http://www.ebay.co.uk/itm/HTD-5mm-Pitch-Timing-belt-25mm-width-2525mm-long-505-tooth-CNC-ROBOTICS-/251051514482?pt=UK_BOI_Industrial_Automation_Control_ET&hash=item3a73d61a72yes 2525 = divided by 6 = 420 square ish

25mm belt

even do it dual shaft motor with dual belt top and bottom dual idler

plasma torch eletro magnet up down or cable pull or twist

plus of course there doesn't seem to be any reason why you couldn't double up the motors and have 4 = one in each corner too.

vroom vroom

so doing the sums in your head 'i can't' IF I were to buy one of thos belts

5mm pitch, 2525mm long with 505 toofs, what diameter drive gear would you suggest?

plus considering its a 500mm square bed and there is no weight bar two 45mm square lengths of t-slot and a plasma torch, could you get away with 4 nemae 17's or would you run with the smallest 23's - but still dual shaft?

p.s. I have a shed - litereally - load of 45mm squar t-slot, so I plan on simply bolting a square together, then bolting on some t-slot thk rail 'maybe top and bottom see!!! - with a simple triangle on two block bearings with a spacer on the y the width of the bearing, twin tubes for y axis with a left and righty for a turn buckle effect for tensioning at each end.

plus of coure in the table corners its simple triangles with fout holes for the motor mounts and a cebntred hole for the shaft, poulley on top, enclose the motors

wireing going through the t-slot, like majic.

plus the y-axis triangle hold the idlers.

i think i need to buy some bits, anyone got 4 thk rails and 8 bearing blocks and 4 dual shaft motors, 2 2525 belts , 4 idlers etc etc