First steel diy CNC router build

[ivars211]

Wow, that's a handy website not just for cnc!

Couldn't find many cnc's using timing belts for synchronising axis. So I attached what I came up with.

So the beech colored ones are P32-5M-15F (32T) and the green one is attached to stepper using P18-5M-15F (18T)
If my calculations is right I need around 2380mm of 15mm 5mm HTD timing belt.
A = 940mm
B1 = B2 = R*pi = 50.93*pi = 160mm (assuming half of the belt is on the pulley)
C1 = C2 = 430mm
D1 = D2 = 0.5*R*pi = 0.5*25.46*pi = 40mm (assuming 1/4 of the belt is on the pulley)
E1 = E2 = 50mm
F = R*pi = 25.46*pi = 80mm (assuming half of the belt is on the pulley)
So the total length: A+2*B1+2*C1+2*D1+2*E1+F = 2380mm

The problem is that there are only 2525mm or 2000mm available from here. So I guess I will have to fiddle a bit.
And does anyone knows where to get these rotating pulleys (purple on drawing), at least the proper name for them?

On the side note:
I am about to purchase ballscrews and rails from Chai, just want to make sure I have not forgotten anything:

SBR20-700/900mm(4 supported rails+8 SBR20UU blocks)
DFH15 profiled rails 2x400mm+4blocks
3pcs Anti backlsh ballscrews RM1605-450/750/950mm-C7(3screws+3ballnuts+3end machining)
+1 anti backlsh ballscrews RM1605 950mm - C7(ballnut + end machining)
4PCS NUT HOUSINGS/BRACKESTS(Made of Steel) FOR THESE 4 BALLNUTS
+ 4 set of BK/BF12 with locknuts and circlips
+ 2pc 6.35mm*10mm flexible couplings.

Thanks again.