First time build - Steel Frame CNC Router

[Boyan Silyavski]

Yes, ZA preload. BST Automation aliexpress, Fred if you have not figured the provider. You could use my name as reference and he will give you the right prices. Most of the people here buy the stuff from him. Alsmost always he has the best price and most importantly packs very well and stands behind if there is an error or fault

Hard stops also could be 4 big bolts or small plates welded at the sides that the plate that attaches to the ball screw hits them at end of travel. Your looks ok, just dont like the plates at the back of table, better as in front- box section.

The main mission of the hard stops /according to me/ apart of stopping the machine travel, is to stop it at that moment say just 2cm before ballnut travel ends. They must be nearly as possible square as i mount there the limit switches and they are my reference of squareness. So i use straight edge and make them truly square and weld them at the end when gantry is mounted and squared. If you understand what i mean

So i see the real beauty when the machine frame length or say distance between hard stops at the end of frame is = (desired travel) + 2cm
where travel = ball screw length - length of the gantry legs) + 2cm

So i know i have not wasted spinning mass that does nothing