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A cylinder with longitudinal draft
Profile view of a drafted cylinder with the draft dimension

In engineering, draft is the amount of taper for molded or cast parts perpendicular to the parting line. It can be measured in degrees or mm/mm (in/in).

Consider the fabrication of a hollow plastic box, without lid. Once the plastic has hardened around the mold, the mold must be removed. As the plastic hardens, it may contract slightly. By tapering the sides of the mold by an appropriate "draft angle", the mold will be easier to remove.

If the mold is to be removed from the top, the box should taper in towards the bottom, such that measuring the bottom internal dimension will yield a smaller length and width than measuring the top from which the mold is extracted.

By specifying the opening length and width, a draft angle, and a depth, it is not necessary to specify the dimensions for the internal surface, as these may be calculated from the above.

The manufacture of a part that incorporates zero or negative angles may require a mold that can be separated into two or more parts, in order to release the casting.

External links[edit]


Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Draft_(engineering) — Please support Wikipedia.
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62 news items

eCoronado.com (blog)

eCoronado.com (blog)
Wed, 25 Mar 2015 11:56:15 -0700

Regarding the study of SR75, Walton explained, “the Draft Engineering and Traffic Study of SR75 included Third and Fourth Streets from the Toll Plaza to Orange Avenue and Orange Avenue/Silver Strand from Fourth Street to NAB [Naval Amphibian Base].

NJ Spotlight

NJ Spotlight
Thu, 12 Mar 2015 22:03:45 -0700

Last November, a magistrate judge in New York ordered all insurance companies in his district involved in Sandy-related litigation to turn over thousands of draft engineering reports to homeowners who may have been similarly affected. The following ...

International Business Times

International Business Times
Mon, 02 Mar 2015 10:00:00 -0800

Fearing such a practice could be “widespread,” Brown and a panel of fellow magistrates ordered insurance companies to turn over all draft engineering reports in pending cases. Wright Flood, U.S. Forensic, and HiRise Engineering all declined to be ...

Keizertimes

Keizertimes
Fri, 06 Mar 2015 09:03:45 -0800

The roundabout at Chemawa Road and Verda Lane, shown here in a draft engineering version, has been pushed back to 2016, after originally being planned for last year. (Submitted). By CRAIG MURPHY. Of the Keizertimes. In between Groundhog's Day ...

Vineland Daily Journal

Insurance Business America
Tue, 06 Jan 2015 07:10:05 -0800

23 letter from the US Department of Justice to the US District Court of New Jersey, which said FEMA had asked engineering firms contracted with the National Flood Insurance Program to provide it with any draft engineering reports connected to more than ...

Washington Post

Washington Post
Mon, 19 May 2014 08:53:11 -0700

Prince George's County government officials on Monday received a draft of an engineering report about a landslide that triggered evacuations of dozens of homes in Fort Washington this month. Because the document is a draft, officials said, they will ...

NJ Spotlight

NJ Spotlight
Sun, 07 Dec 2014 22:11:15 -0800

For starters, FEMA is asking insurance companies being sued to release draft engineering reports to ensure the integrity of their claims decisions. It will convene a task force to look into possible problems with payouts and the insurance companies ...
 
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