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After collecting a few bits and pieces from the waterjet place this week i finally had enough parts to start work on making the frame jig for my next chassis. Theres a lot of work in the jig itself, i spent all weekend on it and theres still a lot to do, however the basics are now there and the headstock tube and back axle blocks are in position and everything is level.

I'd had some steel plates cut to use on the jig. I had the holes cut slightly undersize so all they needed was a bit of very light cleaning up on the mill.

I'd also had the back axle height/chain adjuster blocks cut out of 30mm thick 6082 Aluminum. they are a bit of a loose fit in the chromoly channels i had made, so I'll have to shim them out with something or have some thicker ones cut. But for now they will do for frame assembly purposes.

The back part of the jig is fixed, but the height is adjustable using the previously mentioned plates.

The end result was - level first time!

At the front of the jig i used a piece of silver steel bar the same diameter as the headstock bearings, and bored through a bit of ally bar as a pivot point. They were pressed together a hole drilled and reamed through them both.

Another set of water cut plates hold the bar in place and once tightened they hold it perfectly straight and at the correct angle.
The whole front assembly is movable to allow for adjustments in chassis length and has adjusters to get everything square..... oh and it's also movable just in case any other frames need building!