[jdclark]

I have no idea ... but I also have no posibility to work with cast metal or
steel . so , I used the next best thing. But I really hope that the machine
will perform well . It's already heavy ( 250KG / around 500pounds ) , the
design is fairly good , and it's stiff ... entire assy is only at mokup level
now ( very few screws , about 10% of final amount needed ) , nothing
is aligned yet , and still , the entire **** does not vibrate when I strike
the column with a rubber hammer ...

Here are some pics of final project , made in Rhino ... You will see that
the base structure is pretty solid ...

Nice design and work- What's the spindle ? How much do you think your build cost will be for materials?