600x900 Steel welded router build

[Jonathan]

Some others will advise you (among other things) not to use 25mm ballscrews, since for this size machine the critical speed of 16mm ballscrews would be high enough to get decent feedrates. Your Z-axis looks a bit flimsy compared to the rest of the machine.

[embraced]

Thanks for the suggestions.

For the gantry, i'm going to have it stress relieved and then milled back. For the frame, i'm going to use an epoxy bed - i think that getting the frame milled flat would be very, very expensive.
I'll add some diagonal bracing to the frame too.

As for the ballscrews, I think you're right Jonathan - the critical speed for this design in a 16mm ballscrew would be around 1600rpm. That's probably near the limit of what the steppers can provide.
I will thicken the plate used for the Z axis - I would rather not reverse the rails and blocks.

[embraced]

I've added braces to the legs in all directions.

I've also increased the thickness of the Z axis plate that will have the spindle connected to it. Previously it was 16mm, now it's 25.

[embraced]

I have a question regarding the motor selection:

I have 600W AC servos in my possession that I'd like to use for this build instead of the NEMA 34 motors.
They have a continuous torque rating of 1.91N.m. - and with the 10mm lead ballscrews, I will get 1200N of linear force.

The gantry and all components attached to it weighs in at 100kg. From dual-driving the gantry, the combined linear force of both motors amounts to 2400N.

Is this enough to move the gantry with a reasonable factor of safety?

[Boyan Silyavski]

What is your servo encoder count per revolution?

[embraced]

10,000 per revolution.