jimgerken
Veteran Member
"Jimgerken; thanks for the pics of your grubber. I'm planning on making one similar to yours. It's always a help to see what others have come up with. Only difference I will turn the drawbar the other way so the flat is vertical. It will be stronger that way."
Bikerdib: Took me a minute to understand the drawbar comment, but it did dawn on me eventually what you were saying. It's been a while since I built this deal, and I did re-think my design just now based on your comment. But I am standing by the design as-built. Here's why -- When using it, the main action you perform is backing up to capture and extract the tree. If you were to back up until the tree was firmly engaged into the scissors like edge, then stop and lift, the tree would (does) tear out and stay standing. However that is not the way it is done. Instead, you keep backing up to tear the tree out of the ground. Once it is torn out, you lift and keep backing up to keep the clamping pressure on it as the last few roots tear. Then you can drive forward, possibly lowering it to the ground so the root drags on the ground, and maybe it falls out of the jaws, or you have to get off and pull it out. So you see the majority of the force is horizontal. That's why the drawbar is oriented as shown, horizontal.
Thanks for the question though...
Bikerdib: Took me a minute to understand the drawbar comment, but it did dawn on me eventually what you were saying. It's been a while since I built this deal, and I did re-think my design just now based on your comment. But I am standing by the design as-built. Here's why -- When using it, the main action you perform is backing up to capture and extract the tree. If you were to back up until the tree was firmly engaged into the scissors like edge, then stop and lift, the tree would (does) tear out and stay standing. However that is not the way it is done. Instead, you keep backing up to tear the tree out of the ground. Once it is torn out, you lift and keep backing up to keep the clamping pressure on it as the last few roots tear. Then you can drive forward, possibly lowering it to the ground so the root drags on the ground, and maybe it falls out of the jaws, or you have to get off and pull it out. So you see the majority of the force is horizontal. That's why the drawbar is oriented as shown, horizontal.
Thanks for the question though...