this is not mine got from another member (randyg)
I started this year and it works awesome
as far as cleanup how long going to take you to do it 1 hr @ $50/hr and double it. Now if I could take my own advice
A 20 inch stump has 4 times more surface area (square inches) than a 10 inch stump.
A 40 inch stump has 4 times more surface area than a 20 inch.
An 80 inch stump 4 times the area of a 40.
:monkey:
Since you are grinding the ENTIRE surface of the stump, and NOT JUST ONE PASS across the widest part, why not measure the "area" and multiply that "area" by your $ figure?
HOW??? Thought you'd never ask. Pi = 3.1416 You'll have to trust me on that. You measure the distance across the stump as usual, and that is the "diameter". Divide the "diameter" in half, to get the "radius". {We're almost there} Now multiply the radius times the radius, and then multiply that answer times Pi and you have found the area. That can be expressed in "square inches" or "square centimeters" if you wish.
OK We have a stump 20 inches across. One half of that is 10. 10 times 10 equals 100. 100 times 3.1416 equals 314.16 right? Drop the (.16) and you have a surface area of 314 sq.in. (square inches)
How about a 30 inch stump? One half of 30 is 15. 15 times 15 equals 225. 225 times 3.1416 equals 706.86. Round up to 707 square inches.
Now if you use a figure like say, 15 cents per sq.in. that 20 inch stump comes out to just under 50 bucks, and the 30 incher is just over a hundred.
Never again will you be able to say "not sure why, but is seems that the bigger the stump, the more money I loose".
If you have rotten center, you can subtract that rotten area from total area easy enough right? OK Just 2 more things.
1. When grinding stumps, "the deader the better".
2. "People who understand MATH don't buy lottery tickets".