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Thread: Shrinker Stretcher

  1. #11
    Supporting Member Charst's Avatar
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    Charst's Tools
    Thank you DIYer

    Charst

  2. #12
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    Thatís awesome. Eckold jaws are expensive but they are probably the best. The function of eckold at a lot less expense. Looks better also. Could be fun to make this into a steampunk looking tool also.

  3. #13

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    excellent

    Hello charst, incredible team that you designed, please let me know to do it for my workshop and I want to know if it is possible to obtain the information of plans and measurements and where you got the Eckolds, sorry my English is quite bad and I use a translator since I only speak Spanish

    Thank you

    Juan Alberto

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    stunning looking piece of kit

    i too would be interested in drawings etc. if you would be so kind.
    [email protected]-thanks in advance

  5. #15
    Jon
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    Congratulations Charst - your Shrinker/Stretcher is the Homemade Tool of the Week!

    Nice follow-through; it was good to see this build from design through to completion.

    Some more good builds from this week:

    Hot Wire Cutter by Kovanca Polock
    Hydraulic Cylinder Machining Fixture by Frank S
    Tool Holder by celsoari
    Marking Gauge by Mazay
    Track Saw Guide by Didpoolhall
    PID Controller by JKeetonKnives
    Wood Stove Log Grate by Frank S
    Lathe Tailstock by Es Welding
    Drill Press XY Table by mariost
    Rollers by thehomeengineer
    Tube and Pipe Drilling Jig by Kwandotechnic
    Router Biscuit Joiner Attachment by shopandmath
    Octopus Jig by Christofix
    Welding Fixture by Kwandotechnic
    Drum Sander Feed Mechanism by RCTURKA
    Flat Bar Twister by Kwandotechnic



    Charst - we've added your tool entry to our All Homemade Tool of the Week winners post. And, you'll now notice the wrench-on-pedestal award in the awards showcase in your postbit, visible beneath your username:



    You'll be receiving a $25 online gift card, in your choice of Amazon, PayPal, or bitcoin. Please PM me your current email address and award choice and I'll get it sent over right away.

    Nice work!
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  6. #16
    Supporting Member Charst's Avatar
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    Charst's Tools
    Hi again,

    I have made a small demo video of my shrinker-stretcher. Just follow the link...


  7. The Following 4 Users Say Thank You to Charst For This Useful Post:

    bimmer1980 (10-16-2019), Jon (10-16-2019), KustomsbyKent (10-21-2019), mwmkravchenko (10-18-2019)

  8. #17
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    wizard69's Tools
    Wow! Very nice build, certainly deserves tool of the week!

    Your design is very interesting, I’d like to ask a question or two.

    First; why the cam action? Is it to magnify pressure.

    Second; is the cam a hardened piece of steel?


    Pretty neAt machine. Maybe in the future I will build something like it. Too many in process builds at the moment to start another one.

  9. #18
    Supporting Member Charst's Avatar
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    Charst's Tools
    Quote Originally Posted by wizard69 View Post
    Wow! Very nice build, certainly deserves tool of the week!

    Your design is very interesting, I’d like to ask a question or two.

    First; why the cam action? Is it to magnify pressure.

    Second; is the cam a hardened piece of steel?


    Pretty neAt machine. Maybe in the future I will build something like it. Too many in process builds at the moment to start another one.
    Hi Wizard

    Answer 1: The membrane cylinder alone gives 5kN and abt. 70mm of movement. The cam together with the lever ratio on the arms give me abt. 30-35kN and abt. 10mm movement on the tools. So yes, the cam magnifies the forces (Cam ratio is 3,5:1)

    Answer 2: The material of the cam is the only weak point so far. It is made of mild steel (S235). The material starts to deform in the area of the highest load on the cam. However it is not that bad. But next time I'll be using C45E or better.

    Cheers

    Charst

  10. #19
    Supporting Member bimmer1980's Avatar
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    bimmer1980's Tools
    Very nicely done! It's great to see it in action. I found it interesting to see how much the frame deflects when it is putting pressure on the material to stretch or shrink. As heavy duty as the design and built, it generates a lot of force!!

    What do you plan to make with it? I see a motorcycle in the background......

  11. #20
    Supporting Member Charst's Avatar
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    Charst's Tools
    Yes 7.800 pounds is quite something... but it's within the permissible yield strength.
    I am mainly using it for bodywork on motorcycles or artwork (see pic)

    Cheers

    Charst

    Shrinker Stretcher-1.jpg

    Shrinker Stretcher-seat.jpg

    Shrinker Stretcher-5.jpg


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  12. The Following User Says Thank You to Charst For This Useful Post:

    Tooler2 (10-18-2019)

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