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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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43 news items

Helena Independent Record

Helena Independent Record
Thu, 18 Dec 2014 12:26:15 -0800

With average lots of 100 feet wide and 125 feet deep, according to a draft engineering report by Stahly Engineering, new buildings would not be suitable for well and septic systems. When existing sewer systems fail they would also require city services.

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 ...
 
San Diego Source (subscription)
Sat, 06 Dec 2014 05:07:30 -0800

The lawmakers announced today 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.
 
Santa Rosa Press Democrat
Tue, 02 Dec 2014 16:00:00 -0800

Sonoma County supervisors on Tuesday approved a trio of actions aimed at improving dental health in Sonoma County, including a contract to complete a study on fluoridation of the county's drinking water. The draft engineering study, which includes a ...

Helena Independent Record

Helena Independent Record
Sat, 22 Nov 2014 21:03:33 -0800

According to a draft engineering report by Stahly Engineering, a homeowner on average owns a lot that's 100 feet wide and 125 feet deep. The projected cost for water service would be $1.10 per square foot and an additional 75 cents per square foot for ...

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 ...
 
West Virginia MetroNews
Fri, 14 Nov 2014 10:57:30 -0800

“These competitions and these challenges can take them all the way through their childhood,” said Melissa Thompson, associate professor of civil and draft engineering technology at BridgeValley Community and Technical College in Fayette County.
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