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Thread: Supporting a trussed roof
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8th Sep 2021, 07:52 PM #1
Supporting a trussed roof
My OCD has kicked in again and I need to lift my Lathe (Hafco AL-320), so I can remove its stand for some modification.
I believe its approx. 280 Kg gross weight, going by the handbook.
Given room restraints, I need to lift it from the Hardwood truss above, just enough to remove the stand and pack, while I work on the stand.
I have now idea about whats required to strengthen the truss etc
Truss is 7.2mtr from wall frame (Hardwood) to wall frame, and is supported @ 3.6mtr , by studded wall (pine).
Enlighten me gentlemen.Hafco AL320G Lathe
Toolex RF31 Mill/Drill
Saber Bandsaw
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8th Sep 2021, 08:04 PM #2Most Valued Member
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I would enlighten you into finding any other way to do it, even make a pair of A frames or take the lathe outside and do the work with an engine crane or hired gantry
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8th Sep 2021, 08:19 PM #3Diamond Member
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8th Sep 2021, 08:22 PM #4Most Valued Member
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What cask said.
Too many unknowns and potential injury and expense if something goes wrong.
At nearly 300kg, it's alot of weight as a single point load on a roof beam that was not designed to hold that extra weight.
At a guess, at best you will get away with cracked plaster.
Do a forum search for things like rollers or jack lifting attachment etc. Quite a few options for lifting and moving machinery.
Simon
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8th Sep 2021, 09:23 PM #5Golden Member
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Let me put it another way. Would you and two of your mates get up in the roof cavity and stand side by side on the truss? If yes you have your answer.
If not consider two A frame ladders with a beam between them as a gantry. A lot of ladders will hold 150KG.
To put a few things into perspective. A solar hot water system full of water will weigh more than a lathe but spread over a few trusses.
Is it possible to support it by two roof trusses. This is similar to two large blokes working in the roof side by side.
Steve
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8th Sep 2021, 10:07 PM #6
Can we get a picture of the roof trusses, a 4x2 hardwood spread across roof trusses would help a lot as Reidy said.
You could always put a prop under the truss close as well, but a picture would help a lot.
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8th Sep 2021, 10:33 PM #7Most Valued Member
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Acrows and some angle iron….
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9th Sep 2021, 08:45 AM #8
thanks gents, some good ideas
lifting point would be between two trusses. I will try and get picture, but it will be hard to get a good view of the area.Hafco AL320G Lathe
Toolex RF31 Mill/Drill
Saber Bandsaw
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9th Sep 2021, 10:22 AM #9Most Valued Member
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9th Sep 2021, 08:33 PM #10
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10th Sep 2021, 12:46 AM #11
Hi Oldhack,
Thanks for the pictures !
Those trusses only look like 2" X 4" ! I would take the advice to support them whilst you do the lifting. A couple of lengths of 4" square used as props temporarily wedged under the truss would support the weight easily.Best Regards:
Baron J.
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10th Sep 2021, 08:22 AM #12
thanks for the reply BaronJ.
I'll try it with props under the bottom truss cords, as mentioned previously the lift point is between tresses, so I need something strong enough between the trusses. would 75 x 75 x 8 angle be sufficient ?
Kicking myself I didn't add cross braces to the lathe stand when I made them now. But I'm having vibration issues above 1000rpm., I'm hoping adding braces will be the answer. I seem to recall reading conveyor belt under the feet helps too.Hafco AL320G Lathe
Toolex RF31 Mill/Drill
Saber Bandsaw
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10th Sep 2021, 05:21 PM #13
It should be, however it depends upon how long it is between supports. A good way to estimate the strain on your angle, would be to support it on a couple of bricks on the floor spaced the same as the trusses and stand on the middle, or the point that you are going to attach the load and see how much it flexes.
Kicking myself I didn't add cross braces to the lathe stand when I made them now. But I'm having vibration issues above 1000rpm., I'm hoping adding braces will be the answer. I seem to recall reading conveyor belt under the feet helps too.Best Regards:
Baron J.
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10th Sep 2021, 08:22 PM #14
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10th Sep 2021, 09:57 PM #15Most Valued Member
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Two pieces of angle under the timber, a sufficiently sized piece of RHS long side vertical on top, put an Acrow under each piece of angle and clamp the whole lot together. RHS is just a bit kinder on the slings. If you already have a chunk of thick angle use it in an L not an inverted V and clamp a chunk of wood to it to remove the small edge the slings are pulling up on. Put a piece of rubber or soft timber under the bottom of the Acrow.
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