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Posted by Steve B on May 6, 2006, 7:52 pm
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Well, in the midst of all my other projects, I went out and in one day
completed my hoist davit project for my cabin. This uses a vertical piece
of 150" long 2" x 2" x .250" square tube. There is a 48" right angle leg at
the top with a diagonal brace that comes in at 21" on the 48" horizontal and
150" vertical. I have used one pin at top and bottom, using a grade 8 1/2"
bolt that will fit into sockets top and bottom. The lifting point is
approximately 3" in from the end of the 48" top horizontal standoff.
Any predictions from the engineers in the group as to bending in the middle
of the 150" section with a 150# load? I really think that the maximum I
would lift with this is 21 gallons of water in the winter. Mostly, less
than 50# of groceries including the lift basket. Just a convenience device
to keep us from making several trips up and down the steep stairs schlepping
bags of groceries or "stuff".
A three phase ramp is being made as we speak, conforming to ADA standards,
and that will help a lot. Still, it will be nice to just pile groceries or
firewood in the lift, and lift 'er up.
I personally don't think it will flex enough to be a problem. When I get
the base footer poured, and make a 150# test lift, I will report the actual
lateral horizontal bending factor.
Anyone care to guess? Winner gets bragging rights. Place yer bets,
gentlemen. Will take a month or so. Going back up on the 19th, and a few
days to form and pour and cure the footer. This has been an ongoing
project, and it will take a while to complete. But, it's moving, at least.
So much to do. So little time.
Steve
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Posted by Grant Erwin on May 6, 2006, 8:02 pm
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Steve B wrote:
> Well, in the midst of all my other projects, I went out and in one day
> completed my hoist davit project for my cabin. This uses a vertical piece
> of 150" long 2" x 2" x .250" square tube. There is a 48" right angle leg at
> the top with a diagonal brace that comes in at 21" on the 48" horizontal and
> 150" vertical. I have used one pin at top and bottom, using a grade 8 1/2"
> bolt that will fit into sockets top and bottom. The lifting point is
> approximately 3" in from the end of the 48" top horizontal standoff.
>
> Any predictions from the engineers in the group as to bending in the middle
> of the 150" section with a 150# load? I really think that the maximum I
> would lift with this is 21 gallons of water in the winter. Mostly, less
> than 50# of groceries including the lift basket. Just a convenience device
> to keep us from making several trips up and down the steep stairs schlepping
> bags of groceries or "stuff".
>
> A three phase ramp is being made as we speak, conforming to ADA standards,
> and that will help a lot. Still, it will be nice to just pile groceries or
> firewood in the lift, and lift 'er up.
>
> I personally don't think it will flex enough to be a problem. When I get
> the base footer poured, and make a 150# test lift, I will report the actual
> lateral horizontal bending factor.
>
> Anyone care to guess? Winner gets bragging rights. Place yer bets,
> gentlemen. Will take a month or so. Going back up on the 19th, and a few
> days to form and pour and cure the footer. This has been an ongoing
> project, and it will take a while to complete. But, it's moving, at least.
>
> So much to do. So little time.
Careful, there, what you need to worry about (big time) is buckling on the main
vertical component. Might want to weld on a piece of flat bar on edge to stiffen
it or something. As is, it can suddenly fail and if you're under it you can get
hurt, almost got my leg broke one time when a similar thing buckled on me ..
GWE
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Posted by Steve B on May 6, 2006, 9:26 pm
Please log in for more thread options
> Steve B wrote:
>
>> Well, in the midst of all my other projects, I went out and in one day
>> completed my hoist davit project for my cabin. This uses a vertical
>> piece of 150" long 2" x 2" x .250" square tube. There is a 48" right
>> angle leg at the top with a diagonal brace that comes in at 21" on the
>> 48" horizontal and 150" vertical. I have used one pin at top and bottom,
>> using a grade 8 1/2" bolt that will fit into sockets top and bottom. The
>> lifting point is approximately 3" in from the end of the 48" top
>> horizontal standoff.
>>
>> Any predictions from the engineers in the group as to bending in the
>> middle of the 150" section with a 150# load? I really think that the
>> maximum I would lift with this is 21 gallons of water in the winter.
>> Mostly, less than 50# of groceries including the lift basket. Just a
>> convenience device to keep us from making several trips up and down the
>> steep stairs schlepping bags of groceries or "stuff".
>>
>> A three phase ramp is being made as we speak, conforming to ADA
>> standards, and that will help a lot. Still, it will be nice to just pile
>> groceries or firewood in the lift, and lift 'er up.
>>
>> I personally don't think it will flex enough to be a problem. When I get
>> the base footer poured, and make a 150# test lift, I will report the
>> actual lateral horizontal bending factor.
>>
>> Anyone care to guess? Winner gets bragging rights. Place yer bets,
>> gentlemen. Will take a month or so. Going back up on the 19th, and a
>> few days to form and pour and cure the footer. This has been an ongoing
>> project, and it will take a while to complete. But, it's moving, at
>> least.
>>
>> So much to do. So little time.
>
> Careful, there, what you need to worry about (big time) is buckling on the
> main vertical component. Might want to weld on a piece of flat bar on edge
> to stiffen it or something. As is, it can suddenly fail and if you're
> under it you can get hurt, almost got my leg broke one time when a similar
> thing buckled on me ..
>
> GWE
Thanks, Grant. I have been standing back and looking at this, and I EXPECT
bowing in the middle. How much, of course is going to depend on the load.
Since I don't anticipate loading it that much, I think I can live with the
bowing. HOWEVER, knowing myself, I will continue to increase the load.
Welding a flatbar strengthener along the edge is a great idea, it's just
that if I do it, I won't be able to measure the ACTUAL deflection. But
then, to accurately assess this, I would almost have to load until failure
occurs, then backtrack. I believe I will put a 1/4" x 2" FB stiffener for
about six feet, centered, and call it a day.
I don't want to do this again if it fails.
Steve
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Posted by Grant Erwin on May 6, 2006, 9:54 pm
Please log in for more thread options Steve B wrote:
>
>>Steve B wrote:
>>
>>
>>>Well, in the midst of all my other projects, I went out and in one day
>>>completed my hoist davit project for my cabin. This uses a vertical
>>>piece of 150" long 2" x 2" x .250" square tube. There is a 48" right
>>>angle leg at the top with a diagonal brace that comes in at 21" on the
>>>48" horizontal and 150" vertical. I have used one pin at top and bottom,
>>>using a grade 8 1/2" bolt that will fit into sockets top and bottom. The
>>>lifting point is approximately 3" in from the end of the 48" top
>>>horizontal standoff.
>>>
>>>Any predictions from the engineers in the group as to bending in the
>>>middle of the 150" section with a 150# load? I really think that the
>>>maximum I would lift with this is 21 gallons of water in the winter.
>>>Mostly, less than 50# of groceries including the lift basket. Just a
>>>convenience device to keep us from making several trips up and down the
>>>steep stairs schlepping bags of groceries or "stuff".
>>>
>>>A three phase ramp is being made as we speak, conforming to ADA
>>>standards, and that will help a lot. Still, it will be nice to just pile
>>>groceries or firewood in the lift, and lift 'er up.
>>>
>>>I personally don't think it will flex enough to be a problem. When I get
>>>the base footer poured, and make a 150# test lift, I will report the
>>>actual lateral horizontal bending factor.
>>>
>>>Anyone care to guess? Winner gets bragging rights. Place yer bets,
>>>gentlemen. Will take a month or so. Going back up on the 19th, and a
>>>few days to form and pour and cure the footer. This has been an ongoing
>>>project, and it will take a while to complete. But, it's moving, at
>>>least.
>>>
>>>So much to do. So little time.
>>
>>Careful, there, what you need to worry about (big time) is buckling on the
>>main vertical component. Might want to weld on a piece of flat bar on edge
>>to stiffen it or something. As is, it can suddenly fail and if you're
>>under it you can get hurt, almost got my leg broke one time when a similar
>>thing buckled on me ..
>>
>>GWE
>
>
> Thanks, Grant. I have been standing back and looking at this, and I EXPECT
> bowing in the middle. How much, of course is going to depend on the load.
> Since I don't anticipate loading it that much, I think I can live with the
> bowing. HOWEVER, knowing myself, I will continue to increase the load.
> Welding a flatbar strengthener along the edge is a great idea, it's just
> that if I do it, I won't be able to measure the ACTUAL deflection. But
> then, to accurately assess this, I would almost have to load until failure
> occurs, then backtrack. I believe I will put a 1/4" x 2" FB stiffener for
> about six feet, centered, and call it a day.
>
> I don't want to do this again if it fails.
>
> Steve
>
>
This is on the vertical member, mind you, NOT the horizontal one.
Machinery's Handbook has tables of max loading on columns. Worth checking, the
library has one if you don't, don't need the latest.
GWE
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Posted by Steve B on May 6, 2006, 9:57 pm
Please log in for more thread options
> Steve B wrote:
>
>>
>>>Steve B wrote:
>>>
>>>
>>>>Well, in the midst of all my other projects, I went out and in one day
>>>>completed my hoist davit project for my cabin. This uses a vertical
>>>>piece of 150" long 2" x 2" x .250" square tube. There is a 48" right
>>>>angle leg at the top with a diagonal brace that comes in at 21" on the
>>>>48" horizontal and 150" vertical. I have used one pin at top and
>>>>bottom, using a grade 8 1/2" bolt that will fit into sockets top and
>>>>bottom. The lifting point is approximately 3" in from the end of the
>>>>48" top horizontal standoff.
>>>>
>>>>Any predictions from the engineers in the group as to bending in the
>>>>middle of the 150" section with a 150# load? I really think that the
>>>>maximum I would lift with this is 21 gallons of water in the winter.
>>>>Mostly, less than 50# of groceries including the lift basket. Just a
>>>>convenience device to keep us from making several trips up and down the
>>>>steep stairs schlepping bags of groceries or "stuff".
>>>>
>>>>A three phase ramp is being made as we speak, conforming to ADA
>>>>standards, and that will help a lot. Still, it will be nice to just
>>>>pile groceries or firewood in the lift, and lift 'er up.
>>>>
>>>>I personally don't think it will flex enough to be a problem. When I
>>>>get the base footer poured, and make a 150# test lift, I will report the
>>>>actual lateral horizontal bending factor.
>>>>
>>>>Anyone care to guess? Winner gets bragging rights. Place yer bets,
>>>>gentlemen. Will take a month or so. Going back up on the 19th, and a
>>>>few days to form and pour and cure the footer. This has been an ongoing
>>>>project, and it will take a while to complete. But, it's moving, at
>>>>least.
>>>>
>>>>So much to do. So little time.
>>>
>>>Careful, there, what you need to worry about (big time) is buckling on
>>>the main vertical component. Might want to weld on a piece of flat bar on
>>>edge to stiffen it or something. As is, it can suddenly fail and if
>>>you're under it you can get hurt, almost got my leg broke one time when a
>>>similar thing buckled on me ..
>>>
>>>GWE
>>
>>
>> Thanks, Grant. I have been standing back and looking at this, and I
>> EXPECT bowing in the middle. How much, of course is going to depend on
>> the load. Since I don't anticipate loading it that much, I think I can
>> live with the bowing. HOWEVER, knowing myself, I will continue to
>> increase the load. Welding a flatbar strengthener along the edge is a
>> great idea, it's just that if I do it, I won't be able to measure the
>> ACTUAL deflection. But then, to accurately assess this, I would almost
>> have to load until failure occurs, then backtrack. I believe I will put
>> a 1/4" x 2" FB stiffener for about six feet, centered, and call it a day.
>>
>> I don't want to do this again if it fails.
>>
>> Steve
>
> This is on the vertical member, mind you, NOT the horizontal one.
>
> Machinery's Handbook has tables of max loading on columns. Worth checking,
> the library has one if you don't, don't need the latest.
>
> GWE
Yep, that would be on the vertical. The horizontal is much shorter, and has
a diagonal brace under it at 21" out. I have a 'Thomas Glover Pocket Ref,
and will see if I can find out anything. BUT, it would be different, as it
connects into the vertical, and the vertical bow is the critical part.
Again, as I say, I doubt the thing will ever have 100# on it, but I just
like being triple sure when something can come down and do brain damage.
Steve
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> completed my hoist davit project for my cabin. This uses a vertical piece
> of 150" long 2" x 2" x .250" square tube. There is a 48" right angle leg at
> the top with a diagonal brace that comes in at 21" on the 48" horizontal and
> 150" vertical. I have used one pin at top and bottom, using a grade 8 1/2"
> bolt that will fit into sockets top and bottom. The lifting point is
> approximately 3" in from the end of the 48" top horizontal standoff.
>
> Any predictions from the engineers in the group as to bending in the middle
> of the 150" section with a 150# load? I really think that the maximum I
> would lift with this is 21 gallons of water in the winter. Mostly, less
> than 50# of groceries including the lift basket. Just a convenience device
> to keep us from making several trips up and down the steep stairs schlepping
> bags of groceries or "stuff".
>
> A three phase ramp is being made as we speak, conforming to ADA standards,
> and that will help a lot. Still, it will be nice to just pile groceries or
> firewood in the lift, and lift 'er up.
>
> I personally don't think it will flex enough to be a problem. When I get
> the base footer poured, and make a 150# test lift, I will report the actual
> lateral horizontal bending factor.
>
> Anyone care to guess? Winner gets bragging rights. Place yer bets,
> gentlemen. Will take a month or so. Going back up on the 19th, and a few
> days to form and pour and cure the footer. This has been an ongoing
> project, and it will take a while to complete. But, it's moving, at least.
>
> So much to do. So little time.