Thread: ST3 Build 2021

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    Re: ST3 Build 2021
    #21
    Keeper of the Asylum K-fab's Avatar
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    LOL,
    My very first set of upper arms for my first ground up build we’re great. All three sets of them (was used to wadding Pilot arms whilst racing) so I was making spares to have in stock.
    Looked good, fully welded, ready to bolt on. Yeah!

    Then I tried fitting a pair and they hit the shocks. Was a very minor fix and if I had tacked, it would have been an easy correction. Lesson learned. Tack, tack, tack.
    Sand is for fast cars
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    Yellow Dog Racing
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    Re: ST3 Build 2021
    #22
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    I got some 1.5” tube to fit inside the 1.75” tube so I can butt join and plug weld the mid frame together. Is there any rule of thumb for how long the 1.5” tube should go onto the 1.75” tube. 3” on each side?
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    Re: ST3 Build 2021
    #23
    Keeper of the Asylum K-fab's Avatar
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    My stub tooobing joints (too many in the Mini...) are only 3” long overall. Once welded fully it thinks it’s one piece of tubing again anyhow.
    Sand is for fast cars
    Dirt is for fast drivers



    Yellow Dog Racing
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    Re: ST3 Build 2021
    #24
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    Got mid frame tacked together and driver hoop tacked in. this took a lot of "adjusting" notches with grinder to get bar level and a good fit still needs more, but have to be careful as i cant shorten the bar anymore or it will be narrow. If anyone has suggestions on joining a tube on a bend let me know. IMG_2725.jpg
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    Re: ST3 Build 2021
    #25
    The Wizard of Welding kustomfab2003's Avatar
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    get a paper towel roll or toilet paper roll and slip it over the tube if possible, then push against it and get the desired indentation/fit and then trace where it goes. Be sure to mark an indicator line on the tubing as well as the towel roll or assistant marking to make sure you align your marks properly afterwards. If you aren't on as much of a budget, there are some nice handy magnetic ones that the welding supply stores typically have in stock or amazon....https://www.amazon.com/PipeMaster-P-...18550364&psc=1
    Marine Veteran Sgt USMC 8151/8541 1992-2000
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    Re: ST3 Build 2021
    #26
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    thanks for the link. just bought it. got rear brace tube fit. the driver hoop tack welds look bad, may have to cut it off grind and start fresh. got pretty rough after being tacked 4 times. IMG_2726.jpg
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    Re: ST3 Build 2021
    #27
    The Wizard of Welding kustomfab2003's Avatar
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    I just sent the link to the first one I found... hopefully you got the one that matches your tube diameter :-) LOL.
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    Re: ST3 Build 2021
    #28
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    I bought 4 fresh takeoff mule pro wheels and tires. They are 4x156 bolt spacing. For the front I planned to use the Polaris trail boss idler hubs. They will need to be trimmed to fit inside the 4 wheel opening and they use a 25/32 spindle. They do have brake rotors as I want to have front brakes. Will this be strong enough. Should I start over or maybe get different bearings that will accommodate a larger spindle?

    And kustomfab yes I ordered the right tube diam.


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    Re: ST3 Build 2021
    #29
    Senior Member darwinpayne2000's Avatar
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    They should be fine for an ST3.
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