, with each country sending a delegation of experts to represent the national standpoint.
In Germany's case, DIN sends the delegation. This standpoint is developed in national committees that "mirror" the international committees. By taking on the secretariat of an international committee, national members such as DIN can play a leading role in the committee's work. The mirror committees also decide whether or not an International Standard should be adopted as a national standard - this is voluntary, in contrast to the European Standards, which must be adopted nationally.
As at national level, international standards work begins with a "new work item proposal". A simple majority of national standards organizations with an interest in the subject matter is required for the proposal to be approved. In addition, a sufficient number of these must also agree to participate in the work.
Within two months a "committee draft" is circulated among the members of the responsible Technical Committee for voting. A draft is drawn up taking any comments received into consideration. The draft standard is then made available to all ISO or IEC members, who have three months to submit their national position and comments.
Within a two-month period, anyone may comment on this draft for example via DIN's German-language draft standards online portal. The national mirror committee discusses all comments received and submits the consolidated national viewpoint to ISO. If the criteria for approval are fulfilled during the voting procedure, the draft is then published as an International Standard.
If they are not fulfilled, or if the responsible working group so decides, a Final Draft is published. No comments are submitted during this voting period. Acceptance of the Final Draft requires a two-thirds majority of all active members participating, and not more than a quarter of all votes may be negative.
Ratification of an International Standard takes place following positive voting. In addition, a standard that has been developed at European level can be simultaneously adopted as an International Standard by means of parallel voting procedures in accordance with the Vienna Agreement.
Such standards are to be automatically adopted by the national standards organizations. DIN's Statutes lay down the principles and goals of German standardization.
The German Standardization Strategy sets out the goals of German industry, politics, research and standardization. Standardization is a key strategic instrument for companies of all sizes. We will have a grid of logos, when clicked takes you to their estore website. Prevailing torque type all-metal hexagon nuts , style 2 — Property classes 5, 8, 10 and Height of nut changed; width across flat according to ISO included. Prevailing torque type all-metal hexagon nuts, style 2, with metric fine pitch thread — Property classes 8, 10 and Countersunk flat head screws common head style with type H or type Z cross recess — Property class 4.
Nominal size changed; head dimension changed; thread length changed; strength 8. Countersunk raised head screws common head style with type H or type Z cross recess — Product grade A. Hexagon thin nuts chamfered with metric fine pitch thread — Product grades A and B. Dimensions partially changed; width across flats according to ISO ; strength Fine thread omitted to be included in a separate standard later ; width across flat M10 changed.
Correlation of dimensions with DIN , except for the width across flat of the nut M In tables 1 and 2 abbreviations changed and some specifications thread dimensions changed. Standard divided by regular type screw threads and fine threads; width across flats according to ISO changed; nominal size range changed; fine thread see ISO Hexagon thin nuts unchamfered with metric fine pitch thread — Product grades A and B. Standard divided by regular type screw threads and fine threads; width across flats according to ISO changed; nominal size range changed; regular type screw thread see ISO
0コメント