75x50x3 mm rectangular hollow section (RHS) for the side beams and draw bar. Its part of the HSS (hollow structural section) steel family.
Will try out 75x40x4mm galvanized C- channel with parallel flanges for the cross beams (no black available) - this looks about the right strength and welding 4mm (channel) to 3mm (RHS) thicknesses together should be ok. It was hard to find in suppliers stock in Townsville.
Bought 8m of "heavy" C - channel 75x40 with (4-6mm walls)
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| Leveling the new frames steel RHS |
Used the old frame as a template. Had to level up the new frame over the old bent one on blocks of wood, steel etc. Don't have a large enough flat concrete slab on site which would be an easier, more accurate surface to build on as this would be a better option if available.
There was some distortion/ building errors in the old frame eg. Its rear side beams were not parallel, 1cm different at the back to the front. (and it had a reverse camber bow developed).
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