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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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58 news items

Asbury Park Press

Asbury Park Press
Fri, 20 Feb 2015 12:59:24 -0800

The Asbury Park Press wrote about the existence of draft engineering reports after they first became public — during a hearing in Brown's courtroom in October. An attorney for a Long Beach, N.Y., couple who were suing over their flood insurance payout ...
Wed, 18 Feb 2015 16:22:27 -0800

Last November, allegations that reports were doctored led Judge Gary R. Brown of the federal court in Brooklyn to order draft engineering reports to be turned over in more than 1,000 separate Sandy-related lawsuits, writing that the practice could be ...
Tue, 17 Feb 2015 06:15:00 -0800

Pursuant to the CD and CAP, we submitted a draft engineering design report (EDR) to DOE in November 2014, followed by supplemental appendices in December, detailing the proposed design of the Port Gamble Bay sediment clean-up project.

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

Although Judge Brown's decision applied only to Long Island and parts of New York City, Fugate asked Write Your Own companies in all Sandy-affected areas -- including New Jersey -- to release all internal, draft engineering reports to policyholders ...


Fri, 05 Dec 2014 17:41:15 -0800

The lawmakers announced yesterday that FEMA will be taking steps to improve flood claims handling, including examining incentives under the program with private companies and urging them to make draft engineering reports available to policy holders.

Cherry Hill Courier Post

Cherry Hill Courier Post
Fri, 05 Dec 2014 16:56:15 -0800

A Friday letter from FEMA administrator Craig Fugate to insurers that write policies through the National Flood Insurance Program instructs them to produce these draft engineering reports in all Sandy cases so they can provide a copy to policyholders.

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