Diy garage gantry crane
Discussion
I'm thinking about building an overhead gantry crane in my 5m x 5m garage.
Initial idea was to use 2 x 5m Universal Beams (RSJ) supported by steel square section at each end with another sliding Universal Beam of the same size riding on top.
What sort of point load would I be able to safely hold if the beams were 127x76x13 for example?
The immediate use is for a fibreglass body (150kg) but ideally would want to use up to 250kg really.
Initial idea was to use 2 x 5m Universal Beams (RSJ) supported by steel square section at each end with another sliding Universal Beam of the same size riding on top.
What sort of point load would I be able to safely hold if the beams were 127x76x13 for example?
The immediate use is for a fibreglass body (150kg) but ideally would want to use up to 250kg really.
Edited by bagofjuice on Monday 29th October 08:28
If I've done my calcs right ( I used this), then the the two 5m end beams, centre supported, will have a deflection of ~1.7mm at the unsupported centres with ~350Kg point load.
The sliding cross beam (on rollers above the other two beams) also spans 5m (but unsupported in the centre) and will hold a rolling hoist - I've calculated a deflection of around ~9.5mm at ~250Kg point load in the centre.
A few questions:
- I'm a bit nervous about the calculations - Is the above in the ballpark of what you would expect?
- Do these types of calcs generally take into account the weight of the steel itself?
- What is the max acceptable deflection?
The sliding cross beam (on rollers above the other two beams) also spans 5m (but unsupported in the centre) and will hold a rolling hoist - I've calculated a deflection of around ~9.5mm at ~250Kg point load in the centre.
A few questions:
- I'm a bit nervous about the calculations - Is the above in the ballpark of what you would expect?
- Do these types of calcs generally take into account the weight of the steel itself?
- What is the max acceptable deflection?
It's too easy to input the the wrong figures/units in those free calculators, so I I decided to implement the calcs for point load deflection of some standard sized beams here: https://github.com/bagofjuice/engineeringcalcs/blo...
It should be easier to check the numbers assuming you're looking for exactly the same calcs as me. Hope it's of help to someone.
(some ability to update/run javascript/typescript required).
It should be easier to check the numbers assuming you're looking for exactly the same calcs as me. Hope it's of help to someone.
(some ability to update/run javascript/typescript required).
Edited by bagofjuice on Tuesday 13th November 22:48
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