Parting of Moulded Parts Adapted from: .
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Transcript of Parting of Moulded Parts Adapted from: .
Parting of Moulded Parts
Adapted from: http://www.solidworks.com/swexpress/april/200204_techtip_02.cfm
What is the different between this two chairs?
“Solid”stool by Patrick JouinChair One by Konstantin Grcic for Magis
Design optimised for moulding
Design optimised for layered-manufacturing
Design for Manufacturing
Zero draftimpossible to de-mould
Draft addedeasy to de-mould
form compromised
Change direction of pull or no. of parts
easy to de-mould but more complicated
Discussion
What is the general rule for product parting design?
Design the form as a blob
Try to find out a de-mouldable
direction of pull
Define direction of pull and part-
line
Resulting part-line too costly or risky
to make!
Divide problematic form to more parts
Number of parts exceed budget!
Add draft by modify the form
Form looks bad!Modify the form
Product Design Considerations
There is always a trade-off between aesthetics, design considerations, and mouldability
Designer can only assure authenticity by taking drafting and parting decision in his own hand
Current main-stream CAD application can only perform automatic draft operation on straight-up side walls
For curved or double-curvature side walls draft feature must be place in the model early on