22-10-2012, 05:43 AM
If they are plastic props you want to take a bit of the rake angle off the drill so they don't grab and do a helicopter on you. Can be a bit of a nasty suprise. It also happens when you drill things like brass, and it's especially bad when your opening up an existing hole
Here's a link with a pic
http://www.listoftools.com/grinding_oper...brass.html
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