The DIY frame jig thread

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  • Messed about with my jig a bit tonight and thought we should have a thread for people to post their successes and failures and DIY jig building.

    This is what I started with,

    The uprights weren't very secure and went out of adjustment very easily. I think @biggles had this issue with his jig too.

    The bottom bracket also gets in the way of the mount for the seattube upright and the rear axle was the fixed point so if I set it up then wanted to adjust chainstay length it mean moving everything (and it inevitaby going out of adjustment as I moved it...) and because of the weight of the uprights I'd been horsing down on the bolts that hold the pivot blocks to the base and the t nuts had chewed up the channels in the extrusion a bit making adjusting it pretty difficult.

    All I'd had to make for that though was the pivots for the uprights (cuboidal blocks of ali drilled a few times and faced to be square on the lathe,'cones' for the head and seattubes which I just did stepped rather than tapered as the lathe I have access to has a terrible compound slide and the axle holder which was again just a drilled and faced block of ali.

    Cost of that jig was around £100 I think, main costs being 1x 1m length of 2080 and 2x 750mm lengths of 2060 extrusion.

    This is what I've come up with tonight,

    I can now adjust front and back end geometry independently and (I think) the frame will come in and out of the jig more easily now.

    Also added a little mount to the back so I can hold the jig in my workstand as well as the vice.

    This design uses only 1 of the 750mm bits of 2060 so would actually be cheaper than the original iteration.

    Who else has a home made jig to show off?

  • good work, it looks more thought out than the first one and arranged more like a pro jig.

    I have a pile of extrusion and some lathed up parts so far. nothing to be proud of yet

  • Are you using 20 series extrusion or bigger stuff?

    I think most of the hogs I’ve looked at use bigger stuff but there’s not so much available on eBay for the larger sizes.

  • I bought all my alu extrusions and bits from KJN. They are basically a copy of Bosch profiles and quality seems great.
    And it wasn't very expensive.

  • im not sure of the series as I bought it secondhand but its bigger than 20, I think 50mm section. its going to weigh about 30kg when done, a lot heavier than I ever expected. not a bad thing though.

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The DIY frame jig thread

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