DIY Si
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| posted on 12/1/10 at 12:18 PM |
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Engine crane frame for a garage
Afternoon.
Another quick question. It's been a good long while since I last did any mechanical bending stress calculations, so I've decided to ask
you lot instead!
I'm looking at putting a frame across the middle of my garage. The frame will both help support the currently unsupported centre of the roof
joists so I can use the roof space for some light weight storage and act as a frame for an engine crane to run on. The frame will be bolted to the
floor and have no other support, unless needed.
What size I beam would be wise to use? The total load should not exceed 500 kgs of engine/box/crane in the centre of the beam plus the weight of
whatever I put in the roof space, so maybe 300kgs including me crawling around.
Yes, I know I should get an engineer involved, but I don't see the point in spending money on something that I'm sure I can over-engineer
all by myself.
“Let your plans be dark and as impenetratable as night, and when you move, fall like a thunderbolt.”
Sun Tzu, The Art of War
My new blog: http://spritecave.blogspot.co.uk/
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Tatey
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| posted on 12/1/10 at 12:36 PM |
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Im an inexperienced undergrad Mechanical Engineering student so i might be able to offer a little bit of help.
I think we may need a bit more information such as, how wide is the frame going to be, how is the frame going to be supported e.g. just at the far
edges or will there be a middle support?
[Edited on 12/1/10 by Tatey]
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mcerd1
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| posted on 12/1/10 at 12:45 PM |
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I'm not an expert on cranes but I have designed one before 
as above, some more details would help 
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DIY Si
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| posted on 12/1/10 at 12:48 PM |
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Sorry, I knew I'd left something out!
Width is 2.5m, height is 2.3m and the frame support will be a steel foot plate at both edges, so no central support.
The total load should not be greater than 2000 kgs, just to be on the safe side, although a safety factor wouldn't hurt. The frame will be made
from common structural steel.
Anything else I've forgotten?
“Let your plans be dark and as impenetratable as night, and when you move, fall like a thunderbolt.”
Sun Tzu, The Art of War
My new blog: http://spritecave.blogspot.co.uk/
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dhutch
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| posted on 12/1/10 at 12:48 PM |
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Yeah, you should be able to do it as a first year mech end (im now 5th year, so forgotten it all)
The key peice of infomation would the lenght of the beam, then assume simply supported at each end, material will be a mild steel most likely
(proberbly box section or I section) and then assume both loads act together (call it a ton) in the center of the beam (worse case) and see what
numbers it gives you.
Thinner wall larger sections will be cheaper for the same strengh/deflection as steel is basicaly sold by the ton and ofcause hieght gives you
stiffness/stenght rather than width although dont forget its still got to not buckle sideways if the engine swings a little (you might not be
calc'ing this is all)
Try something like a 4*2inch 3mm wall square section beam. Proberbly overkill but more than enough. Might also be worth looking at a local
scrapsteel/reclamtion place for a bargin section of steel.
Otherwise look at sections of gantry ebay. Cheapest option might actaully be 10ft of secondhand ex-indusrty I-section crane gantry and a gantry hoist,
partiuarly if you can get one from a liquidator (sadly).
Daniel
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Davey D
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| posted on 12/1/10 at 12:49 PM |
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i think im using a 178x102 beam in my garage to run my electric winch along
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DIY Si
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| posted on 12/1/10 at 12:51 PM |
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Oh, just to be awkward, the beam needs to be an I beam, so I can run a crane along it as well!
“Let your plans be dark and as impenetratable as night, and when you move, fall like a thunderbolt.”
Sun Tzu, The Art of War
My new blog: http://spritecave.blogspot.co.uk/
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mcerd1
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| posted on 12/1/10 at 01:09 PM |
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don't worry I beams are 2/3 the price of box sections for the same weight
do you think you could sketch up roughly what you want (to save any confusion)
for the students out there:
your basically designing the steel to BS5950-1, but this will get you to add loads from BS2573-1 as well
this will give you a 1.6* factor on the imposed loads
steel grade will be S275 JR (unless you find some of that cheap european stuff S235)
[edit] btw - I also did mech eng at uni, I was in 1st year in 1999 - so I don't remember much of that - but I've been designing structural
steelwork for the last 6 years so I should manage to come up with something (I'll have a look later tonight)
[Edited on 12/1/10 by mcerd1]
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bartonp
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| posted on 12/1/10 at 01:41 PM |
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Google 'superbeam' software....
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zilspeed
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| posted on 12/1/10 at 05:07 PM |
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My setup won't carry the weight you're looking for, but it may give you some ideas.
The hoist of zil.
[Edited on 12/1/10 by zilspeed]
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fesycresy
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| posted on 12/1/10 at 05:08 PM |
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It's a long time since my 1st year BEng, but I go by a different principle now.
What's kicking around on site that I can rob
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The sooner you fall behind, the more time you'll have to catch up.
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DIY Si
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| posted on 14/1/10 at 08:47 AM |
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Come on then you engineers. Having been a student I know you've not had much else to do!
“Let your plans be dark and as impenetratable as night, and when you move, fall like a thunderbolt.”
Sun Tzu, The Art of War
My new blog: http://spritecave.blogspot.co.uk/
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mcerd1
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| posted on 14/1/10 at 10:21 AM |
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u2u me your e-mail address
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mcerd1
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| posted on 14/1/10 at 11:04 AM |
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you've got mail
[Edited on 14/1/10 by mcerd1]
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DIY Si
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| posted on 14/1/10 at 11:55 AM |
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So do you now! 
“Let your plans be dark and as impenetratable as night, and when you move, fall like a thunderbolt.”
Sun Tzu, The Art of War
My new blog: http://spritecave.blogspot.co.uk/
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