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Thread: Shear

  1. #1
    rossbotics rossbotics's Avatar
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    Shear

    I’ve had the idea of making a hand shear for a while, it’s not something I will use on a regular basis in the machine shop but it will indeed come in handy from time to time, instead of sawing everything now I can shear allot of it, it will cut straight lines and radiuses on mild steel up to 1/8” in thickness, it will cut 6” in width but could be made to cut wider, 6” will work just fine for me.

    The upper and lower frames were constructed from 3/4” A-36 steel plate, the blades were fabricated from A-2 tool steel hardened tempered and ground, the lever and linkages were made from 4140 steel hardened and tempered, the handle was fabricated from 3/4” schedule 40 pipe, all assembly bolts are socket head cap screws, the shear is mounted onto a heavy wooden work bench for rigidity.

    Mild steel would work for the construction of everything except the blades, using mild steel for the linkages and levers would soon wear out due to the force it takes to shear metal, using a heat treated alloy steel for these parts greatly lengthens the life of the tool, all pivot points use 1/2“modified shoulder bolts, shoulder bolts are heat treated and ground round and fit nicely into the reamed holes, there are a variety of metals the blades can be made from such as A-2, D-2, H-13, S-7, HSS and a few others.

    The shear was designed to last for many years, it was designed with close fits and tight tolerances, the blades can be resharpened many times over.

    Below you will find some photos of the construction and a few examples of the shear being used, hope this will be helpful.

    As always thanks for looking
    And Happy Machining

    Doug



    Shear-1.jpg

    Machining the plates

    Shear-4.jpg

    Tapping all the holes

    Shear-5.jpg

    Making the blades

    Shear-7.jpg

    Modifying the shoulder bolts using the carbide threading tool holder and extended point live center I previously made

    Shear-8.jpg

    All parts made and ready to assemble

    Shear-9.jpg

    Testing the shear

    Shear-12.jpg

    Example of cuts

    Shear-13.jpg

    Straight shearing

    Shear-14.jpg

    End view

    Shear-15.jpg

    Shearing

    Shear-16.jpg

    Overall view
    Comments are always welcome
    Doug



    Tool Plans for Sale by rossbotics




  2. The Following 12 Users Say Thank You to rossbotics For This Useful Post:

    bukwessul (03-01-2018), Carlos B (06-27-2017), Gary A. Wills (03-15-2018), LMMasterMariner (06-27-2017), olderdan (06-27-2017), Paul Jones (06-27-2017), rlm98253 (06-27-2017), Seedtick (06-27-2017), stainless stål (06-29-2017), StephenL (08-03-2017), Tuomas (06-27-2017), Vyacheslav.Nevolya (06-30-2017)

  3. #2
    Soikkeli Tuomas's Avatar
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    Great work! I want to try to make one!

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    rossbotics (06-30-2017)

  5. #3
    olderdan's Avatar
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    Great clean way to cut sheet metal in such a nice workshop, superb work as ever.

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    rossbotics (06-30-2017)

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    Very precisely made of well-chosen materials. Excellent job. I would also like to have this useful tool but unfortunately there is no place for it in my workshop.

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    rossbotics (06-30-2017)

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    Carlos B's Avatar
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    I have cheap 8 and 12" imports but they don't shine a light on your build, well designed and very well built.
    From a popular rap: "If time is money then I need a loan."
    Carlos B, http://www.hobbyworkshopprojects.com/

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    rossbotics (06-30-2017)

  11. #6
    Content Editor DIYer's Avatar
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    Thanks rossbotics! We've added your Shear to our Metalworking category,
    as well as to your builder page: rossbotics's Homemade Tools. Your receipt:




  12. #7
    mr95gst's Avatar
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    You got my vote for tool of the week!

  13. The Following User Says Thank You to mr95gst For This Useful Post:

    rossbotics (06-30-2017)

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    LMMasterMariner's Avatar
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    My vote too.

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    Nice tool & workmanship. Any chance you could supply a blueprint for others to follow to build one like this ?

  17. #10
    rossbotics rossbotics's Avatar
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    Thanks mdhatter3
    I have submitted cad drawings, photos, bill of materials and all documentation to build this tool to Jon the administrator, he is reviewing everything to make sure it's all complete and satisfactory, he will then post the drawings for download.

    Thank You

    Doug
    Last edited by rossbotics; 06-30-2017 at 01:48 AM.
    Comments are always welcome
    Doug



    Tool Plans for Sale by rossbotics




  18. The Following User Says Thank You to rossbotics For This Useful Post:

    olderdan (06-30-2017)

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