Backhoe thumb
- Thread starter mboulais
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kthompson
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Sorry if I am raining on your project and my questions may not be accurate just looking at picture and by no means a thumb expert.
But, is it only bolted on? Did you do something to spread out the stress on the top and bottom of the boom where it is bolted on? It looks a little short, have been told you want the thumb to be longer (at least as long) as the bucket teeth when it reaches the thumb. I have used a thumb a good bit with logging debris on 10,000 pound excavator is my total experience and my concerns may not be valid. But...you certainly don't want to damage a boom section as I have known of being done with a bolt on design by someone on ebay and for certain you don't want there to be a failure when any load lifted.
A thumb is very very handle for many lifting jobs.
But, is it only bolted on? Did you do something to spread out the stress on the top and bottom of the boom where it is bolted on? It looks a little short, have been told you want the thumb to be longer (at least as long) as the bucket teeth when it reaches the thumb. I have used a thumb a good bit with logging debris on 10,000 pound excavator is my total experience and my concerns may not be valid. But...you certainly don't want to damage a boom section as I have known of being done with a bolt on design by someone on ebay and for certain you don't want there to be a failure when any load lifted.
A thumb is very very handle for many lifting jobs.
Yes it is bolted on,Through bolted actually. I am not sure what failure you are expecting. The tube backhoe frame is thin, but the load is near the sidewalls of the tube and most of the force will go into those sidewalls. The plates that for the outside members of the backhoe will handle bending stress as easily as if you were pinching a rock between the bucket and arm.
I think you are a good son. Looks nice. Actually it looks like a computer rendering.
two_bit_score
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WOW- JD decals and all?
kthompson
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As I said I am not an expert, hope my concerns prove all false. A lot will depend on load it is subject to of course.
JoelD
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Looks nice.
Yes, appears a little short, I've got a thumb on my backhoe and I purchased a little small and it is about 4-5 inches short of the bucket teeth. The only difference is you need to get down under logs and the like to pick up. When the thumb meets the bucket teeth you can surgically pick up, without needing to get under. I may ultimately extend mine, but in the mean time it works just fine.
Joel
Yes, appears a little short, I've got a thumb on my backhoe and I purchased a little small and it is about 4-5 inches short of the bucket teeth. The only difference is you need to get down under logs and the like to pick up. When the thumb meets the bucket teeth you can surgically pick up, without needing to get under. I may ultimately extend mine, but in the mean time it works just fine.
Joel
Thanks all.
Yes, JD Decals and all. Those decals cost more than the money. They were on my desk at work and coworkers who know my preference for red tractors spotted them.
It's real, I edited the photo to highlight it and blur the background.
Actually it fits right around the center point. Sorry, no fancy photo manipulation this time.
Yes, JD Decals and all. Those decals cost more than the money. They were on my desk at work and coworkers who know my preference for red tractors spotted them.
It's real, I edited the photo to highlight it and blur the background.
Actually it fits right around the center point. Sorry, no fancy photo manipulation this time.
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It probably won't get loaded too heavy, It's on a small backhoe behind a JD790. Besides He has an awesome warranty.
the reason thumbs are usually longer is that when the boom is fully extended the thumb can reach around the object allowing the bucket to swing in without scooping up dirt my guess is that , this set up may pull some divets, and I have to agree about through bolting ,it is a little sketchy a small rock will peel it right off , also it may split right at the teeth nothces , I am not trying to rain on your parade either but I have built quite a few thumbs. just friendly advice,saying it wont be overloaded is well you know..