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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.
This page uses Creative Commons Licensed content from Wikipedia. A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia.

45 news items

Asbury Park Press

Asbury Park Press
Sun, 04 Jan 2015 21:03:35 -0800

23, to the U.S. District Court of New Jersey says FEMA has directed its contracted engineering firms to provide FEMA with any draft engineering reports connected to the approximately 1,500 pending civil cases in the region within 21 days. Those drafts ...

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 ...
 
Foster's Daily Democrat
Fri, 17 Jul 2015 13:48:45 -0700

According to a draft engineering study by Underwood Engineers of Portsmouth, the project has been in planning since 2006 and will address traffic congestion and safety hazards related to the shared use of the roadways by vehicles and cyclists.
 
Al Jazeera America
Sun, 22 Feb 2015 23:44:01 -0800

Victoria Marvelli and her husband, Al Marvelli, thought they had finally made it. Just two days before Christmas in 2011, they closed on their dream home, nestled at the end of a cul-de-sac right on the water in the quiet coastal town of Seaford, New York.

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 ...

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 ...
 
Gothamist
Mon, 20 Apr 2015 14:35:03 -0700

Further, "In the last year, an in-house team of analysts at DSNY has adapted the methodology from the draft engineering report to better fit New York City's unique characteristics. That summary report will be released in conjunction with the PlaNYC ...

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 ...
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