Workshop Crane Construction

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Workshop Crane Construction

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  • #760085
    Pero
    Participant
      @pero

      Potentially a cross-topic query/discussion!

      For some time, as I get older and weaker, I have been looking at options for a small workshop crane for lifting chucks and machining accessories onto my lathe and mill without finding anything commercial that fits the bill. To explain a little of why I am doing this, the weight of the heaviest chuck on my lathe is around 40 kg. I can almost lift it but placing it on the lathe and fitting it is way beyond me. Other lathe accessories and accessories for the mill likewise. The idea is to be able to lift the object, extend it over the lathe bed/mill table and lower it gently onto the surface without causing damage to either. It will be fitted to a mobile trolley to service 3 or 4 machines. It will be stable in its most likely used format but extendable supports may be fitted if required.

      I have now moved on to designing/planning for a self-build and have come up with three construction alternatives for a small scale crane with a safe lifting capacity of 100 kg.

      In each case the requirement is for a lifting and extending jib plus a winch.

      Option 1 is for an all-hydraulic system however the cost of hydraulic winches is very high and those I did find were all high speed so not satisfactory. A small electric winch will therefore be used in all cases. The hydraulic actuators for the jib functions were reasonable but also require a hydraulic pump and reservoir, valve system and lots of high pressure hoses and hydraulic fluid. Altogether not exactly encouraging/desirable.

      Option 2 would be an electric winch and two self-contained electric-hydraulic actuators. These are self-contained units with each having a small electrically driven pump powering a hydraulically driven piston (actuator). No need for a separate pump and reservoir, valve manifold or hoses.

      Option 3 is the electric winch coupled with two electric linear actuators, i.e. no hydraulics involved.

      The cost for the components for each system would be roughly comparable. I think the precision of control would be greatest with the electric linear actuators but have no experience with these so would welcome any thoughts or comments.

      I know this topic has come up a number of times but don’t remember anyone planning to go to quite these extremes before so all thoughts and comments on the project would be welcomed.

      I have previously considered an overhead system but as the lathe and mill are at right angles have abandoned this option.

      Thanks for reading.

      Pero

       

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      #760133
      Stuart Smith 5
      Participant
        @stuartsmith5

        You don’t say what your budget is, but a used mobility scooter hoist for a car may be ok.

        There are various designs but one with 2 linear actuators would give up and down and rotary motion.
        Some have a built in winch.

        They have a handset to control the movement. Lifting capacity varies but you can get ones with over 100kg capacity. Obviously depends on how it is mounted. I am thinking of doing the same as you.

        Stuart

        #760139
        Bazyle
        Participant
          @bazyle

          Another possibility is an hydraulic lift table. Put chuck on shelf on little wheeled carriage, roll onto table , lift to lathe bed, lower flap between table and bed to roll off chuck. Arrange that wheeled carriage to be at correct height to screw onto nose.
          If there is room in your shed for a bigger hydraulic table that could also have a small crane arm added with the table providing the vertical movement. A sub table might be made using roller drawer slides to move things off storage onto table then onto mill.

          Also instead of hydraulics and electric winches some smaller movements can be achieved with screwed rod turned by a battery drill, or perhaps permanently connect a old mains drill as there are plenty around now we have all gone battery.

          #760140
          Clive Foster
          Participant
            @clivefoster55965

            Pero

            I agree with Stuart that a mobility scooter hoist could work well for this job. Something I’ve looked into up to the obtain parts and back of envelope design stage.

            My Plan A is to bolt a mobility scooter loading crane of the type intended to be fixed into an hatchback or estate car to a good quality rolling service cart.

            The service cart I have is the 6 drawer version found under Snap-On / Bluepoint brands. It is reassuringly sturdy. I imagine other breeds could be up to the task but Snap-On have a well deserved reputation for making strong stuff. (My big Snap-On rolling mechanics toolbox has load ratings per drawer approaching that of a whole similar sized one from some other suppliers.) Many years ago I bought a similar service cart from a budget supplier, Northern Tools perhaps, that is surprisingly rigid when bolted up but unlikely to be up to handling the offset stresses of a crane.

            I spent maybe £300 – £350 for the Snap-On cart and crane via FaceBook Marketplace and E-Bay.

            Preliminary plan is to fix a short length of scaffold pole to one corner of the cart as a base for the crane pivot device on the existing mounts. Alternative is to mount the crane on a long shaft dropping down into the scaffold pole. At this stage I’m unsure about doing permanent integration, which would be neater, as welded on brackets would be needed.

            These cranes have an inherently limited lift range. Probably not an issue if shifting from storage shelf to machine. Even less so if you store the chucks and other things on the cart. If you choose to do on cart storage probably better to have a cart with the deep top compartment and sliding lid rather than the shallow compartment and hinge up lid that mine has. A strong ratchet strap seems good way to get more, adjustable, lift range.

            Disadvantage of the mobility scooter lift is that it needs some sort of 12 volt power supply. Car battery would be ideal and help balance things but seems expensive given the limited use. I have an old but still good one on the bench for various jobs so no issue for me.

            In the beginning I was going to engineer my own version using a feed screw driven by my 18volt Makita battery drill to drive the lift. Then the penny dropped that I was basically re-inventing the wheel. I imagine an inexpensive hydraulic cylinder and hand pump would work if you chose to engineer your own. Something like the ram and pump used in body repair kits from the likes of Machine Mart for £120 (ish) :-

            https://www.machinemart.co.uk/p/clarke-cs10prh-10-tonne-pump-ram-and-hose/

            perhaps but these seem vastly over powered for this job.

            Clive

            #760145
            Nicholas Farr
            Participant
              @nicholasfarr14254

              Hi, this is what I did in my garage, but it was in the plan during the building of my garage, and all the material was free. It has had 300kg on it, without any issues.

              Test Lift

              Regards Nick.

              #760193
              V8Eng
              Participant
                @v8eng

                I find a folding engine crane works for me but appreciate space and manoeuvrability etc can be an issue with one of those for many places.

                #760206
                larry phelan 1
                Participant
                  @larryphelan1

                  What,s wrong with a simple lifting platform using a trailer hand winch ?

                  I built one some years ago [not my plan, just a copy ] and it does everything I require.

                  Simple and cheap to make and serves as a “place to put things out of my hand ”

                  It can be brought right up to the lathe bed or mill table height and if your chucks are arranged to sit on “mother blocks “, they will end up at the correct height every time.

                  Heavy mill vise ?, no problem ! Broken foot ?  No way !

                  BTW, I think it was Dave Fenner who made the one I copied

                  Just a thought !

                  #760234
                  Nick Wheeler
                  Participant
                    @nickwheeler

                    As above, Pero’s low weight requirements are easily covered with a basic, cheap, hand-operated winch with a safety brake. Something like THIS . While not necessarily intended for lifting, I’ve seen them used that way as they crank in both directions and the weight rating is five times the requirement.

                    Using hydraulics or electrics, let alone a combination of both seems like a huge complication(and expense) for such a simple task.

                    #760239
                    Clive Foster
                    Participant
                      @clivefoster55965
                      On larry phelan 1 Said:

                      What,s wrong with a simple lifting platform using a trailer hand winch ?

                      Nothing at all. Purely a horses for courses question.

                      Lift table is great for sliding transfers from bench or shelf to machine but not so good for anything involving up’n over or pick up from the floor which generally leaves you with some hand effort.

                      Crane is better for direct pick up and anything involving swing over. But a simp-le mobile crane has issues with the legs getting in the way.

                      Considered a lift table to make life easier with the vices, rotary tables and dividing head that i use with my Bridgeport. Eventually decided the cost and space it would take up wasn’t justifiable for something that couldn’t help with the big chucks, and sometimes big jobs, for my large P&W Model B lathe.

                      Given a clean sheet of paper the best option for me would be a roll cart with integrated crane holding all my heavy items. I have too much heavy gear to get away with a single compartment on top without making the thing impractically big. So I need to figure a way to give the crane access to two lower layers of drawer style compartment without then thing overbalancing or breaking the drawer slides. Using an off teh shelf cart like the Snap-On / Bluepoint ones means that only some of teh behave gear can go on the cart. The rest will have to be picked off shelves.

                      Clive

                       

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