Question for you engineer types
Methanoholic
Joined: Mar 2009
Posts: 6,442
Likes: 8
From: Maine (NorCal Native)
I believe the 2 2x6 will hold if if you can narrow the supports down to the width of the truck, however I would use the 2x8's, they would likely support it even over a 12' span, however I would still narrow it with temp supports to the width of the truck!
When you cut the plywood, use an 8' piece in the center and two short ones on each end.
I just did two motors on asphalt and it was not easy at all to move the hoist and it left some pretty good tracks, I suspect plywood would not work, but I don't know for sure. Plywood is strong, but not that way.
Advantech sub flooring might though, It's called Home Advantage at Home Depot, It's a highly compressed osb type with a lot of resin squeezed in, much much stronger than osb.
The problem is, if 'whatever' fails it could be hazardous to ones health.
-Enjoy
fh : )_~
When you cut the plywood, use an 8' piece in the center and two short ones on each end.
I just did two motors on asphalt and it was not easy at all to move the hoist and it left some pretty good tracks, I suspect plywood would not work, but I don't know for sure. Plywood is strong, but not that way.
Advantech sub flooring might though, It's called Home Advantage at Home Depot, It's a highly compressed osb type with a lot of resin squeezed in, much much stronger than osb.
The problem is, if 'whatever' fails it could be hazardous to ones health.
-Enjoy
fh : )_~
Methanoholic
Joined: Mar 2009
Posts: 6,442
Likes: 8
From: Maine (NorCal Native)
Got me curious now, I'm trying to dig up my lumber structural loading book!
IIRC, house floor loading requirements are 1500 PSI, A single 2x8 is legal for 12' span on 16" centers, the sheeting adds to the strength of each joist.
I gotta believe a 2x8 with 1/2" plywood sandwich would hold on a 12' span, I know I would try it, of course very carefully at first, just lift an inch or so and test stability.
-Enjoy
fh : )_~
IIRC, house floor loading requirements are 1500 PSI, A single 2x8 is legal for 12' span on 16" centers, the sheeting adds to the strength of each joist.
I gotta believe a 2x8 with 1/2" plywood sandwich would hold on a 12' span, I know I would try it, of course very carefully at first, just lift an inch or so and test stability.
-Enjoy
fh : )_~
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Senior User
Joined: Jun 2010
Posts: 421
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i pulled my 7.3l with one 4x4 over about a 9' span. that was the complete motor minus accessories. hardly any swag, but it's a rough sawn white oak 4x4. wood can be very strong have repelled off cliffs tied to trees only 2-3" thick. if you want to roll hoist across ground use MDF or if you can find it HDF as there is no viods in them. i use MDF at work to make doors and we stack it like 150 sheets high at 120lbs per sheet.
Senior User
Joined: May 2010
Posts: 337
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From: Des Moines
I'm not an engineer, but I did stay at a Holiday Inn last night.
Dug out my slide rule, dusted off my pocket protector and got on my geekie black horned rim glasses...
Nope. OSB, or oriented strand board, has no axis of strength, or grain, as in normal wood products. Even a fraction of an inch misalignment top to bottom and your OSB is going to return to it's natural unlaminated state (toothpicks)
Better to do it right instead of trying to breathe with 1200 lbs of pig iron on your ribcage.
Dug out my slide rule, dusted off my pocket protector and got on my geekie black horned rim glasses...
Nope. OSB, or oriented strand board, has no axis of strength, or grain, as in normal wood products. Even a fraction of an inch misalignment top to bottom and your OSB is going to return to it's natural unlaminated state (toothpicks)
Better to do it right instead of trying to breathe with 1200 lbs of pig iron on your ribcage.
Thread Starter
|
Posting Guru
Joined: Dec 2009
Posts: 1,272
Likes: 0
i pulled my 7.3l with one 4x4 over about a 9' span. that was the complete motor minus accessories. hardly any swag, but it's a rough sawn white oak 4x4. wood can be very strong have repelled off cliffs tied to trees only 2-3" thick. if you want to roll hoist across ground use MDF or if you can find it HDF as there is no viods in them. i use MDF at work to make doors and we stack it like 150 sheets high at 120lbs per sheet.
Thread Starter
|
Posting Guru
Joined: Dec 2009
Posts: 1,272
Likes: 0
I'm not an engineer, but I did stay at a Holiday Inn last night.
Dug out my slide rule, dusted off my pocket protector and got on my geekie black horned rim glasses...
Nope. OSB, or oriented strand board, has no axis of strength, or grain, as in normal wood products. Even a fraction of an inch misalignment top to bottom and your OSB is going to return to it's natural unlaminated state (toothpicks)
Better to do it right instead of trying to breathe with 1200 lbs of pig iron on your ribcage.
Dug out my slide rule, dusted off my pocket protector and got on my geekie black horned rim glasses...
Nope. OSB, or oriented strand board, has no axis of strength, or grain, as in normal wood products. Even a fraction of an inch misalignment top to bottom and your OSB is going to return to it's natural unlaminated state (toothpicks)
Better to do it right instead of trying to breathe with 1200 lbs of pig iron on your ribcage.
Thread Starter
|
Posting Guru
Joined: Dec 2009
Posts: 1,272
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Im thinkin Ill go with a chain hoist,I know a feller thats a retired master carpenter,he should be able to give some pointers as well ,he also has a chain hoist I can borrow,only drawback with this guy ...hes one of those Marines !!!!