Second CNC table build, here we go again....

[Davek0974]

Hi all,
I am now starting my second table build, this time a bit bigger at 1250x1250mm cut area, I have also upgraded to a Hypertherm Powermax 45 cutter. My first table is now too small and cannot handle the speeds needed by the PM45.

I have just about decided to go with ballscrews all round, 16 or 20mm lead with anti-backlash nuts, motion is on HiWin 15mm rails and carriages with scrapers and wipers fitted.

Here's a couple of sketches of the gantry ends, just ideas at present but would seem to fit well..


The main table will be 50x50x5mm box section steel, fully welded, the motion supports will be bolted on so I can shim them up and avoid welding warp etc.

The top rails or Y-axis will be above the bed so I can slide a bigger sheet in if wanted, this will also keep the tracks and screws above the pierce splatter.

Drive is with my existing Nema23 3.1Nm steppers, if that does not play nicely then I can upgrade easily to Nema23 servos.

I am aiming to get a speed range of 100mm to 9000mm/min so I can use the full range of the PM45 without messing around.

Feel free to offer any advice :)