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  1. #1
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    Default How do you calculate digging force requirements?

    Is there a guideline for calculating the amount of force needed to push a digging implement into different types of soil?

  2. #2
    Veteran Member Depmandog's Avatar
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    Default

    http://www.tractorbynet.com/forums/a...out-force.html

    You might review this old thread to see if this points you in the right direction

    Good luck.
    Dean


  3. #3
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    Default Re: How do you calculate digging force requirements?

    I need the other side of the equation. How much force does it take to push an implement into the ground? I'm almost finished with a hydraulic tree spade and took it out for a test run last night. The spade uses 2" bore cylinders to push blades made from 19" diameter pipe. They dig in about a foot before the hydraulics start to bypass. I really wasn't expecting 7,000 lbs of force to be insufficient so now I need to figure out how much force it should take before I buy larger cylinders.

  4. #4
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    Default Re: How do you calculate digging force requirements?

    I can't help you, but interesting situation/ topic.

    You are getting through the topsoil, hitting the subsoil. Often (here anyhow) the subsol is hard undisturbed yellow clay, very hard to push through. Amount of moisture also makes a big difference, right now it's probably like jelly. In August, it's probably like concrete.

    Hard to get a real number, as it changes so much?

    --->Paul

  5. #5
    Veteran Member Depmandog's Avatar
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    I am pretty sure that I recall watching a program where a very large Semi mounted tree spade used water as a lubricant on the actual spades. The water was a critical part of the process. Without the water they couldn't get the depth of penetration needed.

    http://www.treeservicesmagazine.com/print-2221.aspx
    Dean


  6. #6
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    Default Re: How do you calculate digging force requirements?

    That's true. If you try to push a grounding rod in by hand, you can't do it obviously. If you do the same thing and fill the hole with water while you wiggle it, you can drive a 6' grounding rod all the way into clay by hand. I've done it!

    I'd look into using a small sprayer pump and reservoir with some perforated tubing wrapped around the tool to lubricate it.

  7. #7
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    Default Re: How do you calculate digging force requirements?

    Quote Originally Posted by swick1 View Post
    That's true. If you try to push a grounding rod in by hand, you can't do it obviously. If you do the same thing and fill the hole with water while you wiggle it, you can drive a 6' grounding rod all the way into clay by hand. I've done it!

    I'd look into using a small sprayer pump and reservoir with some perforated tubing wrapped around the tool to lubricate it.
    Sounds like a good idea to me. I don't know what you have this thing attached to, but it sounds like something needs to change or else you are going to need a REALLY heavy tractor.

  8. #8
    Elite Member Baby Grand's Avatar
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    Default Re: How do you calculate digging force requirements?

    A little vibration can help with soil penetration. I'm thinking maybe a small eccentric spinning weight attached to the digger frame. Combine that with the water spray and you might have performance that meets your expectations.
    That's the problem with trouble.
    It always starts out as such fun."
    - Randall Brown

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