Hi,

IMO you should reconsider some main points:

1. Z axis travel, bed depth ,4rth axis, gantry

-Z 200mm is ok and going more will lead to another problems, which would need reinforcement, that would l lead to more weight and that to servo motors.
I am doing a similar build so 200mm is ok for all, even for plasma, as i intend to do also.

-that singular gantry beam contradicts with the 200mm Z travel. 2 beams, say 100x100x4mm welded together will be better. Vibration wise.

-that removable bed you have drawn is mistake. Either make it proper removable bed like some designs here make it, not with angles but bolted directly side of the beams, or calculate the correct bed depth for 200mm axis and make it fixed. For a fixed bed, depending on design you need more or less 300mm from gantry beam when all mounted.

-4rth axis is no problem with say 300mm deep bed/from gantry beam/. The most ridgid 4rth axis worth for that type of machine, could be made from mini lathe, as i intend to, and it enters in 300mm bed from gantry, or you could make the axis inside the bed if you intend to spin things bigger than 300mm OD


2. Z
you should concentrate on the Z, draw it strong in all directions and all will start from there. Rails on the moving plate, and so on. Then the gantry, then the gantry sides...

3. Now that you have all this clear, you should decide how to move it. If you decide on servos, go back and make it as much strong as its reasonable.

4. Check if in real life the ball screw on the long axis will allow to be mounted like this. Will it pass once all welded.

5. As far as i read 4 inch deep plasma water bed is ok, so that will be removable, no need to be bolted onto anything.


Once you have it clear which way you would go, especially the motors, everything will speed up.