Drawing Interpretation Question

We're having a bit of an issue discerning what exactly the draft callout on this rib is supposed to mean. You guys probably look at more drawings that anyone else who works with me so I figured I might get your take on it.

The way I'm reading it, those rib don't necessarily have to have a draft to them (+0 callout) but CAN have up to a -30 degree draft SO LONG as the minimum thickness does not go below 0.12 inches.
If this is the case, then the parts are out because the min is more like 0.06 inches.

But, maybe they mean just the base has a 0.12 min and then can get thinner as the draft tapers it down?

On the CAD model our company has, the ribs have no draft whatsoever, and a thickness of 0.12 inches.

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benj118 over 4 years ago

Unable to make out the drawing for sure, comes through a little out of focus. The minus 30 looks like minutes/seconds instead of °?
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ajlee7 over 4 years ago

It is 30' so half a degree. The drawing is a digital copy they sent me and it's out of focus as well.

The only thing I'm concerned about is the order that the dimension is listed in. Since the min is listed first and then the draft angle second, does that mean as long as the root of the rib is in spec it's fine?
Or would the min thickness still apply after the draft is taken into account?

The design engineer is saying that the min should apply at all times even after the draft, but I'm not so sure that's what's being conveyed to the manufacturer.
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derekvegeta over 4 years ago

My Interpretation: In agreement with your design engineer for the .120" Min, at no point (no matter the draft) do they want the width to fall below .120". They allow upto a half degree of a taper/draft per 'side'. I'm assuming its per side of the slot itself as I see no other side (however our view of the print is limited so they could be trying to reference an opposing feature on the other side of the part when they say 'side')
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