If all goes to schedule then by end of the week, on the slab in the first image, there will be an erected shed.
Who would have thought that such a simple thing could take so long in the planning and execution. It has been 2.5 years near enough; I engaged the certifier to work thru and attain the DA in November 2014.
Anyways a "shed in the flesh" is close; time to get real with what happens on the inside. Not all the space can go to my toys as the business will need some ... but I do plan to get a fair share.
I expect pretty quick I will shuffle all the big kit in and commence the game of tetris to find best slots for stuff.
High on my agenda is a Jib Crane. My thinking is that the Jib Crane would be best positioned at the intersection between the bays ... pretty much at the stool that is pointed to by the arrow in the first picture.
The shed is 8 meters wide x 12 meters long spread over 3 bays; so a Jib Crane with span of 4 meters does cover near two thirds of the area.
Plan is the base of the Mast will be bolted to the floor and the top of Mast to the roof joist that divides two bays. In this design the whole mast swivels.
My understanding is that the swivelling mast design also places the least stress on the building structure. Regardless, I am going to limit myself to 200kg max ... and could even go for less. The loads will essentially be chucks, dividing heads, milling vices and the like. Most of those are less than 30kg.
A straight Boom will sweep most of the area but will miss access to the shed corners by 1.5 meters; hence am open to considering the Hinged Boom style.
Hinged Boom Jib Cranes seem not to utilize the running gantry of other styles; instead have a fixed mounting point for the load at the end of the mechanism. This does mean that the load is effectively always at the end of the Boom; plus there are now twisting forces on the Boom.
Comments and guidance welcome.
Have not yet gotten a clear picture of the sizes of the materials required. Do have a couple of lengths of 150mm x 165mm W flange beam;
think that is the correct term as it has little flare where the plates join; they have 7mm plate thickness top and bottom and 10mm width in the joining plate.
Was thinking a deep groove roller bearing (say 40mm inside diameter) for the top of mast and a tapered roller bearing from 4WD (also about 40mm inside diameter) for the bottom of mast. That said, most of the commercial designs seem to use bronze bushes with a bronze thrust plate at the base. My concern with the taper roller at the base is that the Mast may "climb" up and out of the cup; I could put a longer shaft in to "catch" this should it occur; but if it is a risk then maybe the parallel shaft to bronze bearing is the better way to go.