The DIY frame jig thread

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  • Thank you! The plates are pieces of 10mm (or 3/8") thick aluminium - I've designed the fixture around available sizes so there shouldn't be too much involved in getting stuff to fit.

    The axle is free to move back and down when you undo the fixing screw - so the frame is can pivot around the BB. Or I can release the QR clamps holding the dummy axle support and it'll slide up out of the way if I want to keep the frame in place.

    Good tip on bikecad - I haven't used it for a few years so it's nice to know I can get that info from there. I plan on modelling the frames in Fusion 360 before making anything anyway, so I can extract those numbers pretty easily anyway.

  • so the frame is can pivot around the BB

    I have found this hard to achieve in reality because the headtube pinches the the head tube holder (worse after tacking) and doesnt want to release in the arc that pivoting around the bb allows. Because the headtube wants to come off perpendicular to the holder, but can only move along an arc. However it depends on how close a fit you have that head tube holder inside the headtube.

  • That's a very good point. I'll start with the head tube puck as a close fit to the HT but I can always turn it down or modify it done other way to fit better.

  • Making some progress. Got it to the point where I can start to measure how far out of plane things are and make adjustments. Need to come up with some guides for the sliding elements too, as there's too much play in then.

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    • PXL_20211211_134358520.jpg
  • cool, looks great

  • I'm going to use this thread for shameless self promoting. Clamps and tube holders are essential part of frame and rack building. I'm going to make a batch of these and taking pre-orders now.





    Here’s the deets and specs:
    Spring loaded design for easy operating with one hand
    Width 150 mm
    For 10-22.2 mm tubes*
    5 mm blackened steel plates, stainless steel alignment pins and compression spring
    Steel thumb screw (standard) / locking lever (upgrade)
    Adjustable stainless steel knobs w/ knurled steel nuts

    I’m taking pre-orders now till end of the month. Price for one tool is 42€, a set of three is 120€ and the ultimate rack builders special set which contains six clamps is 230€. If you prefer more locking lever over thumb screw your can upgrade your clamp. Just add +6€ for the price of each clamp. There’s two colors where to choose from: black and orange lever.

    To place your order send me an email info at kongabicycles dot com or DM on Instagram (kongabicycles). Include your shipping details and email address on your message. Delivery of clamps will start in 2-4 weeks.

    *Can be used with smaller tubes by removing the spring.

  • Finally finished my fixture. There's a bit of a twist in the rear axle mount that I need to shim out but everything else lines up and moves as it should.

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    • PXL_20220919_103052704-01.jpeg
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The DIY frame jig thread

Posted by Avatar for M_V @M_V