Thanks for the Info Bob & DC.
You are probably right on the 2 x 4 wood type. I just assumed they were white pine, but like you said, you learn something new everyday, if your not careful. Learning is one of the best things about being on the "top side" of dirt, and one of the best things about getting older. lol
Bob, Ill pass on trying the beach wood for now. After my lack of success with the fir hearth board, and a failed attempt this morning, my tail is now between my legs, and my paws are sore.
On this mornings failed attempt, I tried a new horse weed spindle that I collected on last night's hunt. This piece of horse weed was taller and lighter than ones I collected earlier this year. I also noticed that the pithy core was much larger. That ratio of pithy core to harder outer shell seems to make a difference in getting an ember. It seems like on a 5/16" dia spindle, if you have a core of more than 1/8" dia, it may be too soft.
It was easy to get make dust and get smoke, but because the core was so soft, the spindle and white cedar hearth board would turn into dust before it got hot enough for an ember. This could also be a case where I tried to rush it, and applied to much pressure, not sure.
I'm almost certain that a person with better techniques than me, may have gotten an ember. I will post some pics later showing the end grain of a spindle that worked good, and one that failed. Let me know if you have ever noticed the same thing.
What's great about this thread is collectively we are identifying many of the variables, and details that account for success and failure. We're eliminating some of the "black magic" of making a friction fire. Good stuff!
Enjoy your day!
Ed