You have a cylinder made by a net shape process that is 10 mm in diameter and 60
ID: 1996832 • Letter: Y
Question
You have a cylinder made by a net shape process that is 10 mm in diameter and 60 mm long, before draft is applied. You are evaluating two options for locating the draft. The process requires 1 degree of draft. Option A) A parting line, perpendicular to the axis of the cylinder, is positioned to minimize the increase due to the draft in the two features (diameter and length). What is the maximum diameter and maximum length of the cylinder after the application of the draft? Option B) A parting line, perpendicular to the axis of the cylinder, is positioned to minimize the increase due to the draft in the two features. What is the maximum diameter and maximum length of the cylinder after the application of the draft?Explanation / Answer
Making the vertical surface of pattern into inclined is called draft allowance.
It is provided for easy removal of pattern from mould.
With out providing the draft allowance during removal of pattern untill the last point of pattern comes out from mould,there is a contact existing between pattern and the mould.Any vibrations,taking place to the human hand during removal of pattern may cause damage to the mould part.to avoid this,verical surface of of the pattern is made into inclined,as soon as the pattern is lifted by some amount immediately the gap is forming between pttern and mould all around.hence the pattern can be removed very easyly with out any damage.
In casting process,if the pattern is made by using maerials like wax,mercury,polysteryne as as pattern material,draft no need to be provided.
Coming to problem,10mm diameter,60 mm long,after providing draft,dia would be 61.04mm.length 60.0091mm.
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