It ended up being an IPE 100 beam that is now lifted. 9m and not 11 
However, I calculated the expansion and found that the beam will move +/- 4cm assuming that +5 degrees is the equilibrium temperature and that it can be -20 and +30 (i.e., a dT of 25 degrees).
This seems like something to consider when fastening it, right? That it is allowed to move, for example... it becomes a bit tricky but
edit: Calculated with 18u in expansion coefficient, maybe it should be 12 but still.
However, I calculated the expansion and found that the beam will move +/- 4cm assuming that +5 degrees is the equilibrium temperature and that it can be -20 and +30 (i.e., a dT of 25 degrees).
This seems like something to consider when fastening it, right? That it is allowed to move, for example... it becomes a bit tricky but
edit: Calculated with 18u in expansion coefficient, maybe it should be 12 but still.
Not sure exactly how you calculated there.... the coefficient of linear expansion is approximately 0.00001 mm/m/degree for steel and you had a 9 m long beam and a 50 degree temperature difference (max to min). With this, I get a maximum movement between max and min of 4.5 mm, i.e. clearly less than what your calculation states.
Or if we are to be more precise, the linear expansion coefficient is 0.0000122 for steel with a carbon content of 0.1% and 0.0000115 for a carbon content of 0.85%.
But even if we take the maximum value, the total movement is no more than 5.4 mm.
It's more than a factor of 10 because you write +/- before your movement.
But even if we take the maximum value, the total movement is no more than 5.4 mm.
It's more than a factor of 10 because you write +/- before your movement.
After using the crane a bit, I'm fairly satisfied, but it could always be better.
The trolley is Jula's variant and it works well as long as you lift something that's perfectly aligned with the beam and pull straight.
However, with the slightest uneven load, it veers into the beam and becomes sluggish...
Can someone recommend a trolley that has wheels to keep it aligned sideways? The alternative would be to create my own wheel set to fix this but...
The trolley is Jula's variant and it works well as long as you lift something that's perfectly aligned with the beam and pull straight.
However, with the slightest uneven load, it veers into the beam and becomes sluggish...
Can someone recommend a trolley that has wheels to keep it aligned sideways? The alternative would be to create my own wheel set to fix this but...
Know-It-All
· Västra götaland
· 10 920 posts
https://www.jula.se/catalog/bil-och-garage/garage/lyftdon/lyftblock/lopvagn-334013/
Is it that one?
If you have access to a welder, it's probably relatively easy to mount a couple of additional bearings on each side of the trolley, to keep it on track...
Is it that one?
If you have access to a welder, it's probably relatively easy to mount a couple of additional bearings on each side of the trolley, to keep it on track...