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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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42 news items

 
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.

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 ...

Visalia Times-Delta

Visalia Times-Delta
Wed, 05 Nov 2014 23:10:47 -0800

A draft engineering study has been completed, and Jensen estimated that water-bond money could pay for up to $20 million of the project, which has a current estimated price of $23 million. Another potential project is in East Porterville, where more ...

Helena Independent Record

Helena Independent Record
Wed, 12 Nov 2014 11:49:36 -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 ...
 
Valley morning Star
Fri, 31 Oct 2014 20:00:00 -0700

Gonzales said the county has spent about $38,000 to draft engineering and architectural plans to develop the project on the 4-acre site. “There's no reason for it to be moved,” Gonzales said. “It will cost more money. They'll have to redesign the plans.”.

DNAinfo

DNAinfo
Wed, 15 Oct 2014 05:54:16 -0700

A draft engineering report, which details the brownfield remediation work on the park property, must also be submitted by the city and will be reviewed by state officials, including the state Department of Health. After receiving final approval from ...
 
U.S. EPA.gov (press release)
Mon, 06 Oct 2014 07:37:30 -0700

... 2014) The U.S. Environmental Protection Agency (EPA) will hold a public meeting at 6:30 p.m. on Thursday, October, 9, 2014 at the Peak Creek Community Building at 7062 NC Highway 88 E, Laurel Springs, NC. to inform the public of the draft ...
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