Kneejerk Bombas
ArboristSite King
- Joined
- Oct 7, 2001
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Lowering device.
Let's talk a little about the loads.
Just for example, I envision using this this on logs 6' long maybe 30" diameter, so we are talking around 1800 lb.s, right?
Say those straps are similar to the straps on a Hobbs or GRCS. Each of those is rated at over 20,000 lbs., so in fact they could be a lighter duty version, maybe 2000 lb.s SWL(5 to 1) each.
A couple folks recommend a titaninum alloy, I was thinking steel. It would be raised and attached in two seperate pieces so that makes the weight less of a factor.
If the movement is slow, from top to bottom, the loads don't appear to get much greater than the log weight. What method to use to slow the movement as the log swings down, that's the question.
One thought I had, was using a disc brake on the axle of the device. You could even have a little remote control with a hand lever.
You could set the brake, make the cut, put away your saw, and the piece would be held in place until the brake is realesed. Then as the piece is tipped over, variable brake pressure could control the decent.
Let's talk a little about the loads.
Just for example, I envision using this this on logs 6' long maybe 30" diameter, so we are talking around 1800 lb.s, right?
Say those straps are similar to the straps on a Hobbs or GRCS. Each of those is rated at over 20,000 lbs., so in fact they could be a lighter duty version, maybe 2000 lb.s SWL(5 to 1) each.
A couple folks recommend a titaninum alloy, I was thinking steel. It would be raised and attached in two seperate pieces so that makes the weight less of a factor.
If the movement is slow, from top to bottom, the loads don't appear to get much greater than the log weight. What method to use to slow the movement as the log swings down, that's the question.
One thought I had, was using a disc brake on the axle of the device. You could even have a little remote control with a hand lever.
You could set the brake, make the cut, put away your saw, and the piece would be held in place until the brake is realesed. Then as the piece is tipped over, variable brake pressure could control the decent.