Fingers crossed it'll cut ally

[Jonathan]

i was thinking a 20mm arch bolted at 90 down the gantry sides, i need to work out where the torsion might be acting... im pretty sure it wont be a staight line top to bottom

Have you had a look at irving's spreadsheet on this? It's interesting comparing the different sections with it.

Owch!! £100 meter, it did hurt spending that much but it is easy stuff to work with and its flat enough not to need machining

Yikes, that's a ridiculous price when you compare it to the material cost.

have you got an ESC for that monster motor yet ?

Not quite. According to the website I need at least 100A and 48v ESC, which is going to cost a lot even from hobbyking! I think a lower current ESC should survive as I'll never need that much power. I'm thinking of replacing the mosfets on a really cheap 100A 24v ESC I have for some much higher voltage ones...that should do the trick for very little money.

Alternatively a friend of mine has randomly acquired a 5.5 KW 400v variable frequency motor inverter from a lift. I think it might be adaptable...