A wood lathe has no carriage. You rest tools on a rest and hold them with your hands. A metal lathe has the bits clamped, they also turn at much slower rates.

I think it may be a little optimistic to think a metal lathe costs $25.

I would not try to ship something that large transcontinental. Have you checked Ebay/Craigslist/classified ads?

In order to help you out we need to have more information. Do you want a metal lathe or a wood lathe. What do you plan to do with it? A sherline is good for small metal stuff but if you want to do large things check craigslist for used lathes or look into 9x20 or 10x22 imports.

I am in the same boat as inon. I've got 2012 Inventor but can't help with Solidworks

I think mine stripped its gears after only four uses.

I would advise against buying one of those $10 12 volt compressors. They wont have the flow you need and will die after only a few uses.

Atm means atmosphere. It is equivalent to 14.7 .

I'm pretty sure I've seen this posted somewhere else on spudfiles. JSR, your search skills are needed.

ITWOST: I bent my APFSDS round today. I guess I have even more reason to go for a distance shot because it is useless for armor piercing now.

I like the guy singing Johnny Cash at around 2 min.

In order for that to work you will must likely have to make/install a much better seal and locking mechanism or it will likely blow itself to bits. This could cause problems with getting the faces to mate correctly. It would be pretty cool if you get it to work though.

They do not need a spike to rupture but, in order to give a estimate we need to know the diameter.

Trying to fuel a full size bbmg with 12g Co2 filler will get very expensive.

The center of gravity is exactly 6" from the tip. I made some holes in 1/8" plate steel but the fins never actually get through. It will bury itself approximately 5.5" into solid wood and is quite annoying to get out.