Posted by eric1 on January 11, 2008 at 08:54:13 from (75.197.36.228):
In Reply to: tree pusher posted by Sam in WA on January 09, 2008 at 20:17:06:
You should be able to weld up a decent pusher bar without resorting to a full blown engineering analysis. If you're bending the bars you already have made, then obviously that indicates you either need thicker wall tubing and/or larger diameter tubing and/or better bracing and/or you're abusing them. I also think the suggestion chris made about filling the tube that's getting bent with concrete is a good one. This will stiffen the tube and make it much less likely to "bifurcate" or bend and fold under side loads. Lastly, of course when you've got the kind of power that a D8 can deliver you obviously have to use the bar properly or it's going to get bent. Any machine, or accessory (like a pusher bar) no matter how heavily built can be pranged if its not used properly or is abused. Take your time and square up on the tree accurately before *smoothly* putting the power to it. Finesse the blade elevation and yaw of the machine as power is applied and the tree starts to go over. Ensure the pushing force stays in line with the axis of the bar and without creating excessive side or vertical loading.
Above is a pic of a modern pusher bar. Note that it has teeth that dig into the tree. This keeps it from slipping up the trunk of the tree as you put power to it (otherwise which could also contribute to bending).
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