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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.

2 news items

 
Pocono Record
Tue, 23 Sep 2014 04:19:10 -0700

A 2002 study outlined potential improvements, which have been updated in the latest draft engineering drawings. The I-80 West off-ramp in Tannersville — exit 299 — will be expanded to two lanes, with traffic lights for both directions where exiting ...
 
Insurance News Net
Thu, 28 Aug 2014 09:30:00 -0700

3.1.2 Engineering and Development Plan: Respondents are requested to provide draft Engineering and Development plans and assessments for engineering, developing, testing and supporting a fully developed and successfully tested Government Provided ...
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