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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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2 news items

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 ...

Helena Independent Record

Helena Independent Record
Sun, 05 Oct 2014 05:00:00 -0700

About 42 percent of the geocodes contained in phase one of the city's plan are undeveloped, Alles said. A draft engineering report by Stahly Engineering figured a homeowner, on average, owns a lot that's 100 feet wide and 125 feet deep. The projected ...
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