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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.
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52 news items

Peninsula Daily

Peninsula Daily
Fri, 10 Apr 2015 00:41:18 -0700

August: Draft engineering design report to be completed 60 days after the cleanup action plan is finalized. □ October: Finalize the engineering design report. □ March 2016: Start cleanup within 120 days of approval of the engineering design ...

eCoronado.com (blog)

eCoronado.com (blog)
Wed, 25 Mar 2015 12:02:27 -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].

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 ...

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 ...

Asbury Park Press

Asbury Park Press
Fri, 20 Feb 2015 12:48:45 -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 ...
 
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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.
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