The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)

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mattinker:
Hi Andrew,

A tight corner! It's the endless making things to make things syndrome! Love it most of the time!

Cheers, Matthew

awemawson:
Well it helps to sleep on things :thumbup:

I've come up with what I think is probably a much better solution: The Beaver TC 20 has MASSIVE M30 lifting eye sockets in it's equally humongous base casting, two of which are just inside the sliding door. Using Pete's suggestion of a bi-fold davit arrangement, if I build off a substantial plate bolted to these two mounts I don't think there'll be too much problem with two point rather than three point mounting. OK the plate will have to sustain significant torque with the jib extended and 47 kg dangling on it - but hey they are M30

Now in my mind I have something like the hoists used to remove mobility scooters from the backs of cars - darn me I gave one away a few years back - but they will already have the suitable articulation pivots and linear actuators.

This way the whole shebang can be fitted and removed by just undoing two (admittedly large) bolts.

So the hunt is on for a redundant mobility hoist or other such thing so please keep your eyes skinned !

(Picture is of the sort of thing I'm looking for, sadly not one that I yet have!)

awemawson:
So this afternoon I made a 'proof of concept' wooden mock up to help me visualise the various lengths of arms and angles involved.

Just a fairly rough bit of carpentry - the final version will be welded together substantial chunks of steel with various reinforcing gussets.

. . .but it helps me see if it will work and I think that it will :thumbup:

awemawson:
Time to go from'proof of concept' to a working prototype, so I drew up the base plate in Autocad and prepared it on Sheetcam to cut on the CNC Plasma Cutter.

It was then that I realised none of my offcuts of 6 mm MS plate were big enough to cut the base, which is approximately 1 M x 150 mm. No problem, I have a stash of sheets in my container. Third one down in the layer was a full 1.5 M square, so a bit of huffing and puffing and the top two sheets were removed (6 mm plate is bally heavy to manhandle!) and I walked the chosen one to the door awaiting attention from the forklift. Plate grab suitably attached and I moved it to the welding shop, laying it on the pump up trolley. This lets me get it overhanging the plasma table, and a few more grunts and puff got it place.

I've cut the base plate with a rectangular hole to receive the fixed upright, so that I can weld both sides of the plate. I also cut four reinforcing fillets for this upright, but I fancy they may not be large enough. At least in the fore and aft direction I can put a much larger one perhaps

Picture shows bits temporarily held by magnets while I chew over ideas!

Pete.:

--- Quote from: awemawson on March 03, 2021, 11:20:12 AM ---So this afternoon I made a 'proof of concept' wooden mock up to help me visualise the various lengths of arms and angles involved.

Just a fairly rough bit of carpentry - the final version will be welded together substantial chunks of steel with various reinforcing gussets.

. . .but it helps me see if it will work and I think that it will :thumbup:

--- End quote ---

I must confess that I envisaged a horizontally-swinging bi-fold arm, rather than a luffing gib. Either would work just as well but with the horizontal arm you don't need anything to pivot on the post axis.

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