Shop Floor Talk

Shop Floor Talk (https://www.shopfloortalk.com/forums/index.php)
-   Fabrication (https://www.shopfloortalk.com/forums/forumdisplay.php?f=13)
-   -   Camdigger digger (https://www.shopfloortalk.com/forums/showthread.php?t=51089)

camdigger 07-26-2019 04:54 PM

Camdigger digger
 
3 Attachment(s)
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.

Ironman 07-26-2019 05:18 PM

Tell that lad I have a job for him:D

digger doug 07-26-2019 06:51 PM

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.....:D

camdigger 07-26-2019 10:28 PM

Quote:

Originally Posted by digger doug (Post 739237)
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.....:D

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?

Dave Lee 07-27-2019 03:32 PM

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!":rolleyes:


Dave

greywynd 07-27-2019 03:38 PM

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.


Sent from my iPhone using ShopFloorTalk mobile app

Ironman 07-30-2019 09:38 AM

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/

camdigger 07-30-2019 11:28 AM

Quote:

Originally Posted by Ironman (Post 739410)
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...

digger doug 07-30-2019 12:19 PM

Quote:

Originally Posted by greywynd (Post 739255)
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.


Sent from my iPhone using ShopFloorTalk mobile app

It also keeps you from banging the boom on the ground in front of the ditch.....:rolleyes:

Ironman 07-30-2019 03:20 PM

Quote:

Originally Posted by camdigger (Post 739414)
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.


All times are GMT -5. The time now is 06:13 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.