First steel diy CNC router build

[Jonathan]

Hello, I just wanted to ask quick question, is ~35kg gantry too heavy for two nema23 435oz? Does weight even matter so much? Tried to look up on google, but without success.

You're looking at things the wrong way round. Design the gantry to be as strong as you need, then get motors to suit. If the gantry ends up too weak due to lightening it to suit particularly motors, then the machine is arguably no longer any use to you.

The 35kg isn't a problem - the inertia of all the pulleys will be more than the gantry. See these threads:

http://www.mycncuk.com/forums/machin...do-i-need.html
http://www.mycncuk.com/forums/machin...do-i-need.html

The latter was intended for servos, but the formulas to find the required torque obviously don't change so you can use that to calculate the torque required for each axis and compare this to the motor torque vs speed curve.

P.S: Listen to Clive regarding the ballscrews.