Once you start considering trolleys, mobile cranes and the like you need consider:
1) Is there room to manoeuvre the thing safely to use it, and to park it out of the way?
2) Will it move the object to the intended location? I.e. will it let you lift and control the load?
3) Is the heaviest object – e.g. a large lathe chuck or a rotary-table, so heavy you really need motors or hydraulic drives? Will a chain-block or block-and-tackle be as effective?
4) If it suits the lathe does it also suit the milling-machine or an assembly-bench, or for ancillary tasks like holding the outer ends of long workpieces on a sawing-machine or bench-drill? Even if the main axes of the machines are at angles to each other?
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Answers;
1) A straight lift-table won’t so you need some form of ramp or bridge to move the load on. A garage type engine-hoist won’t – these must be among the most ungainly, awkward contraptions invented!
2) Such as the lathe spindle and the milling-machine table and any other point in the workshop.
3) How often do you need lift an entire machine-tool? If you need move it, there are usually simpler and safer ways. If you can lift the object by hand but it is of borderline mass, you don’t need a JCB to lift it. For heavy machine-tool fittings a 3 or 4 : 1 mechanical advantage for the lift should be ample as long as you can also move and control the load.
(Bear in mind simple block-and-tackle needs some form of ratchet-clamp or belaying-pin so you can lock the load, as it does not have any intrinsic holdfast arrangement.)
4) Really expands on Q2.
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I equipped my workshop – which is admittedly cramped – with a simple travelling-crane.
The crab holds an ordinary chain-block hung on a bar itself intended alternatively as a potential fixed axle for the top sheaves of a multi-fall block-and-tackle. One reason for this option is to avoid chains banging against delicate surfaces like fittings and paintwork on a miniature engine.
It reaches most of the workshop area, with a little manipulating of the load occasionally where close to the travel limits or a partial obstruction like the head of the milling-machine.
It can place the hefty chucks for the Harrison L5 lathe almost to the mandrel nose.
As a “helping-hand” on the band-saw or bench-drill, it is ideal. Indeed, its first ever task was supporting a two-foot square of thick steel plate for drilling (for a special bench-top)!
All “hand-raulic” – no over-thinking about motors, bits of studding in drill-chucks or hydraulics. Maintenance is just an occasional spot of oil on the axle journals and horn-plates.
No floor area lost to great lumps of trolley.
(The long-travel axles run in cast-iron blocks between steel horns, controlled by rubber pads. This modicum of suspension keeps all four wheels in contact with the rails, on what is effectively a six-foot gauge bogie.)