Sturdy and Fast all Steel CNC , my first build

[HipoPapi]

Hi,

I am planning to use 2x 750w servos on the X, 1x 750w servo on the Y and a 400w servo on Z.
The shaft on the 750w servo is 19mm dia and 31mm long so in fact that is what determines my smallest pulley.
I am planning to use 25mm HTD belts as my gantry will be close to 200 kg plus the belts are rated for -25 degrees Celsius.

In the Case of a 5 pitch pulley for 25 mm belts F= 30.5 which means that that is my whole 31mm shaft. So if I would want to use the whole L which is 38 I would have 7mm of the pulley hanging of the servo shaft. If I want to use grub screw I would be limited by Dm and an even larger Dm if I want to use key. So I have decided to cut of F from L and use just F and key cutting therefore I can use a smaller pulley and I am limited only by (De) and have nothing hanging of the shaft.
So basically 24 t pulley on the servo where Dp=38.20 and 72 t pulley on ballscrew where Dp = 114.59 giving me
a ballscrew rpm of 1000.09 on the ballscrew with 3000 rpm on the servo side so essentially 3:1.
With a 2010 ballscrew my critical speed is 1128 so would be able to get 10m/m rapids or I can go with 2020 ballscrew and get 20m/m.

With the resin my worry is that here in the uk we are getting around 21-25 degrees Celsius during day time and it goes down to 15 during the night. But I did not look into it so deeply yet and maybe that isn't a problem with the 105+209. If By any chance you already know it please let me know.

Thanks,
Vass