Skeet the Grizzly 4003G is a belt drive, it's set up correctly IMO so that when you crash it it slips the belt instead of wiping out the gears. I'm not sure about the bigger machines but I'm guessing they are too. (I say "when" you crash it because I'm in construction.... Stuff Happens. If you ain't screwing up you ain't trying hard enough.)
The owner, Shiraz Balolia is a shooter. He designed the 4003G and advertised it here on BRC for a special trial price. He, or someone, also posted vids of Gordy Gritters chambering on Grizzly equipment. I bought one of those first ones and have been perfectly happy with it.
I will probably never have anyone do my gunsmithing work again. I'm pleasant to my children now, haven't kicked the dawg for months.... and I owe it all to not having to argue with other people about paying them to do what I want!
And don't worry about the "accuracy" thing..... alla' this talk about 50 Willionths is garbage. A Grizzly is plenty accurate for what we do and besides, you pour concrete, you KNOW how to find center, how to isolate what's real and what's chaff. What's important to ME is vibration control and tracking, I can now play with these effects. I can easily point a barrel where I want it.... I can predict where it will hit at 100yds within a couple inches. Any decent machinist should be able to do the same thing, and it sounds like you've got a good teacher.
Concrete guy???
You'll be a natural. Locating 50 bolt plates in 3 dimensions is just as hard as chambering a barrel.
And running these toy machines doing this sort of work is more ability than science anyways...... kinda' like excavating. How many GOOD excavators need a laser backing up their antique eye level? In our business they say "you gotta' know how to SHOVEL before you can run a backhoe" and that exactly illustrates the situation. If you can grade using an eye level then having Spectra-Physics set your mo'chine for an extra 50K doesn't make you any better
Same for concrete. My buddy Big Dave Somero invented the Laser Screed back when I was working for him in NH. It's now sold all over the world, it's redefined "Superflat," they had to redo the 'F' numbers for this BadBoy.... but a couple good men on a handrod can still make
flat. (it'll HURT worse!) And you can't pour 50,000 square with 10guys handrodding.... but you can still do good work.
You can do top-notch work on a Grizzly machine. It'll be SLOW, but you can do good work. And I do know topnotch work, I've bought it from 5 of the best gunsmith's in the world.... I have a benchmark. And if you find you don't have the knack, the lathe is still useful around the farm. A fun toy.
al
edit-edit-edit If you can afford a foot brake GET IT! Machinery is dan'rous.