a perfect 90deg joint - 15mm Alu

[dsc]

Hi Mark,

I can add two more bolt holes like here:



Still not sure about the slot, even with out, I doubt I'll get more play in case of other errors, as the four bolt holes will have to align leaving maybe a few 0.01mm of play here and there (although I won't be able to move much if I need to anyway due to the amount of holes involved). As you say, I can always add supports later if I need to.

Also, I've checked and the total static load will be around the 1kg mark, not 2kg like I thought before. I'm pretty sure four M6 bolts can handle 1kg, so it's basically a matter of machining the parts correctly to get 90degs everywhere.

Regards,
dsc.