There’s a Right Time to “Lay Down” on the Job


Imagine that you’re molding a simple straight-sided cup. The traditional approach is to make it in a two-part mold, with the A-side forming the outside of the cup and the B-side forming the inside. As long as both sides are suitably drafted to facilitate ejection, it’s all very simple. But add a C-handle, and it gets a little more complicated. Because the handle acts as an undercut, you’ll lay the cup on its side, form the outside with A- and B-side mold halves meeting at the handle, and use a side-action to form the inside.

So, does handle mean side-action, and no handle mean no side-action? Not necessarily. There are actually cases in which your cup (or tube or similar design) will “lay down” and require a cam even though it has no handle or other feature acting as an undercut. The good news is that you don’t actually have to decide whether a design needs to lay down for molding; our ProtoQuote® automated quote will do that for you by sending back a quote that includes a side-action even though your design has no undercuts.

Our August Protomold Injection Molding Design Tip will tell you why that might happen.

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