Just came across this site that has some real good info on it including this about making a bow drill and "reading" the dust including colour pics
http://wildwoodsurvival.com/survival/fire/bowdrill/pmoc/basicbowdrill.html
Thought I'd share
[TABLE="width: 100%"]
[TR]
[TD="width: 24%"]Colour
[/TD]
[TD="width: 19%"]Consistency
[/TD]
[TD="width: 61%"]Problem
[/TD]
[/TR]
[TR]
[TD="width: 24%"]Light Brown
[/TD]
[TD="width: 19%"]Dusty
[/TD]
[TD="width: 61%"]Going too slow, not pushing down hard enough
[/TD]
[/TR]
[TR]
[TD="width: 24%"]Light Brown
[/TD]
[TD="width: 19%"]Fuzzy
[/TD]
[TD="width: 61%"]Going too slowly
[/TD]
[/TR]
[TR]
[TD="width: 24%"]Dark Brown/Black
[/TD]
[TD="width: 19%"]Fuzzy
[/TD]
[TD="width: 61%"]Perfect
[/TD]
[/TR]
[TR]
[TD="width: 24%"]Dark Brown/Black
[/TD]
[TD="width: 19%"]Little Rolls
[/TD]
[TD="width: 61%"]Difficult, sometimes going too fast & not pushing down enough
[/TD]
[/TR]
[TR]
[TD="width: 24%"]Dark Brown/Black
[/TD]
[TD="width: 19%"]Crusty
[/TD]
[TD="width: 61%"]Pushing down too hard, going too fast
[/TD]
[/TR]
[/TABLE]
http://wildwoodsurvival.com/survival/fire/bowdrill/pmoc/basicbowdrill.html
Thought I'd share
[TABLE="width: 100%"]
[TR]
[TD="width: 24%"]Colour
[/TD]
[TD="width: 19%"]Consistency
[/TD]
[TD="width: 61%"]Problem
[/TD]
[/TR]
[TR]
[TD="width: 24%"]Light Brown
[/TD]
[TD="width: 19%"]Dusty
[/TD]
[TD="width: 61%"]Going too slow, not pushing down hard enough
[/TD]
[/TR]
[TR]
[TD="width: 24%"]Light Brown
[/TD]
[TD="width: 19%"]Fuzzy
[/TD]
[TD="width: 61%"]Going too slowly
[/TD]
[/TR]
[TR]
[TD="width: 24%"]Dark Brown/Black
[/TD]
[TD="width: 19%"]Fuzzy
[/TD]
[TD="width: 61%"]Perfect
[/TD]
[/TR]
[TR]
[TD="width: 24%"]Dark Brown/Black
[/TD]
[TD="width: 19%"]Little Rolls
[/TD]
[TD="width: 61%"]Difficult, sometimes going too fast & not pushing down enough
[/TD]
[/TR]
[TR]
[TD="width: 24%"]Dark Brown/Black
[/TD]
[TD="width: 19%"]Crusty
[/TD]
[TD="width: 61%"]Pushing down too hard, going too fast
[/TD]
[/TR]
[/TABLE]