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Old 07-26-2019, 04:54 PM
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Default Camdigger digger

My brother called me the other day. Apparently he wants me to make a toy digger for his grandson like some I made 30 years ago. Seems his grandson is obsessed with earthmoving machines. I agreed to put one together. The grandsons birthday is next month, but I told him he would have to paint it, and I need to give him time to do so. I just need a lazy susan bearing for the swivel and it is done mechanically. Probly better to paint the base before the swivel bearing goes in anyway. I plan to take it to my brother early next week.

I saw this design for sale in a magazine. The geometry of the links is such that the bucket curls automatically as the dipper crowds toward the operators station. This means that there are only two levers. I built several after I got the link geometry figured out. Gave some away, sold a few. Kept one for my kids and an extra for a pattern. Lots of kids seem to like them.
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Old 07-26-2019, 05:18 PM
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Tell that lad I have a job for him
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Old 07-26-2019, 06:51 PM
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Everyone (Cat, John Deere, New Holland) have gone to bent booms on backhoes,
even my Chinese 3-point attachment has it.

Time to get with the times.....
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Old 07-26-2019, 10:28 PM
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Quote:
Originally Posted by digger doug View Post
Everyone (Cat, John Deere, New Holland) have gone to bent booms on backhoes,
even my Chinese 3-point attachment has it.

Time to get with the times.....
Ok, so how do you go about figuring out the optimum bend in the boom? What is the advantage of the bend? Where do you bend the boom?
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Old 07-27-2019, 03:32 PM
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Oh, I could have had some fun with that as a kid. However, I could hear my Dad say once again, "Boy, you work twice as hard to give your a$$ a ride!"


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Old 07-27-2019, 03:38 PM
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The curved boom on a backhoe or excavator shifts the pivot of the boom and the stuck a little. It allows the bucket to ‘crowd’ in towards the machine farther, and by doing so, gives a stronger lifting force as well.

I’m also thinking it would make for a shorter overall machine when it’s tucked in tight, compared to a straight boom.


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Old 07-30-2019, 09:38 AM
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Here is a program that will answer that question.
It is used to design all kinds of linkage and motion.
http://blog.rectorsquid.com/linkage-update-3-7-5/
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Aaron Neville.

The virtue is always a cover for the sin. That's the key to understanding the modern left. Whatever they're accusing you of doing, they are doing themselves but more enthusiastically. And that's definitely the story of Justin Trudeau. Tucker Carlson
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Old 07-30-2019, 11:28 AM
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Quote:
Originally Posted by Ironman View Post
Here is a program that will answer that question.
It is used to design all kinds of linkage and motion.
http://blog.rectorsquid.com/linkage-update-3-7-5/
Ok , but say I want to maximize both digging depth and unloading distance, ie distance from boom pivot at 6' above ground...
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Old 07-30-2019, 12:19 PM
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Quote:
Originally Posted by greywynd View Post
The curved boom on a backhoe or excavator shifts the pivot of the boom and the stuck a little. It allows the bucket to ‘crowd’ in towards the machine farther, and by doing so, gives a stronger lifting force as well.

I’m also thinking it would make for a shorter overall machine when it’s tucked in tight, compared to a straight boom.


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It also keeps you from banging the boom on the ground in front of the ditch.....
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  #10  
Old 07-30-2019, 03:20 PM
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Quote:
Originally Posted by camdigger View Post
Ok , but say I want to maximize both digging depth and unloading distance, ie distance from boom pivot at 6' above ground...
I think the pin to pin distance would remain the same, just putting a bend in the boom about 1/3 the way up is all. Gives a more useful depth and would not affect the geometry.
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