Couple of more pictures of what it should look like when finished .
The two bores will get 4 lineair bearings wich will slide on two supported rails on a fully supported frame . More a design exercise then a practical machine .
These two "prototypes" were carved out out of a large block I cast in a square paintcan .
Took a lot of metal to remove , the entire shop was full of chips .
And when I finally got there , I goofed up with the two bores .
On both parts .
So start over again from scratch , hence the sand casting to avoid removing all that metal again .
Now let's see if I can getthose bores right this time .
The steppers are rotating nut types .
A fixed leadscrew has several advantages , and the steppers already have an integrated inti backlash nut .
Well worth giving it a try