Steel Router 610 x 1220 x 200

[Jonathan]

I am not sure if my steppers will be up to the task of moving the heavy gantry around, I would really like to be able to take some pretty fast and aggresive cuts on wood and acrylic, I'm thinking quick direction changes in the X direction might be a problem?

I'm using the same steppers for my machine which is bigger so probably heavier and they work fine. I used 10mm pitch, which helps as 1/4 the K.E. in the screw and on the X-axis rotated the ballnuts which helps even more...If you want high feedrates then get 10mm pitch screws and ideally timing belt/pulleys not direct drive to get the optimal ratio. I'm running the motors on 75V which is necessary to get high enough torque at high speed.

Will I have problems with the X and Y leadscrews whiping?

Depends how fast is 'pretty fast'! Y will be fine. If you use 10mm pitch screws then the RPM of the screw is of course halved, so you can go twice as fast before whipping.

X is 1500mm with angular contact on one end and single bearing on the other, 5mm pitch:
(approximately)
16mm diameter critical speed is 5000mm/min
20mm diameter 6000mm/min
25mm diameter 7700mm/min

Double those if you use 10mm pitch. Those feedrates are achievable with the 3nm motors .. I got much more.

On that size machine I would *definately* go for two screws on the X-axis to prevent racking especially as you want to take 'agressive cuts'.

Your Z axis linear bearing blocks look too close together for that travel.