Recent content by 52wrench

Just a quick note. I'd rather put the compressive load into a cross beam instead of the vehicle frame.

The only true "dustless" blasting uses either water ice crystals or dry ice pellets. The water ice method leaves a lot of water and from a corrosion standpoint isn't desirable. The dry ice CO2 crystals simply sublimate into CO2 gas so the only clean up is the material that was removed. The...

There is no post flex that is "engineered in". In other words they don't size the posts to specifically have "x" amount of flex. The posts are sized to handle any vertical load and bending moment without exceeding the yield strength of the material and to meet a minimum safety factor. Is there...

Both of those are really really nice. I keep thinking about moving so I can have a much larger shop but then I think about all the moving BS and decide my detached 26x28 main shop and my 24x28 attached garage for storage is fine. I think I may get a 4 poster lift to stack one of the cars in the...

I did similar to you. Insulation board between the girts then studded between the posts with 2x6s and then glass batts then a plastic vapor barrier then drywall. You need a continuous plastic vapor barrier over all of the inside, don't rely on just the taped seams.

"The tops of the columns are attached to reinforced concrete wall (12 inch thick, two curtains of #5 rebar, on 8 inch centers) on one side and a W16x50 beam on the other." W16x50! Holy ****, I doubt if you're getting much flex in that. To all the doubting Thomas's - the OP wants to add a cross...

These guys are pretty close to me, I wonder if they would be stout enough for extending the uprights: http://winchester.craigslist.org/for/5343219008.html maybe too thin? I found the beamboy app to analyze beams, perhaps there is a pipeboy app somewhere It depends on how long they'd have to...

" don't think this is the case if the upright is actually plumb. The upright length only becomes a lever on the anchors if there is force applied in the x axis (sideways pull). Gravity is only pulling on the y axis. Obviously, the mechanic will introduce x axis forces at times like pulling on a...

part time gynecologist

"Assuming a fixed base as before, adding a cross bar/tie at the top (assumed pin connection with no slop) will not greatly reduce the amount of tension in the backside anchor bolts when the arms are loaded and say just above the base plates in elevation." That's true because the moment arm...

That's really a nice lift and shop you have. Please don't do the cable tie into the structure thing, do it right with a cross beam that can be used for a hoisting beam also. It will cost more of course but it's the right way to do it. I can help you with the beam and post extension sizing...

Agree, the cross beam and post extensions can be sized to handle a trolley and hoist set up for just the span of the lift or across to the outer walls. That would make a nice set up. But I'm sure lakeroadster will chime in on why it shouldn't be done, can't be safely designed, blah,blah,blah.

Never mind. As I said before, with your philosophy we'd still be using outhouses, driving Model A's, using phone booths, slide rules, etc,etc. For some unknown reason you can't accept the fact that there are a lot of people who feel more comfortable under a two post with a cross beam than w/o a...

That's a great idea. What is the width of your shop? I installed a W8x21 (8" depth, 21 lbs/ft) wide flg. I-beam across a clear 25' span. It was sized for a max of 1/2" deflection with 1 ton hanging from it mid-span. A great addition if you do engine removal work or work on heavy equipment. You...

for lakeroadster: First, the posts are installed parallel, Second, the vehicle is not attached to the lifting arms. Think.