This should be the post about the lift in Brian's shop.
http://www.348-409.com/forum/threads/the-impala-shop.17213/page-4#post-151646
http://www.348-409.com/forum/threads/the-impala-shop.17213/page-4#post-151646
Robert, just call the water dept. put some blue paint on the floor and tell them, the leak is here.
I guess I'm overly cautious but there's no way I would walk under a two post lift bolted to 6 inches of concrete.
If I was going to install a two post lift in an existing building with a 4 inch concrete floor. I would rent a concrete saw, cut a 3' x 3' hole in the concrete under each post, dig a hole at least 24" deep then come back with 4000 psi concrete with four 18" long ankor bolts. Then I'd wait at least 3 or 4 days curing time before bolting the lift in place. Might be overkill but that's better than being killed
When I ordered my 10,000 lb bend pac 2 post I was told 4" of concrete was required. I have 6" and am not at all concerned. I routinely lift the front of a Peterbilt with a bottle jack and that is as heavy as the total lift capacity on ONE footprint that is much smaller than those on the lift. That's about double the lift capacity on half the footprint and I doubt that I will EVER get close to a 10,000 lb load on the lift. Even my dually diesel, crewcab 4X4 doesn't weigh 10,000 lbs. I know of others that put the same lift on 4" concrete and they put a 3ft X 3ft 1/2" plate under each post to spread the weight and have used them for years with no issues
True, but you have to take into consideration the balance of the weight. Spreading the weight across the area definitely helps but if you take the head from a motor and hold it up by your chest will it exert the same pressure as if you try to hold it at arms length? The issue in my opinion is more the front to back stress on the concrete than the up and down pressure.
True, but you have to take into consideration the balance of the weight. Spreading the weight across the area definitely helps but if you take the head from a motor and hold it up by your chest will it exert the same pressure as if you try to hold it at arms length? The issue in my opinion is more the front to back stress on the concrete than the up and down pressure.
Lots of great info here. I have been in the market for a 4-post (have a 2 post A-symmetrical) and I fought with the "China Syndrome". Worth Lifts out of Texas builds em' in the good ol USA. A little more buckeroos, but I'll get lasting pleasure and piece of mind with "Build in the USA. Great family biz to work with as well.
When I built my garage with a lift in mind, I had the floor poured 5" w
and Darrin put extra rebar in it. It's been seven years and I use it almost every weekend; no problems.
Now I'm looking to get a 4 post with casters so I can roll it outside and blast the bottom of cars with my dustless blaster.