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drawing a widening spiral

kevin_mason558kevin_mason558 Member Posts: 5 EDU
ive only started learning CAD and im using inspiration from work products to practise drawing for myself. i have been following a few videos online and reading others questions. 
im currently looking at feeder wagon augers, these are spiralled chutes that narrow toward the top, i have attempted to draw this below. but i do not know how to make a spiral widen at the bottom to meet the shaft,  is this possible?
many thanks 
kevin

https://cad.onshape.com/documents/0a3a85d54ac87d5e0903251f/w/d9ba5a11bdd5b93db63d9243/e/505c582a9f6256666aa8b79b?renderMode=0&uiState=626d48afb2b1db7e3a3b5150

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