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Old 10-07-2019, 03:42 PM
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Default Farmer's Thumb

I figured that with my new addition to the fleet, The mini-X needs a opposing thumb to be more useful. I don't have a 3rd valve, and I am not in the mood to put in a flow divider and electric valve and peel off a few gallons to run a hydraulic thumb. This leaves me with building a fixed thumb. I will make it so that down the road if I have a burning need to add power to it, I can do that later.
I want the fingers of the thumb to go between the teeth of the bucket. I figured out that because the bucket has one thick ear for a bolt to anchor the pin, I will have to try to make a spacer washer and tack it in place or make the whole bushing longer and have it stick through the arm.
I've looked at a lot of pictures and this is what I came up with. Some are just a straight piece of channel with teeth cut into it. Some are curved with enough teeth to make a dentist happy. I have not figure out how I will lock it into place and keep it out of the way when I don't need it, but the general idea is to attach it up along the stick with a pin.

So I started out cutting a test piece out of scrap and found out the changes I had to make, then I dragged a piece of T1 out of the grass to make the arms.
It looked good on paper and on the computer, but it is proving to be like trying to square up wet noodles.
Think I got it done...but this stuff needs to be pre-heated even to tack it, so I got the center tooth tacked and now I think I''ll have a samwitch.
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Gerry
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Old 10-07-2019, 03:57 PM
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Did you get the emails I sent you?
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  #3  
Old 10-07-2019, 03:59 PM
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I plan to make the brace/storage bracket similar to this one, but I plan to make a longer bucket pin, and swing the thumb from the same pin as the bucket.
That pin is 30mm, or 1-3/16 in your world.
The T1 plate is an odd thickness of .407, and other than two crosspieces (made to use up some metal in the skeleton after cutting the arms) the rest of it will be rusted mild steel pieces.
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Old 10-07-2019, 05:22 PM
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Quote:
Originally Posted by milomilo View Post
Did you get the emails I sent you?
Yep, that's why the preheating. Nothing serious, have to heat 50-150 degrees, which is not a big deal. But I have had tack welds crack with this stuff in the past, and preheating solves that.
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Old 10-08-2019, 12:28 PM
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Looks good, Gerry!
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Old 10-08-2019, 04:44 PM
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Thanks Greg. Today was a dentist day....ever noticed how the less teeth you have, the more you goto the dentist?
Anyway, I was also on a quest for some cold rolled 1-3/16" shafting. Want to have that in hand when welding on the pin bosses. Metal Supermarket didn't have it but offered to bring in some 4140. I'm not sure I want to get that carried away, so I'll probably turn down some 1.125" stock.

Edit:
Got some welding done, and figured out the angle for the ears that will hold the brace.
Pictures when it cools down.
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Gerry
You got freedom of speech, if you don't say too much.
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

Last edited by Ironman; 10-08-2019 at 06:49 PM.
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  #7  
Old 10-08-2019, 07:05 PM
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Quote:
Originally Posted by Ironman View Post
...so I'll probably turn down some 1.125" stock...
I'd like to see some pictures of that!..
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Old 10-08-2019, 07:09 PM
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I think that in some parts of oilberta you just gather a bunch of chips and run the lathe in reverse
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  #9  
Old 10-08-2019, 07:15 PM
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Originally Posted by LKeithR View Post
I'd like to see some pictures of that!..
So I fatfingered it, 1-1/4" works better? it started out as 1-1/r
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Gerry
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  #10  
Old 10-09-2019, 12:32 AM
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With the skills of Jerry ,I just figured it was going to get welded up before turning down .
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