Recent content by MIG

What's scary about that picture is he's standing two feet away from a cable under ten tons of tension (assuming a ten-ton bottle jack) that's simply wrapped around the top of a stump. If the chain slips off the stump, or the cable somehow breaks free, who knows what ten tons of tension will do?

Okay, I'll do that on the bigger ones. Thanks for your help.

Your comment about the perpendicular footings makes sense to me. But I have more than 200 stumps to pull. I'd rather not have to pre-dig tripod holes 200 times. Maybe if I can just use thicker steel, that would be worth it to me. I definitely agree about the safety aspect. I'm glad you take...

I used Euler's Column Formula, but I don't think I did it correctly: F = n PI^2 E I / L^2 Here is each component: n = 4: Because both ends of the column (the tripod legs) are fixed. Maybe it should be 2 because only the top of the leg is fixed? PI^2: that's just PI squared...

What does "moments contribuiting to buckling are minimized" mean? I don't know what a "moment" means in this context. I had planned to firmly attach the legs to the top plate. However, I did not give that part much thought. Would it be better, or worse, to have a more flexible joint at the...

The head of the tripod will be a triangle-shaped 1/2-inch steel plate. The winch will be bolted on top of the plate with a slot cut in the plate for the cable. I'll weld three six-inch stubs to the bottom of top plate, and then the tripod legs will fit over the stubs. If the tripod legs...

I will mostly be pulling honeysuckle stumps less than 4-5 inches in size (that's the local invasive nuisance plant). I have over 200 of them. I might try it on stumps up to 6 inches in diameter. I don't know that it will useful beyond that. The tripod will be on the soil, but the tripod feet...

WHAT: I'm designing a simple tree stump puller. It consists of a tripod made of square (or round, if it's easier) steel tubing with a winch at the top. The cable from the winch drops down, attaches to the stump, then pulls the stump upward. DIMENSIONS: The top of the tripod, where the winch...