welding steel base or just getting aluminium extrusion

[Boyan Silyavski]

Do not try to make all like 2000mm, for example. make it 2003mm but parallel and square. Hence you don't need the pieces to be super precisely cut. You will definitely need a box of washers though, to fill the cracks. Remember that your final epoxy cast below rails will be 40mm wide, and rails are 20mm wide. The ???what was the name of it, the epoxy that lifted to the sides due to attraction will be 3-4mm each side, so basically you will be able to position the rails within that margin of the rest 10mm. hence do the gantry when you have finished and measured your final base frame, not at the same time.

And as you have been told, not bigger stitches than 2 inch at a time and place, and no higher overall temp of the beam than 60C. When you reach that temp, leave to cool before continue.

You will be tempted to hurry, but take your time and do it properly, you are not welding a typical welders job. I would go as far as to say that i will not trust a normal welder to do that job, as the moment i turn my back he will make 2 meter stitch

PS. best is to use hard stop ruler or a contraption to make all exact same distance